934 lines
26 KiB
Markdown
934 lines
26 KiB
Markdown
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# Global configuration
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## Main section
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```toml
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# traefik.toml
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################################################################
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# Global configuration
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################################################################
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# Traefik logs file
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# If not defined, logs to stdout
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#
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# Optional
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#
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# traefikLogsFile = "log/traefik.log"
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# Access logs file
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#
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# Optional
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#
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# accessLogsFile = "log/access.log"
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# Log level
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#
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# Optional
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# Default: "ERROR"
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#
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# logLevel = "ERROR"
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# Backends throttle duration: minimum duration between 2 events from providers
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# before applying a new configuration. It avoids unnecessary reloads if multiples events
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# are sent in a short amount of time.
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#
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# Optional
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# Default: "2s"
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#
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# ProvidersThrottleDuration = "5s"
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# If non-zero, controls the maximum idle (keep-alive) to keep per-host. If zero, DefaultMaxIdleConnsPerHost is used.
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# If you encounter 'too many open files' errors, you can either change this value, or change `ulimit` value.
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#
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# Optional
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# Default: http.DefaultMaxIdleConnsPerHost
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#
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# MaxIdleConnsPerHost = 200
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# Entrypoints to be used by frontends that do not specify any entrypoint.
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# Each frontend can specify its own entrypoints.
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#
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# Optional
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# Default: ["http"]
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#
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# defaultEntryPoints = ["http", "https"]
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```
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## Entrypoints definition
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```toml
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# Entrypoints definition
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#
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# Optional
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# Default:
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# [entryPoints]
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# [entryPoints.http]
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# address = ":80"
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#
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# To redirect an http entrypoint to an https entrypoint (with SNI support):
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# [entryPoints]
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# [entryPoints.http]
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# address = ":80"
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# [entryPoints.http.redirect]
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# entryPoint = "https"
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# [entryPoints.https]
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# address = ":443"
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# [entryPoints.https.tls]
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# [[entryPoints.https.tls.certificates]]
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# CertFile = "integration/fixtures/https/snitest.com.cert"
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# KeyFile = "integration/fixtures/https/snitest.com.key"
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# [[entryPoints.https.tls.certificates]]
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# CertFile = "integration/fixtures/https/snitest.org.cert"
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# KeyFile = "integration/fixtures/https/snitest.org.key"
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#
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# To redirect an entrypoint rewriting the URL:
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# [entryPoints]
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# [entryPoints.http]
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# address = ":80"
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# [entryPoints.http.redirect]
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# regex = "^http://localhost/(.*)"
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# replacement = "http://mydomain/$1"
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[entryPoints]
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[entryPoints.http]
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address = ":80"
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```
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## Retry configuration
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```toml
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# Enable retry sending request if network error
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#
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# Optional
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#
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[retry]
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# Number of attempts
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#
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# Optional
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# Default: (number servers in backend) -1
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#
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# attempts = 3
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# Sets the maximum request body to be stored in memory in Mo
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#
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# Optional
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# Default: 2
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#
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# maxMem = 3
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```
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## ACME (Let's Encrypt) configuration
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```toml
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# Enable ACME (Let's Encrypt): automatic SSL
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#
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# Optional
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#
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[acme]
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# Email address used for registration
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#
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# Required
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#
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email = "test@traefik.io"
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# File used for certificates storage.
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# WARNING, if you use Traefik in Docker, don't forget to mount this file as a volume.
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#
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# Required
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#
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storageFile = "acme.json"
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# Entrypoint to proxy acme challenge to.
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# WARNING, must point to an entrypoint on port 443
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#
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# Required
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#
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entryPoint = "https"
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# Enable on demand certificate. This will request a certificate from Let's Encrypt during the first TLS handshake for a hostname that does not yet have a certificate.
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# WARNING, TLS handshakes will be slow when requesting a hostname certificate for the first time, this can leads to DoS attacks.
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# WARNING, Take note that Let's Encrypt have rate limiting: https://community.letsencrypt.org/t/quick-start-guide/1631
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#
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# Optional
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#
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# onDemand = true
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# CA server to use
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# Uncomment the line to run on the staging let's encrypt server
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# Leave comment to go to prod
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#
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# Optional
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#
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# caServer = "https://acme-staging.api.letsencrypt.org/directory"
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# Domains list
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# You can provide SANs (alternative domains) to each main domain
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# WARNING, Take note that Let's Encrypt have rate limiting: https://community.letsencrypt.org/t/quick-start-guide/1631
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# Each domain & SANs will lead to a certificate request.
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#
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# [[acme.domains]]
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# main = "local1.com"
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# sans = ["test1.local1.com", "test2.local1.com"]
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# [[acme.domains]]
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# main = "local2.com"
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# sans = ["test1.local2.com", "test2x.local2.com"]
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# [[acme.domains]]
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# main = "local3.com"
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# [[acme.domains]]
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# main = "local4.com"
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[[acme.domains]]
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main = "local1.com"
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sans = ["test1.local1.com", "test2.local1.com"]
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[[acme.domains]]
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main = "local3.com"
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[[acme.domains]]
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main = "local4.com"
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```
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# Configuration backends
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## File backend
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Like any other reverse proxy, Træfɪk can be configured with a file. You have two choices:
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- simply add your configuration at the end of the global configuration file `traefik.toml` :
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```toml
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# traefik.toml
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logLevel = "DEBUG"
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defaultEntryPoints = ["http", "https"]
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[entryPoints]
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[entryPoints.http]
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address = ":80"
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[entryPoints.http.redirect]
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entryPoint = "https"
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[entryPoints.https]
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address = ":443"
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[entryPoints.https.tls]
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[[entryPoints.https.tls.certificates]]
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CertFile = "integration/fixtures/https/snitest.com.cert"
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KeyFile = "integration/fixtures/https/snitest.com.key"
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[[entryPoints.https.tls.certificates]]
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CertFile = "integration/fixtures/https/snitest.org.cert"
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KeyFile = "integration/fixtures/https/snitest.org.key"
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[file]
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# rules
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[backends]
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[backends.backend1]
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[backends.backend1.circuitbreaker]
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expression = "NetworkErrorRatio() > 0.5"
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[backends.backend1.servers.server1]
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url = "http://172.17.0.2:80"
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weight = 10
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[backends.backend1.servers.server2]
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url = "http://172.17.0.3:80"
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weight = 1
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[backends.backend2]
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[backends.backend1.maxconn]
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amount = 10
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extractorfunc = "request.host"
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[backends.backend2.LoadBalancer]
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method = "drr"
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[backends.backend2.servers.server1]
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url = "http://172.17.0.4:80"
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weight = 1
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[backends.backend2.servers.server2]
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url = "http://172.17.0.5:80"
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weight = 2
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[frontends]
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[frontends.frontend1]
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backend = "backend2"
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[frontends.frontend1.routes.test_1]
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rule = "Host:test.localhost"
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[frontends.frontend2]
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backend = "backend1"
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passHostHeader = true
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entrypoints = ["https"] # overrides defaultEntryPoints
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[frontends.frontend2.routes.test_1]
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rule = "Host:{subdomain:[a-z]+}.localhost"
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[frontends.frontend3]
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entrypoints = ["http", "https"] # overrides defaultEntryPoints
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backend = "backend2"
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rule = "Path:/test"
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```
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- or put your rules in a separate file, for example `rules.toml`:
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```toml
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# traefik.toml
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logLevel = "DEBUG"
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[entryPoints]
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[entryPoints.http]
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address = ":80"
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[entryPoints.http.redirect]
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entryPoint = "https"
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[entryPoints.https]
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address = ":443"
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[entryPoints.https.tls]
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[[entryPoints.https.tls.certificates]]
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CertFile = "integration/fixtures/https/snitest.com.cert"
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KeyFile = "integration/fixtures/https/snitest.com.key"
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[[entryPoints.https.tls.certificates]]
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CertFile = "integration/fixtures/https/snitest.org.cert"
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KeyFile = "integration/fixtures/https/snitest.org.key"
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[file]
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filename = "rules.toml"
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```
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```toml
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# rules.toml
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[backends]
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[backends.backend1]
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[backends.backend1.circuitbreaker]
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expression = "NetworkErrorRatio() > 0.5"
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[backends.backend1.servers.server1]
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url = "http://172.17.0.2:80"
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weight = 10
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[backends.backend1.servers.server2]
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url = "http://172.17.0.3:80"
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weight = 1
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[backends.backend2]
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[backends.backend1.maxconn]
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amount = 10
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extractorfunc = "request.host"
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[backends.backend2.LoadBalancer]
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method = "drr"
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[backends.backend2.servers.server1]
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url = "http://172.17.0.4:80"
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weight = 1
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[backends.backend2.servers.server2]
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url = "http://172.17.0.5:80"
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weight = 2
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[frontends]
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[frontends.frontend1]
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backend = "backend2"
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[frontends.frontend1.routes.test_1]
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rule = "Host:test.localhost"
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[frontends.frontend2]
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backend = "backend1"
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passHostHeader = true
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entrypoints = ["https"] # overrides defaultEntryPoints
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[frontends.frontend2.routes.test_1]
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rule = "Host:{subdomain:[a-z]+}.localhost"
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[frontends.frontend3]
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entrypoints = ["http", "https"] # overrides defaultEntryPoints
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backend = "backend2"
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rule = "Path:/test"
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```
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If you want Træfɪk to watch file changes automatically, just add:
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```toml
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[file]
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watch = true
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```
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## API backend
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Træfik can be configured using a restful api.
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To enable it:
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```toml
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[web]
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address = ":8080"
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# SSL certificate and key used
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#
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# Optional
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#
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# CertFile = "traefik.crt"
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# KeyFile = "traefik.key"
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#
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# Set REST API to read-only mode
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#
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# Optional
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# ReadOnly = false
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```
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- `/`: provides a simple HTML frontend of Træfik
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- `/health`: `GET` json metrics
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```sh
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$ curl -s "http://localhost:8080/health" | jq .
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{
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// Træfɪk PID
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"pid": 2458,
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// Træfɪk server uptime (formated time)
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"uptime": "39m6.885931127s",
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// Træfɪk server uptime in seconds
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"uptime_sec": 2346.885931127,
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// current server date
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"time": "2015-10-07 18:32:24.362238909 +0200 CEST",
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// current server date in seconds
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"unixtime": 1444235544,
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// count HTTP response status code in realtime
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"status_code_count": {
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"502": 1
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},
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// count HTTP response status code since Træfɪk started
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"total_status_code_count": {
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"200": 7,
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"404": 21,
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"502": 13
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},
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// count HTTP response
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"count": 1,
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// count HTTP response
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"total_count": 41,
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// sum of all response time (formated time)
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"total_response_time": "35.456865605s",
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// sum of all response time in seconds
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"total_response_time_sec": 35.456865605,
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// average response time (formated time)
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"average_response_time": "864.8016ms",
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// average response time in seconds
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"average_response_time_sec": 0.8648016000000001
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}
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```
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- `/api`: `GET` configuration for all providers
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```sh
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$ curl -s "http://localhost:8080/api" | jq .
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{
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"file": {
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"frontends": {
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"frontend2": {
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"routes": {
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"test_2": {
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"rule": "Path:/test"
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}
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},
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"backend": "backend1"
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},
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"frontend1": {
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"routes": {
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"test_1": {
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"rule": "Host:test.localhost"
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}
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},
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"backend": "backend2"
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}
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},
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"backends": {
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"backend2": {
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"loadBalancer": {
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"method": "drr"
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},
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"servers": {
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"server2": {
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"weight": 2,
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"URL": "http://172.17.0.5:80"
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},
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"server1": {
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"weight": 1,
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"url": "http://172.17.0.4:80"
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}
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}
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},
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"backend1": {
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"loadBalancer": {
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"method": "wrr"
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},
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"circuitBreaker": {
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"expression": "NetworkErrorRatio() > 0.5"
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},
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"servers": {
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"server2": {
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"weight": 1,
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"url": "http://172.17.0.3:80"
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},
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"server1": {
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"weight": 10,
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"url": "http://172.17.0.2:80"
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}
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}
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}
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}
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}
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}
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```
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- `/api/providers`: `GET` providers
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- `/api/providers/{provider}`: `GET` or `PUT` provider
|
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- `/api/providers/{provider}/backends`: `GET` backends
|
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- `/api/providers/{provider}/backends/{backend}`: `GET` a backend
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- `/api/providers/{provider}/backends/{backend}/servers`: `GET` servers in a backend
|
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- `/api/providers/{provider}/backends/{backend}/servers/{server}`: `GET` a server in a backend
|
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- `/api/providers/{provider}/frontends`: `GET` frontends
|
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- `/api/providers/{provider}/frontends/{frontend}`: `GET` a frontend
|
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- `/api/providers/{provider}/frontends/{frontend}/routes`: `GET` routes in a frontend
|
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- `/api/providers/{provider}/frontends/{frontend}/routes/{route}`: `GET` a route in a frontend
|
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|
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## Docker backend
|
||
|
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Træfɪk can be configured to use Docker as a backend configuration:
|
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|
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```toml
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################################################################
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# Docker configuration backend
|
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################################################################
|
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|
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# Enable Docker configuration backend
|
||
#
|
||
# Optional
|
||
#
|
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[docker]
|
||
|
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# Docker server endpoint. Can be a tcp or a unix socket endpoint.
|
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#
|
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# Required
|
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#
|
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endpoint = "unix:///var/run/docker.sock"
|
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|
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# Default domain used.
|
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# Can be overridden by setting the "traefik.domain" label on a container.
|
||
#
|
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# Required
|
||
#
|
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domain = "docker.localhost"
|
||
|
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# Enable watch docker changes
|
||
#
|
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# Optional
|
||
#
|
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watch = true
|
||
|
||
# Override default configuration template. For advanced users :)
|
||
#
|
||
# Optional
|
||
#
|
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# filename = "docker.tmpl"
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||
|
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# Enable docker TLS connection
|
||
#
|
||
# [docker.tls]
|
||
# ca = "/etc/ssl/ca.crt"
|
||
# cert = "/etc/ssl/docker.crt"
|
||
# key = "/etc/ssl/docker.key"
|
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# insecureskipverify = true
|
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```
|
||
|
||
Labels can be used on containers to override default behaviour:
|
||
|
||
- `traefik.backend=foo`: assign the container to `foo` backend
|
||
- `traefik.port=80`: register this port. Useful when the container exposes multiples ports.
|
||
- `traefik.protocol=https`: override the default `http` protocol
|
||
- `traefik.weight=10`: assign this weight to the container
|
||
- `traefik.enable=false`: disable this container in Træfɪk
|
||
- `traefik.frontend.rule=Host:test.traefik.io`: override the default frontend rule (Default: `Host:{containerName}.{domain}`).
|
||
- `traefik.frontend.passHostHeader=true`: forward client `Host` header to the backend.
|
||
- `traefik.frontend.entryPoints=http,https`: assign this frontend to entry points `http` and `https`. Overrides `defaultEntryPoints`.
|
||
* `traefik.domain=traefik.localhost`: override the default domain
|
||
|
||
|
||
## Marathon backend
|
||
|
||
Træfɪk can be configured to use Marathon as a backend configuration:
|
||
|
||
|
||
```toml
|
||
################################################################
|
||
# Mesos/Marathon configuration backend
|
||
################################################################
|
||
|
||
# Enable Marathon configuration backend
|
||
#
|
||
# Optional
|
||
#
|
||
[marathon]
|
||
|
||
# Marathon server endpoint.
|
||
# You can also specify multiple endpoint for Marathon:
|
||
# endpoint := "http://10.241.1.71:8080,10.241.1.72:8080,10.241.1.73:8080"
|
||
#
|
||
# Required
|
||
#
|
||
endpoint = "http://127.0.0.1:8080"
|
||
|
||
# Enable watch Marathon changes
|
||
#
|
||
# Optional
|
||
#
|
||
watch = true
|
||
|
||
# Default domain used.
|
||
# Can be overridden by setting the "traefik.domain" label on an application.
|
||
#
|
||
# Required
|
||
#
|
||
domain = "marathon.localhost"
|
||
|
||
# Override default configuration template. For advanced users :)
|
||
#
|
||
# Optional
|
||
#
|
||
# filename = "marathon.tmpl"
|
||
|
||
# Expose Marathon apps by default in traefik
|
||
#
|
||
# Optional
|
||
# Default: false
|
||
#
|
||
# ExposedByDefault = true
|
||
|
||
# Enable Marathon basic authentication
|
||
#
|
||
# Optional
|
||
#
|
||
# [marathon.basic]
|
||
# httpBasicAuthUser = "foo"
|
||
# httpBasicPassword = "bar"
|
||
|
||
# TLS client configuration. https://golang.org/pkg/crypto/tls/#Config
|
||
#
|
||
# Optional
|
||
#
|
||
# [marathon.TLS]
|
||
# InsecureSkipVerify = true
|
||
```
|
||
|
||
Labels can be used on containers to override default behaviour:
|
||
|
||
- `traefik.backend=foo`: assign the application to `foo` backend
|
||
- `traefik.portIndex=1`: register port by index in the application's ports array. Useful when the application exposes multiple ports.
|
||
- `traefik.port=80`: register the explicit application port value. Cannot be used alongside `traefik.portIndex`.
|
||
- `traefik.protocol=https`: override the default `http` protocol
|
||
- `traefik.weight=10`: assign this weight to the application
|
||
- `traefik.enable=false`: disable this application in Træfɪk
|
||
- `traefik.frontend.rule=Host:test.traefik.io`: override the default frontend rule (Default: `Host:{containerName}.{domain}`).
|
||
- `traefik.frontend.passHostHeader=true`: forward client `Host` header to the backend.
|
||
- `traefik.frontend.entryPoints=http,https`: assign this frontend to entry points `http` and `https`. Overrides `defaultEntryPoints`.
|
||
* `traefik.domain=traefik.localhost`: override the default domain
|
||
|
||
## Consul backend
|
||
|
||
Træfɪk can be configured to use Consul as a backend configuration:
|
||
|
||
```toml
|
||
################################################################
|
||
# Consul KV configuration backend
|
||
################################################################
|
||
|
||
# Enable Consul KV configuration backend
|
||
#
|
||
# Optional
|
||
#
|
||
[consul]
|
||
|
||
# Consul server endpoint
|
||
#
|
||
# Required
|
||
#
|
||
endpoint = "127.0.0.1:8500"
|
||
|
||
# Enable watch Consul changes
|
||
#
|
||
# Optional
|
||
#
|
||
watch = true
|
||
|
||
# Prefix used for KV store.
|
||
#
|
||
# Optional
|
||
#
|
||
prefix = "traefik"
|
||
|
||
# Override default configuration template. For advanced users :)
|
||
#
|
||
# Optional
|
||
#
|
||
# filename = "consul.tmpl"
|
||
|
||
# Enable consul TLS connection
|
||
#
|
||
# Optional
|
||
#
|
||
# [consul.tls]
|
||
# ca = "/etc/ssl/ca.crt"
|
||
# cert = "/etc/ssl/consul.crt"
|
||
# key = "/etc/ssl/consul.key"
|
||
# insecureskipverify = true
|
||
```
|
||
|
||
Please refer to the [Key Value storage structure](#key-value-storage-structure) section to get documentation en traefik KV structure.
|
||
|
||
## Consul catalog backend
|
||
|
||
Træfɪk can be configured to use service discovery catalog of Consul as a backend configuration:
|
||
|
||
```toml
|
||
################################################################
|
||
# Consul Catalog configuration backend
|
||
################################################################
|
||
|
||
# Enable Consul Catalog configuration backend
|
||
#
|
||
# Optional
|
||
#
|
||
[consulCatalog]
|
||
|
||
# Consul server endpoint
|
||
#
|
||
# Required
|
||
#
|
||
endpoint = "127.0.0.1:8500"
|
||
|
||
# Default domain used.
|
||
#
|
||
# Optional
|
||
#
|
||
domain = "consul.localhost"
|
||
|
||
# Prefix for Consul catalog tags
|
||
#
|
||
# Optional
|
||
#
|
||
prefix = "traefik"
|
||
```
|
||
|
||
This backend will create routes matching on hostname based on the service name
|
||
used in consul.
|
||
|
||
Additional settings can be defined using Consul Catalog tags:
|
||
|
||
- ```traefik.enable=false```: disable this container in Træfɪk
|
||
- ```traefik.protocol=https```: override the default `http` protocol
|
||
- ```traefik.backend.weight=10```: assign this weight to the container
|
||
- ```traefik.backend.circuitbreaker=NetworkErrorRatio() > 0.5```
|
||
- ```traefik.backend.loadbalancer=drr```: override the default load balancing mode
|
||
- ```traefik.frontend.rule=Host:test.traefik.io```: override the default frontend rule (Default: `Host:{containerName}.{domain}`).
|
||
- ```traefik.frontend.passHostHeader=true```: forward client `Host` header to the backend.
|
||
- ```traefik.frontend.entryPoints=http,https```: assign this frontend to entry points `http` and `https`. Overrides `defaultEntryPoints`.
|
||
|
||
## Etcd backend
|
||
|
||
Træfɪk can be configured to use Etcd as a backend configuration:
|
||
|
||
```toml
|
||
################################################################
|
||
# Etcd configuration backend
|
||
################################################################
|
||
|
||
# Enable Etcd configuration backend
|
||
#
|
||
# Optional
|
||
#
|
||
[etcd]
|
||
|
||
# Etcd server endpoint
|
||
#
|
||
# Required
|
||
#
|
||
endpoint = "127.0.0.1:4001"
|
||
|
||
# Enable watch Etcd changes
|
||
#
|
||
# Optional
|
||
#
|
||
watch = true
|
||
|
||
# Prefix used for KV store.
|
||
#
|
||
# Optional
|
||
#
|
||
prefix = "/traefik"
|
||
|
||
# Override default configuration template. For advanced users :)
|
||
#
|
||
# Optional
|
||
#
|
||
# filename = "etcd.tmpl"
|
||
|
||
# Enable etcd TLS connection
|
||
#
|
||
# Optional
|
||
#
|
||
# [etcd.tls]
|
||
# ca = "/etc/ssl/ca.crt"
|
||
# cert = "/etc/ssl/etcd.crt"
|
||
# key = "/etc/ssl/etcd.key"
|
||
# insecureskipverify = true
|
||
```
|
||
|
||
Please refer to the [Key Value storage structure](#key-value-storage-structure) section to get documentation en traefik KV structure.
|
||
|
||
|
||
## Zookeeper backend
|
||
|
||
Træfɪk can be configured to use Zookeeper as a backend configuration:
|
||
|
||
```toml
|
||
################################################################
|
||
# Zookeeper configuration backend
|
||
################################################################
|
||
|
||
# Enable Zookeeperconfiguration backend
|
||
#
|
||
# Optional
|
||
#
|
||
[zookeeper]
|
||
|
||
# Zookeeper server endpoint
|
||
#
|
||
# Required
|
||
#
|
||
endpoint = "127.0.0.1:2181"
|
||
|
||
# Enable watch Zookeeper changes
|
||
#
|
||
# Optional
|
||
#
|
||
watch = true
|
||
|
||
# Prefix used for KV store.
|
||
#
|
||
# Optional
|
||
#
|
||
prefix = "/traefik"
|
||
|
||
# Override default configuration template. For advanced users :)
|
||
#
|
||
# Optional
|
||
#
|
||
# filename = "zookeeper.tmpl"
|
||
```
|
||
|
||
Please refer to the [Key Value storage structure](#key-value-storage-structure) section to get documentation en traefik KV structure.
|
||
|
||
## BoltDB backend
|
||
|
||
Træfɪk can be configured to use BoltDB as a backend configuration:
|
||
|
||
```toml
|
||
################################################################
|
||
# BoltDB configuration backend
|
||
################################################################
|
||
|
||
# Enable BoltDB configuration backend
|
||
#
|
||
# Optional
|
||
#
|
||
[boltdb]
|
||
|
||
# BoltDB file
|
||
#
|
||
# Required
|
||
#
|
||
endpoint = "/my.db"
|
||
|
||
# Enable watch BoltDB changes
|
||
#
|
||
# Optional
|
||
#
|
||
watch = true
|
||
|
||
# Prefix used for KV store.
|
||
#
|
||
# Optional
|
||
#
|
||
prefix = "/traefik"
|
||
|
||
# Override default configuration template. For advanced users :)
|
||
#
|
||
# Optional
|
||
#
|
||
# filename = "boltdb.tmpl"
|
||
```
|
||
|
||
Please refer to the [Key Value storage structure](#key-value-storage-structure) section to get documentation en traefik KV structure.
|
||
|
||
## Key-value storage structure
|
||
|
||
The Keys-Values structure should look (using `prefix = "/traefik"`):
|
||
|
||
- backend 1
|
||
|
||
| Key | Value |
|
||
|--------------------------------------------------------|-----------------------------|
|
||
| `/traefik/backends/backend1/circuitbreaker/expression` | `NetworkErrorRatio() > 0.5` |
|
||
| `/traefik/backends/backend1/servers/server1/url` | `http://172.17.0.2:80` |
|
||
| `/traefik/backends/backend1/servers/server1/weight` | `10` |
|
||
| `/traefik/backends/backend1/servers/server2/url` | `http://172.17.0.3:80` |
|
||
| `/traefik/backends/backend1/servers/server2/weight` | `1` |
|
||
|
||
- backend 2
|
||
|
||
| Key | Value |
|
||
|-----------------------------------------------------|------------------------|
|
||
| `/traefik/backends/backend2/maxconn/amount` | `10` |
|
||
| `/traefik/backends/backend2/maxconn/extractorfunc` | `request.host` |
|
||
| `/traefik/backends/backend2/loadbalancer/method` | `drr` |
|
||
| `/traefik/backends/backend2/servers/server1/url` | `http://172.17.0.4:80` |
|
||
| `/traefik/backends/backend2/servers/server1/weight` | `1` |
|
||
| `/traefik/backends/backend2/servers/server2/url` | `http://172.17.0.5:80` |
|
||
| `/traefik/backends/backend2/servers/server2/weight` | `2` |
|
||
|
||
- frontend 1
|
||
|
||
| Key | Value |
|
||
|---------------------------------------------------|-----------------------|
|
||
| `/traefik/frontends/frontend1/backend` | `backend2` |
|
||
| `/traefik/frontends/frontend1/routes/test_1/rule` | `Host:test.localhost` |
|
||
|
||
- frontend 2
|
||
|
||
| Key | Value |
|
||
|----------------------------------------------------|--------------|
|
||
| `/traefik/frontends/frontend2/backend` | `backend1` |
|
||
| `/traefik/frontends/frontend2/passHostHeader` | `true` |
|
||
| `/traefik/frontends/frontend2/entrypoints` | `http,https` |
|
||
| `/traefik/frontends/frontend2/routes/test_2/rule` | `Path:/test` |
|
||
|
||
## Atomic configuration changes
|
||
|
||
The [Etcd](https://github.com/coreos/etcd/issues/860) and [Consul](https://github.com/hashicorp/consul/issues/886) backends do not support updating multiple keys atomically. As a result, it may be possible for Træfɪk to read an intermediate configuration state despite judicious use of the `--providersThrottleDuration` flag. To solve this problem, Træfɪk supports a special key called `/traefik/alias`. If set, Træfɪk use the value as an alternative key prefix.
|
||
|
||
Given the key structure below, Træfɪk will use the `http://172.17.0.2:80` as its only backend (frontend keys have been omitted for brevity).
|
||
|
||
| Key | Value |
|
||
|-------------------------------------------------------------------------|-----------------------------|
|
||
| `/traefik/alias` | `/traefik_configurations/1` |
|
||
| `/traefik_configurations/1/backends/backend1/servers/server1/url` | `http://172.17.0.2:80` |
|
||
| `/traefik_configurations/1/backends/backend1/servers/server1/weight` | `10` |
|
||
|
||
When an atomic configuration change is required, you may write a new configuration at an alternative prefix. Here, although the `/traefik_configurations/2/...` keys have been set, the old configuration is still active because the `/traefik/alias` key still points to `/traefik_configurations/1`:
|
||
|
||
| Key | Value |
|
||
|-------------------------------------------------------------------------|-----------------------------|
|
||
| `/traefik/alias` | `/traefik_configurations/1` |
|
||
| `/traefik_configurations/1/backends/backend1/servers/server1/url` | `http://172.17.0.2:80` |
|
||
| `/traefik_configurations/1/backends/backend1/servers/server1/weight` | `10` |
|
||
| `/traefik_configurations/2/backends/backend1/servers/server1/url` | `http://172.17.0.2:80` |
|
||
| `/traefik_configurations/2/backends/backend1/servers/server1/weight` | `5` |
|
||
| `/traefik_configurations/2/backends/backend1/servers/server2/url` | `http://172.17.0.3:80` |
|
||
| `/traefik_configurations/2/backends/backend1/servers/server2/weight` | `5` |
|
||
|
||
Once the `/traefik/alias` key is updated, the new `/traefik_configurations/2` configuration becomes active atomically. Here, we have a 50% balance between the `http://172.17.0.3:80` and the `http://172.17.0.4:80` hosts while no traffic is sent to the `172.17.0.2:80` host:
|
||
|
||
| Key | Value |
|
||
|-------------------------------------------------------------------------|-----------------------------|
|
||
| `/traefik/alias` | `/traefik_configurations/2` |
|
||
| `/traefik_configurations/1/backends/backend1/servers/server1/url` | `http://172.17.0.2:80` |
|
||
| `/traefik_configurations/1/backends/backend1/servers/server1/weight` | `10` |
|
||
| `/traefik_configurations/2/backends/backend1/servers/server1/url` | `http://172.17.0.3:80` |
|
||
| `/traefik_configurations/2/backends/backend1/servers/server1/weight` | `5` |
|
||
| `/traefik_configurations/2/backends/backend1/servers/server2/url` | `http://172.17.0.4:80` |
|
||
| `/traefik_configurations/2/backends/backend1/servers/server2/weight` | `5` |
|
||
|
||
Note that Træfɪk *will not watch for key changes in the `/traefik_configurations` prefix*. It will only watch for changes in the `/traefik` prefix. Further, if the `/traefik/alias` key is set, all other sibling keys with the `/traefik` prefix are ignored.
|
||
|