I've got some strange issue. I have following setup: one docker-host running traefik as LB serving multiple sites. sites are most php/apache. HTTPS is managed by traefik. Each site is started using a docker-compose YAML containing the following:
version: '2.3'
services:
redis:
image: redis:alpine
container_name: ${PROJECT}-redis
networks:
- internal
php:
image: registry.gitlab.com/OUR_NAMESPACE/docker/php:${PHP_IMAGE_TAG}
environment:
- APACHE_DOCUMENT_ROOT=${APACHE_DOCUMENT_ROOT}
container_name: ${PROJECT}-php-fpm
volumes:
- ${PROJECT_PATH}:/var/www/html:cached
- .docker/php/php-ini-overrides.ini:/usr/local/etc/php/conf.d/99-overrides.ini
ports:
- 80
networks:
- proxy
- internal
labels:
- traefik.enable=true
- traefik.port=80
- traefik.frontend.headers.SSLRedirect=false
- traefik.frontend.rule=Host:${PROJECT}
- "traefik.docker.network=proxy"
networks:
proxy:
external:
name: proxy
internal:
(as PHP we use 5.6.33-apache-jessie or 7.1.12-apache f.e.)
Additionally to above, some sites get following labels:
traefik.docker.network=proxy
traefik.enable=true
traefik.frontend.headers.SSLRedirect=true
traefik.frontend.rule=Host:example.com, www.example.com
traefik.port=80
traefik.protocol=http
what we get is that some requests end in 502 Bad Gateway traefik debug output shows:
time="2018-03-21T12:20:21Z" level=debug msg="vulcand/oxy/forward/http: Round trip: http://172.18.0.8:80, code: 502, Length: 11, duration: 2.516057159s"
can someone help with that? it's completely random when it happens our traefik.toml:
debug = true
checkNewVersion = true
logLevel = "DEBUG"
defaultEntryPoints = ["https", "http"]
[accessLog]
[web]
address = ":8080"
[web.auth.digest]
users = ["admin:traefik:some-encoded-pass"]
[entryPoints]
[entryPoints.http]
address = ":80"
# [entryPoints.http.redirect] # had to disable this because HTTPS must be enable manually (not my decission)
# entryPoint = "https"
[entryPoints.https]
address = ":443"
[entryPoints.https.tls]
[retry]
[docker]
endpoint = "unix:///var/run/docker.sock"
domain = "example.com"
watch = true
exposedbydefault = false
[acme]
email = "[email protected]"
storage = "acme.json"
entryPoint = "https"
onHostRule = true
[acme.httpChallenge]
entryPoint = "http"
Could the issue be related to using the same docker-compose.yml?
For anyone getting the same issue:
After recreating the network (proxy) and restarting every site/container it seems to work now. I still don't know where the issue was from.