Traefik 2.0 and docker simple configuration doesnt work - docker

I'm following some tutorial link_to_tutorial about traefik 2.0 and docker, and I have docker-compose file which starts up two containers: traefik and my-app. The problem is when containers up and running, I am not able to browse to localhost:8082, as suggested by configuration, I always get "unable to connect" in browser.
docker-compose.yml :
version: "3.3"
services:
traefik:
image: "traefik:v2.0.1"
command:
- --entrypoints.web.address=:80
- --providers.docker
- --api.insecure
ports:
- "80:80"
- "8080:8080"
volumes:
- "/var/run/docker.sock:/var/run/docker.sock:ro"
my-app:
image: containous/whoami:v1.3.0
command:
# It tells whoami to start listening on 8082 instead of 80
- --port=8082
labels:
- "traefik.http.routers.my-app.rule=Host(`whoami.docker.localhost`)"
- "traefik.http.services.my-app.loadbalancer.server.port=8082"
However I am able to get localhost:8080 and traefik UI works well. As I understand all requests to "traefik" container normally should be redirected to "my-app":8082 container but it somehow fails. Help heeded.Thanks.

"traefik.http.routers.my-app.rule=Host(localhost,127.0.0.1)"

Related

Traefik routing one application to port 80, others require explicit port

I have an environment running docker containers.
This environment hosts Traefik, Nextcloud, MotionEye and Heimdall.
I also have another environment running CoreDNS in a docker container.
For some reason, I can get MotionEye to be accessible from motioneye.docker.swarm (changed the domain in here for privacy).
However, for nextcloud and Heimdall, I have to explicitly access the ports and I'm struggling to tell why.
e.g. Heimdall is gateway.docker.swarm:8091 when should be gateway.docker.swarm
When a user requests a webpage onto the local dns server X.X.X.117 it gets routed through to the traefik instance on X.X.X.106.
My traefik compose file is as follows:
version: '3'
services:
reverse-proxy:
# The official v2 Traefik docker image
image: traefik:v2.3
restart: always
# Enables the web UI and tells Traefik to listen to docker
command: --api.insecure=true --providers.docker
ports:
# The HTTP port
- "80:80"
# The Web UI (enabled by --api.insecure=true)
- "8080:8080"
volumes:
# So that Traefik can listen to the Docker events
- /var/run/docker.sock:/var/run/docker.sock
labels:
- "traefik.port=8080"
- "traefik.backend=traefik"
- "traefik.frontend.rule=Host:traefik.docker.swarm"
- "traefik.docker.network=traefik_default"
My Heimdall compose is as follows:
version: "3"
services:
heimdall:
image: ghcr.io/linuxserver/heimdall
container_name: heimdall
environment:
- PUID=1000
- PGID=1000
- TZ=Europe/London
volumes:
- /home/pi/heimdall/config:/config
ports:
- 8091:80
restart: unless-stopped
networks:
- heimdall
labels:
- "traefik.enable=true"
- "traefik.port=8091"
- "traefik.http.routers.heimdall.entrypoints=http"
- "traefik.http.routers.heimdall.rule=Host(`gateway.docker.swarm`)"
networks:
heimdall:
external:
name: heimdall
Can anyone see what I'm doing wrong here?
When you access through gateway.docker.swarm:8091 it works because you are accessing the heimdall container directly. This is possible because you defined
ports:
- 8091:80
in your docker-compose.
In order to access through traefik they must be on the same network. Also, remove the port mapping if you like this container to be only accessible through traefik. And finally correct the traefik port accordingly.
version: "3"
services:
heimdall:
image: ghcr.io/linuxserver/heimdall
container_name: heimdall
environment:
- PUID=1000
- PGID=1000
- TZ=Europe/London
volumes:
- /home/pi/heimdall/config:/config
restart: unless-stopped
labels:
- "traefik.enable=true"
- "traefik.port=80"
- "traefik.http.routers.heimdall.entrypoints=http"
- "traefik.http.routers.heimdall.rule=Host(`gateway.docker.swarm`)"

traefik docker basic exemple return 404

I'm starting to use treafix but I facing a wall. I'm trying to start with the basic docker example provided here : https://doc.traefik.io/traefik/user-guides/docker-compose/basic-example/
version: "3.8"
services:
traefik:
image: "traefik:v2.3"
container_name: "traefik"
command:
- "--log.level=DEBUG"
- "--accessLog"
- "--api.insecure=true"
- "--providers.docker=true"
- "--providers.docker.exposedbydefault=false"
- "--entrypoints.web.address=:80"
ports:
- "80:80"
- "8080:8080"
volumes:
- "/var/run/docker.sock:/var/run/docker.sock:ro"
whoami:
image: "traefik/whoami"
container_name: "simple-service"
labels:
- "traefik.enable=true"
- "traefik.http.routers.whoami.entrypoints=web"
- "traefik.http.routers.whoami.rule=Host('server.local')"
As I'm local, I've set up "server.local" in my hostfile to point to 127.0.0.1
However, when I run it with compose and try to access my server.local I only got a 404, not the whoami expected response. I don't see anything that jump to me as wrong within the logs but again, I'm starting in, the traefik area.
I'm using docker desktop on windows wityh WSL2 and running the compose inside an ubuntu WSL2 vm
I found my issue :
In the traefik rule, you should only use backtick (`) and not a single quote (') to define string litteral
so my :
- "traefik.http.routers.whoami.rule=Host('server.local')"
should be
- "traefik.http.routers.whoami.rule=Host(`server.local`)"
I wished the traefik documentation made this much more clear, especially in the default exemples ...

How do I configure traefik properly for docker services on subdomains?

The example from the traefik quickstart guide for using the whoami image on the whoami subdomain works, but I can't get jellyfin working in a similar setup, and I can't figure out what's different:
kevin#pihost:~/personal$ curl -H Host:jellyfin.kevinm416.com http://127.0.0.1
Bad Gateway
kevin#pihost:~/personal$ curl -H Host:whoami.kevinm416.com http://127.0.0.1
Hostname: f7820e1787fe
IP: 127.0.0.1
...
This is my docker-compose file, which has all the traefik config:
version: "3"
volumes:
jellyfin-config:
jellyfin-cache:
services:
reverse-proxy:
image: traefik:v2.2
# Enables the web UI and tells Traefik to listen to docker
command:
- "--api.insecure=true"
- "--providers.docker"
- "--entrypoints.web.address=:80"
- "--entrypoints.websecure.address=:443"
ports:
- "80:80"
- "443:443"
# The Web UI (enabled by --api.insecure=true)
- "8080:8080"
volumes:
- /var/run/docker.sock:/var/run/docker.sock
whoami:
image: containous/whoami
labels:
- "traefik.http.routers.whoami.rule=Host(`whoami.kevinm416.com`)"
jellyfin:
image: jellyfin/jellyfin
network_mode: "host"
environment:
TZ: 'America/Los_Angeles'
ports:
- "8096:8096"
volumes:
- jellyfin-config:/config
- jellyfin-cache:/cache
- /home/kevin/microcenter:/microcenter:ro
labels:
- "traefik.http.routers.jellyfin.rule=Host(`jellyfin.kevinm416.com`)"
- "traefik.http.services.jellyfin.loadbalancer.server.port=8096"
restart: always
I guess there could be two problems:
you haven't specified entrypoints for your containers, e.g. for whoami it could be (maybe you want new one for jellyfin with port 8096?):
- "traefik.http.routers.whoami.entrypoints=web"
network_mode: "host" in jellyfin -- traefik should be in the same network as container (or try to use traefik.docker.network setting), so I would suggest just remove that line.

Nexus 3 as Docker Registry behind Traefik v.2 - pushing fails

On the same linux VM with docker v.19.03.11 I'm running:
Nexus:
version: '3.7'
services:
nexus:
container_name: nexus
image: sonatype/nexus3
volumes:
- nexus-data:/nexus-data
networks:
- web
ports:
- 8081
- 8082
- 8083
restart: always
labels:
- "traefik.enable=true"
- "traefik.docker.network=web"
# admin.nexus.xxx.intern
- "traefik.http.routers.nexus.rule=Host(`admin.nexus.xxx.intern`, `maven.nexus.itools.intern`)"
- "traefik.http.services.nexus.loadbalancer.server.port=8081"
- "traefik.http.routers.nexus.service=nexus"
- "traefik.http.routers.nexus.entrypoints=web"
# docker.nexus.xxx.intern
- "traefik.http.routers.docker.rule=Host(`docker.nexus.xxx.intern`)"
- "traefik.http.services.docker.loadbalancer.server.port=8083"
- "traefik.http.routers.docker.service=docker"
- "traefik.http.routers.docker.entrypoints=web"
networks:
web:
external: true
volumes:
nexus-data:
external: true
in Nexus Repository Manager Dashboard I created one hosted docker repository and assigned it port 8083.
and Traefik:
version: '3.7'
services:
traefik:
container_name: traefik
image: traefik
volumes:
- /var/run/docker.sock:/var/run/docker.sock
- ./conf:/conf
- ../ssl:/ssl:ro
networks:
- web
ports:
- 80:80
- 443:443
restart: always
command:
# Enabling docker provider
- "--providers.docker=true"
# Do not expose containers unless explicitly told so
- "--providers.docker.exposedbydefault=false"
# Enable API (listening on port 8080)
- "--api.insecure=true"
- "--entrypoints.web.address=:80"
- "--entrypoints.websecure.address=:443"
# Enable the file provider to define routers / middlewares / services in file
# EMPTY AT THE TIME!
- "--providers.file.directory=/conf"
labels:
- "traefik.enable=true"
- "traefik.http.routers.traefik.service=api#internal"
- "traefik.http.routers.traefik.rule=Host(`traefik.xxx.intern`)"
- "traefik.http.routers.traefik.entrypoints=web"
- "traefik.http.routers.traefik_tls.tls=true"
- "traefik.http.routers.traefik_tls.rule=Host(`traefik.xxx.intern`)"
- "traefik.http.routers.traefik_tls.entrypoints=websecure"
- "traefik.http.routers.traefik_tls.service=api#internal"
networks:
web:
external: true
I can login into the docker repository form anywhere:
docker login -u user -p password1234 docker.nexus.xxx.intern
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
Login Succeeded
but I cannot push into the registry:
docker push docker.nexus.xxx.intern/hello-world
The push refers to repository [docker.nexus.xxx.intern/hello-world]
af0b15c8625b: Preparing
error parsing HTTP 404 response body: invalid character 'p' after top-level value: "404 page not found\n"
When I expose the port 8083 and bypass Traefik, everything works fine and I can push into the Nexus Registry. The problem is I can only expose ports 80 and 443.
Did anyone have a similar issue and knows how to solve it?
Update 1
Have also tried with Harbor - the same result - cannot push behind traefik.
Same issue for me. I've tried
Option 1 : add prefix on path for v2 as Docker is putting a /v2 prefix
traefik.http.routers.docker.rule=Host(`docker.nexus.xxx.intern`) && PathPrefix(`/{version:(v1|v2)}/`)
Option 2 : add prefix to request and remove it with a middleware replacepathregex
traefik.http.middlewares.replace-path.replacepathregex.regex=^/(v1|v2)/(push|pull)/(.*)
traefik.http.middlewares.replace-path.replacepathregex.replacement=/$$1/$$3
traefik.http.routers.docker.rule=Host(`docker.nexus.xxx.intern`) && PathPrefix(`/{version:(v1|v2)}/push/`)
traefik.http.routers.nexus-registry-push.middlewares=replace-path
Try adding to the Nexus container in docker-compose file
environment:
- "REGISTRY_HTTP_RELATIVEURLS=true"

Request from one docker container to another fails

I've been trying to connect two docker containers. My flask backend and my react frontend, when I use localhost in the request the request goes through, but when i use the docker container name ie http://backend-service:5000/endpoint , the name can't be resolved. The documentation states that the containers connect to the same networking automatically and that accessing services from one should be as simple as that. I've tried adding links to the docker compose file as well with no luck.
Here is my docker-compose file:
version: '3'
services:
backend-service:
build: ./api
expose:
- 5000
ports:
- "5000:5000"
volumes:
- ./api:/usr/src/app
environment:
- FLASK_ENV=development
- FLASK_APP=app.py
- FLASK_DEBUG=1
client-service:
build: ./clientside
expose:
- 3000
ports:
- "3000:3000"
volumes:
- ./clientside/src:/usr/src/app/src
- ./clientside/public:/usr/src/app/public
links:
- "backend-service:backend"

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