Docker Compose

This is an add-on for Docker where you can specify whole sets of services into a single file and start them at once. You can also port container setups to other servers more easily.

docker-compose.yml reference

inspect service	`docker inspect $(docker-compose ps -q SERVICENAME)`
inspect all services	`docker inspect $(docker-compose ps -q)`
execute something in a container	`docker exec CONTAINERNAME COMMAND`
get a shell in a container	`docker exec CONTAINERNAME sh`
show all mounted paths	`docker inspect -f '{{ ..:index-.mounts-0-.source }}' $(docker-compose ps -q)`

docker-compose build --no-cache

Traefik – "the cloud native edge router"
nginx-proxy + letsencrypt-nginx-proxy-companion
HA-proxy – HAProxy variant of nginx-proxy
caddy-docker-proxy – Plugin for the Caddy webserver to automatically server docker pages
Envoy – Edge and service proxy

Environment Variables (Github Wiki)

/srv/docker/service/docker-compose.yml

version: '3'
services:
[…]
    environment:
     - VIRTUAL_HOST=example.tilde.fun
     - LETSENCRYPT_HOST=example.tilde.fun
    networks:
     - webproxy
 
[…]
networks:
[…]
  webproxy:
    external: true

isn't able to connect to container

expose the port:

docker-compose.yml

    expose:
      - "80"

(source)

reload nginx config

docker kill --signal=HUP docker-gen

(source)

Maybe there's still a volume left over from docker-compose down? Check with docker volume ls and remove with docker volume prune and docker volume rm.

Do not mount the folder where your docker-compose.yml and env-files are into a container. If your container is breached, one could easily gain root access to the whole host system!

Do use a reverse proxy. It makes handling SSL certificates and load balancing much easier.

Docker Compose

useful commands

build

force recreation

reverse proxy

jwilder

isn't able to connect to container

reload nginx config

troubleshooting

it should work, but it doesn't!

dos and donots