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Docker

Table of Contents

General

Install docker

sudo curl -sSL https://get.docker.com | sh
sudo groupadd docker
sudo usermod -aG docker $USER

Enabling memory cgrouping and disable swap

nano /boot/cmdline.txt
  cgroup_enable=cpuset cgroup_enable=memorystring swapaccount=1

Update all docker images

docker images | awk '(NR>1) && ($2!~/none/) {print $1":"$2}' | xargs -L1 docker pull

Build the docker image described in Dockerfile and tag it

docker build -t example-arm . -f Dockerfile

Curl a specified host behind traefik

curl -LS -H Host:portainer.example.com 192.168.2.0

Install a plugin

docker plugin install fentas/davfs

Compose

Install compose

sudo apt install python-pip && pip install -U docker-compose

Up a compose file and remove old container.

docker-compose up -d --remove-orphans

Pull and up all container

docker-compose pull && docker-compose up -d --remove-orphans

Swarm

Install docker-volume-netshare

wget https://github.com/ContainX/docker-volume-netshare/releases/download/v0.35/docker-volume-netshare_0.35_armhf.deb
sudo dpkg -i docker-volume-netshare_0.35_armhf.deb

Create a stack on armhf architecture.

docker stack up --compose-file docker-compose.yml --resolve-image never --prune swarm

Force update a service

docker service update swarm_portainer --force

Limit the stopped container docker should keep. Use 0 to remove them instantly. (Default: 5)

docker swarm update --task-history-limit 3

Master

Create a docker swarm

docker swarm init

Show the respective join token again.

docker swarm join-token manager
docker swarm join-token worker

Worker

To join a swarm as a worker run the following on:

Linux

docker swarm join --token TOKEN

Windows

docker-machine create worker
docker-machine env worker
docker-machine ssh worker
docker swarm join --token TOKEN

Postgres

Postgres volume mounts in docker compose

db_test:
  driver: local
  driver_opts:
    type: cifs
    device: //127.0.0.1/docker/db_test
    o: username=USER,password=PASS,uid=70,gid=70,file_mode=0700,dir_mode=0700

db_test:
  driver: local
  driver_opts:
    type: nfs
    o: addr=192.168.178.2,rw
    device: :/nfs/db_test

Required nfs server exports

sudo nano /etc/exports

/nfs               127.0.0.1(rw,nohide,insecure,no_subtree_check,async,no_root_squash)

Misc

Run docker image with .env file.

docker run -it --rm --env-file ~/.env alpine /bin/ash