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Docker Installation

Cleanup cronjob 

0 4 * * * /usr/bin/docker container prune -f && /usr/bin/docker image prune -f

Install from distro APT 

apt install -y gnupg2 pass apparmor-utils docker.io docker-compose docker-compose-plugin

Docker stop all 

docker stop $(docker ps -a -q)

or

docker ps -q | % { docker stop $_ }

Search trough logs 

docker logs --since "$(date -d 'today 13:30' +'%Y-%m-%dT%H:%M:%S')" --until "$(date -d 'today 13:40' +'%Y-%m-%dT%H:%M:%S')" prodapp

Manually cleanup old logs

As root, not with sudo!

truncate -s 0 /var/lib/docker/containers/**/*-json.log

Install from Docker APT 

sudo apt-get update && sudo apt-get install ca-certificates curl && sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc && sudo chmod a+r /etc/apt/keyrings/docker.asc

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

Remove all containers from a host 

docker rm -f $(docker ps -qa)

Remove all volumes from a host 

docker volume rm $(docker volume ls -q)

Login with PAT

Create a new Personal Access Token here.

export PAT=.....
echo $PAT | docker login ghcr.io --username doesnt@matter.com --password-stdin

echo $PAT | docker login registry.gitlab.com -u aiketestuser1 --password-stdin

or

echo "ghp_REPLACE_ME" | docker login ghcr.io --username doesnt@matter.com --password-stdin

Filter docker ps columns

Link: docker docs

 docker ps -a --format="table {{.Names}}\t{{.Ports}}\t{{.CreatedAt}}\t{{.Status}}\t{{.Mounts}}"

Run sleep in a container that won’t start 

docker run --rm --entrypoint sh ubuntu:latest -c "sleep infinity"

Log rotation

In /etc/docker/daemon.json:

{
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m",
    "max-file": "5"
  }
}

or use Logrotate!

/var/lib/docker/containers/*/*.log {
  rotate 7
  daily
  compress
  missingok
  delaycompress
  copytruncate
}

Show log file sizes 

sudo find /var/lib/docker/containers/ -name *-json.log -exec ls -lh {} \;

Check log rotation status for container 

docker inspect -f '' your_container

Truncate logfile manually

If you don’t want to recreate the container.

truncate -s 0 /var/lib/docker/containers/<container-id>/<container-id>-json.log

Docker prune 

docker image prune -af --filter "until=24h"

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