Docker Tricks

Base directory for mounting

mkdir -p ~/Projects/docker
cd ~/Projects/docker

What this is for?

This is for replacing some system components in my development machine. Since I use ArchLinux, that is a rolling release, sometimes I need to lock components to the app I developing, or use this machines as a radioactive components that I can just rm later. Examples:

• Rails ES gem does not yet support Elasticsearch 6, so I just use an ES 5.6 docker instance
• ArchLinux is behind versions in certain components (MariaDB 11 is not available, and I need to test some JSON goodies).
• If everything goes wrong, just remove the fucking docker instance.
• I only trust PostgreSQL as host service, not docker one, using the nice pacman packages that dont break anything :)

Why don't you use docker compose?

My dev environment changes a lot. It is easier to manage some pieces individually. If you do develop a single application at a large time span, you're better off creating composer files and running them.

Dockers with Proxy

Considering that $PWD is the base directory

Running Traefik as HTTP Proxy server

mkdir traefik
curl https://raw.githubusercontent.com/containous/traefik/master/traefik.sample.toml > traefik/traefik.toml
docker run -d \
  --name traefik \
  --publish 80:80 \
  --mount type=bind,source=/var/run/docker.sock,target=/var/run/docker.sock \
  --mount type=bind,source=$PWD/traefik/traefik.toml,target=/traefik.toml \
  --label traefik.port=8080 \
  --label traefik.frontend.rule=Host:monitor.localhost \
  traefik \
  --docker \
  --docker.domain=localhost \
  --docker.watch \
  --web

You can now use http://monitor.localhost to observe your requests.

Portainer as Docker GUI

mkdir portainer
docker run -d \
  --name portainer \
  --mount type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \
  --mount type=bind,src=$PWD/portainer,dst=/data \
  --label traefik.port=9000 \
  portainer/portainer \
  -H unix:///var/run/docker.sock

You can now use http://portainer.localhost to manage your Docker containers.

MySQL

mkdir mysql
docker run -d \
  --name mysql \
  -p 3306:3306 \
  -v $PWD/mysql:/var/lib/mysql \
  -e MYSQL_ROOT_PASSWORD="MY ROOT PASSWORD" \
  --memory 384000000 \
  --restart unless-stopped \
  mysql:5.7

Memory: Limit memory usage in bytes

It exposes port 3306 to your host computer (and potentially to your network if your host is not firewalled). Now you can install a compatible mysql client in your host OS.

For ArchLinux: pacman -S percona-server-clients or pacman -S mariadb-clients

Ghost using MySQL above

Creating database and privileges

mysql -h 127.0.0.1 -uroot -p
CREATE USER 'ghost'@'%';
GRANT ALL PRIVILEGES ON ghost.* To 'ghost'@'%' IDENTIFIED BY 'ghost123';
FLUSH PRIVILEGES;

CTRL-D to disconnect

Creating the docker instance

mkdir ghost
docker run -d \
          --name ghost \
          --mount type=bind,src=$PWD/ghost,dst=/var/lib/ghost/content \
          --label traefik.port=2368 \
          --link mysql:mysql \
          -e database__client=mysql \
          -e database__connection__host=mysql \
          -e database__connection__user=ghost \
          -e database__connection__password=ghost123 \
          -e database__connection__database=ghost \
          --restart unless-stopped \
          ghost:alpine

First time setup will be available at http://ghost.localhost/ghost/ and the blog at http://ghost.localhost/

Other useful dockers

Redis

docker run --name redis -d \
          --memory 384000000 \
          --restart unless-stopped
          redis:alpine