my first docker article
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content/post/docker.md
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content/post/docker.md
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---
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title: "Docker"
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date: 2021-11-13
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---
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# deploy docker container
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## systemd service file
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Generic systemd service file starting docker container using `docker compose`
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```
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[Unit]
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Description=%N service with docker compose
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Requires=docker.service
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After=docker.service
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[Service]
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Restart=always
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TimeoutStartSec=1200
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WorkingDirectory=/etc/docker-compose/%N
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# Remove old containers, images and volumes and update it
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ExecStartPre=/usr/bin/docker compose down -v
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ExecStartPre=/usr/bin/docker compose rm -fv
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ExecStartPre=/usr/bin/docker compose pull
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# Compose up
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ExecStart=/usr/bin/docker compose up
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# Compose down, remove containers and volumes
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ExecStop=/usr/bin/docker compose down -v
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[Install]
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WantedBy=multi-user.target
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```
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Create a folder /etc/docker-compose/<service-name> and place your docker-compose.yml there.
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Then symlink or copy the systemd service file to /etc/systemd/system/<service-name>.service.
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You can start the container using
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```
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systemctl start <service-name>
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```
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To automatically start the container when your server is booting enable the systemd service like any other service on your machine
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```
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systemctl enable <service-name>
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```
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## docker-compose examples
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### portainer
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[Portainer](https://portainer.io) is a nice looking and easy to use web based frontend for managing all your docker containers.
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```
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version: '3'
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services:
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portainer:
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image: portainer/portainer-ce:latest
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container_name: portainer
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restart: unless-stopped
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security_opt:
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- no-new-privileges:true
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volumes:
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- /etc/localtime:/etc/localtime:ro
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- /var/run/docker.sock:/var/run/docker.sock
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- /opt/portainer:/data
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ports:
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- 9000:9000
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```
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### watchtower
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[Watchtower](https://containrrr.dev/watchtower/) keeps all your docker container up to date.
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The following compose file uses `WATCHTOWER_SCHEDULE` to configure execution time of the updates.
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```
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version: '3'
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services:
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watchtower:
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image: containrrr/watchtower
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restart: always
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volumes:
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- /var/run/docker.sock:/var/run/docker.sock
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- /etc/timezone:/etc/timezone:ro
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- /etc/localtime:/etc/localtime:ro
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environment:
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- WATCHTOWER_CLEANUP=true
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- WATCHTOWER_INCLUDE_RESTARTING=true
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- WATCHTOWER_SCHEDULE=0 0 23 * * *
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ports:
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- 8002:8080
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```
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### monit
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["Your faithful employee, Monit"](https://mmonit.com/monit/) ;-)
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A simple and easy to use monitoring solution for all of your services.
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```
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version: '3'
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services:
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monit:
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image: maltyxx/monit:latest
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container_name: monit
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restart: unless-stopped
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volumes:
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- /etc/localtime:/etc/localtime:ro
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- /opt/docker/monit/etc:/etc/monit
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- /var/run/docker.sock:/var/run/docker.sock:ro
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ports:
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- 2812:2812
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environment:
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- "MONIT_USERNAME=admin"
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- "MONIT_PASSWORD=someSecretPassword"
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```
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### smokeping
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[Smokeping](https://oss.oetiker.ch/smokeping/) is a great way to blame your ISP.
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"My services die when my roundtrip time to <random target server on the other side end of the world> exceeds 20ms".
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And best of all, it is written in perl.
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```
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version: '3'
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services:
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smokeping:
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image: linuxserver/smokeping:latest
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container_name: smokeping
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restart: unless-stopped
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volumes:
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- /etc/localtime:/etc/localtime:ro
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- /opt/docker/smokeping/config:/config
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- /opt/docker/smokeping/data:/data
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ports:
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- 8001:80
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```
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### ipv6nat
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A little tweak for dockers "great" IPv6 support :-/
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```
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version: '3'
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services:
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ipv6nat:
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image: robbertkl/ipv6nat:latest
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container_name: ipv6nat
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restart: always
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privileged: true
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volumes:
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- /var/run/docker.sock:/var/run/docker.sock:ro
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- /usr/lib/modules:/lib/modules:ro
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cap_drop:
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- ALL
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cap_add:
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- NET_RAW
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- NET_ADMIN
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- SYS_MODULE
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network_mode: "host"
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```
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### atlas-probe
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A software probe for the [RIPE ATLAS](https://atlas.ripe.net/) project.
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One of the more advanced examples I use.
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The file creates a new network with IPv6 ULA addresses.
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Yes I know ... but docker seem to lack such bleeding edge technology (aka prober IPv6 support).
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It limits resource usage (CPU, RAM) of the docker container as well.
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```
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version: '3'
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services:
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atlas-probe:
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image: jamesits/ripe-atlas:latest
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container_name: atlas-probe
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restart: unless-stopped
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volumes:
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- /etc/localtime:/etc/localtime:ro
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- /opt/docker/atlas-probe/etc:/var/atlas-probe/etc
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- /opt/docker/atlas-probe/status:/var/atlas-probe/status
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cap_drop:
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- ALL
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cap_add:
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- CHOWN
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- SETUID
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- SETGID
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- DAC_OVERRIDE
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- NET_RAW
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environment:
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- RXTXRPT=yes
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deploy:
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resources:
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limits:
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cpus: "1.0"
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memory: "64M"
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reservations:
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memory: "64M"
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networks:
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- ripe-atlas-network
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networks:
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ripe-atlas-network:
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name: ripe-atlas-network
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enable_ipv6: true
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ipam:
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config:
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- subnet: fd00:a1a3::/48
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```
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