80 lines
2.1 KiB
Markdown
80 lines
2.1 KiB
Markdown
# Watchtower in docker
|
|
|
|
###### guide-by-example
|
|
|
|
|
|
|
|
# Purpose
|
|
|
|
Automatic updates of docker containers.
|
|
|
|
* [Github](https://github.com/containrrr/watchtower)
|
|
* [DockerHub image used](https://hub.docker.com/r/containrrr/watchtower)
|
|
|
|
Watchtower is an application that will monitor the running Docker containers
|
|
and watch for changes to the images that those containers
|
|
were originally started from. If watchtower detects that an image has changed,
|
|
it will automatically restart the container using the new image.
|
|
|
|
As of now, Watchtower needs to always pull images to know if they changed.
|
|
This can be bandwidth intensive, so its scheduled checks should account for this.
|
|
|
|
# Files and directory structure
|
|
|
|
```
|
|
/home/
|
|
└── ~/
|
|
└── docker/
|
|
└── watchtower/
|
|
├── .env
|
|
└── docker-compose.yml
|
|
```
|
|
|
|
* `.env` - a file containing environment variables for docker compose
|
|
* `docker-compose.yml` - a docker compose file, telling docker how to run the container
|
|
|
|
Only these two files must be provided.
|
|
|
|
# docker-compose
|
|
|
|
Scheduled to run every saturday at midnight using environment variable.</br>
|
|
Heads up that not a typical cron format is used,
|
|
[seconds are the first digit](https://pkg.go.dev/github.com/robfig/cron@v1.2.0?tab=doc#hdr-CRON_Expression_Format).
|
|
|
|
`docker-compose.yml`
|
|
```yml
|
|
version: '3'
|
|
services:
|
|
|
|
watchtower:
|
|
image: containrrr/watchtower:latest
|
|
container_name: watchtower
|
|
hostname: watchtower
|
|
restart: unless-stopped
|
|
env_file: .env
|
|
volumes:
|
|
- /var/run/docker.sock:/var/run/docker.sock
|
|
```
|
|
|
|
`.env`
|
|
```bash
|
|
# GENERAL
|
|
|
|
# WATCHTOWER
|
|
WATCHTOWER_SCHEDULE=0 0 0 * * SAT
|
|
WATCHTOWER_CLEANUP=true
|
|
WATCHTOWER_TIMEOUT=30s
|
|
WATCHTOWER_DEBUG=false
|
|
WATCHTOWER_INCLUDE_STOPPED=false
|
|
```
|
|
|
|
# Update
|
|
|
|
* [watchtower](https://github.com/DoTheEvo/selfhosted-apps-docker/tree/master/watchtower)
|
|
updates itself automatically
|
|
|
|
* manual image update</br>
|
|
`docker-compose pull`</br>
|
|
`docker-compose up -d`</br>
|
|
`docker image prune`
|