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apps/autoheal/README_en.md
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apps/autoheal/README_en.md
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# Docker Autoheal
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Monitor and restart unhealthy docker containers.
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This functionality was proposed to be included with the addition of `HEALTHCHECK`, however didn't make the cut.
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This container is a stand-in till there is native support for `--exit-on-unhealthy` https://github.com/docker/docker/pull/22719.
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## Supported tags and Dockerfile links
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- [`latest` (*Dockerfile*)](https://github.com/willfarrell/docker-autoheal/blob/main/Dockerfile) - Built daily
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- [`1.1.0` (*Dockerfile*)](https://github.com/willfarrell/docker-autoheal/blob/1.1.0/Dockerfile)
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- [`v0.7.0` (*Dockerfile*)](https://github.com/willfarrell/docker-autoheal/blob/v0.7.0/Dockerfile)
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 [](http://microbadger.com/images/willfarrell/autoheal "Docker layer breakdown")
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## How to use
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### UNIX socket passthrough
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```bash
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docker run -d \
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--name autoheal \
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--restart=always \
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-e AUTOHEAL_CONTAINER_LABEL=all \
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-v /var/run/docker.sock:/var/run/docker.sock \
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willfarrell/autoheal
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```
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### TCP socket
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```bash
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docker run -d \
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--name autoheal \
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--restart=always \
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-e AUTOHEAL_CONTAINER_LABEL=all \
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-e DOCKER_SOCK=tcp://HOST:PORT \
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-v /path/to/certs/:/certs/:ro \
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willfarrell/autoheal
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```
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a) Apply the label `autoheal=true` to your container to have it watched.
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b) Set ENV `AUTOHEAL_CONTAINER_LABEL=all` to watch all running containers.
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c) Set ENV `AUTOHEAL_CONTAINER_LABEL` to existing label name that has the value `true`.
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Note: You must apply `HEALTHCHECK` to your docker images first. See https://docs.docker.com/engine/reference/builder/#healthcheck for details.
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See https://docs.docker.com/engine/security/https/ for how to configure TCP with mTLS
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The certificates, and keys need these names:
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* ca.pem
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* client-cert.pem
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* client-key.pem
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### Change Timezone
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If you need the timezone to match the local machine, you can map the `/etc/localtime` into the container.
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```
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docker run ... -v /etc/localtime:/etc/localtime:ro
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```
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## ENV Defaults
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```
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AUTOHEAL_CONTAINER_LABEL=autoheal
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AUTOHEAL_INTERVAL=5 # check every 5 seconds
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AUTOHEAL_START_PERIOD=0 # wait 0 seconds before first health check
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AUTOHEAL_DEFAULT_STOP_TIMEOUT=10 # Docker waits max 10 seconds (the Docker default) for a container to stop before killing during restarts (container overridable via label, see below)
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DOCKER_SOCK=/var/run/docker.sock # Unix socket for curl requests to Docker API
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CURL_TIMEOUT=30 # --max-time seconds for curl requests to Docker API
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WEBHOOK_URL="" # post message to the webhook if a container was restarted (or restart failed)
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```
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### Optional Container Labels
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```
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autoheal.stop.timeout=20 # Per containers override for stop timeout seconds during restart
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```
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## Testing
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```bash
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docker build -t autoheal .
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docker run -d \
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-e AUTOHEAL_CONTAINER_LABEL=all \
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-v /var/run/docker.sock:/var/run/docker.sock \
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autoheal
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```
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