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Provide the ability to bind to a Unix socket

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Michael Irwin 2024-10-17 16:58:52 -04:00
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commit ef17b3a56e
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26
README.md
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@ -153,6 +153,32 @@ For example, [balenaOS](https://www.balena.io/os/) exposes its socket at
`/var/run/balena-engine.sock`. To accommodate this, merely set the `SOCKET_PATH` `/var/run/balena-engine.sock`. To accommodate this, merely set the `SOCKET_PATH`
environment variable to `/var/run/balena-engine.sock`. environment variable to `/var/run/balena-engine.sock`.
## Exposing as a Unix socket
If you'd like to expose the proxy as a Unix socket, you can do so by setting the
`BIND_CONFIG` environment variable.
As an example, the following command will start the proxy and bind to the socket at
`/sockets/docker.sock`. Since this is a volume, this could then be shared with another
container.
```
$ docker container run \
-d --privileged \
--name dockerproxy \
-v /var/run/docker.sock:/var/run/docker.sock \
-v docker-socket:/sockets \
-e BIND_CONFIG=/sockets/docker.sock \
tecnativa/docker-socket-proxy
```
Once running, the socket can be shared with another container by using the
`docker-socket` volume:
```
$ docker container run -v docker-socket:/var/run ...
```
## Development ## Development
All the dependencies you need to develop this project (apart from Docker itself) are All the dependencies you need to develop this project (apart from Docker itself) are

26
docker-entrypoint.sh
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@ -1,21 +1,23 @@
#!/bin/sh #!/bin/sh
set -e set -e
# Normalize the input for DISABLE_IPV6 to lowercase if [ "${BIND_CONFIG}" = "" ]; then
DISABLE_IPV6_LOWER=$(echo "$DISABLE_IPV6" | tr '[:upper:]' '[:lower:]') # Normalize the input for DISABLE_IPV6 to lowercase
DISABLE_IPV6_LOWER=$(echo "$DISABLE_IPV6" | tr '[:upper:]' '[:lower:]')
# Check for different representations of 'true' and set BIND_CONFIG # Check for different representations of 'true' and set BIND_CONFIG
case "$DISABLE_IPV6_LOWER" in case "$DISABLE_IPV6_LOWER" in
1|true|yes) 1|true|yes)
BIND_CONFIG=":2375" BIND_CONFIG=":2375"
;; ;;
*) *)
BIND_CONFIG="[::]:2375 v4v6" BIND_CONFIG="[::]:2375 v4v6"
;; ;;
esac esac
fi
# Process the HAProxy configuration template using sed # Process the HAProxy configuration template using sed
sed "s/\${BIND_CONFIG}/$BIND_CONFIG/g" /usr/local/etc/haproxy/haproxy.cfg.template > /usr/local/etc/haproxy/haproxy.cfg sed "s#/\${BIND_CONFIG}#$BIND_CONFIG#g" /usr/local/etc/haproxy/haproxy.cfg.template > /usr/local/etc/haproxy/haproxy.cfg
# first arg is `-f` or `--some-option` # first arg is `-f` or `--some-option`
if [ "${1#-}" != "$1" ]; then if [ "${1#-}" != "$1" ]; then