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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
parent 0e8d6601b6
commit ef17b3a56e
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2 changed files with 40 additions and 12 deletions
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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`
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
All the dependencies you need to develop this project (apart from Docker itself) are

26
docker-entrypoint.sh
View File

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