Quickstart

docker run -d --name squid -p 3128:3128 --restart=always \
  gmauleon/squid

Configuration

By default squid will output access logs to stdout and cache log to stderr and it will cache only in memory
You can change the configuration by mounting your own configuration file like so:

docker run -d --name squid -p 3128:3128 --restart=always \
  -v /host/etc/squid/squid.conf:/etc/squid/squid.conf \
  gmauleon/squid

You can also mount the cache and/or log directory if you want:

docker run -d --name squid -p 3128:3128 --restart=always \
  -v /host/var/log/squid:/var/log/squid \
  -v /host/var/cache/squid:/var/cache/squid \
  gmauleon/squid

Tips

For best network performance use the --network host option which will bind your docker to the host interface with default port 3128:

docker run -d --name squid --network host --restart=always \
  gmauleon/squid

Using this has also the advantage to make squid use your host IP/network for ACL and as localhost
So the cache manager will be accessible directly via:

curl localhost:3128/squid-internal-mgr/info
...
Squid Object Cache: Version 3.5.23
Build Info: 
Service Name: squid
Start Time: Tue, 12 Sep 2017 21:50:14 GMT
Current Time: Tue, 12 Sep 2017 21:53:50 GMT
...