That’s how I thought it would work with discourse running inside of Docker too, however when I actually ran it, during the bootstrapping process I saw:
INFO -- : > cd /var/www/discourse && git reset --hard
# oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
# Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=195, just started
# Configuration loaded
# Could not create server TCP listening socket *:6379: bind: Address already in use
Checking out files: 100% (27893/27893), done.
And I had found this thread about “install fails because of other redis container”, however the problem actually was low disk space… Reorganized some things and it does work just fine with multiple standalone containers.