ETOOBUSY 🚀 minimal blogging for the impatient
Host shoots first, just like Han.
Presto! What is the port in the host that is mapped onto the port in the container?
docker run -p 12345:54321 ...
12345 in the host is mapped onto port
54321 in the
container. You have just been awarded a… Bravo!
Fact is that I keep forgetting it. I hope to remember it better with Host shoots first, just like Han.
On a more serious note, I found a very interesting article: A Brief Primer on Docker Networking Rules: EXPOSE, -p, -P, –link, which I strongly recommend.
Among the rest, it provides this nugget:
-pflag can take a few different formats:
ip:hostPort:containerPort | ip::containerPort \ | hostPort:containerPort | containerPort
So it turns out I’ve always been using the third form and never knew about it!