Lxd container: port forwarding like docker

containerslxclxdport-forwarding

Is there a way to do port-forwarding in lxd-containers like docker does?

I heard some rumours that there is no easy way.

According to the homepage of lxd this is their goal:

Intuitive (simple, clear API and crisp command line experience)

For me port forwarding is an important part.

I am not in a hurry. If it is planed for a future release, this would be a valid answer.

Best Answer

One of the developers wrote in this issue about the topic:

This has been closed, but to give a clear answer: lxd (at least as currently intended) will not do host networking. So in general you would port-forward to a web-server in a lxd container the same way you would do with lxc - you can pass in a nic from the host into the container and have your local router provide it its own address; or use route-based networking to container veths; or use iptables forwarding to forward host traffic into the container (which is what I usually do).

See https://help.ubuntu.com/lts/serverguide/lxc.html#lxc-network for more information.

~~So, I'm afraid, as things stand currently, there is no port forwarding, neither now nor in the future.~~ (This prediction turned out to be not true)

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Linux container bridge port forwarding

Unfortunately I cannot comment because of low reputation, so please do not downvote if I'm not correct.

I've googled around a d found this networking guide for "LXC", but it mostly seems to apply also to "LXD": http://www.flockport.com/lxc-networking-guide/

Within this article there is part "Deploy containers in cloud KVMs". Portforwarding is explained here, so please try this (and adopt the command for the IPs in your environment:

iptables -t nat -I PREROUTING -i eth0 -p TCP -d 1.1.1.1/32 --dport 80 -j DNAT --to-destination 10.0.3.165:80

Docker – Howto expose port in docker container

You need to add the EXPOSE statement to your Dockerfile for port 8080.

Here's the reference from Docker: https://docs.docker.com/engine/reference/builder/#expose

Your final Dockerfile should look like this:

FROM adzerk/boot-clj

EXPOSE 8080

WORKDIR /app
COPY . /app

Best Answer

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Linux container bridge port forwarding

Docker – Howto expose port in docker container

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