LetвЂ™s look at an example so you can see what IвЂ™m talking about.

Namely, some of the configuration I thought might happen automagically doesnвЂ™t actually happen. Host mode seems pretty straight forward but there are some items you need to keep in mind when deploying it. Note that my docker1 host now has two IP interfaces. Keep in mind that all these modes area applied at the container level so we can certainly have a mix of different network modes on the same docker host.ДЇor this post, IвЂ™m going to use the same lab I used in the first post but with a minor tweakвЂ¦ This allows for you to create custom network configuration which weвЂ™ll talk about more in a later post. It tells docker to put the container in its own network stack but not to do configure any of the containers network interfaces. None вЂ“ This one is pretty straight forward. This means that while other resources (processes, filesystem, etc) will be kept separate, the network resources such as port mappings and IP addresses of the first container will be shared by the second container. Mapped Container mode вЂ“ This mode essentially maps a new container into an existing containers network stack. This one is sort of interesting and has some caveats but weвЂ™ll talk about those in greater detail below.

That is, all of the network interfaces defined on the host will be accessible to the container. That being said, what this really does is just put the container in the hosts network stack. Host mode вЂ“ The docker documentation claims that this mode does вЂnot containerize the containers networking!вЂ™. There are really 4 docker вЂprovidedвЂ™ network modes in which you can run containersвЂ¦Д«ridge mode вЂ“ This is the default, we saw how this worked in the last post with the containers being attached to the docker0 bridge. In this post, IвЂ™d like to start covering the remaining non-default network configuration modes. In our last post we covered what docker does with container networking in a default configuration.

2022.03

Docker network host explained