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Diffstat (limited to 'nixos/doc/manual/administration/container-networking.section.md')
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diff --git a/nixos/doc/manual/administration/container-networking.section.md b/nixos/doc/manual/administration/container-networking.section.md new file mode 100644 index 000000000000..0873768376cc --- /dev/null +++ b/nixos/doc/manual/administration/container-networking.section.md @@ -0,0 +1,44 @@ +# Container Networking {#sec-container-networking} + +When you create a container using `nixos-container create`, it gets it +own private IPv4 address in the range `10.233.0.0/16`. You can get the +container's IPv4 address as follows: + +```ShellSession +# nixos-container show-ip foo +10.233.4.2 + +$ ping -c1 10.233.4.2 +64 bytes from 10.233.4.2: icmp_seq=1 ttl=64 time=0.106 ms +``` + +Networking is implemented using a pair of virtual Ethernet devices. The +network interface in the container is called `eth0`, while the matching +interface in the host is called `ve-container-name` (e.g., `ve-foo`). +The container has its own network namespace and the `CAP_NET_ADMIN` +capability, so it can perform arbitrary network configuration such as +setting up firewall rules, without affecting or having access to the +host's network. + +By default, containers cannot talk to the outside network. If you want +that, you should set up Network Address Translation (NAT) rules on the +host to rewrite container traffic to use your external IP address. This +can be accomplished using the following configuration on the host: + +```nix +networking.nat.enable = true; +networking.nat.internalInterfaces = ["ve-+"]; +networking.nat.externalInterface = "eth0"; +``` + +where `eth0` should be replaced with the desired external interface. +Note that `ve-+` is a wildcard that matches all container interfaces. + +If you are using Network Manager, you need to explicitly prevent it from +managing container interfaces: + +```nix +networking.networkmanager.unmanaged = [ "interface-name:ve-*" ]; +``` + +You may need to restart your system for the changes to take effect. |