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53 lines
1.8 KiB
Markdown
53 lines
1.8 KiB
Markdown
# Declarative Container Specification {#sec-declarative-containers}
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You can also specify containers and their configuration in the host's
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`configuration.nix`. For example, the following specifies that there
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shall be a container named `database` running PostgreSQL:
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```nix
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{
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containers.database =
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{ config =
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{ config, pkgs, ... }:
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{ services.postgresql.enable = true;
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services.postgresql.package = pkgs.postgresql_14;
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};
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};
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}
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```
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If you run `nixos-rebuild switch`, the container will be built. If the
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container was already running, it will be updated in place, without
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rebooting. The container can be configured to start automatically by
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setting `containers.database.autoStart = true` in its configuration.
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By default, declarative containers share the network namespace of the
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host, meaning that they can listen on (privileged) ports. However, they
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cannot change the network configuration. You can give a container its
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own network as follows:
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```nix
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{
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containers.database = {
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privateNetwork = true;
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hostAddress = "192.168.100.10";
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localAddress = "192.168.100.11";
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};
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}
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```
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This gives the container a private virtual Ethernet interface with IP
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address `192.168.100.11`, which is hooked up to a virtual Ethernet
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interface on the host with IP address `192.168.100.10`. (See the next
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section for details on container networking.)
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To disable the container, just remove it from `configuration.nix` and
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run `nixos-rebuild
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switch`. Note that this will not delete the root directory of the
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container in `/var/lib/nixos-containers`. Containers can be destroyed using
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the imperative method: `nixos-container destroy foo`.
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Declarative containers can be started and stopped using the
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corresponding systemd service, e.g.
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`systemctl start container@database`.
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