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Cleanup networking docs

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Jip-Hop 2024-07-03 15:29:31 +02:00
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@ -23,7 +23,7 @@ Add the `--network-bridge=br1 --resolv-conf=bind-host` systemd-nspawn flag when
The TrueNAS host and the jail will be able to communicate with each other as if the jail was just another device on the LAN. It will use the same DNS servers as the TrueNAS host because the `--resolv-conf=bind-host` option bind mounts the `/etc/resolv.conf` file from the host inside the jail. If you want to use the DNS servers advertised via DHCP, then check [DNS via DHCP](#dns-via-dhcp). The TrueNAS host and the jail will be able to communicate with each other as if the jail was just another device on the LAN. It will use the same DNS servers as the TrueNAS host because the `--resolv-conf=bind-host` option bind mounts the `/etc/resolv.conf` file from the host inside the jail. If you want to use the DNS servers advertised via DHCP, then check [DNS via DHCP](#dns-via-dhcp).
### Bridge Static IP ### Bridge Static IP
To configure a static IP with our bridge interface, we need to edit the `/etc/systemd/network/80-container-host0.network` file. Change the [Network] section to look like this: To configure a static IP with our bridge interface, we need to edit the `/etc/systemd/network/80-container-host0.network` file. Change the [Network] section to look like this:
```ini ```ini
[Network] [Network]
@ -43,14 +43,14 @@ ifconfig
``` ```
### Multiple Bridge Interfaces ### Multiple Bridge Interfaces
[Systemd-nspawn](https://www.freedesktop.org/software/systemd/man/latest/systemd-nspawn.html), the technology on which jailmaker is built, [currently](https://github.com/systemd/systemd/issues/11087) only supports the definition and automatic configuration of a single bridge interface via the [`--network-bridge`](https://www.freedesktop.org/software/systemd/man/latest/systemd-nspawn.html#--network-bridge=) argument. In some cases however, for instance when trying to utilize different vlan interfaces, it can be useful to configure multiple bridge interfaces within a jail. It is possible to create extra interfaces and join them to host bridges manually with systemd-nspwan using a combination of the [`--network-veth-extra`](https://www.freedesktop.org/software/systemd/man/latest/systemd-nspawn.html#--network-veth-extra=) argument and a service config containing `ExecStartPost` commands as outlined [here](https://wiki.csclub.uwaterloo.ca/Systemd-nspawn#Multiple_network_interfaces). [Systemd-nspawn](https://www.freedesktop.org/software/systemd/man/latest/systemd-nspawn.html), the technology on which jailmaker is built, [currently](https://github.com/systemd/systemd/issues/11087) only supports the definition and automatic configuration of a single bridge interface via the [`--network-bridge`](https://www.freedesktop.org/software/systemd/man/latest/systemd-nspawn.html#--network-bridge=) argument. In some cases however, for instance when trying to utilize different vlan interfaces, it can be useful to configure multiple bridge interfaces within a jail. It is possible to create extra interfaces and join them to host bridges manually with systemd-nspwan using a combination of the [`--network-veth-extra`](https://www.freedesktop.org/software/systemd/man/latest/systemd-nspawn.html#--network-veth-extra=) argument and a service config containing `ExecStartPost` commands as outlined [here](https://wiki.csclub.uwaterloo.ca/Systemd-nspawn#Multiple_network_interfaces).
The `--network-veth-extra` argument instructs system-nspawn to create an addition linked interface between the host and jail and uses a syntax of The `--network-veth-extra` argument instructs system-nspawn to create an addition linked interface between the host and jail and uses a syntax of
``` ```
--network-veth-extra=<host_interface_name>:<jail_interface_name> --network-veth-extra=<host_interface_name>:<jail_interface_name>
``` ```
The service config constaining `ExecStartPost` commands is then used to add the host side of the interface link to an existing host bridge and bring the interface up. Jailmaker has simplified this process by including a `post_start_hook` configuration parameter which can automate the creation of the service config by including the `ExecStartPost` commands as below. The service config `ExecStartPost` commands is then used to add the host side of the interface link to an existing host bridge and bring the interface up. Jailmaker has simplified this process by including a `post_start_hook` configuration parameter which can automate the creation of the service config by including the `ExecStartPost` commands as below.
``` ```
post_start_hook=#!/usr/bin/bash post_start_hook=#!/usr/bin/bash
@ -62,7 +62,7 @@ post_start_hook=#!/usr/bin/bash
ip link set dev ve-docker-2 up ip link set dev ve-docker-2 up
``` ```
With the new `--network-veth-extra` interface link created and the host side added to an existing host bridge, the jail side of the link still needs to be configured. Jailmaker provides a network file in the form of `/etc/systemd/network/vee-dhcp.network` which will automatically perform this configuration. In order for `vee-dhcp.network` to successfully match and configure the link's jail side interface, the `<jail_interface_name>` must begin with a ***vee-*** prefix. An example jailmaker config with properly named `--network-veth-extra` interfaces and `post_start_hook` commands is available [here](https://github.com/Jip-Hop/jailmaker/discussions/179#discussioncomment-9499289). With the new `--network-veth-extra` interface link created and the host side added to an existing host bridge, the jail side of the link still needs to be configured. Jailmaker provides a network file in the form of `/etc/systemd/network/vee-dhcp.network` which will automatically perform this configuration. In order for `vee-dhcp.network` to successfully match and configure the link's jail side interface, the `<jail_interface_name>` must begin with a ***vee-*** prefix. An example jailmaker config with properly named `--network-veth-extra` interfaces and `post_start_hook` commands is available [here](https://github.com/Jip-Hop/jailmaker/discussions/179#discussioncomment-9499289).
## Macvlan Networking ## Macvlan Networking