Setting up Systemd
Note currently this setup is very experimental and a work in progress.
One of the things systemd relies on for a clean unmount of the rootfs is the use of a initrd file. I'd recommend setting one of these up first using dracut before going any further.
- Certain rpi related init scripts such as from rpi3-ethfix (genpi64-overlay) don't yet support systemd
- xdm is not currently working, currently I'm missing /dev/fb0, this could be related to the init scripts that need patching, or additional modules need to be specified to be loaded on bootup
- need to investigate the use of timedatectl for ntp time
Upsides include
- A little bit quicker on boot / shutdown
- May help with controlling the shutdown process with use with the rpi x735 board (still investigating)
- https://wiki.gentoo.org/wiki/Systemd
- https://github.com/hiroru/gentoo_install#rebooting-into-our-new-gentoo-systemd
First I updated the kernel options just to add a couple in based on the Gentoo wiki.
I'm not sure if these are needed but I wanted to make sure everything in the recommended list was included.
| Config Option | Menu Location | State |
|---|---|---|
| CONFIG_CHECKPOINT_RESTORE | General Setup -> Checkpoint/restore support | Enabled |
| CONFIG_IPV6 | Networking Support -> Networking Options -> The IPv6 Protocol | Changed from module to directly included |
| CONFIG_EFS_VARS | Firmware Drivers -> EFI (Extensible Firmware Interface) Support -> EFI Variable Support via sysfs | Enabled |
| CONFIG_CRYPTO_USER_API_HASH | Cryptographic API -> User-space interface for hash algorithms | Enabled |
| CONFIG_CRYPTO_USER_API_AEAD | Cryptographic API -> User-space interface for AEAD cipher algorithms | Enabled |
Next we're going to do a depclean, then change some use flags
emerge --ask --depclean
euse -E systemd dbus warmstarts
euse -D consolekit elogind
If you want to use docker then I'd also suggest enabling cgroup-hybrid to prevent any blockages
euse -E cgroup-hybrid
Next we're going to disable netifrc for openrc then re-emerge.
This is to avoid some blockages that might crop up.
Followed by a depclean to clear out netifrc.
echo "sys-apps/openrc -netifrc" > /etc/portage/package.use/temp
emerge --oneshot sys-apps/openrc
emerge --ask --depclean
This should remove netifrc which is network support for openrc but since we're switching across to systemd we shouldn't need it anyway
Check for any conflicts
emerge -p -avDN @world
In my case I had to temporarily remove docker, during the switchover then re-install afterwards.
emerge -C app-emulation/docker
emerge the world to install systemd
emerge -avDN @world
emerge @preserved-rebuild
etc-update
Lets rebuild the initramfs using dracut
dracut --force
For some reason we need to re-install network manager.
When I first tried the above I ended up with no network so had to do a "dhcpcd eth0" just to get some basic network working just to re-install it
net-misc/networkmanager
The first line sets up some defaults, the NetworkManager sets up eth0 / wlan0 for networking
sshd is for remote access
xdm is for the xfce desktop
systemctl preset-all --preset-mode=enable-only
systemctl enable NetworkManager
systemctl enable sshd
systemctl enable xdm
Next lets get systemd up and running
reboot
Afterwards try a world update
emerge -up --deep --newuse @world
emerge -up --deep --changed-use @world
revdep-rebuild
Lets make sure the server name is set
hostnamectl set-hostname <server name>
env-update && source /etc/profile
If you needed to uninstall docker during the install then re-install it
emerge app-emulation/docker
This should remove openrc
emerge --depclean
emerge --deselect sys-apps/openrc
emerge --unmerge sys-apps/openrc
Starting and stopping services under systemd is a little different
- systemctl daemon-reexec - Can be used after an in place systemd update to avoid a reboot
- systemctl start - Can be used to start a service
- systemctl enable - Can be used to specify a service should be started on bootup
- systemctl list-units --type=service - List all available services
