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docs: update the grub commands for distros with systemd >= v256 #27

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11 changes: 9 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -22,12 +22,19 @@ Add `swapaccount=1` to `GRUB_CMDLINE_LINUX_DEFAULT` section in `/etc/default/gru
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash cgroup_enable=memory swapaccount=1"
```

Some distro [enables cgroup v2 by default in their new versions](https://rootlesscontaine.rs/getting-started/common/cgroup2/), including Arch Linux (since April 2021), Fedora (since 31) and Debian. If you cannot find the directory `/sys/fs/cgroup/memory/`, this is the case for you. In this case, you also need to add the parameter `systemd.unified_cgroup_hierarchy=0` to enable cgroup v1:
Some distro [enables cgroup v2 by default in their new versions](https://rootlesscontaine.rs/getting-started/common/cgroup2/), including Arch Linux (since April 2021), Fedora (since 31) and Debian. If you cannot find the directory `/sys/fs/cgroup/memory/`, this is the case for you. In this case, you also need to add the parameter `systemd.unified_cgroup_hierarchy=0` to enable cgroup v1 and the parameter `SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1` to [force systemd to work with cgroup v1](https://github.com/systemd/systemd/issues/30852):

```bash
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash cgroup_enable=memory swapaccount=1 systemd.unified_cgroup_hierarchy=0"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash cgroup_enable=memory swapaccount=1 SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1 systemd.unified_cgroup_hierarchy=0"
```

<details>
<summary>Troubleshooting if you didn't set <code>SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1</code> and cannot boot:</summary>
<p>Enter the GRUB menu during reboot and edit the boot command of your OS. Now you can add the parameter (temporarily) and boot successfully.</p>
<p>Do not forget to update <code>/etc/default/grub</code> after you boot, or you will need to manually edit the command on every boot.</p>
</details>


And then run
```bash
update-grub && reboot
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