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23 lines
1.4 KiB
Markdown
23 lines
1.4 KiB
Markdown
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# Systemd
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Systemd support for a WSL distribution can be enabled by setting the following in `/etc/wsl.conf`:
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```
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[boot]
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systemd=true
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```
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When enabled, [init](init.md) will take launch `/sbin/init` (which points to systemd's init) when the distribution starts. One key difference when this setting is enabled is that [init](init.md) won't be pid 1 in the given distribution, since systemd's init requires running as pid 1, so [init](init.md) will fork(), and launch systemd in the parent while continuing WSL configuration in the child process.
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After launching `/sbin/init`, [init](init.md) waits for systemd to be ready by waiting for `systemctl is-system-running` to return either `running`, or `degraded`. After a given amount of time, WSL will time out and allow the distribution to continue starting, even if systemd isn't ready.
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## User sessions
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When systemd is enabled, WSL tries synchronizes launching processes with systemd user sessions. This is currently done by launching `login -f <user>` to start the associated systemd user session.
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## Additional systemd configuration
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To improve compatibility with systemd, WSL creates various systemd configuration files during boot (under `/run`). These configurations files are used to:
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- Protect the WSL [binfmt interpret](interop.md) from being deleted by `systemd-binfmt.service`
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- Protect the X11 socket from being deleted by `systemd-tmpfiles.serviceè
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