System and Service Manager systemd is a suite of basic building blocks for a Linux system. It provides a system and service manager that runs as PID 1 and starts the rest of the system. systemd …

Frequently Asked Questions Also check out the Tips & Tricks! Q: How do I change the current runlevel? A: The concept of runlevels is obsolete. A set of target units are exposed that carry similar …

Known Environment Variables A number of systemd components take additional runtime parameters via environment variables. Many of these environment variables are not supported at the same level as …

Diagnosing Boot Problems If your machine gets stuck during boot, first check if the hang happens before or after control passes to systemd. Try to boot without rhgb and quiet on the kernel command line. If …

systemd-boot UEFI Boot Manager systemd-boot is a UEFI boot manager which executes configured EFI images. The default entry is selected by a configured pattern (glob) or an on-screen menu. systemd …

Users, Groups, UIDs and GIDs on systemd Systems Here’s a summary of the requirements systemd (and Linux) make on UID/GID assignments and their ranges. Note that while in theory UIDs and …

The Container Interface Also consult Writing Virtual Machine or Container Managers. systemd has a number of interfaces for interacting with container managers, when systemd is used inside of an OS …

Of course, before optimizing you should instrument the boot to generate profiling data, so make sure you know your way around with systemd-bootchart, systemd-analyze and pytimechart! Optimizations …

Build systemd as usual, but pick only the built files you need from the result of “make install DESTDIR= ", by using the file listing functionality of your packaging software. For example: if all you want is the …

PCR/NvPCR Measurements Made by systemd-cryptsetup (Userspace) PCR 15, volume key The systemd-cryptsetup@.service service will measure a key derived from the LUKS volume key of a …