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systemctl --version

systemd 245 (245.4-4ubuntu3.15)
+PAM +AUDIT +SELINUX +IMA +APPARMOR 
+SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP 
+GCRYPT +GNUTLS +ACL +XZ +LZ4 
+SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 
-IDN +PCRE2 default-hierarchy=hybrid

  1. What does default-hierarchy=hybrid mean?

  2. What does the + or - prefixes mean? 3. And how to change them?

foshyboy
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1 Answers1

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default-hierarchy=hybrid means that the default cgroup hierarchy is the hybrid variant; see What specifies the version of cgroups (cgroups or cgroups2) used by the distro? and the links there for details.

The - and + indicate systemd features; they are configured at build time. To change them, you’d have to rebuild systemd.

Stephen Kitt
  • 434,908
  • How to "rebuild systemd"? – foshyboy Apr 10 '22 at 05:58
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    @foshyboy "Why to rebuild systemd" might be the real question. Generally, since systemd is a very low-level part of a Linux distro, it's not someting to take lightly. Of course, it can be an incredible learning experience, but... if that's not your goal, it might be a good idea to step back. The compiled-in options are chosen by the distro for a reason. – mattdm Apr 15 '22 at 18:03