CentOS 8.x doesn't start SSH daemon from time to time with mkzram.service installed.
Using:
systemd-analyze verify default.target
detects ordering cycle problem (journalctl fragment):
systemd[1]: multi-user.target: Found ordering cycle on sshd.service/start
systemd[1]: multi-user.target: Found dependency on sysinit.target/start
systemd[1]: multi-user.target: Found dependency on swap.target/start
systemd[1]: multi-user.target: Found dependency on mkzram.service/start
systemd[1]: multi-user.target: Found dependency on multi-user.target/start
systemd[1]: multi-user.target: Job sshd.service/start deleted to break ordering cycle s....
=> Solution: Don't depend on default dependencies.
CentOS 8.x doesn't start SSH daemon from time to time with mkzram.service installed.
Using:
systemd[1]: multi-user.target: Found ordering cycle on sshd.service/start systemd[1]: multi-user.target: Found dependency on sysinit.target/start systemd[1]: multi-user.target: Found dependency on swap.target/start systemd[1]: multi-user.target: Found dependency on mkzram.service/start systemd[1]: multi-user.target: Found dependency on multi-user.target/start systemd[1]: multi-user.target: Job sshd.service/start deleted to break ordering cycle s....
=> Solution: Don't depend on default dependencies.