Tag: systemctl

reboot, shutdown, halt & systemctl

If you have been working on Linux for some time -- longer than a few years, you probably has come from runlevel days which the services are managed by SysV init scripts. So you are familiar with the commands like shutdown, init, halt, reboot etc. which are used to start, stop or bring the system … Continue reading reboot, shutdown, halt & systemctl →

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runlevel returns “unknown” on Oracle Linux 7

systemd has replaced SysVinit as the default service manager in Oracle Linux 7 (RHEL 7), but for the backward compatibility reason, the runlevel command is still available and it is a symbolic link to systemctl. Some old programs relies on the return result of runlevel to continue such as Oracle 12c installation prerequisite checks. I … Continue reading runlevel returns “unknown” on Oracle Linux 7 →