Q. I run a Linux webserver and down time is not an option for me. Now I I made some changes to my /etc/inittab file. How do I make those changes effective without rebooting my Debian Linux server?
A. The inittab file describes which processes are started at bootup and during normal operation (e.g. /etc/init.d/boot, /etc/init.d/rc, gettys…). Init distinguishes multiple runlevels, each of which can have its own set of processes that are started. Valid runlevels are 0-6 plus A, B, and C for ondemand entries.
telinit or init q option
You need to use /sbin/telinit command. It takes a one-character argument and signals init to perform the appropriate action. Q or q tell init to re-examine the /etc/inittab file.
To make changes to the /etc/inittab effective without a reboot, use init or telinit as follows:
# init q
OR
# telinit q
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| Category | List of Unix and Linux commands |
|---|---|
| File Management | cat |
| Firewall | Alpine Awall • CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
| Network Utilities | dig • host • ip • nmap |
| OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
| Package Manager | apk • apt |
| Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
| Searching | grep • whereis • which |
| User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
| WireGuard VPN | CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |
Also can be accomplished by sending SIGHUP to the init process: