/etc/rc[0-6].d Directory Explained
Contains scripts for different runlevels
/etc/rc[0-6].d directories are system directories that contain scripts used to start
or stop system services. These directories are used during the system boot process and each one corresponds to a
different runlevel. The scripts within these directories are not placed there directly but are usually symbolic links
pointing to the init scripts located in the
What It Is Used For
These directories play a crucial role in the initialization of your Linux system. They are responsible for starting and
stopping services based on the runlevel your system is entering or leaving. For example, the scripts
/etc/rc0.d are run when the system is halted, while those
/etc/rc6.d are run when the system is rebooting.
Why It Is Important
Understanding the role of these directories is essential for managing your Linux system, especially if you are setting up a server. The scripts in these directories control essential services like networking, logging, and scheduling. If a service fails to start properly, it may be due to a problem with the corresponding script in one of these directories.
How It May Be Related To Other Directories/Commands/Files
As mentioned earlier, the scripts in these directories are usually symbolic links to the actual init scripts in
/etc/init.d directory. This means that changes to the scripts
/etc/init.d will affect the operation of the corresponding services.
Potential Problems And Pitfalls
One common problem related to these directories is the incorrect configuration of service start and stop priorities. Each script in these directories is prefixed with a number, which determines the order in which the scripts are run. If these numbers are not configured correctly, services may fail to start due to dependencies on other services that have not yet started.
For example, to view the contents of the
/etc/rc5.d directory, you can use
This will give you an output similar to:
S01acpid S01atop S01autofs S01cron S01lvm2-lvmpolld S01named S01ntp S01rsyslog S01ssh S01uuidd
S01atd S01atopacct S01console-setup.sh S01dbus S01mdadm S01nfs-kernel-server S01rsync S01smartmontools S01sudo
Examples In Bash
To start or stop a service, you could in principle run the corresponding script.
However, it’s usually better to use the
command to manage services, as these commands provide a more standardized interface and handle dependencies between
services. For example, you can stop the
network service with the following command:
systemctl stop network
In conclusion, the /etc/rc[0-6].d directories are essential components of the Linux system boot process. By understanding their role and how to work with them, you can gain greater control over your Linux system and solve common problems related to system services.