This is a small post on how to run some commands or scripts at the time of booting

Need for running commands/scripts at boot time

Some times we require to load some kernel modules  or run a command to accomplish a task. If your command/script have to run continuously then use init start/stop scripts instead of keeping them in /etc/rc.local.

Running commands/scripts at boot time is achieved by using /etc/rc.local where rc stands for run-control.

Example 1: Load kernel modules through /etc/rc.local file

This is common in most of the Linux flavors. Edit /etc/rc.local file to enter modprob/insmod commands to execute them at the time of booting.

	#vi /etc/rc.local

Content:

	/sbin/modprob mac80211

	/sbin/insmod /lib/modules/3.19.0-15-generic/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko

Save the file and exit.

Example 2: Run a command at the time of booting. If you don't want to run puppet agent and just want to run when the system boots use below example.

	#vi /etc/rc.local

Content:

	/usr/bin/puppet agent --no-daemonize --verbose --onetime

save the file and exit.

Example 3: Run a script at booting

	#vi /etc/rc.local

Content:

	/home/surendra/startup_script.bash

Note: Always use complete path when keeping commands in /etc/rc.local so that it will not fail if PATH variable is not consulted.

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Surendra Anne

Mr Surendra Anne is from Vijayawada, Andhra Pradesh, India. He is a Linux/Open source supporter who believes in Hard work, A down to earth person, Likes to share knowledge with others, Loves dogs, Likes photography. He works as Devops Engineer with Taggle systems, an IOT automatic water metering company, Sydney . You can contact him at surendra (@) linuxnix dot com.