Shutdown Taking Too Long? Here’s How to Investigate and Fix Long Shutdown Time in Linux

Your Linux system is taking too long to shut down? Here are the steps you can take to find out what is causing the delayed shutdown and fix the issue.

I hope you are a tad bit familiar with the sigterm and sigkill concept.

When you shut down your Linux system, it sends the sigterm and politely asks the running processes to stop. Some processes misbehave and they ignore the sigterm and keep on running.

This could cause a delay to the shutdown process as your system will wait for the running processes to stop for a predefined time period. After this time period, it sends the kill signal to force stop all the remaining running processes and shuts down the system. I recommend reading about sigterm vs sigkill to understand the difference.

In fact, in some cases, you would see a message like ‘a stop job is running’ on the black screen.

If your system is taking too long in shutting down, you can do the following:

• Check which process/service is taking too long and if you can remove or reconfigure it to behave properly.
• Change the default waiting period before your system force stops the running processes. [Quick and dirty fix]

I am using Ubuntu here which uses systemd. The commands and steps here are valid for any Linux distribution that uses systemd (most of them do).

Check which processes are causing long shutdown in Linux

If you want to figure out what’s wrong, you should check what happened at the last shutdown. Use this command to get the power of ‘I know what you did last session’ (pun intended):

journalctl -rb -1

The journalctl command allows you to read system logs. With options ‘-b -1’ you filter the logs for the last boot session. With option ‘-r’, the logs are shown in reverse chronological order.

In other words, the ‘journalctl -rb -1’ command will show the system logs just before your Linux system was shutdown the last time. This is what you need to analyze the long shutdown problem in Linux.

sudo mkdir /var/log/journal

Do you find something suspicious in the logs? Is there a process/service refusing to stop? If yes, investigate if you could remove it without side effects or if you could reconfigure it. Don’t go blindly removing stuff here, please. You should have knowledge of the process.

Speed up shutdown in Linux by reducing default stop timeout [Quick fix]

The default wait period for the shut down is usually set at 90 seconds. Your system tries to force stop the services after this time period.

If you want your Linux system to shut down quickly, you can change this waiting period.

You’ll find all the systemd settings in the config file located at /etc/systemd/system.conf. This file should be filled with lots of line starting with #. They represent the default values of the entries in the file.

Before you do anything, it will be a good idea to make a copy of the original file.

sudo cp /etc/systemd/system.conf /etc/systemd/system.conf.orig

Look for DefaultTimeoutStopSec here. It should probably be set to 90 sec.

#DefaultTimeoutStopSec=90s

You have to change this value to something more convenient like 5 or 10 seconds.

DefaultTimeoutStopSec=5s

If you don’t know how to edit the config file in terminal, use this command to open the file for editing in your system’s default text editor (like Gedit):

sudo xdg-open /etc/systemd/system.conf

Don’t forget to remove the # before DefaultTimeoutStopSec. Save the file and reboot your system.

This should help you reduce the shutdown delay for your Linux system.

ps -af | grep watch*

Recommended Read:

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