How To Install oomd on AlmaLinux 8
Introduction
In this tutorial we learn how to install oomd on AlmaLinux 8.
What is oomd
Out of memory killing has historically happened inside kernel space. On a memory overcommitted linux system, malloc(2) and friends usually never fail. However, if an application dereferences the returned pointer and the system has run out of physical memory, the linux kernel is forced take extreme measures, up to and including killing processes. This is sometimes a slow and painful process because the kernel can spend an unbounded amount of time swapping in and out pages and evicting the page cache. Furthermore, configuring policy is not very flexible while being somewhat complicated. oomd aims to solve this problem in userspace. oomd leverages PSI and cgroupv2 to monitor a system holistically. oomd then takes corrective action in userspace before an OOM occurs in kernel space. Corrective action is configured via a flexible plugin system, in which custom code can be written. By default, this involves killing offending processes. This enables an unparalleled level of flexibility where each workload can have custom protection rules. Furthermore, time spent livedlocked in kernelspace is minimized.
We can use yum or dnf to install oomd on AlmaLinux 8. In this tutorial we discuss both methods but you only need to choose one of method to install oomd.
Install oomd on AlmaLinux 8 Using dnf
Update yum database with dnf using the following command.
sudo dnf makecache --refresh
After updating yum database, We can install oomd using dnf by running the following command:
sudo dnf -y install oomd
Install oomd on AlmaLinux 8 Using yum
Update yum database with yum using the following command.
sudo yum makecache --refresh
After updating yum database, We can install oomd using yum by running the following command:
sudo yum -y install oomd
How To Uninstall oomd on AlmaLinux 8
To uninstall only the oomd package we can use the following command:
sudo dnf remove oomd
References
Summary
In this tutorial we learn how to install oomd on AlmaLinux 8 using yum and dnf.