How to update all packages on a CentOS system?
Jun 25, 2025 am 12:01 AM
To update all software packages on the CentOS system, you can use yum (CentOS 7) or dnf (CentOS 8 and above). The specific steps are as follows: 1. Check for available updates and use "sudo yum check-update" or "sudo dnf check-update" to list the packages to be updated; 2. Execute the system-wide update, and use "sudo yum update -y" or "sudo dnf upgrade --allowerasing" commands to upgrade, where the -y parameter automatically confirms the operation, and --allowerasing allows the removal of conflicting packages; 3. If the update involves a new kernel, the system needs to be restarted to take effect. You can use "uname -r" and "rpm -q kernel" to view the current kernel version and decide whether to restart; 4. Install auxiliary plug-ins such as yum-plugin-needs-restarting or dnf-plugins-core to identify services that need to be restarted; it is recommended to update regularly but avoid blind operations, especially in production environments. You should view the change log in advance, select low peak execution, and verify in the test environment first.
Updating all packages on a CentOS system is a straightforward process, but it's important to do it right. The main tool you'll use is yum (on CentOS 7) or dnf (on CentOS 8 and later), which handles package management. Here's how to safely and effectively update everything.
Check for Available Updates
Before jumping into an update, it's a good idea to see what packages actually need updating. This helps avoid surprises and give you a sense of what might be changing on your system.
-
On CentOS 7 (using
yum):sudo yum check-update
On CentOS 8 (using
dnf):sudo dnf check-update
These commands will list all the packages that have newer versions available in the configured repositories.
Perform a Full System Update
Once you know there are updates ready, it's time to apply them.
For CentOS 7:
sudo yum update -y
For CentOS 8 and newer:
sudo dnf upgrade --allowerasing
The -y flag automatically answers "yes" to prompts, while --allowerasing allows DNF to remove conflicting packages if necessary — this can help avoid dependency issues.
Note: If you're using CentOS Stream,
dnfwill also pull in updates from the stream's repository, so make sure that aligns with your environment needs.
Reboot When Necessary
Some updates — especially kernel updates — require a reboot to take effect. After running the update command, check if a reboot is needed.
You can usually tell by whether a new kernel was installed. To see current kernel version:
uname -r
And to list installed kernels:
rpm -q kernel
If a newer kernel is present and you want to use it, just reboot:
sudo reboot
Also, consider installing yum-plugin-needs-restarting (for YUM) or dnf-plugins-core (for DNF), which includes tools like needs-restarting to help identify services needing restart after updates.
Keep It Regular — But Not Blind
It's a good practice to run system updates regularly, but not all updates are safe to apply blindly, especially on production systems.
- Check changelogs before updating critical packages.
- Consider staging environments for testing updates before rolling them out widely.
- Avoid updating during high-traffic hours if possible.
Also, remember that some packages may pull in dependencies or deprecate certain features, so always keep an eye on logs and service behavior after updates.
That's basically it. Updating all packages on CentOS doesn't have to be complicated — just a few commands and a bit of awareness about what's changing.
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