Hands-on Lab·Red Hat Certified System Administrator
System Tuning with tuned
A small objective, usually taught as three commands to memorise. This measures what a profile actually changes - vm.swappiness reads 60, 10 and 30 under three different profiles - so the abstraction becomes something you can verify.
Operating Running Systems Guide 27 of 67 Beginner
- OSRHEL 10.0
- Kernel6.12.0-55.9.1.el10_0
- dnf4.20.0
- Flatpak1.16.0
- TimeAbout 11 min
tuned is installed and enabled by default on RHEL. tuned-adm recommend picks a profile from the hardware, and on a virtual machine that is virtual-guest. The profile choice persists in /etc/tuned/active_profile.
| Server Name | IP Address | OS | Roles | CPU | RAM | HDD |
|---|---|---|---|---|---|---|
| RHCSA-A01 | 192.168.0.31 | RHEL 10.0 | Practice node (graded) - spare /dev/sda | 2 Core | 4 GB | 50 GB + 15 GB |
This guide includes
Use this when tuned is taught as three commands to memorise. This matters because a profile stays abstract until you watch a value move - and recommend is making a decision you can inspect.
- finding what is active, and what is available
- seeing what
recommenddecides, and why it decides that - proving a profile does something, by watching a value change
- verifying, switching it off, and finding where the choice is stored
Before you start
- A sudo-capable account.
- The session switches profiles and restores
virtual-guestat the end.
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What is active, and what is available
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What `recommend` decides, and why
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Proving a profile does something
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Verifying, switching off, and where the choice lives