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| {{QA/Test_Case
| | This is a dead page. Use https://fedoraproject.org/wiki/QA:Testcase_CoreOS_swap_on_zram instead. |
| |description=Install and validate Fedora CoreOS with swap on zram enabled
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| |setup=
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| # Download and verify the latest [https://getfedora.org/coreos/download?tab=metal_virtualized&stream=next FCOS <b>next</b> image] (pick the right image for your environment).
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| # Read background on zram [https://www.fedoraproject.org/wiki/Changes/SwapOnZRAM here].
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| # Figure out how you'd like to configure your initial zram device.
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| # Read other possible post-boot tests as described [https://fedoraproject.org/wiki/QA:Testcase_SwapOnZRAM_customconfig here].
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| |actions=
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| # [https://docs.fedoraproject.org/en-US/fedora-coreos/producing-ign/ Create an Ignition file].
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| # Configure Zram device validating instructions [https://docs.fedoraproject.org/en-US/fedora-coreos/sysconfig-configure-swaponzram/ here].
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| # Launch your Fedora CoreOS system using this Ignition file. See [https://docs.fedoraproject.org/en-US/fedora-coreos/getting-started/#_quickstart the Quickstart] and the provisioning docs for a guide how to launch FCOS in most environments (bare metal, virtual, cloud, etc).
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| |results=
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| # You can SSH successfully into your FCOS system and that it is on the expected version
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| <pre>
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| $ ssh 172.25.81.173
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| Fedora CoreOS 36.20220325.1.0
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| Tracker: https://github.com/coreos/fedora-coreos-tracker
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| Discuss: https://discussion.fedoraproject.org/tag/coreos
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| Last login: Mon Apr 4 14:42:45 2022 from 156.111.209.231
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| [core@d-zram-test-1 ~]$
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| </pre>
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| # Verify the zram configuration injected by ignition is as expected.
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| | |
| <pre>$ cat /etc/systemd/zram-generator.conf
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| # This config file enables a /dev/zram0 device with the default settings
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| [zram0]
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| </pre>
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| # Verify zram has been correctly defined as a swap partition and to the expected size
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| The default is min(ram/4,4096) which in our 16GB machine instance means 4G.
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| | |
| <pre>[core@d-zram-test-1 ~]$ zramctl --output-all
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| zramctl --output-all
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| NAME DISKSIZE DATA COMPR ALGORITHM STREAMS ZERO-PAGES TOTAL MEM-LIMIT MEM-USED MIGRATED MOUNTPOINT
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| /dev/zram0 4G 4K 80B lzo-rle 4 0 12K 0B 12K 0B [SWAP]
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| [core@d-zram-test-1 ~]$ swapon
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| NAME TYPE SIZE USED PRIO
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| /dev/zram0 partition 4G 0B 100
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| </pre>
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| | |
| # Saturate memory and confirm usage via zramctl
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| Initially fill memory with 15GB usage and confirm usage via top. No swap.
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| | |
| <pre>
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| [core@d-zram-test-1 ~]$ </dev/zero head -c 15G | tail &
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| [1] 1810
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| [core@d-zram-test-1 ~]$ sleep 5
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| [core@d-zram-test-1 ~]$ top -o %MEM -bn1 | head -n 15
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| top - 14:50:20 up 14 min, 1 user, load average: 0.60, 0.24, 0.12
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| Tasks: 125 total, 3 running, 122 sleeping, 0 stopped, 0 zombie
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| %Cpu(s): 1.6 us, 1.6 sy, 0.0 ni, 95.2 id, 0.0 wa, 0.0 hi, 0.0 si, 1.6 st
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| MiB Mem : 15994.1 total, 238.0 free, 15687.3 used, 68.9 buff/cache
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| MiB Swap: 4096.0 total, 4068.9 free, 27.1 used. 109.9 avail Mem
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| | |
| PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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| 1810 core 20 0 15.1g 15.1g 1668 R 6.2 96.4 0:15.48 tail
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| 1466 root 20 0 1440984 15588 3844 S 0.0 0.1 0:00.27 dockerd
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| 1475 root 20 0 1345832 14856 2416 S 0.0 0.1 0:01.83 containerd
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| 773 root 20 0 58856 10444 9236 S 0.0 0.1 0:00.46 systemd-journal
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| 1513 root 20 0 770212 6928 0 S 0.0 0.0 0:00.16 docker-driver
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| 848 systemd+ 20 0 23984 6688 3256 S 0.0 0.0 0:00.14 systemd-resolve
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| 1 root 20 0 172348 5396 848 S 0.0 0.0 0:03.69 systemd
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| 1759 core 20 0 19240 4480 1348 R 12.5 0.0 0:06.30 sshd
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| </pre>
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| | |
| <li>Now add a further 3G of usage which we expect to be fulfilled by swap and therefore zram as the prioritized device.
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| | |
| <pre>[core@d-zram-test-1 ~]$ </dev/zero head -c 3G | tail &
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| [2] 1815
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| [core@d-zram-test-1 ~]$ top -o %MEM -bn1 | head -n 15
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| top - 14:50:36 up 14 min, 1 user, load average: 0.65, 0.27, 0.14
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| Tasks: 126 total, 1 running, 125 sleeping, 0 stopped, 0 zombie
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| %Cpu(s): 1.5 us, 3.1 sy, 0.0 ni, 95.4 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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| MiB Mem : 15994.1 total, 189.2 free, 15760.8 used, 44.1 buff/cache
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| MiB Swap: 4096.0 total, 1050.6 free, 3045.3 used. 48.7 avail Mem
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| PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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| 1810 core 20 0 15.1g 12.1g 280 S 6.2 77.7 0:15.87 tail
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| 1815 core 20 0 3162560 3.0g 264 S 6.2 19.3 0:03.57 tail
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| 1466 root 20 0 1440984 10548 0 S 0.0 0.1 0:00.27 dockerd
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| 1475 root 20 0 1345832 9648 2888 S 0.0 0.1 0:01.87 containerd
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| 1513 root 20 0 770212 6172 0 S 0.0 0.0 0:00.17 docker-driver
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| 1816 core 20 0 7856 3624 2996 R 0.0 0.0 0:00.00 top
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| 1 root 20 0 172348 2868 0 S 0.0 0.0 0:03.69 systemd
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| 1760 core 20 0 6212 2004 1644 S 0.0 0.0 0:00.55 bash
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| [core@d-zram-test-1 ~]$ zramctl --output-all
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| NAME DISKSIZE DATA COMPR ALGORITHM STREAMS ZERO-PAGES TOTAL MEM-LIMIT MEM-USED MIGRATED MOUNTPOINT
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| /dev/zram0 4G 3G 35.6M lzo-rle 4 381047 43.4M 0B 47.4M 57B [SWAP]
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| [core@d-zram-test-1 ~]$ swapon
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| NAME TYPE SIZE USED PRIO
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| /dev/zram0 partition 4G 3G 100
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| </pre>
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| # Verify the linked documentation makes sense, nothing is obviously missing, and the instructions are clear.
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| }}
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| No changes required.
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| [[Category:CoreOS Test Cases]]
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