With today's OpenQA tests I can point out that using zram on 2048MB RAM
VMs actually breaks FreeIPA deployment:
https://openqa.fedoraproject.org/tests/763006#step/role_deploy_domain_controller/35
OpenQA uses 2048MB RAM for QEMU VMs and this was typically OK for
FreeIPA deployment with integrated CA and DNS server. Not anymore with
zram activated:
Jan 27 21:17:47 fedora zram_generator::generator[25243]: Creating unit dev-zram0.swap (/dev/zram0 with 1384MB)
Swap on zram isn't recently enabled in Fedora, so why are the tests recently failing?
Also, the default fraction is 0.5 so the zram device size should be 1024MB. Why is it 1384MB?
which ends up eating 2/3rds of the whole memory budget and FreeIPA
installer fails:
That's not possible with default settings. The device size is not the amount of memory used. The device size is virtual. The real amount used depends on what's paged out to swap divided by the commission ratio.
If swap is being used at all it means the workload already used ~95% of memory.
2021-01-28T02:18:31Z DEBUG ipa-server-install was invoked with arguments [] and options: {'unattended': True, 'ip_addresses': None, 'domain_name': 'test.openqa.fedoraproject.org', 'realm_name': 'TEST.OPENQA.FEDORAPROJECT.ORG', 'host_name': None, 'ca_cert
2021-01-28T02:18:31Z DEBUG IPA version 4.9.1-1.fc34
2021-01-28T02:18:31Z DEBUG IPA platform fedora
2021-01-28T02:18:31Z DEBUG IPA os-release Fedora 34 (Server Edition Prerelease)
2021-01-28T02:18:31Z DEBUG Available memory is 823529472B
...
2021-01-28T02:18:31Z DEBUG The ipa-server-install command failed, exception: ScriptError: Less than the minimum 1.2GB of RAM is available, 0.77GB available.
We need more info. Something is consuming more memory than the provisioning expects. If there was no swap, the problem would be worse.
Chris Murphy