** Changed in: systemd (Ubuntu Cosmic)
Status: Fix Committed => In Progress
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https://bugs.launchpad.net/bugs/1799251
Title:
mount options for /run should be the same as initramfs tools
Status in systemd package in Ubuntu:
Fix Released
Status in systemd source package in Xenial:
New
Status in systemd source package in Bionic:
New
Status in systemd source package in Cosmic:
In Progress
Bug description:
mount options for /run should be the same as initramfs tools
[Impact]
* /run is mounted with different options on initrd boots, and initrd-
less boots. For consistency it should be the same
* In particular, this causes overuse of RAM on hosts with dense
deployment of containers. Specifically, runtime journald takes up at
most 10% or /run, which is capped at 10% of ram, thus 1% of total RAM.
However, on initrd-less boots (like lxd launch ubuntu-daily:foo), /run
takes up all of RAM, and thus run-time journal is now capped at 10% of
RAM. Which is really bad when one deploys more than 10 containers...
[Test Case]
* Check total RAM on the host with `free -h`
* lxd launch ubuntu-daily:release
* In that container check the size of /run with `df -h | grep '/run$'`
* /run should roughly be 1/10th of the total RAM.
[Regression Potential]
* /run is meant to be small, and it is small on systems booted with
initrd and everything works fine there. Reducing the default size of
/run in the containers should not have averse impacts. The most
notable change is that runtime journald is now capped 10x smaller in
the containers, to the same size as on the hosts. If that is not
enough, one should $ sudo mkdir /var/log/journal to have a larger
persistent journal.
[Other Info]
* This issue got escalated as affecting production deployments in the
Canonical datacentre.
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