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Document how to free some space on a node in openshift

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Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>
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Pierre-Yves Chibon 2020-02-13 09:34:07 +01:00
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# How to free some space in openshift?
If your builds run into an error looking like:
```
error: build error: devmapper: Thin Pool has 11561 free data blocks which is
less than minimum required 11944 free data blocks. Create more free space in
thin pool or use dm.min_free_space option to change behavior
```
It is likely that one or several of the nodes has some disk space issues.
## Check the disk space on the nodes:
You can do this via ansible by simply running:
```
ansible -a 'lvs' os_nodes_stg
```
The output will look somthing like this:
```
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root GuestVolGroup00 -wi-ao---- <58.59g
docker-pool vg-docker twi-a-t--- 58.32g 42.00 18.44
os-node02.stg.phx2.fedoraproject.org | CHANGED | rc=0 >>
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root GuestVolGroup00 -wi-ao---- <58.59g
docker-pool vg-docker twi-a-t--- <48.60g 32.37 14.81
os-node01.stg.phx2.fedoraproject.org | CHANGED | rc=0 >>
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root GuestVolGroup00 -wi-ao---- <58.59g
docker-pool vg-docker twi-a-t--- 58.32g 40.75 17.38
os-node04.stg.phx2.fedoraproject.org | CHANGED | rc=0 >>
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root GuestVolGroup00 -wi-ao---- <58.59g
docker-pool vg-docker twi-a-t--- 58.32g 90.32 28.35
```
In this case you can see that ``os-node04.stg`` has a disk full at 90%.
## Free space on a node
There is a cron job running regularly to clean up docker images that aren't
needed anymore, but you can also run it manually to free some space.
The command to run is then:
```
docker rmi $(docker images --filter dangling=true -q)
```
Source: https://pagure.io/fedora-infrastructure/issue/8643