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.iad2.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.iad2.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.iad2.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)
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This needs to be run on the |
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