How to solve jenkins 'Disk space is too low' issue?

You can easily change the threshold from jenkins UI (my version is 1.651.3):

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Update: How to ensure high disk space

This feature is meant to prevent working on slaves with low free disk space. Lowering the threshold would not solve the fact that some jobs do not properly cleanup after they finish.

Depending on what you're building:

1. Make sure you understand what is the disk output of your build - if possible - restrict the output to happen only to the job workspace. Use workspace cleanup plugin to cleanup the workspace as post build step.
2. If the process must write some data to external folders - clean them up manually on post build steps.

Alternative1 - provision a new slave per job (use spot slaves - there are many plugins that integrate with different cloud provider to provision on the fly machines on demand)

Alternative2 - run the build inside a container. Everything will be discarded once the build is finished

Beside above solutions, there is a more "COMMON" way - directly delete the largest space consumer from Linux machine. You can follow the below steps:

1. Login to Jenkins machine (Putty)
2. cd to the Jenkins installation path

Using ls -lart to list out hidden folder also, normally jenkin installation is placed in .jenkins/ folder

[xxxxx ~]$ ls -lart

drwxrwxr-x 12 xxxx 4096 Feb 8 02:08 .jenkins/

3. list out the folders spaces

Use df -h to show Disk space in high level

du -sh ./*/ to list out total memory for each subfolder in current path.

du -a /etc/ | sort -n -r | head -n 10 will list top 10 directories eating disk space in /etc/

4. Delete old build or other large size folder

Normally ./job/ folder or ./workspace/ folder can be the largest folder. Please go inside and delete base on you need (DO NOT delete entire folder).

rm -rf theFolderToDelete

You can limit the reduce of disc space by discarding the old builds. There's a checkbox for this in the project configuration.

This is actually a legitimate question so I don't understand the downvotes, perhaps it belongs on Superuser or Serverfault. This is a soft warning threshold not hard limit where the disk is out of space.

• For hudson see where to configure hudson node disk temp space thresholds - this is talking about the host, not nodes

Jenkins is the same. The conclusion is for many small projects the system property called hudson.diagnosis.HudsonHomeDiskUsageChecker.freeSpaceThreshold could be decreased.

In saying that I haven't tested it and there is a disclaimer

No compatibility guarantee

In general, these switches are often experimental in nature, and subject to change without notice. If you find some of those useful, please file a ticket to promote it to the official feature.