Linux – No Space left on device after Jenkins installation

Is there any reason i would get a 'No space left on device" error on mkdir.
I have confirmed that i have enough space left. around 68% is free. and also i have 1% iNodes consumed. This is CentOS 7 with SELinux disabled.

Following is the out of df -h:

Filesystem     1K-blocks     Used Available Use% Mounted on
/dev/xvda1      33540488 10571368  22969120  32% /
devtmpfs         3731924        0   3731924   0% /dev
tmpfs            3616424        0   3616424   0% /dev/shm
tmpfs            3616424   254592   3361832   8% /run
tmpfs            3616424        0   3616424   0% /sys/fs/cgroup
tmpfs            2097152     2880   2094272   1% /tmp

And df -i:

Filesystem       Inodes  IUsed    IFree IUse% Mounted on
/dev/xvda1     33550720 251008 33299712    1% /
devtmpfs         932981    296   932685    1% /dev
tmpfs            904106      1   904105    1% /dev/shm
tmpfs            904106    426   903680    1% /run
tmpfs            904106     13   904093    1% /sys/fs/cgroup
tmpfs            904106     14   904092    1% /tmp

What else could cause this?

edit
Although this seems to arise when Jenkins runs a build which would install a newer version of ruby through rbenv and ruby-build.