increasing the size of my /tmp folder

How do I increase the size of my /tmp folder? Jenkins gives me a "disk space is too low error" for the /tmp directory on my slave nodes

Here's what I've done to increase the partition size:

Run the following commands:

dd if=/dev/zero of=/usr/tmp-dir bs=1024M count=2
mke2fs -j /usr/tmp-dir
mount -t ext3 -o loop /usr/tmp-dir /tmp

added the line to my /etc/fstab file

/usr/tmp-dir /tmp ext3 defaults,loop 0 0

then

chmod 1777 /tmp
chown root.root /tmp

am I on the right track?