Move /var to another partition

gistfile1.txt

# First, boot into single user mode  (edit boot, esc + e), add init=/bin/bash after ro
# Make sure any process writing to /var is stopped. (Check with lsof | grep /var)

mkdir -p /home/var
rsync -va /var /home/var
mv /var /var.old # you can remove /var.old when you are done to reclaim the space
mkdir -p /var
mount -o bind /home/var /var

# update your /etc/fstab to make the bind-mount permanent.
/etc/fstab

 /home/var /var        none    bind