Place /tmp and /var/tmp on EC2 instance store

fstab

# /etc/fstab

LABEL=cloudimg-rootfs   /               ext4    defaults                                        0       0
/dev/xvdb               /mnt/is0        auto    defaults,nobootwait,comment=instancestore0      0       2
/dev/xvdc               /mnt/is1        auto    defaults,nobootwait,comment=instancestore1      0       2
/mnt/is0/tmp            /tmp            none    bind,noauto                                     0       0
/mnt/is0/var/tmp        /var/tmp        none    bind,noauto                                     0       0

rc.local

# /etc/rc.local

# Create directories on instance store
test -d /mnt/is0/tmp || mkdir -m 1777 /mnt/is0/tmp
test -d /mnt/is0/var/tmp || mkdir -p -m 1777 /mnt/is0/var/tmp

# Mount these directories
mount /tmp
mount /var/tmp

exit 0