script to partition disk for swap on boot up using /etc/rc.local

gistfile1.txt

# sfdisk -d /dev/xvdb to obtain disk geometry output to use below
# 
# Format ephemeral disk into partition for swap on /dev/xvdb2

sfdisk /dev/xvdb <<EOF
unit: sectors

/dev/xvdb1 : start=     2048, size=209715200, Id=83
/dev/xvdb2 : start=209717248, size=629073920, Id=82
/dev/xvdb3 : start=        0, size=        0, Id= 0
/dev/xvdb4 : start=        0, size=        0, Id= 0

EOF

mkswap /dev/xvdb2;swapon -a

# Some apps like to write PID info into /var/run
# change /var/run to support writing as non-root user

[ ! -d /run ] && (/bin/mkdir /run)
chmod 777 /run