I am using DF to check my disk usage and partition. Why doesn't it show my swap partition? I have 8GB for swap when I installed CentOS 7.
root@localhost abigail]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 196G 30G 166G 16% /
devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.9G 130M 3.7G 4% /dev/shm
tmpfs 3.9G 8.9M 3.8G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 2.0G 129M 1.9G 7% /boot
/dev/mapper/centos-home 261G 54G 207G 21% /home
Swap isn't a filesystem (like e.g. ext3) and thus isn't mounted in the normal sense. Use "swapon -s", it will confirm the numbers from the "free" output.