Creating /dev/random
Somehow in some Linux Centos installation the /dev/random is missing. The problem is some software needs it to working well. Here is how to create it:
mknod /dev/random c 1 9
Other devices might be missing to such as /dev/urandom, /dev/null and /dev/ptmx if you need those device here is how to create it:
mknod /dev/urandom c 1 9
mknod /dev/ptmx c 5 2
mknod /dev/null c 1 3 chmod +666 /dev/null