keepalived为什么有时候会出现4个进程，求大佬解答

root     10833 17676  0 00:22 ?        00:00:00 //sbin/keepalived -D
root     17674     1  0  2020 ?        00:08:15 //sbin/keepalived -D
root     17675 17674  0  2020 ?        00:08:11 //sbin/keepalived -D
root     17676 17674  0  2020 ?        00:36:06 //sbin/keepalived -D