how to add static routes on centos7

1. add static routes

   vi /etc/sysconfig/static-routes
   route add –host 192.168.1.2 gw 192.168.1.1
   route add –net 192.168.1.0/24 gw 192.168.1.1
   

2. two network cards

   vi /etc/sysconfig/network-scripts/ifcfg-eth0
   IPV4_ROUTE_METRIC=99