vi /etc/sysconfig/network-scripts/ifcfg-em1
# em1 is the network card name, which may be eth0, eth1,...or em1,em2... Generally, there are several network cards on a physical machine, find the network card connected to the LAN switch (please consult the network management or computer room personnel, usually eth0 or em2)
#Then add the following
IPADDR=172.16.5.19
NETMASK=255.255.255.0
Then execute the restart network card command
service network restart