From Dynamic to Static IP Address on CentOS 7

Get the current network status related on some Network Interface (ex: ens192):

Now we get some important information:

• 192.168.109.56/23 => IP 192.168.109.56 & MASK 255.255.254.0
  
• GATEWAY=192.168.109.254
  

We keep all the settings except "dynamic", in /etc/sysconfig/network-scripts/ifcfg-ens192:

• ONBOOT=yes
• NM_CONTROLLED=no
• BOOTPROTO=static
• IPADDR=192.168.109.56
• NETMASK=255.255.254.0
• GATEWAY=192.168.109.254
  

After configuration saved, restart network service and verify:

• service network restart
• ip a show ens192
  

vm.max_map_count too low (65536)

• sudo sh -c 'echo "vm.max_map_count=262144" >> /etc/sysctl.conf'
• sudo sysctl -p