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These are the steps for a hostname change or an IP address change for a CentOS 7 or RHEL 7 host

IP address change only

  1. If the IP address is moving OUT of the current subnet/vlan, then this needs to be coordinated with Networking.
    1. Unless if the host is a VMware VM, then the subnet change can be done by the VMware administrator.
  2. Change the IP address in NetDB:
  3. Verify the host is using DHCP 
    1. check the netdb entry for the DHCP checkbox and correct MAC address
    2. check the host's interface configuration file to verify it's using DHCP
      1. /etc/sysconfig/network-scripts/ifcfg-*
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