Adding Failover IP's subnet

darwin7

• November 30, 2017 00:50

Good morning I just purchased a new server and a failover subnet/29 associated to it. Then, I installed minimal Centos7.4 and Cloudlinux. Since I have a poor knowledge of networking, I not installed/configured the subnet in the OS. During the cPanel installation, I installed the failover subnet/29 using the appropriate interface (Add a new IP address). Everything run smoothly, and the new IP's are regularly seen from both cPanel and CentOS+CL. Then, to better understand how cPanel managed the new IP/29, I checked /etc/sysconfig/network-scripts and I found nothing changed. The directory is untouched as it was after the CentOS+CL installation. The only changes I found is two new files: /etc/ipaddrpool and /etc/ips. Both CentOS's NetworkManager (nmtui) and ifconfig -a see the new IP's! Interface is enp2s0. Now, the question is: how/where cPanel manages the new IP's pool? What OS configuration files are used? Since /etc/sysconfig/network-scripts seem not used, how can the OS see the new subnet IP's? Thank you

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  24x7server

  • November 30, 2017 13:12

  Hi, ipaddrpool and ips are the 2 files where it stores the IP information that you give in the WHM interface..

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  darwin7

  • November 30, 2017 14:34

  Hi, ipaddrpool and ips are the 2 files where it stores the IP information that you give in the WHM interface..

  
  Yes, thank you! As I wrote in the post, I know this. I need to understand what happen in OS's side.

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  cPanelMichael

  • November 30, 2017 17:10

  Then, to better understand how cPanel managed the new IP/29, I checked /etc/sysconfig/network-scripts and I found nothing changed. The directory is untouched as it was after the CentOS+CL installation.

  
  Hello, This is not automatically handled with the cPanel & WHM software, as is something you need to setup manually on the OS. The CentOS forums might be a better resource for how to do this. EX: CENTOS 7, VMWARE and OVH Failover IP - CentOS

  Both CentOS's NetworkManager (nmtui) and ifconfig -a see the new IP's! Interface is enp2s0.

  
  Note that Network Manager can override settings managed by the network service and disrupt ipaliases. It's unsupported, and enabling it is not recommend (even post-installation). An additional document is available at:

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  darwin7

  • November 30, 2017 17:26

  Note that Network Manager can override settings managed by the network service and disrupt ipaliases. It's unsupported, and enabling it is not recommend (even post-installation). An additional document is available at:

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