Sysadmin How to add a IPv4 Failover Range to CentOS 7?

google search "add ip range centos 7 ovh failover" leads to Configure a failover IP with CentOS - OVH Canada

google-fu

 

try and see, you can script it with a for sequence loop

this one just echo/displays the output not create the files themselves nor does it insert contents of files, you can do that if you rewrite the for sequence loop yourself

example IP range 192.168.2.2 to 192.168.2.10

Code (Text):

for i in {2..10}; do echo -e "\n/etc/sysconfig/network-scripts/ifcfg-eth0:${i}"; echo "
DEVICE="eth0:$i"
BOOTPROTO=static
IPADDR="192.168.2.$i"
NETMASK="255.255.255.255"
BROADCAST="xxx.xxx.xxx.xxx"
ONBOOT=yes";
echo -e "\nifup eth0:${i}";
done

gives following display only output

Code (Text):

/etc/sysconfig/network-scripts/ifcfg-eth0:2

DEVICE=eth0:2
BOOTPROTO=static
IPADDR=192.168.2.2
NETMASK=255.255.255.255
BROADCAST=xxx.xxx.xxx.xxx
ONBOOT=yes

ifup eth0:2

/etc/sysconfig/network-scripts/ifcfg-eth0:3

DEVICE=eth0:3
BOOTPROTO=static
IPADDR=192.168.2.3
NETMASK=255.255.255.255
BROADCAST=xxx.xxx.xxx.xxx
ONBOOT=yes

ifup eth0:3

/etc/sysconfig/network-scripts/ifcfg-eth0:4

DEVICE=eth0:4
BOOTPROTO=static
IPADDR=192.168.2.4
NETMASK=255.255.255.255
BROADCAST=xxx.xxx.xxx.xxx
ONBOOT=yes

ifup eth0:4

/etc/sysconfig/network-scripts/ifcfg-eth0:5

DEVICE=eth0:5
BOOTPROTO=static
IPADDR=192.168.2.5
NETMASK=255.255.255.255
BROADCAST=xxx.xxx.xxx.xxx
ONBOOT=yes

ifup eth0:5

/etc/sysconfig/network-scripts/ifcfg-eth0:6

DEVICE=eth0:6
BOOTPROTO=static
IPADDR=192.168.2.6
NETMASK=255.255.255.255
BROADCAST=xxx.xxx.xxx.xxx
ONBOOT=yes

ifup eth0:6

/etc/sysconfig/network-scripts/ifcfg-eth0:7

DEVICE=eth0:7
BOOTPROTO=static
IPADDR=192.168.2.7
NETMASK=255.255.255.255
BROADCAST=xxx.xxx.xxx.xxx
ONBOOT=yes

ifup eth0:7

/etc/sysconfig/network-scripts/ifcfg-eth0:8

DEVICE=eth0:8
BOOTPROTO=static
IPADDR=192.168.2.8
NETMASK=255.255.255.255
BROADCAST=xxx.xxx.xxx.xxx
ONBOOT=yes

ifup eth0:8

/etc/sysconfig/network-scripts/ifcfg-eth0:9

DEVICE=eth0:9
BOOTPROTO=static
IPADDR=192.168.2.9
NETMASK=255.255.255.255
BROADCAST=xxx.xxx.xxx.xxx
ONBOOT=yes

ifup eth0:9

/etc/sysconfig/network-scripts/ifcfg-eth0:10

DEVICE=eth0:10
BOOTPROTO=static
IPADDR=192.168.2.10
NETMASK=255.255.255.255
BROADCAST=xxx.xxx.xxx.xxx
ONBOOT=yes

ifup eth0:10

 

What you trying to accomplish ? I never used OVH failover IPs, if you have same A record for same dns record then you'd be doing dns round robin.

 

google'd for docs and read

• OVH : IpFailover
• OVH : IpAlias
  
• Failover IP: hosting without interruptions - OVH

 

indeed you can for CentOS 7 at least Linux Basics: Assign Multiple IP Addresses To Single Network Interface Card On CentOS 7 | Unixmen though trickier to automate like my above for sequence loop if you want to auto insert and create the files

but if you just want to output the line syntax and manually copy and paste with same above example IP range 192.168.2.2 to 192.168.2.10

Code (Text):

for i in {2..10}; do echo "IPADDR${i}=\"192.168.2.${i}\""; done

Output would be

Code (Text):

for i in {2..10}; do echo "IPADDR${i}=\"192.168.2.${i}\""; done

IPADDR2="192.168.2.2"
IPADDR3="192.168.2.3"
IPADDR4="192.168.2.4"
IPADDR5="192.168.2.5"
IPADDR6="192.168.2.6"
IPADDR7="192.168.2.7"
IPADDR8="192.168.2.8"
IPADDR9="192.168.2.9"
IPADDR10="192.168.2.10"

 

Adding or using additional IP addresses is becoming a more common question it seems even in the age of IPv4 shortages So I have written a guide in Centmin Mod Insights forum at https://community.centminmod.com/threads/adding-additional-ip-addresses.11816/. Enjoy