How to change server allocated IPs
I need someone advice on this... I have two servers with a provider. They emailed me that due to the blocks of IPs being blacklisted (the IPs which are allocated to me also get blacklisted)... they are going to reallocate a new set of IPs to both of my servers. Both servers OS are RedHat 7.3.
Yes, I have received both new set of IPs for each of my server. Now, the question here is:
How do I change the allocated IPs on each of my server? Do I follow the following:
1. Change to the configuration directory
# cd /etc/sysconfig
2. Edit the file network to add/change the GATEWAY.
NETWORKING=yes
HOSTNAME=myserverhostname
GATEWAY=123.456.789.12 (example for old IP)
Can I add a new GATEWAY right below the old one? like:
GATEWAY=987.654.321.12 (example of new IP GATEWAY provided by my provider)
3. Change to the network-scripts directory
# /etc/sysconfig/network-scripts
4. Edit the appropiate ifcfg-<interface> file. An example file:
DEVICE=eth0
BOOTPROTO=static
BROADCAST=123.456.789.255 (example for old IP)
IPADDR=123.456.789.123 (example of allocated old IP)
NETMASK=255.255.255.0
NETWORK=123.456.789.0 (example)
ONBOOT=yes
Can I simple add those new allocated IPs instead of changing my current allocated old IPs in those ifcfg-<interface> files?
5. If necessary change /etc/hosts to reflect any change in IP address
6. If necessary, change /etc/resolv.conf to reflect any change in DNS servers.
7. Restart the networking
# service network restart
or
#/etc/init.d/network restart
My intention is to setup the new set of allocated IPs on both of my servers then update my domain registrar about the change of my domain name servers IPs... then wait for them to propagate througout the internet... maybe a week then do a remove of my old allocated IPs including the old GATEWAY... etc...
Can these be done without any downtime for those sites hosted on my servers as both my servers also run its own DNS server for those domains hosted on the same server.
Many thanks in advance
Kindest regards,
Choon
