You can use the steps below if you need to change managed IP resources, for example, if you need to re-IP your RHEL OSP Overcloud endpoints.
In this example, we are changing a managed VIP from one IP to another.
First, we get a good look at the resource that we want to delete. Here we are going to delete the resource ip-126.96.36.199. This resource starts the VIP, 188.8.131.52.
# pcs resource show ip-184.108.40.206
Resource: ip-220.127.116.11 (class=ocf provider=heartbeat type=IPaddr2)
Attributes: ip=18.104.22.168 cidr_netmask=32
Operations: start interval=0s timeout=20s (ip-22.214.171.124-start-interval-0s)
stop interval=0s timeout=20s (ip-126.96.36.199-stop-interval-0s)
monitor interval=10s timeout=20s (ip-188.8.131.52-monitor-interval-10s)
Now let’s actually delete it.
# pcs resource delete ip-184.108.40.206
Attempting to stop: ip-220.127.116.11…Stopped
Now lets create the replacement VIP
# pcs resource create ip-18.104.22.168 ocf:heartbeat:IPaddr2 ip=22.214.171.124 cidr_netmask=32 op monitor interval=10s
Now, let’s take a good look at it.
# pcs resource show ip-126.96.36.199
Resource: ip-188.8.131.52 (class=ocf provider=heartbeat type=IPaddr2)
Attributes: ip=184.108.40.206 cidr_netmask=32
Operations: start interval=0s timeout=20s (ip-220.127.116.11-start-interval-0s)
stop interval=0s timeout=20s (ip-18.104.22.168-stop-interval-0s)
monitor interval=10s (ip-22.214.171.124-monitor-interval-10s)
Now we need to check to make sure that the VIP started on one of our OpenStack controllers.
# pcs status | grep 126.96.36.199
ip-188.8.131.52 (ocf::heartbeat:IPaddr2): Started ctrl01
For good measure, let’s make sure we can ping it.
# ping 184.108.40.206
PING 220.127.116.11 (18.104.22.168) 56(84) bytes of data.
64 bytes from 22.214.171.124: icmp_seq=1 ttl=64 time=0.781 ms
64 bytes from 126.96.36.199: icmp_seq=2 ttl=64 time=1.21 ms