changing ip and host name of running vertica cluster. Moved cluster to a new site

Mapping New IP Addresses: https://www.vertica.com/docs/9.2.x/HTML/Content/Authoring/AdministratorsGuide/ManageNodes/ReMapIPs/ReMapIPOverview.htm

For running "admintools -t re_ip -f re_map.txt" with mapping of old to new ip address, do I need to have the passwordless setting as pre-requisite between the nodes or from the machine I am running the command?
I have one fundamental doubt , the old ips are no more valid for my current system since they have been changed to new IPs already in network setting. Of course, Old IPs are still present in all the vertica configuration file like admintools.conf,config.cat and spread.conf. This is again replicated in 3 nodes.
I was under assumption that, this "admintools -t re_ip -f re_map.txt" will go and change the configuration file automatically . In fact, this worked for me earlier in a different setup.
Any help in troubleshooting this issue will be greatly appreciated, as I am stuck in debugging this issue. At least, I want to reassure that I have understood this tool properly.

Hi,

I am waiting for the response as this is a nice solution which I see in my solution case. In fact, it worked for me on some old setup but this time I am having issue in a new setup.
Does it have some internal communication dependencies? Do I need to check some internal communication setting? or passwordless setup etc?
This is my case,
We have 2 sites ( 1- DC ( Active), 2 DR- (Passive) ). My application will be talking to active site only. However, the vertica cluster nodes are copied over to passive site using vmware storage level copy in 15 minutes interval.
Which means, if I want to switch my traffic to DR environment , then I need to change the passive to active mode for DR. In that case, I need to bring the vertica cluster in DR which is in a different network.
I changed the network interfaces of all the 3 nodes and used the "admintool -t re_ip -f <oldip-newip-mapped. file> for all the configuration change required for ip.
I believe it should work.

Please advise, as I am stuck at some point and not able to move.

Regards,
SM

Thanks for the detailed response. I was completely wrong in my assumption about the remapping of ip concept. I haven't touched the
admintool.conf file this time. let me check my luck this time

Cheers,
SM

Hi Expert,
I was wondering how the remapping worked for me in my test lab , when I didn't have access to old ip set. It just worked, although as you mentioned it took long time to recover the node with changed address.
I believe the process is like this , just need clarification.
1- just read the map file.
2- ssh to the respective nodes from the host we run admintool and connect to other hosts for update.
3- It takes backup file and update file with new ip address set in admintoo.conf and spread.conf
4- Once that is done, it tried to recover the server or start using new IP . I just see these states ( 1- Preparing , Prepared and then Out of date and finalled rollback)

Please suggest.

For me it's failing in one of customer setup,
2020-08-09 13:37:03.618 admintools/18909:0x7f8b4b4ef740 [NodeState.transition] v_dummy_node0001=Preparing -> v_dummy_node0001=Prepared
2020-08-09 13:37:03.618 admintools/18909:0x7f8b4b4ef740 [NodeState.transition] v_dummy_node0002=Preparing -> v_dummy_node0002=Prepared
2020-08-09 13:37:03.618 admintools/18909:0x7f8b4b4ef740 [NodeState.transition] v_dummy_node0003=Preparing -> v_dummy_node0003=Prepared
2020-08-09 13:37:03.618 admintools/18909:0x7f8b4b4ef740 [NodeState.transition] v_dummy_node0002=Prepared -> v_dummy_node0002=OutOfDate
2020-08-09 13:37:03.618 admintools/18909:0x7f8b4b4ef740 [NodeState.transition] v_dummy_node0003=Prepared -> v_dummy_node0003=OutOfDate
2020-08-09 13:37:03.618 admintools/18909:0x7f8b4b4ef740 [NodeState.transition] v_dummy_node0001=Prepared -> v_dummy_node0001=RollingBack
2020-08-09 13:37:03.618 admintools/18909:0x7f8b4b4ef740 [NodeState.transition] v_dummy_node0002=OutOfDate -> v_dummy_node0002=RollingBack
2020-08-09 13:37:03.618 admintools/18909:0x7f8b4b4ef740 [NodeState.transition] v_dummy_node0003=OutOfDate -> v_dummy_node0003=RollingBack

Thanks in advance,
Regards,
SM