NBServerMigrator Update: Rename operation - how to check the container ID for a Flex Instance

Description

Steps to check the container ID of Flex Instance:

1. Login to the Flex host.
2. go to elevate mode:
   support elevate
3. run: docker ps
   Example:
   [user@servername /]# docker ps
CONTAINER ID  IMAGE                                          COMMAND               CREATED         STATUS                   PORTS                                                       NAMES
f9aa0df7f6fc  localhost/veritas/appliance/autosupport:5.0.0  /sbin/init            11 days ago     Up 11 days (healthy)                                                                 autosupport
3c5dea5e0557  localhost/veritas/appliance/svc/auth:5.0.0                           11 days ago     Up 11 days (healthy)                                                                 authservice
.
.
.
a9d835b1cac4  flex.io/netbackup/main:10.4                    /sbin/init            3 days ago      Up 3 days (unhealthy)                                                                imTxP_10-4
76aaf6b62f1c  flex.io/netbackup/main:10.4                    /sbin/init            41 minutes ago  Up 41 minutes (healthy)                                                              iFKjQ_10-4
[user@servername /]#

4. Login For "Image" values where "netbackup" is mentioned, note down the container id.

5. run the command: docker ps exec -it <container_id> /usr/openv/netbackup/bin/bpclntcmd -pn
   example:
   docker exec -it 76aaf6b62f1c /usr/openv/netbackup/bin/bpclntcmd -pn
   expecting response from server primary_server_hostname
primary_server_hostname primary_server_hostname 10.xx.xx.xx <post_no>

6. Identify if the primary_server_hostname returned here is the primary server where the rename is required to be run.