How do update node IP addresses?

jimwu · March 11, 2021, 9:58pm

I set up a cluster recently with the default public IPs for all nodes. Our IT has since helped set up a private network connecting all nodes. What is the best way to update the IP addresses for all nodes to new private IP addresses?

jimwu · March 12, 2021, 4:59pm

I created a simple script to do this. It 99% percent works except for gadmin config command. Here is the script in case it helps other.

github.com

jimw567/toolbox/blob/main/tg_update_node_ips.py

#!/usr/bin/env python3

# -*- coding: utf-8 -*-

import subprocess
import json
import sys


new_ip_json = sys.argv[1]

command = 'gadmin config dump'
p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True)
p_out = p.stdout.read().decode('utf-8')
p_returncode = p.wait()
if p_returncode != 0:
    print(p_out)

config_dict = json.loads(p_out)
print('INFO: Current cluster node IP configuration:')

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jimwu · March 12, 2021, 7:52pm

Changing IPs via gadmin config command is not gonna cut it. Spent the whole morning trying to get all services to use the new IPs and failed. Picked the wrong battle . Had to nuke the entire installation and start from sratch.