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Old 03-11-2015, 11:11 AM   #1
bangnagr
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Registered: Jan 2013
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How to change IP address of remote machine?


Hi all

This is bothering me too much, please tell me how to change IP address of remote machine while using ssh successfully.

I follow these steps:
1. connect to remote server using 'ssh root@server'
2. Edit '/etc/sysconfig/network-scripts/ifcfg-eth0' file
3. issue 'service network restart' command... (at this point ssh connection gets hanged)
4. Break from hanged ssh connection (<ENTER>~.)
5. Wait for some time to let service restart
6. Then finally, ssh with new ip address.

All is fine, but last time, i did something wrong while assigning new IP address, and after service restart, remote server didn't get new ip address - and now i cant connect to remote server.

Fortunately, i had a friend there, who helped me correct the problem so that i can connect again.

But what to do when there is no one to help? Is there other way i should approach this problem?

Thanks
 
Old 03-11-2015, 11:17 AM   #2
suicidaleggroll
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If your server includes IPMI you could use that as a back-door to access the system when it has no network access. Or if your system has two NICs you could wire them both up with different IP addresses, so if you break one you can still connect on the other.

Otherwise, yeah, if you screw up the config and bring down the network on the system, you can't connect over the network anymore. I suppose you could implement a little script to babysit things while you try to reconnect. So instead of modifying the config by hand, instead you invoke a script which makes a backup of the existing config, opens up the config for you to edit, and when you're done it issues a network restart, sleeps for 60 seconds, restores the backup, and issues a network restart again. Then it's up to you to reconnect within 60 seconds and kill the script, otherwise the settings will revert to their previous values.

Last edited by suicidaleggroll; 03-11-2015 at 11:20 AM.
 
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Old 03-11-2015, 02:42 PM   #3
TenTenths
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Assign new IPs as aliases of the relevant adaptor first (e.g. as eth0:0) and test it. Only when you're happy then switch the new IP to eth0 and the old (current) IP to eth0:0

Or always have iLO/DRAC configured
 
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Old 03-12-2015, 02:45 AM   #4
bangnagr
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Thank you @suicidaleggroll and @TenTenths, I tried both. Thanks. I better be careful next time...
 
  


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