Junos OS

Hi everyone,

 

Is there a way we can have same copy of JUNOS in back up partition as we have in Primary partition?

Background:

we have EX4200 in Virtual chassis, with two members, we had a power issue but when power came up, Virtula chassis was  broken  because switches were booted from back up partition which had different JUNOS version.

 

Thanks,

 

Yes, use the system snapshot command after you’ve booted into the correct version on both members.

request system snapshot slice alternate

You can also configure the auto snapshot option that will keep the snapshots in sync as the configuration changes.

 

https://www.juniper.net/documentation/en_US/junos12.3/topics/reference/configuration-statement/auto-snapshot-edit-system.html

 

Hi Spuluka.

 

I Just want to confirm my understanding is correct

set system auto-snapshot.

The above command will perform followings:

 

1) When even there is a change in the config,  alt config folder gets updated. 

2)  If some reason, router boots up from Secondary , then command also overwrite root and config folders with the contents of alt root and alt config.

 

The link you have provided does not say anything about (1).   I am assuming but this is how it works eventhough link does not say anything it.

 

Also when we use set system auto-snapshot, does it also copies JUNOS packages from /root to ALT/root ? or do we have to use request system snapshot?

 

Appreciated all the help!!

 

The operational command

show system auto-snapshot

 

Will list separately if the configuration and system snapshots are engaged on the platform.

I am not sure which platforms and versions engage both.

 

Auto-snapshot simply rewrites the secondary partition with the new primary in the event of a failed boot and saves you the trouble of having to do it manually. There is no alt configuration partition -- /var and /config are shared by the two roots.

 

 

https://www.juniper.net/documentation/en_US/junos/topics/concept/switch-resilient-dual-root-partitions.html

 

Thanks,

 

So on SRX 650, when I run the command show system auto-snapshot, I see:

 

Auto-snapshot configuration Enabled

Auto -snapshot State: Disabled

 

What about JUNOS? Is it not backed up?

Thanks

 

 

 

 

 

That simply means auto-snapshot is neither in progress nor been executed in the past.

 

https://www.juniper.net/documentation/en_US/junos/topics/reference/command-summary/show-system-auto-snapshot.html