Backing Up Filesystems on J-Series Routers

Problem

You are preparing to load a different release of the JUNOS software or reload the current release on a J-series router and you want to save the files that are already on the router.

Solution

On any J-series router, back up the filesystem to a device that is connected to the router's USB port:

	aviva@RouterA> request system snapshot media usb

On J4300 and J6300 routers, you can also back up the files in the router's filesystem to a removable compact flash disk:

	aviva@RouterA> request system snapshot media removable-compact-flash

Before installing the software upgrade, delete old log- and crashfiles:

	aviva@RouterA> request system storage cleanup

 

Discussion

The snapshot process on J-series routers differs from the process for M-series and T-series routers because of hardware differences. You can place a snapshot of the J-series filesystems on a device connected to the router's USB port or, for J4300 and J6300 routers, on a removable compact flash disk.

You can take a snapshot of the software at any time, but you should always do so before installing a new JUNOS software version so that you can recover to a known, stable environment in case something goes wrong when you load the software. You should also always take a snapshot after you have successfully loaded a new version of the software.

Before installing a new software package, you can use the request system storage cleanup command to remove older files to free up space in the filesystem. This command deletes any rotating logfiles in /cf/var/log that are not current files in /cf/var/tmp that have not been modified in the last two days and all crashfiles in /cf/var/crash. Before you delete files in the directories, you can use the file list command to check what they contain:

	aviva@RouterA> file list detail /cf/var/tmp
	/cf/var/tmp:
	total 28
	-rw-r--r-- 1 root wheel 6379 Nov 3 00:10 cleanup-pkgs.log
	drwxrwxrwx 2 root wheel 512 Apr 15 2005 install/
	-rw-r----- 1 root wheel 2492 Nov 3 00:10 sampled.pkts

	aviva@RouterA> file list detail /cf/var/log/messages*
	-rw-rw-r-- 1 root wheel 65 Nov 3 00:06 /cf/var/log/messages
	-rw-rw---- 1 root wheel 2587 Nov 3 00:06 /cf/var/log/messages.0.gz
	-rw-rw-r-- 1 root wheel 21746 Apr 16 2005 /cf/var/log/messages.1.gz
	-rw-rw---- 1 root wheel 12381 Dec 9 2004 /cf/var/log/messages.10.gz
	-rw-rw-r-- 1 root wheel 11066 Apr 9 2005 /cf/var/log/messages.2.gz
	-rw-rw-r-- 1 root wheel 12844 Feb 24 2005 /cf/var/log/messages.3.gz
	-rw-rw-r-- 1 root wheel 8751 Feb 18 2005 /cf/var/log/messages.4.gz
	-rw-rw---- 1 root wheel 12280 Feb 17 2005 /cf/var/log/messages.5.gz
	-rw-rw---- 1 root wheel 11486 Feb 10 2005 /cf/var/log/messages.6.gz
	-rw-rw---- 1 root wheel 44407 Feb 8 2005 /cf/var/log/messages.7.gz
	-rw-rw---- 1 root wheel 22260 Dec 10 2004 /cf/var/log/messages.8.gz
	-rw-rw---- 1 root wheel 18618 Dec 9 2004 /cf/var/log/messages.9.gz
	total 12

The show log command is another way to find out when logfiles were last modified:

	aiva@RouterA> show log
	 messages Size: 65, Last changed: Nov 03 00:06:10
	 messages.0.gz Size: 2587, Last changed: Nov 03 00:06:10
	 messages.1.gz Size: 21746, Last changed: Apr 16 2005
	 messages.10.gz Size: 12381, Last changed: Dec 09 2004
	 messages.2.gz Size: 11066, Last changed: Apr 09 2005
	 messages.3.gz Size: 12844, Last changed: Feb 24 2005
	 messages.4.gz Size: 8751, Last changed: Feb 18 2005
	 messages.5.gz Size: 12280, Last changed: Feb 17 2005
	 messages.6.gz Size: 11486, Last changed: Feb 10 2005
	 messages.7.gz Size: 44407, Last changed: Feb 08 2005
	 messages.8.gz Size: 22260, Last changed: Dec 10 2004
	 messages.9.gz Size: 18618, Last changed: Dec 09 2004

 

See Also

Recipe 1.19


Router Configuration and File Management

Basic Router Security and Access Control

IPSec

SNMP

Logging

NTP

Router Interfaces

IP Routing

Routing Policy and Firewall Filters

RIP

IS-IS

OSPF

BGP

MPLS

VPNs

IP Multicast



JUNOS Cookbook
Junos Cookbook (Cookbooks (OReilly))
ISBN: 0596100140
EAN: 2147483647
Year: 2007
Pages: 290
Authors: Aviva Garrett

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