Backup and Restore Procedures
Introduction • Performing regular backups should be considered one of a responsible system administrator’s top priorities. • The safest method of doing backups is to record them on separate media, such as tape, writabel CD, DVD etc. , and then store your backup sets in a separate location
Server Backup Procedures • • Comand line tools (dd, dump, cpio, tar. . . ) Text based utilities (Amanda, Taper. . . ) GUI-based utilities (KDAT) Comercial backup utilities (BRU, Perfect. Backup+) • Choose considering the following factors: – Portability – Unatended or automated backups – User-friendliness – Remote Backups – Network Backups – Media Types
Backing up with “tar” • Take time to know the comand line options (“man tar”) • You need to know how to access the apropriate backup media • Example for full sistem backup onto the /archive/ filesystem with the exception of “/proc” , “/mnt” and “/archive” filesystems and without large cache files • #tar -zcvpf /archive/full-backup-`date ‘+%d-%B-%Y’`. tar. gz –directory / -exclude=mnt –exclude=proc –exclude=var/spool/squid • When writting directly to tape do not use compress (-z)
Working with your tape • Use “mt’ to rewind and eject: – mt -f /dev/nst 0 rewind – mt -f /dev/nst 0 offline
Backing up with KDat • If you are using KDE you can use Kdat • Kdat uses tar as engine (!) • User friendly and portable (read from comand line directly with tar) • Create backup profiles (at lest one for full backup and some other for selective/incremental backups) • Mount the tape and perform backups according to profile
Server Restore • Unarguably the one thing that is more important than performing regular backups is having them availamble when you need it • Restore method depends on your backup solution
Restore with “tar” • tar -zxvpf /archive/full-backup-09 -Octomber-1999. tar. gz • If you don’t need to restore all files just specify the one(s) you need • Remember: tar strips leading / !!!
Restore with “KDat” • Using kdat just mount the tape and select apropriate options • Use “tar” to restore. . .
Cisco router configuration Backups • Via tftp • Enable tftp service on a directly connected server • Remembre to set permisions to write and restrict afterwards • Just “write network” from the router prompt and respond with your tftp server details • To restore, you might need to access via console (if you cannot telnet into the router) and after seting up the link use “config network”
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