Tuesday, July 13, 2010

Centralized Backup Server With Amanda On CentOS

Category: , — SkyHi @ Tuesday, July 13, 2010

This document describes how to set up a centralized network backup with Amanda. We will use virtual tape to store the backup.


In my environment, I have 2 Linux servers that I want to backup.


192.168.20.200 (Alpha) : /home/kulathep


192.168.20.201 (Beta) : /data and /var


I am going to build a new server with Amanda as a centralized backup server.


192.168.20.202 (Gamma)


Setup Server (Gamma)


1. Install Amanda with yum:


yum -y install amanda*


2. Edit Amanda conf in xinetd.d:


vi /etc/xinetd.d/amanda

vi /etc/xinetd.d/amandaidx

vi /etc/xinetd.d/amidxtape


Change Disable = yes to Disable = no.


3. Copy Amanda conf files:


cp -r /etc/amanda/DailySet1 /etc/amanda/intra


4. Edit amanda.conf:


vi /etc/amanda/intra/amanda.conf


org “Configuration name”

mailto “email”

netusage 600 Kbps


dumpcycle 2 weeks

runspercycle 10

tapecycle 15 tapes


#tpchanger “chg-manual”

tpchanger “chg-disk”


changerfile “/etc/amanda/intra/changer”


#tapedev “null:”

tapedev “file:/backup/intra/slots”


#tapetype HP-DAT

#labelstr “^DailySet1-[0-9][0-9]*$”


tapetype HARDDISK

define tapetype HARDDISK {

comment “Backup to Virtual Tape”

length 3072 mbytes # each tape is 3 Gigs

}


# amrecover_changer “null:”

amrecover_changer “changer”


#infofile “/etc/amanda/DailySet1/curinfo” # database DIRECTORY

#logdir “/etc/amanda/ DailySet1″ # log directory

#indexdir “/etc/amanda/ DailySet1/index” # index directory

infofile “/var/log/amanda/intra/curinfo” # database DIRECTORY

logdir “/var/log/amanda/intra” # log directory

indexdir “/var/log/amanda/intra/index” # index directory


With this configuration, Amanda will do a full backup every 2 weeks, and an incremental backup every week day. The backup will be stored and rotated on 15 virtual tapes.


5. Edit disklist (tell Amanda which servers, directory to backup, what dumptype to use).


vi /etc/amanda/intra/disklist


Remove every lines including “localhost /etc comp-root-tar” at the end of the file. And add:


alpha /home/kulathep comp-user-tar

beta /data comp-user-tar

beta /var comp-user-tar


Note: See amanda.conf for the dumptype.


6. Edit hosts file:


vi /etc/hosts


Add:


192.168.20.200 alpha

192.168.20.201 beta


7. Create backup directory (we will store the backup here):


mkdir -p -m 770 /backup/intra/slots

chown -R amanda:disk /backup


8. Create tape list:


touch /etc/amanda/intra/tapelist

chown –R amanda:disk /etc/amanda/intra


9. Create slots (virtual tapes):


su - amanda

cd /backup/intra/slots

for ((i=1; $i<=15; i++)); do mkdir slot$i; done

ln -s slot1 data


10. Test virtual tapes:


/usr/sbin/ammt -f file:/backup/intra/slots status


11. Label the virtual tapes:


for ((i=1; $i<=15; i++)); do /usr/sbin/amlabel intra intra-$i slot $i; done


12. Reset the tape:


/usr/sbin/amtape intra reset


13. Edit .amandahosts to allow communications from clients:


vi /var/lib/amanda/.amandahosts


alpha amanda

beta amanda

gamma amanda


14. Start xinetd service:


su –

service xinetd start


15. Check amanda process:


lsof | grep amanda


Set Up Client


1. Install amanda client with yum:


yum -y install amanda-client


2. Edit file .amandahosts to allow communications from server:


vi /var/lib/amanda/.amandahosts


gamma amanda


3. Edit xinetd.d:


vi /etc/xinetd.d/amanda


Disable = no


4. Start xinetd:


service xinetd start


5. Check Amanda service:


lsof | grep amanda


Backup Data


1. Check tapes and clients on server:


su - amanda

/usr/sbin/amcheck intra


2. Dump manually:


/usr/sbin/amdump intra


3. Add amdump to cron:


crontab –e


0 16 * * 1-5 /usr/sbin/amcheck -m intra

45 0 * * 2-6 /usr/sbin/amdump intra


The first line checks the tape/clients and sends an email if it found something wrong (no email if everything is okay) at 4pm.


The second line dumps at 12.45am on weekdays.


Restore Data


1. Prepare tapes:


cd /tmp

/usr/sbin/amtape intra slot 1 # select slot1 (tape1)

/usr/sbin/ammt -t file:/backup/intra/slots rewind # rewind


2.1. Restore everything from every server:


/usr/sbin/amrestore file:/backup/intra/slots


2.2. Restore only a server and a directory:


/usr/sbin/amrestore file:/backup/intra/slots beta /var


3. Extract:


tar xvf <Restored files>



REFERENCES
http://redhatvn.net/centralized-backup-server-with-amanda-on-centos