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1 Elastix High Availability ( DRBD + Heartbeat ) ============================================== this is How to configure Documentation :) ============================================== Before we Start : the same partitioning configuration in two Nodes ( DRBD Partition to be with SID 83) 2- adding the server nodes in the /etc/hosts 3- yum update -y 4- in this doc we assume that the DRBD Partition is /dev/sda4 so we need to : # mk2fs -j /dev/sda4 5- delete the file system for that partition: # dd if=/dev/zero bs=1m count=500 of=/dev/sda4; sync ============================================== 1- Installing & Configuring DRBD: # yum install heartbeat drbd83 kmod-drbd paste the below in /etc/drbd.conf global { usage-count no; } resource r0 { protocol C; startup { wfc-timeout 10; degr-wfc-timeout 30; } #change timers to your need disk { on-io-error detach; } # or panic,... net { after-sb-0pri discard-least-changes; after-sb-1pri discard-secondary; after-sb-2pri call-pri-lost-after-sb;

2 cram-hmac-alg "sha1"; shared-secret "Cent0Sru!3z"; } syncer { rate 5M; } on node1.server.local { device /dev/drbd0; disk /dev/sda4; address :7788; meta-disk internal; } on node2.server.local { device /dev/drbd0; disk /dev/sda4; address :7788; meta-disk internal; } } Note : the below parameters are used for split brain auto-recovery: after-sb-0pri discard-least-changes; after-sb-1pri discard-secondary; after-sb-2pri call-pri-lost-after-sb; 3- Replicate the drbd.conf to the second server # scp /etc/drbd.conf root@node2.server.local:/etc/ 4- Intialize the meta-data on disk before starting the drbd service ( must do on two nodes) # drbdadm create-md r0

3 5- Start the DRBD Service # service drbd start 5- Verify the two Servres are playing the secondary role ( it is normal and we will specify the primary after this step ) # cat /proc/drbd 6- Specify the primary node: ( on node1.server.local ) # drbdadm -- --overwrite-data-of-peer primary r0 7- Launch the sync and wait till it is finished ( on two nodes ): # watch -n 1 cat /proc/drbd 8- Now we can format the /dev/drbd0 and mount it on node1.server.local # mkfs.ext3 /dev/drbd0 # mkdir /replica # mount /dev/drbd0 /replica to check the server role : # drbdadm role r Now we will copy all configuration files and Directories and Synchronize it in the drbd partition: # cd /replica # amportal chown # tar -zcvf etc-asterisk.tgz /etc/asterisk # tar -zxvf etc-asterisk.tgz # tar -zcvf var-lib-asterisk.tgz /var/lib/asterisk # tar -zxvf var-lib-asterisk.tgz # tar -zcvf usr-lib-asterisk.tgz /usr/lib/asterisk/

4 # tar -zcvf var- /var/www/ # tar -zxvf usr-lib-asterisk.tgz # tar -zcvf var-spool-asterisk.tgz /var/spool/asterisk/ # tar -zxvf var-spool-asterisk.tgz # tar -zcvf var-lib-mysql.tgz /var/lib/mysql/ # tar -zxvf var-lib-mysql.tgz # tar -zcvf var-log-asterisk.tgz /var/log/asterisk/ # tar -zxvf var-log-asterisk.tgz # tar -zxvf var- # rm -rf /etc/asterisk # rm -rf /var/lib/asterisk # rm -rf /usr/lib/asterisk/ # rm -rf /var/spool/asterisk # rm -rf /var/www # rm -rf /var/lib/mysql/ # rm -rf /var/log/asterisk/ # ln -s /replica/etc/asterisk/ /etc/asterisk # ln -s /replica/var/lib/asterisk/ /var/lib/asterisk # ln -s /replica/usr/lib/asterisk/ /usr/lib/asterisk # ln -s /replica/var/spool/asterisk/ /var/spool/asterisk # ln -s /replica/var/lib/mysql/ /var/lib/mysql # ln -s /replica/var/log/asterisk/ /var/log/asterisk # ln -s /replica/var/www /var/www # cd / Stop all Services: # service mysqld restart # service mysqld stop # service asterisk stop

5 # service httpd stop # service elastix-updaterd stop # service elastix-portknock stop unmount /replica and switch to the second node: # umount /replica ; drbdadm secondary r0-13- on the Second Node just to verify the replication is done then copy all the configuration files and Directories: # mkdir /replica ; drbdadm primary r0 ; mount /dev/drbd0 /replica # ls /replica/ # rm -rf /etc/asterisk # rm -rf /var/lib/asterisk # rm -rf /usr/lib/asterisk/ # rm -rf /var/spool/asterisk # rm -rf /var/lib/mysql/ # rm -rf /var/log/asterisk/ # rm -rf /var/www # ln -s /replica/etc/asterisk/ /etc/asterisk # ln -s /replica/var/lib/asterisk/ /var/lib/asterisk # ln -s /replica/usr/lib/asterisk/ /usr/lib/asterisk # ln -s /replica/var/spool/asterisk/ /var/spool/asterisk # ln -s /replica/var/lib/mysql/ /var/lib/mysql # ln -s /replica/var/log/asterisk/ /var/log/asterisk # ln -s /replica/var/www /var/www Stop all Services: # service mysqld restart # service mysqld stop

6 # service asterisk stop # service httpd stop # service elastix-updaterd stop # service elastix-portknock stop Now convert it to be Secondary Node as it was before: # umount /replica/ ; drbdadm secondary r0-15- on the node1.server.local convert it to be primary and check: # drbdadm primary r0 ; mount /dev/drbd0 /replica # drbdadm role r0 # df -h make te drbd service is starting on boot ( on both nodes ): # chkconfig drbd on ===================================================== 2- Confguring Heatbeat Service ( on both Nodes ): Stop all Services as the heartbeat will be responsible for starting all Services: # chkconfig asterisk off # chkconfig mysqld off # chkconfig httpd off # chkconfig elastix-updaterd off # chkconfig elastix-portknock off # service mysqld stop # service asterisk stop # service httpd stop # service elastix-portknock stop # service elastix-updaterd stop

7 Create /etc/ha.d/ha.cf and paste the below : debugfile /var/log/ha-debug logfile /var/log/ha-log logfacility local0 keepalive 2 deadtime 30 warntime 10 initdead 120 udpport 694 bcast eth0 auto_failback off node node1.server.local node node2.server.local Create /etc/ha.d/authkeys and paste the below : auth 1 1 sha1 MySecret Specify the Permission of the /etc/ha.d/authkeys # chmod 600 /etc/ha.d/authkeys Create /etc/ha.d/haresources and paste the below: node1.server.local drbddisk::r0 Filesystem::/dev/drbd0::/replica::ext4 IPaddr:: /24/eth0/ mysqld asterisk httpd elastix-updaterd elastix-portknock node1.server.local MailTo::alyragab70@gmail.com,root@node1.server.local::DRBD/HA-ALERT Replicate the Heartbeat config files on the second node: # scp /etc/ha.d/ha.cf /etc/ha.d/authkeys /etc/ha.d/haresources root@node2.server.local:/etc/ha.d/

8 Restart the heartbeat Service (on both Nodes ): # service heartbeat start # chkconfig --add heartbeat # chkconfig heartbeat on ========================================================== 3- Troubleshooting and Reference Links: