More Related Content Similar to An High Available Database for OpenStack Cloud Production by Pacemaker, Corosync & DRBD (20) An High Available Database for OpenStack Cloud Production by Pacemaker, Corosync & DRBD1. An High Available Database
for OpenStack Cloud Production
by Pacemaker, Corosync & DRBD
@j3ffyang, Jeffrey Yang, OpenStack Dev, IBM
OpenStack Summit, Atlanta, 2014
2. Technical Objective
●
Database high availability (active - passive)
●
Data persistence (drbd)
●
MySQLd monitored (corosync)
●
IP address floating when failure occurs
(pacemaker)
4. Sample Configurations
[root@host10 corosync]# cat corosync.conf
...
totem {
version: 2
token: 10000 # 10 seconds
token_retransmits_before_loss_const: 10
secauth: on
threads: 0
interface {
ringnumber: 0
bindnetaddr:10.10.203.0
mcastaddr: 226.94.1.1
mcastport: 5405
ttl: 1
}
}
logging {
fileline: off
to_stderr: no
to_logfile: yes
to_syslog: yes
logfile: /var/log/cluster/corosync.log
debug: off
timestamp: on
logger_subsys {
subsys: AMF
debug: off
}
}
...
service {
ver: 0
name: pacemaker
use_mgmtd: yes
}
[root@host10 corosync]# crm configure edit
node host10
attributes standby="off"
node host20
attributes standby="off"
primitive drbd_mysql ocf:linbit:drbd
params drbd_resource="mysql"
op monitor interval="29s" role="Master"
op monitor interval="31s" role="Slave"
primitive fs_mysql ocf:heartbeat:Filesystem
params device="/dev/drbd1" directory="/opt/drbd/" fstype="ext4"
primitive ip_mysql ocf:heartbeat:IPaddr2
params ip="10.10.203.19" nic="eth3"
primitive mysqld lsb:mysqld
group mysql fs_mysql ip_mysql mysqld
ms ms_drbd_mysql drbd_mysql
meta master-max="1" master-node-max="1" clone-max="2" clone-node-max="1"
notify="true"
colocation mysql_on_drbd inf: mysql ms_drbd_mysql:Master
order mysql_after_drbd inf: ms_drbd_mysql:promote mysql:start
property $id="cib-bootstrap-options"
dc-version="1.1.7-6.el6-148fccfd5985c5590cc601123c6c16e966b85d14"
cluster-infrastructure="openais"
expected-quorum-votes="2"
stonith-enabled="false"
5. Demo
●
Captured from a production environment at
one of IBM customers
●
https://www.youtube.com/watch?v=UEln0TUU
aH8