Setup pacemaker CentOS cluster with drbd
TAGS:Intro
Always forget this stuff)
Instructions
2 VM with Centos 7
NTP and timezones
yum install ntpdate
crontab -e
0 0 * * * /usr/sbin/ntpdate ru.pool.ntp.org
cp /usr/share/zoneinfo/Europe/Moscow /etc/localtime
ntpdate ru.pool.ntp.org
Firewall
firewall-cmd --permanent --add-service=high-availability
firewall-cmd --permanent --add-port=7788/tcp
firewall-cmd --reload
Packages
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo clean metadata
yum update
yum install pacemaker pcs resource-agents
passwd hacluster
systemctl enable pcsd
systemctl start pcsd
Auth
pcs cluster auth node1 node2 -u hacluster
Cluster setup
pcs cluster setup --force --name NLB node1 node2
pcs cluster enable --all
pcs cluster start --all
Disable stonith and quorum (in case of 2 nodes)
pcs property set stonith-enabled=false
pcs property set no-quorum-policy=ignore
VIP
pcs resource create virtual_ip ocf:heartbeat:IPaddr2 ip=IP cidr_netmask=24 op monitor interval=60s
DRBD packages and modules
yum install kmod-drbd84 drbd84-utils
modprobe drbd
echo drbd > /etc/modules-load.d/drbd.conf
DRBD share
vim /etc/drbd.d/r0.res
resource r0 {
protocol C;
startup {
wfc-timeout 15;
degr-wfc-timeout 40;
}
net {
cram-hmac-alg sha1;
shared-secret "b5eb86aa76a6136";
}
on centos-ansible {
address 10.220.106.83:7788;
device /dev/drbd0;
disk /dev/sdb;
meta-disk internal;
}
on centos-ansible2 {
address 10.220.106.85:7788;
device /dev/drbd0;
disk /dev/sdb;
meta-disk internal;
}
on both
drbdadm create-md r0
on one node:
drbdadm primary testdata1 --force
mkfs
mkfs.ext3 /dev/drbd0
DRBD Pacemaker
pcs cluster cib drbd_cfg
pcs -f drbd_cfg resource create DrbdData ocf:linbit:drbd drbd_resource=testdata1 op monitor interval=60s
pcs -f drbd_cfg resource master DrbdDataClone DrbdData master-max=1 master-node-max=1 clone-max=2 clone-node-max=1 notify=true
pcs cluster cib-push drbd_cfg
DRBD FS
pcs cluster cib fs_cfg
pcs -f fs_cfg resource create DrbdFS Filesystem device="/dev/drbd0" directory="/mnt" fstype="ext3"
pcs -f fs_cfg constraint colocation add DrbdFS with DrbdDataClone INFINITY with-rsc-role=Master
pcs -f fs_cfg constraint order promote DrbdDataClone then start DrbdFS
pcs cluster cib-push fs_cfg
Check
pcs status
Also
pcs resource op defaults timeout=40s (default 20)