Update Kernel for DRBD Hosts

Steps to update kernel for servers that are using DRBD for their Disks

In this example, the DRBD hosts are running MySQL Services.

PRIMARY DRBD

BEFORE UPDATE

systemctl stop mysqld
umount /var/lib/mysql
drbdadm secondary drbd0
reboot

AFTER UPDATE

cd /ips1/drbd
wget http://www.linbit.com/downloads/drbd/9.0/drbd-9.0.14-1.tar.gz
tar xvf drbd-9.0.14-1.tar.gz
cd drbd-9.0.14-1
make make install
modprobe drbd
systemctl start drbd
drbdadm primary drbd0
mount /dev/drbd0 /var/lib/mysql
systemctl start mysqld

SECONDARY DRBD

yum update kernel kernel-devel 
reboot

AFTER UPDATE

cd /ips1/drbd
wget http://www.linbit.com/downloads/drbd/9.0/drbd-9.0.14-1.tar.gz
tar xvf drbd-9.0.14-1.tar.gz
cd drbd-9.0.14-1
make make install
modprobe drbd
systemctl start drbd