Distributed Replicated Block Device (DRBD) on SME8 ?

Obsolete Releases > SME 8.x Contribs

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newburns:
I'll join with you. But I won't be able to test your howto until later this week.

fpausp:
OK, I have made a new one (v0.2) ...

DRBD is working, what is left is the cib (cluster information base) and the test of the ha-cluster.

SME8 Ha-Drbd Howto v0.2:

--- Code: ---### sme8 ha-drbd howto v0.2 ###

# Preparation, two SME8-Server with additional hdd for drbd:
node1 - sme8test1 - 10.10.10.109
node2 - sme8test2 - 10.10.10.110

### Installation ###

# Install packages (on each node)
yum -y install drbd82 kmod-drbd82 --enablerepo=extras; \
yum -y install heartbeat --enablerepo=extras

# Generate public-key (on each node)
ssh-keygen -t rsa -N "" -f ~/.ssh/id_rsa

# copy the key to the other side on node1 (sme8test1)
ssh-copy-id -i ~/.ssh/id_rsa.pub "root@10.10.10.110 -p 11022"

# copy the key to the other side on node2 (sme8test2)
ssh-copy-id -i ~/.ssh/id_rsa.pub "root@10.10.10.109 -p 11022"

# Test connection on node1 (sme8test1)
ssh -p 11022 root@10.10.10.110

# Test connection on node2 (sme8test2)
ssh -p 11022 root@10.10.10.109

# create template on node1 (sme8test1)
mkdir -p /etc/e-smith/templates-custom/etc/hosts
nano /etc/e-smith/templates-custom/etc/hosts/30hosts

----------------------- content of 30hosts -----------------------
10.10.10.110 sme8test2.mydomain.at sme8test2
----------------------- content of 30hosts -----------------------

# create template on node2 (sme8test2)
mkdir -p /etc/e-smith/templates-custom/etc/hosts
nano /etc/e-smith/templates-custom/etc/hosts/30hosts

----------------------- content of 30hosts -----------------------
10.10.10.109 sme8test1.mydomain.at sme8test1
----------------------- content of 30hosts -----------------------

# expand template (on each node)
/sbin/e-smith/expand-template /etc/hosts

### DRBD Configuration ###

# configure drbd (on each node)

nano /etc/drbd.conf

----------------------- content of drbd.conf -----------------------
resource r0 {
protocol C;

on sme8test1 {
device /dev/drbd1;
disk /dev/vdb1;
address 10.10.10.109:7789;
meta-disk internal;
}
on sme8test2 {
device /dev/drbd1;
disk /dev/vdb1;
address 10.10.10.110:7789;
meta-disk internal;
}
}
----------------------- content of drbd.conf -----------------------

# create a primary partition on the additional hdd (on each node)
fdisk /dev/vdb

# create resource (on each node)
drbdadm create-md r0

# start drbd service (on each node)
/etc/init.d/drbd start

# chose a server as Primary - node1 (sme8test1), and start replication
drbdadm -- --overwrite-data-of-peer primary r0

# temporary speedup replication (680 for virtual lan)
drbdsetup /dev/drbd1 syncer -r 680M

# watch replication (on each node)
cat /proc/drbd

# create mountpoint (on each node)
mkdir -p /media/drbd

# we can now format /dev/drbd1 and mount it on node1 (sme8test1)
mke2fs -j /dev/drbd1 ; mount /dev/drbd1 /media/drbd

# create a testfile on node1 (sme8test1)
touch /media/drbd/testfile-1.txt

# umount drbd on node1 (sme8test1) and make node1 (sme8test1) secondary
umount /media/drbd
drbdadm secondary r0

# make sme8test2 primary and mount drbd on node2 (sme8test2)
drbdadm primary r0
mount /dev/drbd1 /media/drbd

# create a testfile on node2 (sme8test2)
touch /media/drbd/testfile-2.txt

# umount drbd and make sme8sme2 secondary again on node2 (sme8test2)
umount /media/drbd
drbdadm secondary r0

# finaly make sme8test1 primary again and mount drbd on node1 (sme8test1)
drbdadm primary r0
mount /dev/drbd1 /media/drbd

# take a look on node1 (sme8test1) if the two testfiles are there
ls -alih /media/drbd

# make sure that drbd starts on boot (on each node)
ln -s /etc/rc.d/init.d/drbd /etc/rc7.d/K36drbd ; \
ln -s /etc/rc.d/init.d/drbd /etc/rc7.d/S98drbd

# reboot and test if the service start on boot
reboot

### Heartbeat V2 Configuration ###

# Let's configure a simple /etc/ha.d/ha.cf file on node1 (sme8test1)

nano /etc/ha.d/ha.cf

----------------------- content of ha.cf -----------------------
keepalive 2
deadtime 30
warntime 10
initdead 120
bcast eth0
node sme8test1
node sme8test2
crm yes
----------------------- content of ha.cf -----------------------

# Create also the /etc/ha.d/authkeys on node1 (sme8test1)

nano /etc/ha.d/authkeys

----------------------- content of authkeys -----------------------
auth 1
1 sha1 MySecret
----------------------- content of authkeys -----------------------

# give permission 600 on node1 (sme8test1)
chmod 600 /etc/ha.d/authkeys

# start heartbeat service on node1 (sme8test1)
/etc/init.d/heartbeat start

# Replicate now the ha.cf and authkeys to node2 (sme8test2)
scp -P 11022 /etc/ha.d/ha.cf /etc/ha.d/authkeys root@sme8test2:/etc/ha.d/

# start heartbeat service on node2 (sme8test2)
/etc/init.d/heartbeat start

# Verify cluster with crm_mon on node2 (sme8test2)
crm_mon

# create resourcefile on node1 (sme8test1)
nano /var/lib/heartbeat/myCluster.xml

---------------------------- content of myCluster.xml -----------------------------
<primitive id="IP-Addr" class="ocf" type="IPaddr2" provider="heartbeat">
<instance_attributes id="IP-Addr_instance_attrs">
<attributes>
<nvpair id="IP-Addr_target_role" name="target_role" value="started"/>
<nvpair id="2e967596-73fe-444e-82ea-18f61f3848d7" name="ip" value="10.10.10.222"/>
</attributes>
</instance_attributes>
</primitive>
<instance_attributes id="My-DRBD-group_instance_attrs">
<attributes>
<nvpair id="My-DRBD-group_target_role" name="target_role" value="started"/>
</attributes>
</instance_attributes>
<primitive id="DRBD_data" class="heartbeat" type="drbddisk" provider="heartbeat">
<instance_attributes id="DRBD_data_instance_attrs">
<attributes>
<nvpair id="DRBD_data_target_role" name="target_role" value="started"/>
<nvpair id="93d753a8-e69a-4ea5-a73d-ab0d0367f001" name="1" value="/media/drbd"/>
</attributes>
</instance_attributes>
</primitive>
<primitive id="FS_repdata" class="ocf" type="Filesystem" provider="heartbeat">
<instance_attributes id="FS_repdata_instance_attrs">
<attributes>
<nvpair id="FS_repdata_target_role" name="target_role" value="started"/>
<nvpair id="96d659dd-0881-46df-86af-d2ec3854a73f" name="fstype" value="ext3"/>
<nvpair id="8a150609-e5cb-4a75-99af-059ddbfbc635" name="device" value="/dev/drbd1"/>
<nvpair id="de9706e8-7dfb-4505-b623-5f316b1920a3" name="directory" value="/media/drbd"/>
</attributes>
</instance_attributes>
</primitive>
---------------------------- content of myCluster.xml -----------------------------

# add resource to the cluster on node1 (sme8test1)
cibadmin -C -o resources -x /var/lib/heartbeat/myCluster.xml

# make sure that heartbeat starts on boot (on each node)
ln -s /etc/rc.d/init.d/heartbeat /etc/rc7.d/K35heartbeat ; \
ln -s /etc/rc.d/init.d/heartbeat /etc/rc7.d/S99heartbeat

### Test the HA-DRBD Cluster ###

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--- End code ---

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