Installing and Configuring Openfiler with DRBD and Heartbeat - Page 2
Configure LVM Partition
Create the /dev/drbd1 as a PV (Physical Volume) for the data volume group, which will be used to create Logical Volumes for data.
First, edit /etc/lvm/lvm.conf and modify the filter line:
filter = [ "a/.*/" ]
filter = [ "r|/dev/sda5|" ]
Note: Change /dev/sda5 to reflect the partition of your LVM. Also remember to apply these changes on both filer01 and filer02.
Create the LVM Physical Volume (only do this on our Primary node, as it will replicate to the Second node via drbd):
root@filer1 /# pvcreate /dev/drbd1
Physical volume "/dev/drbd1" successfully created
As mentioned before, Heartbeat controls failover between hosts. The two nodes run the Heartbeat service, that sends out a heartbeat pulse on the secondary interface (eth1). If one node dies, then Heartbeat detects this and roles the surviving node to Primary (if it wasn't already) using startup scripts available in /etc/ha.d/resources.d.
Make modifications to /etc/ha.d/ha.cf and /etc/ha.d/authkeys. Make these changes on both nodes.
In /etc/ha.d/authkeys, add:
auth 2 2 crc
The /etc/ha.d/authkeys file may not exist and will need to be created, as it does not appear to exist in Openfiler 2.3.
Next, restrict permissions to authkeys to just "root":
root@filer01 ~# chmod 600 /etc/ha.d/authkeys
Create a /etc/ha.d/ha.cf on both nodes (needs to be identical on both, just like /etc/drbd.conf):
debugfile /var/log/ha-debug logfile /var/log/ha-log logfacility local0 bcast eth1 keepalive 5 warntime 10 deadtime 120 initdead 120 udpport 694 auto_failback off node filer01 node filer02
Enable Heartbeat to startup at boot:
root@filer01 ~# chkconfig --level 2345 heartbeat on
Openfiler Data Configuration
As mentioned above, a 512 MB partition was created to keep the configuration and HA services available during a failover. To get this working, copy the services and Openfiler configuration data over to the new partition - symbolically linking it back to it's original location.
root@filer01 ~# mkdir /cluster_metadata
Then edit our /opt/openfiler.local/etc/rsync.xml file:
<?xml version="1.0" ?> <rsync> <remote hostname="10.188.188.2"/> ## IP address of peer node. <item path="/etc/ha.d/haresources"/> <item path="/etc/ha.d/ha.cf"/> <item path="/etc/ldap.conf"/> <item path="/etc/openldap/ldap.conf"/> <item path="/etc/ldap.secret"/> <item path="/etc/nsswitch.conf"/> <item path="/etc/krb5.conf"/> </rsync>
root@filer01 ~# mkdir -p /cluster_metadata/etc/httpd/conf.d
root@filer2 ~# mkdir /cluster_metadata
Change the /opt/openfiler.local/etc/rsync.xml to reflect below:
<?xml version="1.0" ?> <rsync> <remote hostname="10.188.1881"/> ## IP address of peer node. <item path="/etc/ha.d/haresources"/> <item path="/etc/ha.d/ha.cf"/> <item path="/etc/ldap.conf"/> <item path="/etc/openldap/ldap.conf"/> <item path="/etc/ldap.secret"/> <item path="/etc/nsswitch.conf"/> <item path="/etc/krb5.conf"/> </rsync>
Heartbeat Cluster Configuration
Then modify the /cluster_metadata/opt/openfiler/etc/cluster.xml config file. This config file generates the /etc/ha.d/haresources file, which tells Heartbeat what it should do in a failover.
<?xml version="1.0" ?> <cluster> <clustering state="on" /> <nodename value="filer01" /> <resource value="MailTo::email@example.com::ClusterFailover"/> <resource value="IPaddr::192.168.1.17/24" /> <resource value="drbddisk::"> <resource value="LVM::vg0drbd"> <resource value="Filesystem::/dev/drbd0::/cluster_metadata::ext3::defaults,noatime"> <resource value="MakeMounts"/> </cluster>
Note how the HA IP address is declared here (192.168.1.17). As mentioned before, Heartbeat controls the setup of the network interface, the mounting of the LVM volume group, and the mounting of drbd0 (/cluster_metadata).
Samba and NFS Support
Modify Samba and NFS so it's available on our /cluster_metadata drbd resource.
root@filer01 ~# mkdir /cluster_metadata/etc
Note: This moves /var/spool/samba into /cluster_metadata, which is only a 512 MB partition. So, if large print jobs are put through Samba, the free space on this volume will get eaten up pretty quickly. So, if this is the case, a separate DRBD resource should be created for the /var directory. Or, reconsider hosting print services on a different server.
root@filer02 ~# rm -rf /etc/samba/
root@filer01 ~# mv /etc/ietd.conf /cluster_metadata/etc/
root@filer02 ~# rm /etc/ietd.conf
root@filer01 ~# mv /etc/proftpd /cluster_metadata/etc/
root@filer02 ~# rm -rf /etc/proftpd
Configure Volume Group
Create a Volume group from /dev/drbd1:
root@filer1 etc# vgcreate vg0drbd /dev/drbd1
Volume group "vg0drbd" successfully created
Note: If planning on using Windows to connect to these iSCSI targets, do not use the "_" character or any other special characters when creating the volume group.
Once the Heartbeat service has been configured and started (see below), the Openfiler web administration GUI should be available on https://192.168.1.17:446. Once there, LVM volumes can be created and to exported via iSCSI etc.
Starting Heartbeat and First-Time Configuration
In order to get Openfiler to write the /etc/ha.d/haresources file based on the cluster.xml config file, restart the Openfiler service and then log onto the web interface (using the Primary node's direct IP) and click on Services and enable iSCSI.
Make sure to do this on the Primary node (filer01).
root@filer01 ~# rm /opt/openfiler/etc/httpd/modules
Note: If you use a 32-bit system, just take out the “64”.
root@filer01 ~# service openfiler restart
With any luck, Openfiler has written this file out to /etc/ha.d/haresources. If haresources was created, copy it over to filer02.
Note: Before starting Heartbeat, a volume must be created:
root@filer01 ~# lvcreate -L 400M -n filer vg0drbd
It appears if you log onto the web interface and activate a service such as NFS or iSCSI. this will force Openfiler to rewrite the /etc/ha.d/haresources file. Copy (via scp) this file over to the second node as follows:
root@filer01 ~# scp /etc/ha.d/haresources root@filer02:/etc/ha.d/haresources
Since heartbeat was added to the start up scripts earlier, reboot filer01, then reboot filer02.
If all goes well, access the primary node via a web browser on the High Available ip address: https://192.168.1.17:446.
If the web server is not accessible, a good place to look for errors is in /var/log/ha-log or /var/log/ha-debug files.
Note: The rsync configuration is meant to synchronize changes between the two nodes, but this will not happen unless using the most recent build. Therefore, see the fix at the following page:
Once Openfiler is up and running, delete the the filer volume created earlier and then create new volumes (be sure to create the new volumes before stopping the Heartbeat service, or it will not start).