6.2. Updating Red Hat Gluster Storage in the Offline Mode
- Offline updates result in server downtime, as volumes are offline during the update process.
- Complete updates to all Red Hat Gluster Storage servers before updating any clients.
Updating Red Hat Gluster Storage 3.4 in the offline mode
- Ensure that you have a working backup, as described in Section 6.1, “Before you update”.
- Stop all volumes.
for vol in `gluster volume list`; do gluster --mode=script volume stop $vol; sleep 2s; done
- Run the following commands on one server at a time.
- Stop all gluster services.On Red Hat Enterprise Linux 7:
# systemctl stop glusterd # pkill glusterfs # pkill glusterfsdOn Red Hat Enterprise Linux 6:
# service glusterd stop # pkill glusterfs # pkill glusterfsd
- If you want to migrate from Gluster NFS to NFS Ganesha as part of this update, perform the following additional steps.
- Stop and disable CTDB. This ensures that multiple versions of Samba do not run in the cluster during the update process, and avoids data corruption.
# systemctl stop ctdb # systemctl disable ctdb
- Verify that the CTDB and NFS services are stopped:
ps axf | grep -E '(ctdb|nfs)[d]'
- Delete the CTDB volume by executing the following command:
# gluster vol delete <ctdb_vol_name>
- Update the system.
# yum updateReview the packages to be updated, and enter
yto proceed with the update when prompted.Wait for the update to complete.
- If updates to the kernel package occurred, or if you are migrating from Gluster NFS to NFS Ganesha as part of this update, reboot the system.
- Start glusterd.On Red Hat Enterprise Linux 7:
# systemctl start glusterdOn Red Hat Enterprise Linux 6:
# service glusterd start
- When all servers have been updated, run the following command to update the cluster operating version. This helps to prevent any compatibility issues within the cluster.
# gluster volume set all cluster.op-version 31306
cluster.op-versionvalue for Red Hat Gluster Storage 3.4 Async Update. Refer to Section 1.5, “Supported Versions of Red Hat Gluster Storage” for the correct
cluster.op-versionvalue for other versions.
- If you want to migrate from Gluster NFS to NFS Ganesha as part of this update, install the NFS-Ganesha packages as described in Chapter 4, Deploying NFS-Ganesha on Red Hat Gluster Storage, and use the information in the NFS Ganesha section of the Red Hat Gluster Storage 3.4 Administration Guide to configure the NFS Ganesha cluster.
- Start all volumes.
for vol in `gluster volume list`; do gluster --mode=script volume start $vol; sleep 2s; done
- If you did not reboot as part of the update process, run the following command to remount the meta volume:
# mount /var/run/gluster/shared_storage/If this command does not work, review the content of
/etc/fstaband ensure that the entry for the shared storage is configured correctly and re-run the
mountcommand. The line for the meta volume in the
/etc/fstabfile should look like the following:
hostname:/gluster_shared_storage /var/run/gluster/shared_storage/ glusterfs defaults 0 0
- If you use Gluster NFS to access volumes, enable Gluster NFS using the following command:
# gluster volume set volname nfs.disable offFor example:
# gluster volume set testvol nfs.disable off volume set: success
- If you use geo-replication, restart geo-replication sessions when upgrade is complete.
# gluster volume geo-replication MASTER_VOL SLAVE_HOST::SLAVE_VOL startYou may need to append the
forceparameter to successfully restart in some circumstances. See BZ#1347625 for details.