Hello all fellow GlusterFriends, I would like you to comment / correct my upgrade procedure steps on replica 2 volume of 3.7.x gluster. Than I would like to change replica 2 to replica 3 in order to correct quorum issue that Infrastructure currently has. Infrastructure setup: - all clients running on same nodes as servers (FUSE mounts) - under gluster there is ZFS pool running as raidz2 with SSD ZLOG/ZIL cache - all two hypervisor running as GlusterFS nodes and also Qemu compute nodes (Ubuntu 16.04 LTS) - we are running Qemu VMs that accesses VMs disks via gfapi (Opennebula) - we currently run : 1x2 , Type: Replicate volume Current Versions : glusterfs-* [package] 3.7.6-1ubuntu1 qemu-* [package] 2.5+dfsg-5ubuntu10.2glusterfs3.7.14xenial1 What we need : (New versions) - upgrade GlusterFS to 3.12 LTM version (Ubuntu 16.06 LTS packages are EOL - see https://www.gluster.org/community/release-schedule/) - I want to use https://launchpad.net/~gluster/+archive/ubuntu/glusterfs-3.12 as package repository for 3.12 - upgrade Qemu (with build-in support for libgfapi) - https://launchpad.net/~monotek/+archive/ubuntu/qemu-glusterfs-3.12 - (sadly Ubuntu has packages build without libgfapi support) - add third node to replica setup of volume (this is probably most dangerous operation) Backup Phase - backup "NFS storage” - raw DATA that runs on VMs - stop all running VMs - backup all running VMs (Qcow2 images) outside of gluster Upgrading Gluster Phase - killall glusterfs glusterfsd glusterd (on every server) (this should stop all gluster services - server and client as it runs on same nodes) - install new Gluster Server and Client packages from repository mentioned upper (on every server) - install new Monotek's qemu glusterfs package with gfapi enabled support (on every server) - /etc/init.d/glusterfs-server start (on every server) - /etc/init.d/glusterfs-server status - verify that all runs ok (on every server) - check : - gluster volume info - gluster volume status - check gluster FUSE clients, if mounts working as expected - test if various VMs are able tu boot and run as expected (if libgfapi works in Qemu) - reboot all nodes - do system upgrade of packages - test and check again Adding third node to replica 2 setup (replica 2 => replica 3) (volumes will be mounted and up after upgrade and we tested VMs are able to be served with libgfapi = upgrade of gluster sucessfuly completed) (next we extend replica 2 to replica 3 while volumes are mounted but no data is touched = no running VMs, only glusterfs servers and clients on nodes) - issue command : gluster volume add-brick volume replica 3 node3.san:/tank/gluster/brick1 (on new single node - node3) so we change : Bricks: Brick1: node1.san:/tank/gluster/brick1 Brick2: node2.san:/tank/gluster/brick1 to : Bricks: Brick1: node1.san:/tank/gluster/brick1 Brick2: node2.san:/tank/gluster/brick1 Brick3: node3.san:/tank/gluster/brick1 - check gluster status - (is rebalance / heal required here ?) - start all VMs and start celebration :) My Questions - is heal and rebalance necessary in order to upgrade replica 2 to replica 3 ? - is this upgrade procedure OK ? What more/else should I do in order to do this upgrade correctly ? Many thanks to all for support. Hope my little preparation howto will help others to solve same situation. Best Regards, Martin |
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