SimpleHekaFS

Setting up a simple HekaFS cluster

Hypervisor/Host

8 CPU, 24GB RAM, FC HBA to back-end storage, running F15.

Brick node guests on host

• F15node01 (192.168.122.21)
• F15node02 (192.168.122.22)
• F15node03 (192.168.122.23)
• F15node04 (192.168.122.24)

Client node guest(s) on host

• F15node05 (192.168.122.25)

N.B. all guest nodes are running F15.

Back-end storage

40 5G LUNs on qlogic fibrechannel, provisioned as SCSI disks, 10 per brick. N.B. Size and number of LUNs is arbitrary.

Important Links

• cloudfs git repo is git://git.fedorahosted.org/CloudFS.git
• F16 glusterfs RPMs are https://koji.fedoraproject.org/koji/buildinfo?buildID=259916
• F16 hekafs RPM is https://koji.fedoraproject.org/koji/buildinfo?buildID=259462
• HekaFS wiki page is https://fedoraproject.org/wiki/HekaFS
• F16 HekaFS Feature wiki page is https://fedoraproject.org/wiki/Features/HekaFS

the nitty gritty

• download the glusterfs, glusterfs-server, glusterfs-fuse, and hekafs RPMs
• install the RPMs on all brick nodes and client nodes
  • If you use the hekafs RPM on RHEL, change line 23 of /etc/init.d/hekafsd from python2.7 to python2.6 after installing.
• make filesystems on the iSCSI LUNs and mount them, e.g. using ext4:
  • for lun in /dev/sd? ; do sudo mkfs.ext4 $lun; done
  • for dev in /dev/sd? ; do sudo mkdir -p /bricks/basename $dev; done
  • for dev in /dev/sd? ; do sudo mount $dev /bricks/basename $dev; done
  • optional make /etc/fstab entries for the mounts
  • Note: if you use qemu/kvm guests as bricks and use xfs on iSCSI LUNs shared from the qemu/kvm host, the guests will not always probe and initialize the iSCSI LUNs correctly (fast enough) and the guests will usually require manual intervention to boot. Unmount all bricks, run xfs_repair on each iSCSI device (e.g. /dev/sda), mount the bricks, and exit to continue to boot.
• open ports in the firewall using the firewall admin utility:
  • on all bricks, open port 8080 tcp (Other Ports)
  • on all bricks, open ports 24007-24029 tcp (Other Ports)
• set up gluster on the brick nodes
  1. enable glusterfsd, glusterd, and hekafsd on each brick:
     • chkconfig glusterfsd on
     • chkconfig glusterd on
     • chkconfig hekafsd on
  2. start glusterd and hekafsd on each brick:
     • service glusterd start
     • service hekafsd start
  3. open a browser window to principal node port 8080. we use Google Chrome, Firefox seems not to work well
  4. configure nodes in your cluster
     • select Manage Servers
     • the IP address of the first or principal node is already listed
     • enter the IP address or node name and press Add
     • click 'Back to cluster configuration'
     • repeat for each node in your cluster
     • press Done
  5. configure one or more volumes in your cluster
     • select Manage Volumes
     • As per above, each node in my cluster has ten volumes: /dev/sda ... /dev/sdj, mounted on /bricks/sda ... /bricks/sdj
     • tick the checkbox for /bricks/sda on each node
     • leave Volume Type: set to Plain
     • leave Replica or Strip count blank (unset)
     • enter testsda for Volume ID
     • press Provision
     • add_local(testsda) OK ... is displayed for each node
     • click 'Back to volume configuration'
     • testsda is now shown in the list of Existing Volumes
     • repeat as desired for additional volumes
     • use the Back button in your browser to return to the Configuration Main menu
  6. configure one or more tenants in your cluster
     • select Manage Tenants
     • enter bob as the Tenant Name
     • enter carol as the Tenant Password
     • enter 10000as the Tenant UID Range: Low
     • enter 10999 as the Tenant GID Range: High
     • enter 10000 as the Tenant GID Range: Low
     • enter 10999 as the Tenant UID Range: High
     • press Add
     • add_local(bob) OK ... is displayed for each node
     • click 'Back to tenant configuration'
     • bob is now shown in the list of Existing Tenants
     • repeat as desired for additional tenants
     • click 'volumes' in the entry for bob
     • testsda is shown in the Volume List
     • tick the Enabled checkbox for testsda
     • press Update
     • Volumes enabled for bob ... is displayed for each node
     • click 'Back to tenant configuration'
  7. start the volume(s)
     • use the Back button in your browser to return to the Configuration Main menu
     • select Manage Volumes
     • click 'start' testsda entry in the list of Existing Volumes
     • start_local(testsda) returned 0 ... is displayed for each node
• mount the volume(s) on the client(s)
  • sudo hfs_mount 192.168.122.21 testsda bob carol /mnt/testsda