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| We will add an additional disk to the system. This disk will be used for file storage. on the kvm host |
=== Add hardware === To keep things separated the OS will be on one disk and the glusterfs filesystem will be on another disk. We will [[Domain Editing|add a disk]] to the domain. This disk will be used for the glusterfs file storage. |
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| add a 16GiB harddisk for each of the servers {{{ lvcreate --size 16G --name kvm_gluster01_vdb vg2 lvcreate --size 16G --name kvm_gluster02_vdb vg2 lvcreate --size 16G --name kvm_gluster03_vdb vg2 lvcreate --size 16G --name kvm_gluster04_vdb vg2 }}} |
=== Configure disk === |
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| hotadd those disks {{{ virsh attach-disk gluster01 --source /dev/vg2/kvm_gluster01_vdb --target vdb virsh attach-disk gluster02 --source /dev/vg2/kvm_gluster02_vdb --target vdb virsh attach-disk gluster03 --source /dev/vg2/kvm_gluster03_vdb --target vdb virsh attach-disk gluster04 --source /dev/vg2/kvm_gluster04_vdb --target vdb }}} |
==== Partition ==== Create one large partition on `/dev/vdb` with partition type `8e Linux LVM`. |
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| in the guest create one large partition on vdb with partition type linux lvm set up a new physical volume and volume group |
==== LVM ==== Set up a new physical volume, configure a volume group and add a volume |
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| lvcreate --size 4G --name gluster_www vg2 | |
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| create the volumes | ==== Format ==== Create a filesystem on the volume. |
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| lvcreate --size 4G --name gluster_www vg2 lvcreate --size 4G --name gluster_mail vg2 |
mkfs.btrfs /dev/vg2/gluster_www |
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| create the mountpoints | ==== Mountpoint ==== Create the mountpoint. |
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| mkdir /srv/mail | |
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| format the volumes {{{ mkfs.btrfs /dev/vg2/gluster_www mkfs.btrfs /dev/vg2/gluster_mail }}} add the volumes to /etc/fstab |
==== fstab ==== Add the volume to `/etc/fstab`. |
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| /dev/vg2/gluster_mail /srv/mail btrfs defaults 0 0 | |
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| ==== Mount ==== Mount the new volume. {{{ mount /srv/www }}} If the mount command does not succeed, it it most likely because the fstab entry is incorrect. |
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| === Mount Point === Glusterfs is not happy about using a directory which is also a mountpoint. ''volume create: www: failed: The brick gluster01:/srv/www is a mount point. Please create a sub-directory under the mount point and use that as the brick directory. Or use 'force' at the end of the command if you want to override this behavior.'' If for some reason the filesystem is not mounted, then glusterfs might misunderstand the situation and tell the other servers that the directory is now empty, and all files would be deleted on all servers. To avoid this a directory is created under the mount point. {{{ mkdir /srv/www/brick }}} === Install === Install the server. |
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| from gluster01 connect with the other gluster servers |
=== Introduce Servers === The glusterfs servers need to now each other. This can be done from any one server. Here we will do it from gluster01. We need to introduce the three other servers. |
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| check server status |
=== Server Status === Now check that the servers were properly probed. |
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| create the gluster volume. the force option is needed because we are creating the volume on a mountpoint. | === Create Volume === Create the gluster volume. |
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| gluster volume create www replica 4 transport tcp gluster01:/srv/www gluster02:/srv/www gluster03:/srv/www gluster04:/srv/www force | gluster volume create www replica 4 transport tcp gluster01:/srv/www/brick gluster02:/srv/www/brick gluster03:/srv/www/brick gluster04:/srv/www/brick |
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| start the volume | |
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| === Start Volume === Finally we can start the volume. |
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GlusterFS
GlusterFS is a distributed filesystem. It has built in redundancy, so it is possible to run two servers which automatically replicate files between the servers. If one server goes down, the other just takes over. Once it comes up again, files are automatically replicated. Here we will use GlusterFS as a redundant network mounted file storage.
For the sport of it, we will configure 4 GlusterFS servers.
Network
The GlusterFS servers will have fixed IP-addresses. That is configured in the DHCP servers list of statically assigned IP-adresses by using the Domains MAC address.
- 192.168.1.40 gluster01
- 192.168.1.41 gluster02
- 192.168.1.42 gluster03
- 192.168.1.43 gluster04
Disk
Add hardware
To keep things separated the OS will be on one disk and the glusterfs filesystem will be on another disk. We will add a disk to the domain. This disk will be used for the glusterfs file storage.
Configure disk
Partition
Create one large partition on /dev/vdb with partition type 8e Linux LVM.
LVM
Set up a new physical volume, configure a volume group and add a volume
pvcreate /dev/vdb1 vgcreate vg2 /dev/vdb1 lvcreate --size 4G --name gluster_www vg2
Format
Create a filesystem on the volume.
mkfs.btrfs /dev/vg2/gluster_www
Mountpoint
Create the mountpoint.
mkdir /srv/www
fstab
Add the volume to /etc/fstab.
/dev/vg2/gluster_www /srv/www btrfs defaults 0 0
Mount
Mount the new volume.
mount /srv/www
If the mount command does not succeed, it it most likely because the fstab entry is incorrect.
Software
Mount Point
Glusterfs is not happy about using a directory which is also a mountpoint.
volume create: www: failed: The brick gluster01:/srv/www is a mount point. Please create a sub-directory under the mount point and use that as the brick directory. Or use 'force' at the end of the command if you want to override this behavior.
If for some reason the filesystem is not mounted, then glusterfs might misunderstand the situation and tell the other servers that the directory is now empty, and all files would be deleted on all servers. To avoid this a directory is created under the mount point.
mkdir /srv/www/brick
Install
Install the server.
apt-get install glusterfs-server
Introduce Servers
The glusterfs servers need to now each other. This can be done from any one server. Here we will do it from gluster01. We need to introduce the three other servers.
gluster peer probe gluster02 gluster peer probe gluster03 gluster peer probe gluster04
Server Status
Now check that the servers were properly probed.
gluster peer status Number of Peers: 3 Hostname: gluster02 Uuid: 031573c2-3b1f-4946-bd78-421563249db6 State: Peer in Cluster (Connected) Hostname: gluster03 Uuid: ff5cec1c-6d7f-4db7-8676-08deff06b4d0 State: Peer in Cluster (Connected) Hostname: gluster04 Uuid: 65fc398a-52e9-4292-9bbb-884becfbf5d6 State: Peer in Cluster (Connected)
Create Volume
Create the gluster volume.
gluster volume create www replica 4 transport tcp gluster01:/srv/www/brick gluster02:/srv/www/brick gluster03:/srv/www/brick gluster04:/srv/www/brick
Start Volume
Finally we can start the volume.
root@gluster01:/srv/www# gluster volume start www volume start: www: success root@gluster01:/srv/www# gluster volume status Status of volume: www Gluster process TCP Port RDMA Port Online Pid ------------------------------------------------------------------------------ Brick gluster01:/srv/www 49152 0 Y 826 Brick gluster02:/srv/www 49152 0 Y 1355 Brick gluster03:/srv/www 49152 0 Y 1034 Brick gluster04:/srv/www 49152 0 Y 1135 Self-heal Daemon on localhost N/A N/A Y 846 Self-heal Daemon on gluster02 N/A N/A Y 1377 Self-heal Daemon on gluster03 N/A N/A Y 1054 Self-heal Daemon on gluster04 N/A N/A Y 1155 Task Status of Volume www ------------------------------------------------------------------------------ There are no active volume tasks