Community Gluster Image on Docker
Gluster
2014-06-19
If you would like to try out gluster, a new CentOS based docker container is available on the docker hub at .
For correctness and performance reasons, we recommend running Gluster on an host-mounted XFS volume that resides on a separate device from the root filesystem. For this proof of concept, we use only a single node gluster daemon.
This community image was originally created by Frederick F. Kautz IV and Harshavardhana.
Usage
Prepare an XFS mount
The preferred method to use gluster is to mount an XFS partition. If you do not have an XFS partition on your system, you can create and mount one using the following commands:
dd if=/dev/zero of=/data/gluster.xfs bs=1M count=2048 mkfs.xfs -isize=512 /data/gluster.xfs mkdir /mnt/gluster mount -oloop,inode64,noatime /data/gluster.xfs /mnt/gluster
Run docker with the XFS mount
host # docker run --privileged -i -t -h gluster -v /mnt/gluster:/mnt/vault \ gluster/gluster:latest container # df -h /mnt/vault Filesystem Size Used Avail Use% Mounted on /dev/loop4 2014M 45M 1969M 4% /mnt/vault
Access your new gluster volume from the host
Grab the ip address for the container
GLUSTER_CONTAINER_ID=$(docker ps | grep -i gluster | awk {'print $1'}
GLUSTER_IPADDR=$(docker inspect $GLUSTER_CONTAINER_ID | grep -i ipaddr | \
sed -e 's/\"//g' -e 's/\,//g' | awk {'print $2'})
Mount a container using the ip address provided in the above section.
mount -t glusterfs ${GLUSTER_IPADDR}:$VOLUME_NAME /mnt/gfs
Accessing your new gluster volume from a contaner
First, mount the volume to the host as shown in the previous section.
Second, mount the volume on container run
docker run -i -t -h gluster-client -v /mnt/gfs:/mnt/${VOLUME_NAME} gluster/gluster:latest
Note:
Shutting down and restarting gluster
Gluster stores metadata about the volume in /var/lib/glusterd and logs in /var/log/glusterfs. In order to preserve state, use docker commit before shutting down the cluster.
docker commit $GLUSTER_CONTAINER_ID mygluster:latest docker kill $GLUSTER_CONTAINER_ID
To restart gluster, simply run your tagged gluster image.
docker run --privileged -i -t -h gluster -v /mnt/gluster:/mnt/vault mygluster:latest