GlusterFS Containers
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The document outlines a GlusterFS meetup held in June 2016 in Bangalore, India, covering topics such as GlusterFS, Docker, and the benefits of containers. Key points include an explanation of the GlusterFS distributed file system, the efficiency of Docker containers, and the steps for configuring a GlusterFS container. It also touches on networking options and persistence of configuration in containerized environments.
GlusterFS Containers
- 2. Gluster Meetup June 2016, Bangalore, India Mohamed Ashiq Liyazudeen Associate Software Engineer @redhat @ IRC:ashiq on freenode, github: github.com/MohamedAshiqrh, mailto: ashiq333@gmail.com Humble Devassy Chirammal Senior Software Engineer @redhat @ IRC : hchiramm on freenode, github : github.com/humblec, mailto : humble.devassy@gmail.com
- 3. Gluster Meetup June 2016, Bangalore, India Agenda ● GlusterFS ● Docker ● Why containers? ● GlusterFS Container ● Q&A
- 4. Gluster Meetup June 2016, Bangalore, India GlusterFS ● Open-source scale-out distributed file system. ● Aggregates various storage servers over network interconnects into one large parallel network file system. ● User space filesystem with no dedicated metadata server that helps us achieve scalability.
- 5. Gluster Meetup June 2016, Bangalore, India Docker ● Docker offers a simple way to package an application and its runtime dependencies into a single container. ● Docker Container uses shared kernel concept and are much more efficient than hypervisors in system resource terms. ● Docker is both a development tool and a runtime environment.
- 6. Gluster Meetup June 2016, Bangalore, India Container Architecture Source: Docker Inc.
- 7. Gluster Meetup June 2016, Bangalore, India Docker Concepts ● Docker Image is a static specification of what the container should be in runtime, including the application code inside the container and runtime configuration settings. They are Read-only.
- 8. Gluster Meetup June 2016, Bangalore, India Docker Concepts ● Docker container always starts with an image and is considered an instantiation of that image.
- 9. Gluster Meetup June 2016, Bangalore, India Why Container? ● Shared Kernel ● Environment Regardless ● Isolation ● Minimizes System Drift ● Shipping ● Cleaner updates and Manageable state change ● Storage Hyper-converged Environment Support
- 10. Gluster Meetup June 2016, Bangalore, India GlusterFS Container ● Systemd is used in GlusterFS container because gluster needs to run more than one process in the container. ● GlusterFS configuration is made persistent as containers writable layer is not persistent in case of re- spawn. ● Even though GlusterFS can operate on any networking model, we prefer host networking (--net=host) of Docker for better performance on storage network.
- 11. Gluster Meetup June 2016, Bangalore, India Steps Breakdown ● Pull the image ● Prepare the node for GlusterFS configuration persistence(create directories /var/lib/glusterd, /var/log/glusterfs and /etc/glusterfs). ● /var/lib/glusterd – volume management files ● /var/log/glusterfs – gluster log files ● /etc/glusterfs – glusterd management files ● GlusterFS prerequisites(like opening the required port). ● Start GlusterFS container.
- 12. Gluster Meetup June 2016, Bangalore, India GlusterFS Container ● # docker pull gluster/gluster-centos:gluster3u7_centos7 ● # mkdir -p /etc/glusterfs /var/lib/glusterd /var/log/glusterfs ● # modprobe dm_snapshot (in case of snapshot) ● # docker run --name gluster -d -v /etc/glusterfs:/etc/glusterfs:z -v /var/lib/glusterd:/var/lib/glusterd:z -v /var/log/glusterfs:/var/log/glusterfs:z -v /sys/fs/cgroup:/sys/fs/cgroup:ro --net=host --privileged=true -v /dev:/dev gluster/gluster- centos:gluster3u7_centos7
- 13. Gluster Meetup June 2016, Bangalore, India GlusterFS docker run As seen before its a long command, lets check why all the options are required. ● As Gluster needs to run more than one service in a container, It needs systemd. For systemd to run in a container “--privileged=true”. ● Host Networking (--net=host) of Docker for better performance on storage network.
- 14. Gluster Meetup June 2016, Bangalore, India Network options ● Docker Network “none”, adds a container to a container-specific network stack. ● Docker Network ”bridge”, represents the bridge network (default docker0). ● Docker Network ”host”, adds a container on the hosts network stack.
- 15. Gluster Meetup June 2016, Bangalore, India Persistence of Gluster configuration ● -v /etc/glusterfs:/etc/glusterfs:z -v /var/lib/glusterd:/var/lib/glusterd:z -v /var/log/glusterfs:/var/log/glusterfs:z ● The above ensures that the gluster configuration are persistent, In the command. ● As we mention “:z” - SELinux labels are automatically reset to svirt_sandbox_file_t so that the container can interact with the Host directory.
- 16. Gluster Meetup June 2016, Bangalore, India Gluster Peer Probe
- 17. Gluster Meetup June 2016, Bangalore, India Trusted Storage Pool
- 18. Gluster Meetup June 2016, Bangalore, India References ● http://humblec.com/building-glusterfs-in-a-docker-container/ ● http://humblec.com/gluster_containers_in_kubernetes_clust ● http://humblec.com/glusterfs-containers-docker-kubernetes- ● https://hub.docker.com/r/gluster/ ● https://github.com/gluster/docker ● https://github.com/gluster/glusterfs-kubernetes-openshift
- 19. Gluster Meetup June 2016, Bangalore, India Q & A