Docker volume-isolator-in-mesos
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1) The Docker Volume Isolator in Mesos allows containers to use external distributed storage volumes for persistent data, providing availability and scale beyond a single host. 2) It uses a driver-based model where volume drivers like Convoy and Rex-ray manage the external storage, and the isolator handles mounting volumes into containers. 3) The isolator mounts and unmounts volumes using the driver name and volume name, providing operators flexibility in their choice of storage platforms like IBM Spectrum Scale, AWS EBS, or GCE.
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The Paris OpenStack Summit had over 5000 attendees from 876 companies representing 62 countries. Major themes included the growing community with new platinum members like Intel and SAP, increased interest in Docker and NFV, and Ceph emerging as a unified storage solution. Projects are focusing on usability, debugability, and scalability through efforts like refactoring Nova scheduler and Horizon, and enhancing HEAT.
OpenStack Resource Scheduling
OpenStack中的资源调度
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Docker volume-isolator-in-mesos
- 1. 1 Docker Volume Isolator In Mesos Jie Yu, Gilbert Song, Guangya Liu
- 2. 2 Gilbert Song Distributed Systems Engineer Mesosphere Guangya LiuJie Yu Distributed Systems Engineer Apache Mesos PMC & Committer Mesosphere Senior Software Engineer IBM
- 3. 3 If your containers are “cattle”, you have nothing to lose... The test: I don’t need persistence beyond the life of the container instance or host. But what to do if your containers are pet, if you containers need to persist data? Motivation
- 4. 4 Stateful Service: A service that needs to persist data/state A typical stateful service ● Use external volume services ● Stateless to Mesos Stateful services (like databases) need durable and scalable state Motivation
- 5. 5 There are many docker images on DockerHub are databases... Motivation
- 6. 6 Current state of storage solution in `MesosContainerizer` Local ● Persistent Volume Master Mesos Agent Aurora Executor Tasks mysqld datanode Hadoop Executor Tasks Operating System
- 7. 7 But local is not enough!! Local ● Availability Risk ○ Migrate container to another host – your storage is gone ○ Host goes down – your service goes down ● Scale Limitation ○ Need more storage than the host has? Sorry…
- 8. 8 What we would like? External Distributed Volume for stateful service Master Mesos Agent Aurora Executor Tasks mysqld datanode Hadoop Executor Tasks Operating System
- 9. 9 The challenges + others Give operator the freedom to choose different external storage platforms.
- 10. 10 Docker with External Volume IBM Spectrum Scale AWS GCE OpenStack Docker Volume Driver
- 11. 11 Mesos with External Volume IBM Spectrum Scale AWS GCE OpenStack Docker Volume Driver
- 12. Docker Volume Isolator Docker Volume Isolator IBM Spectrum Scale AWS GCE OpenStack Docker Volume Driver ● A driver based model ● Docker Volume Isolator takes care of business intelligence: ○ Mount with driver name, volume name and some options. ○ Unmount with driver name and volume name. 12
- 13. 13 Docker Volume Isolator Architecture HTTP/JSON UNIX/TCP SOCKETS for Docker Volume API Docker Volume Driver Plugin (Convoy, Rex-ray, Flocker) Docker Volume Driver Client Docker Volume Isolator dvdcli Docker Daemon (Optional) Docker Volumes Mount: dvdcli mount –volumedriver=convoy –volumename=vol1 --volumeopts=size=5 --volumeopts=iops=150 Unmount: dvdcli unmount --volumedriver=convoy --volumename=vol1 DeviceMapper NFS Amazon EBS GlusterFS Ceph
- 15. How does it works (with Rex-ray)? Mesos Agent docker/volume dvdcli Rex-ray Container 1) Framework launch a task 2) Provision the container 3) Get the mount point from dvdcli 4) Mount the external volume to mesos container EBS
- 16. 16 ● Have `dvdcli` installed on each agent ● Volume Lifecycle management (create, delete) ● Use the same Docker volume in both the DockerContainerizer and the MesosContainerizer simultaneously is strongly discouraged ○ MesosContainerizer has its own reference counting to decide when to unmount a Docker volume. ○ It would be problematic if a Docker volume is unmounted by MesosContainerizer but the DockerContainerizer is still using it. Limitations
- 17. 17 ● Get rid of `dvdcli` Future Work
- 18. 18 ● Part of DC/OS ● Create Volumes with your normal Marathon App Definition ● Track via Marathon UI ● Reuse the same volume after app restart External Volumes in Marathon and DC/OS