Docker in OpenStack
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Docker allows developers and sysadmins to build, ship, and run distributed applications. OpenStack supports Docker through the nova Docker driver and Heat Docker plugin. The nova driver implements the OpenStack API to launch and manage Docker containers, while the Heat plugin allows defining Docker containers in orchestration templates. Considerations for Docker in OpenStack include containers being better suited for some use cases than VMs, and lack of full integration between Docker and some OpenStack services like Cinder and Neutron.
![Case 2: Enabling Docker
1. Configure nova
[DEFAULT]
compute_driver =
novadocker.virt.docker.DockerDriver
2. Create file /etc/nova/rootwrap.d/docker.filters
# nova-rootwrap command filters for setting up
network in the docker driver
# This file should be owned by (and only-writeable
by) the root user
[Filters]
# nova/virt/docker/driver.py: 'ln', '-sf',
'/var/run/netns/.*'
ln: CommandFilter, /bin/ln, root](https://image.slidesharecdn.com/dockerinopenstack-140925080529-phpapp02/85/Docker-in-OpenStack-10-320.jpg)
![Case 2: Using Docker
• Configure glance
[DEFAULT]
container_formats = ami,ari,aki,bare,ovf,docker
Follow the same workflow as other virt drivers:
• Create/Add/Use Docker images with Glance
• Create/Manage instances with Nova](https://image.slidesharecdn.com/dockerinopenstack-140925080529-phpapp02/85/Docker-in-OpenStack-11-320.jpg)
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![[Open stack] heat + docker](https://cdn.slidesharecdn.com/ss_thumbnails/openstackheatdocker-131022214649-phpapp02-thumbnail.jpg?width=560&fit=bounds)
Docker in OpenStack
- 1. Docker in OpenStack Joint Athens OpenStack User Group and Docker Athens Meetup, 24th September 2014 Thanassis Parathyras [email protected], @parathyras
- 2. Announcements [email protected] • Join at http://lists.openstack.org OpenStack Summit (http://openstackceeday.com) • 3-7 November, Paris • Contact me for a discount code
- 3. OpenStack’s mission “to produce the ubiquitous Open Source Cloud Computing platform that will meet the needs of public and private clouds regardless of size, by being simple to implement and massively scalable”
- 4. Docker, what is it? “an open platform for developers and sysadmins to build, ship, and run distributed applications”
- 5. VMs and Containers Smaller resource footprint, same level isolation
- 6. Docker support in OpenStack OpenStack Compute (nova) • Docker driver (since Havana) • Driver not in main source code tree – Faster dev cycles, future plan for merging • Implements OpenStack API OpenStack Orchestration (heat) • Docker plugin • Deploy and manage containers • Native Docker API
- 8. Case 1: Docker with Heat Assume an OpenStack with Heat operational environment 1. Install the Docker plugin in Heat cd contrib/heat-docker sudo python ./setup.py install Check Heat property plugin_dirs includes /usr/lib/heat 2. Restart Heat Only the process "heat-engine" needs to be restarted to load the new installed plugin Use this plugin enable Docker containers as resources in Heat templates
- 9. Case 2: Docker with Nova Assume an OpenStack operational environment 1. Install Docker on your compute hosts 2. Fix permissions usermod -G docker nova service openstack-nova-compute restart 3. Install driver pip install -e git+https://github.com/stackforge/nova-docker# egg=novadocker
- 10. Case 2: Enabling Docker 1. Configure nova [DEFAULT] compute_driver = novadocker.virt.docker.DockerDriver 2. Create file /etc/nova/rootwrap.d/docker.filters # nova-rootwrap command filters for setting up network in the docker driver # This file should be owned by (and only-writeable by) the root user [Filters] # nova/virt/docker/driver.py: 'ln', '-sf', '/var/run/netns/.*' ln: CommandFilter, /bin/ln, root
- 11. Case 2: Using Docker • Configure glance [DEFAULT] container_formats = ami,ari,aki,bare,ovf,docker Follow the same workflow as other virt drivers: • Create/Add/Use Docker images with Glance • Create/Manage instances with Nova
- 12. Considerations and open issues • Containers don't aim to be a replacement for VMs – they are better for specific use cases – VMs and containers may co-exist in a cloud environment • Docker driver for nova – Lack of integration with Cinder and Neutron – Imports constraints with OpenStack API • Orchestrating containers – A different approach than treating them as another hypervisor type – Better fitted to Docker workflow • Further integration – Docker authentication through OpenStack Identity (keystone)
- 13. OpenStack is YOU • Documentation – http://docs.openstack.org Cloud Administrator Guide • Questions – http://ask.openstack.org • Participate – http://www.openstack.org/join/register – http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack – http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-el – #OSATH, http://www.meetup.com/Athens-OpenStack-User-Group • Contribute – code (develop, review), docs, translations, bug reports – Review system Gerrit, https://wiki.openstack.org/wiki/GerritWorkflow • Follow – @openstack
- 14. Thank you for being patient! Athens OpenStack User Group #OSATH http://www.meetup.com/Athens-OpenStack-User-Group Thanassis Parathyras [email protected], @parathyras