Setting “always restart” shouldn’t cause the container to be removed, but rather restart automatically upon failure. As long as the container is not removed, your data will still be within that container. When you launch a container, an isolated filesystem is created (based on the image) and changes made live only within the container. Docker images are stored in the Docker registry and images are exported to glance from Docker registry which Nova uses to create Containers.Sorry to hear this… There are a few fundamentals to understand when working with Docker.Nova Docker Virt driver talks to Docker agent using http api calls.To spawn containers Nova compute driver is pointed to Docker driver.Following is the architecture diagram mentioned in the Nova Docker wiki. In this approach, Nova driver is extended to spawn Docker Containers. There are lot of resources for learning Openstack and Docker available in the web, my blogs related to these topics can be found here and here. For this blog, I am assuming users are already familiar with Openstack and Docker. Openstack is opensource cloud orchestration software and Docker is opensource container management software. Magnum is pretty new and is under development. The 3 predominant approaches are using Nova Docker driver, Heat Docker plugin and Magnum. In this blog, I will cover the different ways in which Openstack can create and manage Docker Containers. The Heat approach allows us to specify environment variables, link containers, specify volumes as well as orchestrate the host on which the Docker runs.Ĭontinue reading Openstack and Docker – Part 2 →.Glance is not involved here as the container images are stored in Docker registry.The VM can either be spawned by Nova or Heat can spawn this using Nova driver. Openstack heat uses Docker plugin to talk to Docker agent on the host. Following is the architecture diagram I found in Openstack Docker wiki for heat. Heat docker plugin solves problems 1-3 and partially solves problem 4. Orchestrating and scheduling the containers.In this blog, I will cover Openstack Docker heat plugin and Magnum.įollowing are some of the items that Nova Docker driver cannot do currently: This is a continuation of my previous blog on Openstack and Docker. Otherwise, either Stacking will fail or instance creation will fail. It is needed to setup VM with atleast 4G RAM and 8G hard disk.There are some pre-requisite software that needs to be installed before running Devstack like setting up Python environment etc.For basics of Virtualbox, please refer my earlier blog on Virtualbox.įollowing are typical issues I have seen folks facing when running Devstack: Windows 7 machine with Virtualbox 4.3.28 and Vagrant 1.7.2. For getting started on Vagrant, you can refer to my earlier blog on Vagrant. Vagrant makes it easier to create and share VMs and this makes Vagrant Devops friendly. In this blog, I will walk-thru the steps for the installation. With this, VM creation and Devstack installation can all be done with a single script. To make this simple, I created Vagrant images for different Openstack releases. I received multiple queries on installation related issues. I had written 2 earlier blogs on installing Devstack for Openstack Icehouse and Openstack Juno. Devstack provides a great way to get hands-on with Openstack. Devstack script provides a development environment for Openstack. Openstack is a Cloud Orchestration software. I uninstalled boot2docker and Docker CLI worked fine after that.Ĭontinue reading Docker Kitematic for Windows → The second issue I faced was with running Docker CLI and it complained that Docker client and agent versions did not match.This was because I had boot2docker installed previously in my Windows machine. I deleted 4 of them and tried reinstalling Kitematic and the installation went through after that. I already had 6 host-only interfaces created in my Virtualbox. 1 of the workarounds I found by googling was to delete the host-only interface that Virtualbox creates for Kitematic/boot2docker. I had faced similar issue when installing boot2docker. When I tried installing, I got this issue: In my case, I already had Virtualbox installed. If Virtualbox is not installed, Kitematic installation program also installs Virtualbox. Kitematic loads a small Linux VM in Virtualbox over which the Container runs. Kitematic uses the same Linux VM as boot2docker.Īfter registering for Alpha program, I received the download link 1 day later. Kitematic is boot2docker combined with a GUI for managing containers. I had covered boot2docker in 1 of my earlier blog. I tried this recently and I will share my experiences in this blog. Recently, Kitematic released an alpha version for Windows. Kitematic simplifies Docker installation for Mac and also provides an easy GUI interface to manage Containers.
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