Lightning Talk: Running MongoDB on Docker for High Performance Deployments

Editor's Notes

• #9: Amazon Web Services In Docker verpackte Applikationen lassen sich z.B. über Amazon Elastic Beanstalk bereitstellen. Google Anhand von Google Kubernetes lassen sich eine Vielzahl von Docker Containern auf der Google Compute Engine bereitstellen. Red Hat Mit dem Project Atomic hat Red Hat ein Betriebssystem entwickelt, das als Basis für ein Host-System dienen soll, um Docker Container bereitzustellen. Microsoft Microsoft hat Docker in seine Azure Plattform integriert, um Docker Container via virtuellen Linux Maschinen auf Azure bereitzustellen. IBM IBM hat gleich mehrere Projekte gestartet, um den Docker-Einsatz im Unternehmensumfeld voranzutreiben. Hierzu wird ein DockerHub auf Softlayer zur Verfügung gestellt, um den Kunden den Zugriff auf das Docker Repository inklusive aller 14.000 Docker-Applikationen zu ermöglichen. Weiterhin wird in Zukunft ein von IBM zertifiziertes Docker-Image des WebSphere Liberty Profile Application Server angeboten. Die Unterstützung und Adaption großer IT-Unternehmen, allen voran Microsoft, Google und IBM zeigt die große Bedeutung der Docker-Technologie für deren Zielgruppen und den Entwicklermarkt im Allgemeinen. IBM aber auch Microsoft können Docker dabei helfen, mittelfristig ebenfalls im Unternehmensumfeld Fuß zu fassen, um Portabilität von Cloud-Anwendungen zu optimieren.
• #13: Baseimage-docker is a special Docker image that is configured for correct use within Docker containers. It is Ubuntu, plus: Modifications for Docker-friendliness. Workarounds for some Docker bugs. Useful administration tools. You can use it as a base for your own Docker images. What are the problems with the stock Ubuntu base image? Ubuntu is not designed to be run inside Docker. Its init system, Upstart, assumes that it's running on either real hardware or virtualized hardware, but not inside a Docker container. But inside a container you don't want a full system anyway, you want a minimal system. But configuring that minimal system for use within a container has many strange corner cases that are hard to get right if you are not intimately familiar with the Unix system model. This can cause a lot of strange problems. Baseimage-docker gets everything right. The "Contents" section describes all the things that it modifies.
• #14: Pros Does not require a tool like nsenter to be available on the Docker host. Virtually everybody already has an SSH client installed. There no surprises with processes behaving slightly differently than normal, as is the case when using nsenter. Does not require root privileges on the Docker host. Allows you to let users login to the container, without letting them login to the Docker host. However, this is not enabled by default because baseimage-docker does not expose the SSH server to the public Internet by default. Cons Requires setting up SSH keys. However, baseimage-docker makes this easy for many cases through a pregenerated, insecure key. Read on to learn more.
• #15: Use a data only container that only exposes a volume Volume can be mounted by other containers Can use smallest image possible (busybox) Data container will survive until last container that has a mount is removed Data is available in docker directory structure Can upgrade docker image for eg. Updating mongodb Warning: don‘t mount on two mongodb containers at the same time
• #16: Basically a git repositroy for docker images Ensures consistency of images across hosts through versioning Can store data in many forms: s3 locally ceph azure gcs openstack swift Speeds up distribution of images
• #17: Skydock /skydns Custom scripts on aws No good solution for networking across hosts