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README.md

1.docker_migrator

The docker_migrator tool is uesd for docker container live_migration.Docker container can move to target host from source with the help of docker_migrator,and there is no need to shutdown the container.

We introduce three important concept here to help us understand docker container's live_migration.

1.1 Live Migration

What's live migration,it's a very common kind of technique for vitual machine.In traditional Cloud_Platform enviroment,we have to schedule some virtual machine considering on load-balance,system upgrating or single-node-failure,and so on.But some special virtual machine which is running process like online-game,hpc aplication which can't undertake long-time breakdown.As a result,we should implement the technique that can migrate virtual machine with real-time status from node to node.

It's the same with docker container.With the development of docker container and more and more cloud_platform developer start to use docker container to deploy application,the technique of docker container's live_migration is especially important for container schedule.

1.2 Pre-Copy

Pre-Copy is a famous live-migration strategy ,docker_migrator adopt the pre-copy strategy to implement docker container live_migration.I'll give a brief description of live_migration(pre-copy) procedure.

  • 1 FileSystem Migration:docker_migrator support two main kind of fs driver migration:AUFS,OVERLAY。
  • 2 Memory iteration migration
  • 3 Stop-and-Copy: The iteration will stop when the memory image file is small enough to make the migration transparent to application,or the iteration times reach the max times that we set before.
  • 4 Restore: After the filesystem migration and memory iteration ,we will restore the docker container on the target.If we fail to restore the container,the container will restore on the source again.

1.3 CRIU

CRIU is a tool of process live_migration in user namespce.It can save checkpoint of process real-time status,and restore the process based on the checkpoint file.Docker_migrator is implemented with the help of criu tool.Detailed imformation: https://criu.org/Main_Page

2 How to use

We provide a detailed description of the document for you.The document tell you how to setup the experiment enviroment,and use docker_migrator to live_migrate docker container.

3 Licensing

Docker_migrator is licensed under the Apache License, Version 2.0. See LICENSE for the full license text.