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Container-type virtualization is an ability to run multiple isolated sets of processes, known as containers, under a single kernel instance. Having such an isolation opens the possibility to save the complete state of (in other words, to checkpoint) a container and later to restart it. Checkpointing itself is used for live migration, in particular for implementing high-availability solutions. In this paper, the authors present the checkpointing and restart feature for containers as implemented in OpenVZ. The feature allows one to checkpoint the state of a running container and restarts it later on the same or a different host, in a way transparent for running applications and network connections.
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