Checkpoint/restore of containers with CRIU
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This document summarizes the current status and plans for checkpoint-restore of containers using CRIU (Checkpoint-Restore In Userspace). CRIU allows live migration of containers by taking incremental checkpoints of a container's memory and filesystem and restoring it on another host with minimal downtime. The latest CRIU release supports checkpointing and restoring most typical application needs and is being integrated with container tools like OpenVZ, LXC, and Docker to enable live migration capabilities. The document outlines usage scenarios for CRIU and provides demos of how it works with OpenVZ and for live migration using the P.Haul project, which bundles CRIU functionality for live migration of containers between hosts.
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Checkpoint/restore of containers with CRIU
- 1. Checkpoint-restore of containers with CRIU. Current status and plans. Pavel Emelyanov, Saied Kazemi, Tycho Andersen, Serge Hallyn Linux Plumbers, Düsseldorf, Germany, 2014
- 2. 2 Agenda What is CRIU? Briefly What's the latest release look like Where we are now and where we go next CRIU and OpenVZ CRIU and Docker CRIU and LXC Live migration with CRIU a.k.a. P.Haul
- 3. 3 What is CRIU? Checkpoint-Restore In Userspace Processes Checkpoint or Dump Restore or Restart Image files with state
- 4. 4 What is CRIU? (cont.) Project started ~3 years ago – Kernel community refused to have all-in-kernel C/R functionality – Tried to go from user-space with required extentions of the kernel API
- 5. 5 Usage scenarios Live migration Kernel upgrade w/o reboot Slow services startup Periodic snapshots (HPC) Advanced debugging and testing Moving app to screen Save button for games :)
- 6. 6 Current project state 1.3 released September 1st – 1.3.1 released September 12 th Can C/R almost all that typicall apps need environment (namespaces, cgroups, mountpoints) configured by OpenVZ, LXC and Docker Has CLI and RPC APIs (and a C library for the latter) Features for live migration incremental dumps C/R one end of established TCP connection Gets integrated with OpenVZ, LXC and Docker tools!
- 7. 7 CRIU and OpenVZ OpenVZ.next is RHEL7 (3.10++) based Vzctl 4.7.3 is very likely to use CRIU Vzmigrate is likely to use P.Haul
- 10. 10 Live migration Live migration ≠ Dump + Copy images + Restore Start Pre copy applications memory Pre copy filesystem Enough? Find out what has changed No Dump the rest Copy images Restore Finish Frozen (Downtime)
- 11. 11 P.Haul project Collects all CRIU bits and pieces together Does a set of incremental dumps Checks the progress Does final dump-copy-restore step Uses plugins for container-specific things Understands container ID Copies filesystem if required Migrates configs Helps with network connections locking Etc.
- 12. 12 P.Haul demo
- 13. 13 CRIU project resources http://criu.org – project news and documentation http://git.criu.org – git repo with tool sources +CRIU page criu@openvz.org mailing list Thank you!