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add current limitation to experimental/checkpoint-restore.md 

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
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Akihiro Suda 2016-09-13 05:14:41 +00:00 committed by Tibor Vass
parent 87c8d755bd
commit 6f3f6a78a9
1 changed files with 13 additions and 1 deletions
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experimental/checkpoint-restore.md
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@ -71,5 +71,17 @@ in between running/checkpoint/restoring you should see that the counter
increases while the process is running, stops while it's checkpointed, and
resumes from the point it left off once you restore.
Note that seccomp is only supported by CRIU in very up to date kernels.
## Current Limitation
seccomp is only supported by CRIU in very up to date kernels.
External terminal (i.e. `docker run -t ..`) is not supported at the moment.
If you try to create a checkpoint for a container with an external terminal,
it would fail:
$ docker checkpoint create cr checkpoint1
Error response from daemon: Cannot checkpoint container c1: rpc error: code = 2 desc = exit status 1: "criu failed: type NOTIFY errno 0\nlog file: /var/lib/docker/containers/eb62ebdbf237ce1a8736d2ae3c7d88601fc0a50235b0ba767b559a1f3c5a600b/checkpoints/checkpoint1/criu.work/dump.log\n"
$ cat /var/lib/docker/containers/eb62ebdbf237ce1a8736d2ae3c7d88601fc0a50235b0ba767b559a1f3c5a600b/checkpoints/checkpoint1/criu.work/dump.log
Error (mount.c:740): mnt: 126:./dev/console doesn't have a proper root mount