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add current limitation to experimental/checkpoint-restore.md

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Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
Upstream-commit: d1c910af383fcce51e57c23b0c848c1f3c3baa8f
Component: engine
This commit is contained in:
Akihiro Suda
2016-09-13 05:14:41 +00:00
parent 3fe1e84cec
commit 0ac3b2e9e4
1 changed files with 13 additions and 1 deletions
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14
components/engine/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