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@@ -71,5 +71,17 @@ in between running/checkpoint/restoring you should see that the counter
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increases while the process is running, stops while it's checkpointed, and
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resumes from the point it left off once you restore.
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-Note that seccomp is only supported by CRIU in very up to date kernels.
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+## Current Limitation
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+
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+seccomp is only supported by CRIU in very up to date kernels.
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+
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+External terminal (i.e. `docker run -t ..`) is not supported at the moment.
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+If you try to create a checkpoint for a container with an external terminal,
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+it would fail:
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+
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+ $ docker checkpoint create cr checkpoint1
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+ 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"
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+
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+ $ cat /var/lib/docker/containers/eb62ebdbf237ce1a8736d2ae3c7d88601fc0a50235b0ba767b559a1f3c5a600b/checkpoints/checkpoint1/criu.work/dump.log
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+ Error (mount.c:740): mnt: 126:./dev/console doesn't have a proper root mount
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Akihiro Suda