From b0572d622974837c2221ed1f01a2ab982f078370 Mon Sep 17 00:00:00 2001
From: Adrian Reber <areber@redhat.com>
Date: Tue, 20 Nov 2018 15:34:15 +0000
Subject: Added option to keep containers running after checkpointing
CRIU supports to leave processes running after checkpointing:
-R|--leave-running leave tasks in running state after checkpoint
runc also support to leave containers running after checkpointing:
--leave-running leave the process running after checkpointing
With this commit the support to leave a container running after
checkpointing is brought to Podman:
--leave-running, -R leave the container running after writing checkpoint to disk
Now it is possible to checkpoint a container at some point in time
without stopping the container. This can be used to rollback the
container to an early state:
$ podman run --tmpfs /tmp --name podman-criu-test -d docker://docker.io/yovfiatbeb/podman-criu-test
$ curl 10.88.64.253:8080/examples/servlets/servlet/HelloWorldExample
3
$ podman container checkpoint -R -l
$ curl 10.88.64.253:8080/examples/servlets/servlet/HelloWorldExample
4
$ curl 10.88.64.253:8080/examples/servlets/servlet/HelloWorldExample
5
$ podman stop -l
$ podman container restore -l
$ curl 10.88.64.253:8080/examples/servlets/servlet/HelloWorldExample
4
So after checkpointing the container kept running and was stopped after
some time. Restoring this container will restore the state right at the
checkpoint.
Signed-off-by: Adrian Reber <areber@redhat.com>
---
cmd/podman/checkpoint.go | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
(limited to 'cmd')
diff --git a/cmd/podman/checkpoint.go b/cmd/podman/checkpoint.go
index 49e2aec63..ddfd12bc3 100644
--- a/cmd/podman/checkpoint.go
+++ b/cmd/podman/checkpoint.go
@@ -23,6 +23,10 @@ var (
Name: "keep, k",
Usage: "keep all temporary checkpoint files",
},
+ cli.BoolFlag{
+ Name: "leave-running, R",
+ Usage: "leave the container running after writing checkpoint to disk",
+ },
cli.BoolFlag{
Name: "all, a",
Usage: "checkpoint all running containers",
@@ -51,7 +55,8 @@ func checkpointCmd(c *cli.Context) error {
defer runtime.Shutdown(false)
options := libpod.ContainerCheckpointOptions{
- Keep: c.Bool("keep"),
+ Keep: c.Bool("keep"),
+ KeepRunning: c.Bool("leave-running"),
}
if err := checkAllAndLatest(c); err != nil {
--
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