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migration: add possibility to restore a container with a new name

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The option to restore a container from an external checkpoint archive
(podman container restore -i /tmp/checkpoint.tar.gz) restores a
container with the same name and same ID as id had before checkpointing.

This commit adds the option '--name,-n' to 'podman container restore'.
With this option the restored container gets the name specified after
'--name,-n' and a new ID. This way it is possible to restore one
container multiple times.

If a container is restored with a new name Podman will not try to
request the same IP address for the container as it had during
checkpointing. This implicitly assumes that if a container is restored
from a checkpoint archive with a different name, that it will be
restored multiple times and restoring a container multiple times with
the same IP address will fail as each IP address can only be used once.

Signed-off-by: Adrian Reber <areber@redhat.com>
This commit is contained in:
Adrian Reber
2019-03-14 07:57:16 +00:00
parent 0e072f9a97
commit bef83c42ea
10 changed files with 93 additions and 4 deletions
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12
docs/podman-container-restore.1.md
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@ -48,6 +48,18 @@ Import a checkpoint tar.gz file, which was exported by Podman. This can be used
to import a checkpointed container from another host. It is not necessary to specify
a container when restoring from an exported checkpoint.
**--name, -n**
This is only available in combination with **--import, -i**. If a container is restored
from a checkpoint tar.gz file it is possible to rename it with **--name, -n**. This
way it is possible to restore a container from a checkpoint multiple times with different
names.
If the **--name, -n** option is used, Podman will not attempt to assign the same IP
address to the container it was using before checkpointing as each IP address can only
be used once and the restored container will have another IP address. This also means
that **--name, -n** cannot be used in combination with **--tcp-established**.
## EXAMPLE
podman container restore mywebserver