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This is an enhancement proposal for the checkpoint / restore feature of
Podman that enables container migration across multiple systems with
standard image distribution infrastructure.
A new option `--create-image <image>` has been added to the
`podman container checkpoint` command. This option tells Podman to
create a container image. This is a standard image with a single layer,
tar archive, that that contains all checkpoint files. This is similar to
the current approach with checkpoint `--export`/`--import`.
This image can be pushed to a container registry and pulled on a
different system. It can also be exported locally with `podman image
save` and inspected with `podman inspect`. Inspecting the image would
display additional information about the host and the versions of
Podman, criu, crun/runc, kernel, etc.
`podman container restore` has also been extended to support image
name or ID as input.
Suggested-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Radostin Stoyanov <radostin@redhat.com>
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Command flags (OPTIONS) in man pages have to date been in
haphazard order. Sometimes that order is sensible, e.g.,
most-important options first, but more often they're
just in arbitrary places. This makes life hard for users.
Here, I update the man-page-check Makefile script so it
checks and enforces alphabetical order in OPTIONS sections.
Then -- the hard part -- update all existing man pages to
conform to this requirement.
Signed-off-by: Ed Santiago <santiago@redhat.com>
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Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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CRIU's pre-copy migration support relies on the soft dirty page tracking
in the Linux kernel:
https://www.kernel.org/doc/Documentation/vm/soft-dirty.txt
This functionality is not implemented for all architectures and it can
also be turned off in the kernel.
CRIU can check if the combination of architecture/kernel/CRIU supports
the soft dirty page tracking and exports this feature checking
functionality in go-criu.
This commit adds an early check if the user selects pre-copy
checkpointing to error out if the system does not support it.
Signed-off-by: Adrian Reber <areber@redhat.com>
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adrianreber/2021-12-20-checkpoint-restore-man-pages
[CI:DOCS] Small checkpoint/restore man page fixes
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At some places the checkpoint restore man pages were using the markdown
modifier `**` inside `*..*`. This does not seem to work as intended and
results in markdown modifiers present in the final man page. Switching
to `__` inside of `*..*` seems to fix this.
Signed-off-by: Adrian Reber <areber@redhat.com>
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Checkpoint a container using systemd as entrypoint will probably result
in an error as CRIU cannot handle all the resources latest systemd uses.
This updates the checkpoint man page with this information.
Signed-off-by: Adrian Reber <areber@redhat.com>
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CRIU supports checkpoint/restore of file locks. This feature is
required to checkpoint/restore containers running applications
such as MySQL.
Signed-off-by: Radostin Stoyanov <radostin@redhat.com>
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This commit updates the man pages for checkpoint and restore to describe
the '--print-stats' parameter.
Signed-off-by: Adrian Reber <areber@redhat.com>
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MANPAGE_SYNTAX was edited.
The following manpages have been adapted to the MANPAGE_SYNTAX:
- podman-container-prune
- podman-container-restore
The following manpages have had little changes:
- podman-attach
- podman-auto-update
- podman-commit
- podman-completion
- podman-container-checkpoint
- podman-container-cleanup
- podman-container-exists
Signed-off-by: Alexander Richter <67486332+Procyhon@users.noreply.github.com>
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The following manpages have been adapted to the MANPAGE_SYNTAX:
- podman-completion
- podman-container-checkpoint
- podman-container-cleanup
- podman-container-exists
The following manpages have had little changes:
- podman-attach
- podman-commit
- MANPAGE_SYNTAX
- Makefile
Signed-off-by: Alexander Richter <67486332+Procyhon@users.noreply.github.com>
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Signed-off-by: Adrian Reber <areber@redhat.com>
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This just reorders the options in the podman-container-checkpoint man
page alphabetically. No actual content changed.
Signed-off-by: Adrian Reber <areber@redhat.com>
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Commit 800a2e2d35 introduced a way to disable the conversion of `--`into
an en dash on docs.podman.io, so the ugly workaround of escaping the
dashes is no longer necessary.
Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
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Escape the two dashes, otherwise they are combined into one long dash.
I tested that this change is safe and still renders correctly on github
and with the man pages.
This commit also contains a small change to make it build locally.
Assuming you have the dependencies installed you can do:
```
cd docs
make html
```
Preview the html files in docs/build/html with
`python -m http.server 8000 --directory build/html`.
Fixes containers/podman.io#373
Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
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Remove --volume option from podman-remote since it is
not supported, also add information to podman-build man page
indicating options not supported over remote connections.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
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Signed-off-by: Zhuohan Chen <chen_zhuohan@163.com>
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When migrating a container with associated volumes, the content of
these volumes should be made available on the destination machine.
This patch enables container checkpoint/restore with named volumes
by including the content of volumes in checkpoint file. On restore,
volumes associated with container are created and their content is
restored.
The --ignore-volumes option is introduced to disable this feature.
Example:
# podman container checkpoint --export checkpoint.tar.gz <container>
The content of all volumes associated with the container are included
in `checkpoint.tar.gz`
# podman container checkpoint --export checkpoint.tar.gz --ignore-volumes <container>
The content of volumes is not included in `checkpoint.tar.gz`. This is
useful, for example, when the checkpoint/restore is performed on the
same machine.
# podman container restore --import checkpoint.tar.gz
The associated volumes will be created and their content will be
restored. Podman will exit with an error if volumes with the same
name already exist on the system or the content of volumes is not
included in checkpoint.tar.gz
# podman container restore --ignore-volumes --import checkpoint.tar.gz
Volumes associated with container must already exist. Podman will not
create them or restore their content.
Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>
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Change the docs markdown so that flag names will be h4 headers.
Sphinx will automatically add anchors to headers. Add css to
make sure the flag names are not to big compared to the text.
The man pages also still renders fine but it looks a bit different.
Signed-off-by: Paul Holzinger <paul.holzinger@web.de>
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I wrote a script to cross-reference podman --help against
man pages. It found a bunch of inconsistencies fix them:
* options missing from man pages
* options misspelled or misformatted in man pages (usually
misplaced asterisks or missing dashes, but see --dns-opt)
* one spurious comma in the actual source file --help
This is a fix in which I iterate over 'podman CMD --help'
and check for presence in man pages. The other way around
(look for flags in man pages, check podman CMD --help)
is probably impossible: there are too many special cases
Signed-off-by: Ed Santiago <santiago@redhat.com>
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* Refactored code and Makefile to support new docs layout
* Removed some old code packaging code
* Add Readme.md to document what we're doing
Signed-off-by: Jhon Honce <jhonce@redhat.com>
Signed-off-by: baude <bbaude@redhat.com>
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