Changes

=== Run (isolated) ===

=== Run (isolated) ===

Now, if you try to simply run and try to dump such a program, crtools will  fail. The reason is a program you launch from the shell shares some common resources with the shell, notably its session and terminal. Crtools has a built-in check that makes sure there are no such resources.

Now, if you try to simply run and try to dump such a program, criu will  fail. The reason is a program you launch from the shell shares some common resources with the shell, notably its session and terminal. Criu has a built-in check that makes sure there are no such resources.

To remove the dependency on a current terminal, let's executed our script in a new session and redirect its output to a file:

To remove the dependency on a current terminal, let's executed our script in a new session and redirect its output to a file:

Dump it:

Dump it:

  # crtools dump -t 2221 -vvv -o dump.log && echo OK

  # criu dump -t 2221 -vvv -o dump.log && echo OK

  OK

  OK

Restore the test process:

Restore the test process:

  # crtools restore -d -t 2221 -vvv -o restore.log && echo OK

  # criu restore -d -t 2221 -vvv -o restore.log && echo OK

  OK

  OK

For that we need to execute our test script or another program (e.g. "top") from a terminal without any redirection.

For that we need to execute our test script or another program (e.g. "top") from a terminal without any redirection.

Note crtools only supports [http://en.wikipedia.org/wiki/Pseudo_terminal Unix98 PTYs].

Note criu only supports [http://en.wikipedia.org/wiki/Pseudo_terminal Unix98 PTYs].

=== Run ===

=== Run ===

=== Dump ===

=== Dump ===

Currently crtools doesn't support a stopped task, so "crtools dump" must be executed from another terminal.

Currently criu doesn't support a stopped task, so "criu dump" must be executed from another terminal.

  # crtools dump -t 2621

  # criu dump -t 2621

  (00.012929) Error (tty.c:1022): tty: Found dangling tty with sid 940 pgid 2621 (pts) on peer fd 0. Consider using --shell-job option.

  (00.012929) Error (tty.c:1022): tty: Found dangling tty with sid 940 pgid 2621 (pts) on peer fd 0. Consider using --shell-job option.

  (00.013111) Error (cr-dump.c:1636): Dumping FAILED.

  (00.013111) Error (cr-dump.c:1636): Dumping FAILED.

See, crtools asks to set the <code>--shell-job</code>, because we try to dump only a part of a session and a slave end of a tty pair. It is a common rule to ask a user, if only a part of something is dumped.

See, criu asks to set the <code>--shell-job</code>, because we try to dump only a part of a session and a slave end of a tty pair. It is a common rule to ask a user, if only a part of something is dumped.

  # crtools dump -vvvv -o dump.log -t 2621 --shell-job && echo OK

  # criu dump -vvvv -o dump.log -t 2621 --shell-job && echo OK

  OK

  OK

=== Restore ===

=== Restore ===

  $ ~/crtools/crtools restore -vvvv -o restore.log -t 2621 --shell-job

  # criu restore -vvvv -o restore.log -t 2621 --shell-job

  Fri Apr 12 12:41:09 MSK 2013

  Fri Apr 12 12:41:09 MSK 2013

  Fri Apr 12 12:41:10 MSK 2013

  Fri Apr 12 12:41:10 MSK 2013

[[Category:HOWTO]]

[[Category:HOWTO]]