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Migration via unix sockets.

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Implement migration via unix sockets.  While you can fake this using
exec and netcat, this involves forking another process and is
generally not very nice.  By doing this directly in qemu, we can avoid
the copy through the external nc command.  This is useful for
implementations (such as libvirt) that want to do "secure" migration;
we pipe the data on the sending side into the unix socket, libvirt
picks it up, encrypts it, and transports it, and then on the remote
side libvirt decrypts it, dumps it to another unix socket, and
feeds it into qemu.

The implementation is straightforward and looks very similar to
migration-exec.c and migration-tcp.c

Signed-off-by: Chris Lalancette <clalance@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Chris Lalancette 2009-08-05 17:24:29 +02:00 • committed by Anthony Liguori
parent 1632dc6a8f
commit 4951f65bd3
4 changed files with 227 additions and 1 deletions
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4
migration.c
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@ -43,6 +43,8 @@ void qemu_start_incoming_migration(const char *uri)
#if !defined(WIN32)
else if (strstart(uri, "exec:", &p))
exec_start_incoming_migration(p);
else if (strstart(uri, "unix:", &p))
unix_start_incoming_migration(p);
#endif
else
fprintf(stderr, "unknown migration protocol: %s\n", uri);
@ -58,6 +60,8 @@ void do_migrate(Monitor *mon, int detach, const char *uri)
#if !defined(WIN32)
else if (strstart(uri, "exec:", &p))
s = exec_start_outgoing_migration(p, max_throttle, detach);
else if (strstart(uri, "unix:", &p))
s = unix_start_outgoing_migration(p, max_throttle, detach);
#endif
else
monitor_printf(mon, "unknown migration protocol: %s\n", uri);