Changes

== Checkpoint ==

== Checkpoint ==

VETH is an interconnected pair of devices in two different network namespace. Checkpointing a network namespace with an VETH device in it doesn't require any special options for CRIU. Upon checkpoint, information about one end of VETH pair is saved to [[images]], when this device dies (together with the containing namespace), and the other end dies instantly, too, as it has no peer.

VETH is an interconnected pair of devices in two different network namespace. With CRIU, you can checkpoint a network namespace with an VETH device in it (called "inner" device) doesn't require any special options for CRIU. Upon checkpoint, information about the inner VETH device is saved to [[images]], when this device dies (together with the containing namespace), and the other end (called "outer" device) dies instantly, too, for the lack of peer.

== Restore ==

== Restore ==

When you restore a net namespace with a VETH device end in it, CRIU creates a VETH pair automatically. By default, the "outer" device name is autogenerated by the kernel, which is not convenient. Option <code>--external</code> ([[RPC]] equivalent is <code>opts.external</code> field) can be used to set that name explicitly.

When you restore a net namespace with a VETH device end in it, CRIU creates a VETH pair automatically. By default, the outer device name is autogenerated by the kernel, which is not convenient. Option <code>--external</code> (or [[RPC]] equivalent field <code>opts.external</code>) can be used to set that name explicitly.

The syntax is <code>--external veth[''NAME'']:''HOSTNAME''@''BRIDGE''</code>, with the <code>@''BRIDGE''</code> part being optional. Here ''NAME'' is an "inner" VETH device name, and ''HOSTNAME'' is the "outer" VETH device name. If <code>@''BRIDGE''</code> is specified, the ''HOSTNAME'' device is added to the appropriate bridge device.

The syntax is <code>--external veth[''inner_dev'']:''outer_dev''@''bridge''</code>, with the <code>@''bridge''</code> part being optional. Here ''inner_dev'' is an "inner" VETH device name, and ''outer_dev'' is the "outer" VETH device name. If <code>@''bridge''</code> is specified, the ''outer_dev'' device is added to that bridge.

== Obsoleted option ==

== Obsoleted option ==

Option <code>--veth-pair NAME=HOSTNAME[@BRIDGE]</code> (or corresponding [[RPC]] field <code>opts.veths</code>) was used in old versions of CRIU for the same effect as <code>--external veth</code>. This option is now obsolete and will be [[deprecation|deprecated]] soon.

Option <code>--veth-pair ''inner_dev''=''outer_dev''[@''bridge'']</code> (or corresponding [[RPC]] field <code>opts.veths</code>) was used in old versions of CRIU for the same effect as <code>--external veth</code>. This option is now obsolete and will be [[deprecation|deprecated]] soon.

[[Category: HOWTO]]

[[Category: HOWTO]]

[[Category: API]]

[[Category: API]]

[[Category: Network]]

[[Category: Network]]