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[[Category: Empty articles]]
== Checkpoint ==
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 ==
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[''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 ==
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: External]]