External resources

A resource is called "external", if it can't be dumped and restored without some help from the caller. Usually this means that a part of its state is out of a dumped container.

Dump

Typically external resources are just told to be such on dump. The respective option looks like --external TYPE[ID]:VAL option, where TYPE is resource type, ID is resource ID and VAL is optional argument.

Restore

Restoring external resources heavily depends on its type. Some resources can be restored by CRIU itself with the help of --external option, some cannot. See below for further details.

Resource types

The following external resources can be checkpointed and restored:

• External bind mounts
• External mount devices
• External files
• External UNIX socket
• VETH device
• Mac-Vlan
• External net namespaces

See also

• Shell jobs