Changes

The <code>crtools</code> utility can be used to perform live migration of apps or containers. This page is a sort of HOWTO describing this.

The <code>criu</code> utility can be used to perform live migration of apps or containers. This page is a sort of HOWTO describing this.

== Migration sequence ==

== Migration sequence ==

=== Dump ===

=== Dump ===

Take tasks you're about to migrate and dump them into some place, asking <code>crtools</code> to leave them in stopped state after dump:

Take tasks you're about to migrate and dump them into some place, asking <code>criu</code> to leave them in stopped state after dump:

  [src]# crtools dump --tree <pid> --images-dir <path-to-existing-directory> --leave-stopped

  [src]# criu dump --tree <pid> --images-dir <path-to-existing-directory> --leave-stopped

The directory you put images to can reside on the shared file-system if you're using one. In this case you can skip the Copy step and proceed to Restore.

The directory you put images to can reside on the shared file-system if you're using one. In this case you can skip the Copy step and proceed to Restore.

Go to the destination node and restore the apps from images on it:

Go to the destination node and restore the apps from images on it:

  [dst]# crtools restore --tree <pid> --images-dir <path-to-images>

  [dst]# criu restore --tree <pid> --images-dir <path-to-images>

=== Kill ===

=== Kill ===