rkt 0.5.6 includes better integration with systemd on the host, some minor bug fixes and a new ipvlan network plugin.

Full changelog:

• Updated to v0.5.2 of the appc spec
• support running from systemd unit files for top-level isolation
• support per-app logging via journalctl. This is only supported if stage1 has systemd v219 or v220
• add ipvlan network plugin
• new rkt subcommand: cat-manifest
• extract ACI in a chroot to avoid malformed links modifying the host filesystem
• improve rkt error message if the user doesn’t provide required volumes
• fix rkt status when using overlayfs
• support for some arm architectures
• documentation improvements