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Good overview of namespaces and resource groups used to power container technology - https://content.pivotal.io/blog/cloud-foundrys-container-technology-a-garden-overview
LXC and LXD using host bridge - https://insights.ubuntu.com/2015/11/10/converting-eth0-to-br0-and-getting-all-your-lxc-or-lxd-onto-your-lan/