Or, abbreviated sudo lxc-create -t download -n u1 To create a privileged container, you can simply do: sudo lxc-create -template download -name u1 However they are less dangerous to the host, as the root UID in the container is mapped to a non-root UID on the host. (The starting of unprivileged containers by the root user is possible, but not described here.) Unprivileged containers are more limited, for instance being unable to create device nodes or mount block-backed filesystems. LXC can be used in two distinct ways - privileged, by running the lxc commands as the root user or unprivileged, by running the lxc commands as a non-root user. If you wish to use unprivileged containers, you will need to ensure that users have sufficient allocated subuids and subgids, and will likely want to allow users to connect containers to a bridge (see Basic unprivileged usage below). This will pull in the required and recommended dependencies, as well as set up a network bridge for containers to use. The lxc package can be installed using sudo apt install lxc In this document, a container name will be shown as CN, C1, or C2. Use of libvirt-lxc is not generally recommended due to a lack of Apparmor protection for libvirt-lxc containers. In this document we will mainly describe the lxc package. It is possible to switch between the two, though there are peculiarities which can cause confusion. The other implementation, called simply ‘LXC’, is not compatible with libvirt, but is more flexible with more userspace tools. This can be very convenient as it supports the same usage as its other drivers. Libvirt allows the use of containers through the LXC driver by connecting to lxc:///. There are two user-space implementations of containers, each exploiting the same kernel features. In fact, containers came about as a result of the work to upstream the vserver and OpenVZ functionality. Linux-vserver and OpenVZ are two pre-existing, independently developed implementations of containers-like functionality for Linux. Containers are similar to Solaris zones or BSD jails. They are more akin to an enhanced chroot than to full virtualization like Qemu or VMware, both because they do not emulate hardware and because containers share the same operating system as the host. Multi-node configuration with Docker-Composeĭistributed Replicated Block Device (DRBD)Ĭontainers are a lightweight virtualization technology.
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