lxc-create creates a system object where is stored the configuration informations and where can be stored user information. The identifier name is used to specify the container to be used with the different lxc commands.
The object is a directory created in /var/lib/lxc and identified by its name.
The object is the definition of the different resources an application can use or can see. The more the configuration file contains informations, the more the container is isolated and the more the application is jailed.
If the configuration file config_file is not specified, the container will be created with the default isolation: processes, sysv ipc and mount points.
Specify the configuration file to configure the virtualization and isolation functionalities for the container.
'template' is the short name of an existing 'lxc-template' script that is called by lxc-create. eg: lxc-busybox, lxc-debian, lxc-fedora, lxc-sshd. Refer to those exemples in /usr/bin for details of expecting script structure.
As the message mention it, you try to create a container but there is a container with the same name. You can use the lxc-ls -l command to list the available containers on the system.
lxc(1), lxc-create(1), lxc-destroy(1), lxc-start(1), lxc-stop(1), lxc-execute(1), lxc-kill(1), lxc-console(1), lxc-monitor(1), lxc-wait(1), lxc-cgroup(1), lxc-ls(1), lxc-ps(1), lxc-info(1), lxc-freeze(1), lxc-unfreeze(1), lxc.conf(5)