Added lxc notes to the knowledge base

knowledge base/lxc.md

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+# Linux Container Runtime
+
+## TL;DR
+
+```shell
+# install lxc
+apt-get install lxc
+snap install lxd
+
+# list available templates
+ls /usr/share/lxc/templates
+
+# create a new container
+# use the download template to choose from a list of distribution
+lxc-create --name container-name --template download
+
+# start a container
+lxc-start --name container-name
+lxc-start --name container-name --foreground
+lxc-start --name container-name --daemon --define CONFIGVAR=VALUE
+
+# stop a container
+lxc-stop --name container-name
+lxc-stop --name container-name --kill
+
+# destroy a container
+# needs the container to be stopped
+lxc-destroy --name container-name
+
+# get a container status
+lxc-info --name container-name
+
+# get the status of all containers
+lxc-ls --fancy
+
+# get a shell inside a container
+lxc-attach --name container-name
+
+# get config options on man
+man 5 lxc.container.conf
+man lxc.container.conf.5
+man lxc.container.conf(5)
+```
+
+## Create new containers as unprivileged user
+
+```shell
+# allow user vagrant to create up to 10 veth devices connected to the lxcbr0 bridge
+echo "vagrant veth lxcbr0 10" | sudo tee -a /etc/lxc/lxc-usernet
+```
+
+## Further readings
+
+- LXC's [website]
+- LXC's [getting started] guide
+
+[website]: https://linuxcontainers.org/
+[getting started]: https://linuxcontainers.org/lxc/getting-started/