The Poky project incorporates a stable BitBake release, so to get started with Yocto, we only need to install Poky in our Linux host system.
Note that you can also install BitBake independently through your distribution's package management system. This is not recommended and can be a source of problems, as BitBake needs to be compatible with the metadata used in Yocto. If you have installed BitBake from your distribution, please remove it.
The current Yocto release is 2.4, or Rocko, so we will install that into our host system. We will use the /opt/yocto folder as the installation path:
$ sudo install -o $(id -u) -g $(id -g) -d /opt/yocto $ cd /opt/yocto $ git clone --branch rocko git://git.yoctoproject.org/poky