Configuring the operating system ================================ This section describes the installation and configuration of operating systems for the target hosts, as well as deploying SSH keys and configuring storage. Installing the operating system ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Install one of the following supported operating systems on the target host: * Ubuntu server 16.04 (Xenial Xerus) LTS 64-bit * Centos 7 64-bit * openSUSE 42.X 64-bit Configure at least one network interface to access the Internet or suitable local repositories. We recommend adding the Secure Shell (SSH) server packages to the installation on target hosts that do not have local (console) access. .. note:: We also recommend setting your locale to `en_US.UTF-8`. Other locales might work, but they are not tested or supported. Configure Ubuntu ~~~~~~~~~~~~~~~~ #. Update package source lists .. code-block:: shell-session # apt-get update #. Upgrade the system packages and kernel: .. code-block:: shell-session # apt-get dist-upgrade #. Reboot the host. #. Ensure that the kernel version is ``3.13.0-34-generic`` or later: .. code-block:: shell-session # uname -r #. Install additional software packages: .. code-block:: shell-session # apt-get install bridge-utils debootstrap ifenslave ifenslave-2.6 \ lsof lvm2 ntp ntpdate openssh-server sudo tcpdump vlan python #. Add the appropriate kernel modules to the ``/etc/modules`` file to enable VLAN and bond interfaces: .. code-block:: shell-session # echo 'bonding' >> /etc/modules # echo '8021q' >> /etc/modules #. Configure Network Time Protocol (NTP) in ``/etc/ntp.conf`` to synchronize with a suitable time source and restart the service: .. code-block:: shell-session # service ntp restart #. Reboot the host to activate the changes and use the new kernel. Configure CentOS ~~~~~~~~~~~~~~~~ #. Upgrade the system packages and kernel: .. code-block:: shell-session # yum upgrade #. Reboot the host. #. Ensure that the kernel version is ``3.10`` or later: .. code-block:: shell-session # uname -r #. Install additional software packages: .. code-block:: shell-session # yum install bridge-utils iputils lsof lvm2 \ ntp ntpdate openssh-server sudo tcpdump python #. Add the appropriate kernel modules to the ``/etc/modules-load.d`` file to enable VLAN and bond interfaces: .. code-block:: shell-session # echo 'bonding' >> /etc/modules-load.d/openstack-ansible.conf # echo '8021q' >> /etc/modules-load.d/openstack-ansible.conf #. Configure Network Time Protocol (NTP) in ``/etc/ntp.conf`` to synchronize with a suitable time source and start the service: .. code-block:: shell-session # systemctl enable ntpd.service # systemctl start ntpd.service #. Reboot the host to activate the changes and use the new kernel. Configure openSUSE ~~~~~~~~~~~~~~~~~~ #. Upgrade the system packages and kernel: .. code-block:: shell-session # zypper up #. Reboot the host. #. Ensure that the kernel version is ``4.4`` or later: .. code-block:: shell-session # uname -r #. Install additional software packages: .. code-block:: shell-session # zypper install bridge-utils iputils lsof lvm2 \ ntp opensshr sudo tcpdump python #. Add the appropriate kernel modules to the ``/etc/modules-load.d`` file to enable VLAN and bond interfaces: .. code-block:: shell-session # echo 'bonding' >> /etc/modules-load.d/openstack-ansible.conf # echo '8021q' >> /etc/modules-load.d/openstack-ansible.conf #. Configure Network Time Protocol (NTP) in ``/etc/ntp.conf`` to synchronize with a suitable time source and start the service: .. code-block:: shell-session # systemctl enable ntpd.service # systemctl start ntpd.service #. Reboot the host to activate the changes and use the new kernel. Configure SSH keys ================== Ansible uses SSH to connect the deployment host and target hosts. #. Copy the contents of the public key file on the deployment host to the ``/root/.ssh/authorized_keys`` file on each target host. #. Test public key authentication from the deployment host to each target host by using SSH to connect to the target host from the deployment host. If you can connect and get the shell without authenticating, it is working. SSH provides a shell without asking for a password. For more information about how to generate an SSH key pair, as well as best practices, see `GitHub's documentation about generating SSH keys`_. .. _GitHub's documentation about generating SSH keys: https://help.github.com/articles/generating-ssh-keys/ .. important:: OpenStack-Ansible deployments require the presence of a ``/root/.ssh/id_rsa.pub`` file on the deployment host. The contents of this file is inserted into an ``authorized_keys`` file for the containers, which is a necessary step for the Ansible playbooks. You can override this behavior by setting the ``lxc_container_ssh_key`` variable to the public key for the container. Configuring the storage ======================= `Logical Volume Manager (LVM)`_ enables a single device to be split into multiple logical volumes that appear as a physical storage device to the operating system. The Block Storage (cinder) service, and LXC containers that optionally run the OpenStack infrastructure, can optionally use LVM for their data storage. .. note:: OpenStack-Ansible automatically configures LVM on the nodes, and overrides any existing LVM configuration. If you had a customized LVM configuration, edit the generated configuration file as needed. #. To use the optional Block Storage (cinder) service, create an LVM volume group named ``cinder-volumes`` on the storage host. Specify a metadata size of 2048 when creating the physical volume. For example: .. code-block:: shell-session # pvcreate --metadatasize 2048 physical_volume_device_path # vgcreate cinder-volumes physical_volume_device_path #. Optionally, create an LVM volume group named ``lxc`` for container file systems if you want to use LXC with LVM. If the ``lxc`` volume group does not exist, containers are automatically installed on the file system under ``/var/lib/lxc`` by default. .. _Logical Volume Manager (LVM): https://en.wikipedia.org/wiki/Logical_Volume_Manager_(Linux)