The inventory must define these hosts to run:

• cluster_machines: Set of hosts in the cluster
• hypervisors: Set of hosts to launch virtual machines
• observers: Set of hosts to observe the cluster (only the first is considering)
• standalone_machine: To define only the cluster is composed with one host (replace cluster_machines)

Prerequisite

This step is useful only for the installed hosts by a debian installer build with build_debian_iso.

The inventory must define these variables to run the step:

• apply_network_config: Boolean to apply the network configuration

• admin_ip_addr: IP address for SNMP

• cpumachinesnort: Range of allowed CPUs for no RT machines

• cpumachines: Range of allowed CPUs for machines (RT and no RT)

• cpumachinesrt: Range of allowed CPUs for RT machines

• cpuovs: Range of allowed CPUs for OpenVSwitch

• cpusystem: Range of allowed CPUs for the system

• cpuuser: Range of allowed CPUs for the user

• irqmask: Set the IRQBALANCE_BANNED_CPUS environment variable, see irqbalance manual

• logstash_server_ip: IP address for logstash-seapath alias in /etc/hosts

• main_disk: Main disk device to observe his temperature

• workqueuemask: The negation of the irqmask (= ~irqmask)

Network

The inventory must define these variables to run the step:

• br_rstp_priority: TODO Multiple of 4096

• cluster_ip_addr: IP address for team0 interface


• gateway_addr: IP address of a gateway, it doesn't have to work

• ip_addr: IP address to communicate with the host

• network_interface: Network interface to communicate with the host

• ntp_primary_server: Address of a NTP server, it's the first server to requests

• ntp_secondary_server: Address of a NTP server, it's the secondary server to requests

• syslog_server_ip: Address of a SYSLOG server

• team0_0: Network interface to connect to team0 bridge

• team0_1: Other network interface to connect to team0 bridge

Warnings

At the end of this step, make sure that:

• Each host in the cluster pings other (simple and fragmented package)
• Hosts use a DNS server
• Hosts are synchronized with NTP server (it's necessary for the shared storage)

Shared storage (via ceph)

The inventory may define these hosts to run the step completely:

• clients: Set of hosts that must be ceph-client. These hosts will access to the storage cluster

• mons: Set of hosts to that must be ceph-mon. These hosts will maintain a map of the state of the cluster
  

• osds: Set of hosts to that must be ceph-osd. These hosts will interact with the logical disk to stock the data

More details in the documentation here.

The inventory must define these variables to run the step:

• ceph_cluster_network: Address block to access to cluster network
• ceph_public_network: Address block to access to public network (ie to the world)

• ceph_osd_disk: Device to stock datas (only for ceph-osd hosts)

• osd_pool_default_min_size: Minimal number of available OSD to ensure cluster success (best: ceil(osd_pool_default_size / 2.0))

• osd_pool_default_size: Number of OSD in the cluster

Ceph provides ansible rules to configure the software, you can read the documentation here.

Warnings

If this step is failed, you must restart it at the previous step. Use snapshot LVM to do this.

At end of this step, make sure that:

• there is a rbd pool with this command: ceph osd pool list.
• there is a ceph pool with this command: virsh pool-list.

High availability (via corosync and pacemaker)

Deployment of Virtual Machines

The inventory must define these hosts to run this step:

• VMs: Sets of hosts to launch on hypervisors

Before starting, make sure there is enough space in /home and /tmp.