Start an OpenStack environment¶

To resume an OpenStack environment after it has been shut down, you need to bring the environment back to operation. This section provides instructions on how to start an entire OpenStack environment.

To start an OpenStack environment:

1. Verify that hardware is up and running.

2. Power on the Fuel Master node.

3. Start controller nodes.

   Assuming your environment contains 3 controller nodes, start them as follows:

   Note

   The first controller node to start is the controller node that was shut down last.

   1. Start the Controller-01 node.

      Wait until the node accomplishes the boot process and some extra minutes for Pacemaker/Corosync to complete the start up and to shut down the required services due to no quorum.

   2. Start the Controller-02 node.

      Wait until the node accomplishes the boot process and some extra minutes for Pacemaker/Corosync to complete the start up and to redistribute the OpenStack services between the nodes.

   3. Start the Controller-03 node.

      Wait until the node accomplishes the boot process and some extra minutes for Pacemaker/Corosync to complete the start up and to redistribute the OpenStack services between the nodes.

   4. Remove the maintenance mode from the Pacemaker resources:

      pcs property set maintenance-mode=false
      

   5. Verify the Galera service.

      Warning

      If your configuration includes a MySQL database of a huge size, Galera may stay in the syncing state for several hours until it verifies both MySQL replicas between the available controllers. Do not interrupt syncing, wait until Galera finishes the process.

4. Start Ceph OSD nodes.

   You can start all Ceph OSD nodes at the same time. Ceph starts Ceph OSD services one by one, depending on the current load to Ceph monitors.

5. Verify that all Ceph OSD nodes are up and running by logging in to any controller node and typing:

   ceph osd tree
   

   If some Ceph OSD nodes are not up and running, check it manually.

6. Remove the noout flag:

   1. Log in to any controller or any Ceph node and type:

      ceph osd unset noout
      

   2. Verify the flag is set:

      ceph -s
      

      The output of the command above should NOT show the noout flag set into the health status.

7. Start compute nodes.

8. Verify the OpenStack services.

9. Start virtual machines through either Horizon or CLI.