# Step L: Re-enable high availability
<a name="upg-std-reenable"></a>

You re-enable high availability when you have more than one Conductor Live node. If you have only one Conductor node you don't need to do re-enable high availability and the upgrade process is complete when you start the channels.

**Important**  
Enabling high availability must be the last step that you take when changing versions on your cluster.

**To enable HA**

1. If you're using a virtual machine (VM), take a snapshot before you enable HA. See the VMware VSphere help text for more information.

1. On the web interface for the primary Conductor Live node, go to the **Cluster** page and choose **Redundancy**. In the **High Availability** field, choose **Enable**.

**To verify that HA is correctly enabled, follow these steps on each Conductor Live node.**

1. At your workstation, start a remote terminal session to the Conductor Live node.

1. Enter the following command to verify that Conductor Live HA is enabled:

   ```
   [elemental@hostname log]$ tail -F /opt/elemental_se/web/log/conductor_live247.output
   ```

   The conductor\_live247.output log starts to scroll on the screen and shows messages as they are occurring. Watch for the following INFO lines on the primary Conductor Live node:

   ```
   CONDUCTOR: Initializing environment
   I, [2015-11-13T04:37:54.491204 #4978]  INFO -- : Configuring the HA environment
   I, [2015-11-13T04:37:54.660644 #4978]  INFO -- : configuring keepalived
   .
   .
   .
   I, [2015-11-13T04:38:03.905069 #4978]  INFO -- : Elemental Conductor is ready
   ```

1. Press **Ctrl - C** to exit the tail command.

1. Enter the following commands:

   ```
   [elemental@hostname ~]$ sudo -s
   [elemental@hostname ~]$ cd /data/pgsql/logs
   [elemental@hostname ~]$ tail -F postgresql-{{<day>}}.log
   ```

   where <day> is today (the day you are upgrading), typed with an initial capital letter: Mon, Tue, Wed, Thu, Fri, Sat, Sun

1. Confirm that you see `database system is ready to accept connections` on the primary Conductor Live, and `database system is ready to accept read only connections` on the secondary Conductor Live.

1. Press **Ctrl - C** to exit the tail command.

1. Type the following command to exit the session as the sudo user:

   ```
   [elemental@hostname ~]$ exit
   ```