Adding a host to a cluster

You can add a management host or a compute host to a cluster. When you add a management host, configure host failover so that the system services fail over to a different management host if the primary host fails.

egosh service stop all
egosh ego shutdown all

1. Complete this step according to your cluster configuration:
   • If your cluster is installed to a local file system:
     1. Install IBM® Spectrum Conductor on a management or compute host. See Installing to a local environment.
     2. Join the host to the cluster:

        egoconfig join primary_host

     3. If you are adding a compute host, proceed to the next step to start the host. If you are adding a management host and have failover enabled, run egoconfig mghost:

        egoconfig mghost shared_location

     4. Start the host:

        egosh ego start

   • If your cluster is installed to a shared file system:
     1. Copy the files that set the environment for your management or compute host and link the Elastic Stack harvesting directory to a unique directory on your shared file system. See steps 10 and 11 in Installing IBM Spectrum Conductor to a shared environment.
     2. If you are adding a management host, you must regenerate certificates for all tiers for this new management host. For details on how to generate certificates, see:
        1. For cluster management console, generate SSL certificate for tier 1 files, using one of these methods:
           • Enabling SSL for the cluster management console using a self-signed certificate
           • Enabling SSL for the cluster management console using an external certificate
        2. For instance groups, generate SSL certificates for tier 2 services and tier 3 Spark drivers, using one of these methods:
           • Setting up SSL for instance groups: Tier 2 and Tier 3 (self-signed certificates)
           • Setting up SSL for instance groups: Tier 2 and Tier 3 (external certificates)
     3. If you are adding a compute host, proceed to the next step to start the host. If you are adding a management host, run egoconfig mghost:

        egoconfig mghost shared_location

     4. Start the host:

        egosh ego start

2. Verify that the host has joined the cluster:
   1. Log on as cluster administrator by using the egosh user logon command. For example, to log on using the default Admin user account, enter:

      egosh user logon -u Admin -x Admin

   2. Check that the host is running:

      egosh resource list

      Note: It can take a few minutes to show that the newly add host has joined.