3.5.4. Adding Connectors to an Existing Deployment

Adding more connectors to an existing installation allows for increased routing capacity. The new connectors will form part of the cluster and be fully aware and communicate with existing managers and datasources within the cluster.

To add more connectors to an existing deployment:

  1. On the new host, ensure the Appendix B, Prerequisites have been followed.

  2. Update the configuration using tpm, adding the new host to the list of connectors

    If using the staging method of deployment, you can use +=, which appends the host to the existing deployment as shown in the example below. Click the link to switch between staging and ini type deployment examples.

    Show Staging

    Show INI

    shell> tpm query staging
    tungsten@db1:/opt/continuent/software/tungsten-clustering-6.0.5-41
    
    shell> echo The staging USER is `tpm query staging| cut -d: -f1 | cut -d@ -f1`
    The staging USER is tungsten
    
    shell> echo The staging HOST is `tpm query staging| cut -d: -f1 | cut -d@ -f2`
    The staging HOST is db1
    
    shell> echo The staging DIRECTORY is `tpm query staging| cut -d: -f2`
    The staging DIRECTORY is /opt/continuent/software/tungsten-clustering-6.0.5-41
    
    shell> ssh {STAGING_USER}@{STAGING_HOST}
    shell> cd {STAGING_DIRECTORY}
    shell> ./tools/tpm configure alpha \
        --connectors+=host4 \
    

    Run the tpm command to update the software with the Staging-based configuration:

    shell> ./tools/tpm update --no-connectors

    For information about making updates when using a Staging-method deployment, please see Section 9.3.7, “Configuration Changes from a Staging Directory”.

    shell> vi /etc/tungsten/tungsten.ini
    [alpha]
    ...
    connectors=host4
    

    Run the tpm command to update the software with the INI-based configuration:

    shell> tpm query staging
    tungsten@db1:/opt/continuent/software/tungsten-clustering-6.0.5-41
    
    shell> echo The staging DIRECTORY is `tpm query staging| cut -d: -f2`
    The staging DIRECTORY is /opt/continuent/software/tungsten-clustering-6.0.5-41
    
    shell> cd {STAGING_DIRECTORY}
    
    shell> ./tools/tpm update --no-connectors

    For information about making updates when using an INI file, please see Section 9.4.4, “Configuration Changes with an INI file”.

  3. Using the --no-connectors option updates the current deployment without restarting the existing connectors.

  4. During a period when it is safe to restart the connectors:

    shell> ./tools/tpm promote-connector

The status of all the connectors can be monitored using cctrl:

[LOGICAL] /alpha > ls

COORDINATOR[host1:AUTOMATIC:ONLINE]

ROUTERS:
+----------------------------------------------------------------------------+
|connector@host1[8616](ONLINE, created=0, active=0)                          |
|connector@host2[12381](ONLINE, created=0, active=0)                         |
|connector@host3[19708](ONLINE, created=0, active=0)                         |
|connector@host4[5085](ONLINE, created=0, active=0)                          |
+----------------------------------------------------------------------------+