3.4.2. Install: Composite Active/Active Clusters

Deployment of Composite Active/Active clusters is only supported using the INI method of deployment.

Configuration and deployment of the cluster works as follows:

  • Creates two basic Primary/Replica clusters.

  • Creates a composite service that includes the Primary/Replica clusters within the definition.

The resulting configuration within the example builds the following deployment:

  • One cluster, east, with three hosts.

  • One cluster, west, with three hosts.

  • All six hosts in the two clusters will have a manager, replicator and connector installed.

  • Each replicator has two replication services, one service that replicates the data within the cluster. The second service, replicates data from the other cluster to this host.

Creating the full topology requires a single install step, this creates the Tungsten Cluster cluster dataservices, and creates the Composite dataservices on different network ports to allow for the cross-cluster replication to operate.

  1. Create the combined configuration file /etc/tungsten/tungsten.ini on all cluster hosts:

    shell> vi /etc/tungsten/tungsten.ini
    [defaults]
    user=tungsten
    install-directory=/opt/continuent
    profile-script=~/.bash_profile
    replication-user=tungsten
    replication-password=secret
    replication-port=13306
    application-user=app_user
    application-password=secret
    application-port=3306
    start-and-report
    
    [east]
    topology=clustered
    master=east1
    members=east1,east2,east3
    connectors=east1,east2,east3
    
    [west]
    topology=clustered
    master=west1
    members=west1,west2,west3
    connectors=west1,west2,west3
    
    [usa]
    topology=composite-multi-master
    composite-datasources=east,west
    

    Configuration group defaults

    The description of each of the options is shown below; click the icon to hide this detail:

    Click the icon to show a detailed description of each argument.

    Configuration group east

    The description of each of the options is shown below; click the icon to hide this detail:

    Click the icon to show a detailed description of each argument.

    Configuration group west

    The description of each of the options is shown below; click the icon to hide this detail:

    Click the icon to show a detailed description of each argument.

    Configuration group usa

    The description of each of the options is shown below; click the icon to hide this detail:

    Click the icon to show a detailed description of each argument.

    The configuration above defines two clusters, east and west, which are both part of a composite cluster service, usa. Configuration can be divided up into the four sections shown, as follows:

    Warning

    Service names should not contain the keyword from within a Composite Active/Active deployment. This keyword is used (with the underscore separator, for example, east_from_west to denote cross-site replicators within the cluster. To avoid confusion, avoid using from so that it is easy to distinguish between replication pipelines.

    When configuring this service, tpm will automatically imply the following into the configuration:

    • A parent composite service, usa in this example, with child services as listed, east and west.

    • Replication services between each child service, using the service name a_from_b, for example, east_from_west and west_from_east.

      More child services will create more automatic replication services. For example, with three clusters, alpha, beta, and gamma, tpm would configure alpha_from_beta and alpha_from_gamma on the alpha cluster, beta_from_alpha and beta_from_gamma on the beta cluster, and so on.

    • For each additional service, the port number is automatically configured from the base port number for the first service. For example, using the default port 2112, the east_from_west service would have THL port 2113.

  2. Execute the installation on each host within the entire composite cluster. For example, on all six hosts provided in the sample configuration above.

    1. Install the Tungsten Cluster package (.rpm), or download the compressed tarball and unpack it:

      shell> cd /opt/continuent/software
      shell> tar zxf tungsten-clustering-6.1.9-9.tar.gz
    2. Change to the Tungsten Cluster staging directory:

      shell> cd tungsten-clustering6.1.9-9
    3. Run tpm to install the Clustering software:

      shell > ./tools/tpm install

      During the installation and startup, tpm will notify you of any problems that need to be fixed before the service can be correctly installed and started. If the service starts correctly, you should see the configuration and current status of the service.

  3. Initialize your PATH and environment:

    shell> source /opt/continuent/share/env.sh

The Composite Active/Active clustering should be installed and ready to use.