3.3. Deploying a Composite Cluster

Tungsten Clustering supports the creation of composite clusters. This includes multiple master/slave dataservices tied together. One of the dataservices is identified as the master and all other dataservices replicate from it.

Figure 3.3. Topologies: Composite Cluster

Topologies: Composite Cluster

3.3.1. Prepare: Composite Cluster

Before continuing with deployment you will need the following:

  1. The cluster name for each Master/Slave Cluster and a composite cluster name to group them.

  2. The list of datasources in each cluster. These are the servers which will be running MySQL.

  3. The list of servers that will run the connector. Each connector will be associated with a preferred cluster but will have access to the master regardless of location.

  4. The username and password of the MySQL replication user.

  5. The username and password of the first application user. You may add more users after installation.

All servers must be prepared with the proper prerequisites. See Section 2.6, “Prepare Hosts” and Appendix B, Prerequisites for additional details.

3.3.2. Install: Composite Cluster

  1. Install the Tungsten Clustering package or download the Tungsten Clustering tarball, and unpack it:

    shell> cd /opt/continuent/software
    shell> tar zxf tungsten-clustering-5.4.1-41.tar.gz
  2. Change to the Tungsten Clustering directory:

    shell> cd tungsten-clustering-5.4.1-41
  3. Run tpm to perform the installation. This method assumes you are using the Section 9.3, “tpm Staging Configuration” method:

    Click the link below to switch examples between Staging and INI methods

    Show Staging

    Show INI

    shell> ./tools/tpm configure defaults \
        --reset \
        --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
    
    shell> ./tools/tpm configure alpha \
        --topology=clustered \
        --master=host1.alpha \
        --members=host1.alpha,host2.alpha,host3.alpha \
        --connectors=host1.alpha,host2.alpha,host3.alpha
    
    shell> ./tools/tpm configure beta \
        --topology=clustered \
        --relay=host1.beta \
        --members=host1.beta,host2.beta,host3.beta \
        --connectors=host1.beta,host2.beta,host3.beta \
        --relay-source=alpha
    
    shell> ./tools/tpm configure gamma \
        --composite-datasources=alpha,beta
    
    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
    
    [alpha]
    topology=clustered
    master=host1.alpha
    members=host1.alpha,host2.alpha,host3.alpha
    connectors=host1.alpha,host2.alpha,host3.alpha
    
    [beta]
    topology=clustered
    relay=host1.beta
    members=host1.beta,host2.beta,host3.beta
    connectors=host1.beta,host2.beta,host3.beta
    relay-source=alpha
    
    [gamma]
    composite-datasources=alpha,beta
    

    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 alpha

    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 beta

    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 gamma

    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.

    Run tpm to install the software with the configuration.

    shell > ./tools/tpm install

    During the startup and installation, 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.

  4. Initialize your PATH and environment.

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

The Composite cluster should be installed and ready to use.

3.3.3. Best Practices: Composite Cluster

Follow the guidelines in Section 2.5, “Best Practices”.