3.1. Deploying a Master/Slave Cluster

Within a master/slave service, there is a single master which replicates data to the slaves. The Tungsten Connector handles connectivity by the application and distributes the load to the datasources in the dataservice.

Figure 3.1. Topologies: Master/Slave Cluster

3.1.1. Prepare: Master/Slave Cluster

Before continuing with deployment you will need the following:

The name to use for the cluster.
The list of datasources in the cluster. These are the servers which will be running MySQL.
The list of servers that will run the connector.
The username and password of the MySQL replication user.
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.

3.1.2. Install: Master/Slave Cluster

3.1.2.1. Installing a Master/Slave Cluster (Staging Use Case)
3.1.2.2. Installing a Master/Slave Cluster (INI Use Case)

Staging Configuration - Section 3.1.2.1, “Installing a Master/Slave Cluster (Staging Use Case)”
INI Configuration - Section 3.1.2.2, “Installing a Master/Slave Cluster (INI Use Case)”

3.1.2.1. Installing a Master/Slave Cluster (Staging Use Case)

Install the Tungsten Clustering package or download the Tungsten Clustering tarball, and unpack it:
```
shell> cd /opt/continuent/software
shell> tar zxf tungsten-clustering-5.3.6-24.tar.gz
```
Change to the Tungsten Clustering directory:
```
shell> cd tungsten-clustering5.3.6-24
```
Run tpm to perform the installation. This method assumes you are using the Section 9.3, “tpm Staging Configuration” method:
```
shell> ./tools/tpm install alpha \
  --user=tungsten \
  --install-directory=/opt/continuent \
  --members=host1,host2,host3 \
  --connectors=host1,host2,host3 \
  --master=host1 \
  --replication-user=tungsten \
  --replication-password=password \
  --replication-port=13306 \
  --application-user=app_user \
  --application-password=password \
  --application-port=3306  \
  --start-and-report=true \
  --profile-script=~/.bash_profile
```
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.
- tpm install
  This runs the tpm command. install indicates that we are installing and creating a new dataservice, and alpha is the name and identity of the dataservice being created.
- --user=tungsten
  The operating system user name that you have created for the Tungsten service, tungsten.
- --install-directory=/opt/continuent
  The installation directory of the Tungsten service. This is where the service will be installed on each server in your dataservice.
- --members=host1,host2,host3
  A comma separated list of all the hosts that are part of this dataservice.
- --connectors=host1,host2,host3
  A comma separated list of the hosts that will have a connector service created on them.
- --master=host1
  The hostname of the server that will be the master MySQL server.
- --dataservice-witnesses=witness
  The hostname of a computer that will be contacted using ping in the event of a network problem.
- --replication-user=tungsten
  The MySQL user name to use when connecting to the MySQL database.
- --replication-password=password
  The MySQL password for the user that will connect to the MySQL database.
- --replication-port=13306
  The TCP/IP port that the MySQL database is listening on for connections.
- --application-user=app_user
  The application user name.
- --application-password=password
  The application password.
- --application-port=3306
  The TCP/IP port on which to listen for incoming connections by the Tungsten connector service. To emulate the standard MySQL database service, port 3306 is used.
- --start-and-report
  Tells tpm to startup the service, and report the current configuration and status.
- --profile-script
  Tells tpm to add PATH information to the script to initialize the environment.
Note
Do not include start-and-report if you are taking over for MySQL native replication. See Section 3.9.1, “Migrating from MySQL Native Replication 'In-Place'” for next steps after completing installation.
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.

Initialize your PATH and environment.

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

3.1.2.2. Installing a Master/Slave Cluster (INI Use Case)

Install the Tungsten Clustering™ package (.rpm), or download the compressed tarball and unpack it:
```
shell> cd /opt/continuent/software
shell> tar zxf tungsten-clustering-5.3.6-24.tar.gz
```
Change to the Tungsten Clustering directory:
```
shell> cd tungsten-clustering5.3.6-24
```
Create /etc/tungsten/tungsten.ini with the configuration. Replace host4 with the connector system's full hostname.
```
[defaults]
user=tungsten
install-directory=/opt/continuent
replication-user=tungsten
replication-password=password
replication-port=13306
application-user=app_user
application-password=secret
application-port=3306
start-and-report=true
profile-script=~/.bash_profile

[alpha]
topology=clustered
members=host1,host2,host3
connectors=host4
master=host1
```
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.
- [alpha]
  alpha is the name and identity of the dataservice being created.
- user=tungsten
  The operating system user name that you have created for the Tungsten service, tungsten.
- install-directory=/opt/continuent
  The installation directory of the Tungsten service. This is where the service will be installed on each server in your dataservice.
- members=host1,host2,host3
  A comma separated list of all the database hosts that are part of this dataservice.
- connectors=host4
  A comma separated list of the hosts that have a connector service created on them. The connectors option does not need to include all other connectors, but must include the full hostname for the local server.
- master=host1
  The hostname of the server that will be the initial master MySQL server.
- replication-user=tungsten
  The MySQL user name to use when connecting to the MySQL database.
- replication-password=password
  The MySQL password for the user that will connect to the MySQL database.
- replication-port=13306
  The TCP/IP port that the MySQL database is listening on for connections.
- application-user=app_user
  The application user name.
- application-password=password
  The application password.
- application-port=3306
  The TCP/IP port on which to listen for incoming connections by the Tungsten connector service. To emulate the standard MySQL database service, port 3306 is used.
- start-and-report
  Tells tpm to startup the service, and report the current configuration and status.
- profile-script
  Tells tpm to add PATH information to the script to initialize the environment.
See Section 9.4, “tpm INI File Configuration” for more information.
Note
Do not include start-and-report if you are taking over for MySQL native replication. See Section 3.9.1, “Migrating from MySQL Native Replication 'In-Place'” for next steps after completing installation.
Run tpm to install the software with the INI-based 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 start-and-report is set and the service starts correctly, you should see the configuration and current status of the service.

Initialize your PATH and environment.

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

3.1.3. Best Practices: Master/Slave Cluster

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

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