Primary/Replica is the simplest and most straightforward of all replication scenarios, and also the basis of all other types of topology. The fundamental basis for the Primary/Replica topology is that changes in the Primary are distributed and applied to the each of the configured Replicas.
This deployment style can be used against the following sources
MySQL Community Edition
MySQL Enterprise Edition
Percona MySQL
MariaDB
Google Cloud MySQL
This deployment assumes full access to the host, including access to Binary Logs, therefore this deployment style is not suitable for RDS or Aurora extraction. For these sources, see Section 3.3, “Deploying an Extractor for Amazon Aurora”
tpm includes a specific topology structure for the basic Primary/Replica configuration, using the list of hosts and the Primary host definition to define the Primary/Replica relationship. Before starting the installation, the prerequisites must have been completed (see Appendix B, Prerequisites). To create a Primary/Replica using tpm:
There are two types of installation, either via a Staging Install, or via an ini file install.
To understand the differences between these two installation methods, see
Section 9.1, “Comparing Staging and INI
tpm Methods”
Regardless of which installation method you choose, the steps are the same, and are outlined below, using the appropriate example confguration based on your deployment style
Note
If you plan to make full use of the REST API (which is enabled by default) you will need to also configure a username and password for API access. This must be done by specifying the following options in your configuration:
rest-api-admin-user=tungsten rest-api-admin-pass=secret
Install the Tungsten Replicator package (see Section 2.1.2, “Using the RPM package files”), or download the compressed tarball and unpack it, either on the source host, or on the staging host:
shell>
cd /opt/continuent/softwareshell>tar zxf tungsten-replicator-7.1.4-10.tar.gzChange to the Tungsten Replicator staging directory:
shell>
cd tungsten-replicator-7.1.4-10Onboard Installation
Configure the replicator for extraction from a locally installed and configured MySQL Installation (In this example, the service name is alpha)
Click the link below to switch examples between Staging and INI methods
shell>
./tools/tpm configure defaults \ --reset \ --install-directory=/opt/continuent \ --user=tungsten \ --profile-script=~/.bash_profile \ --mysql-allow-intensive-checks=true \ --rest-api-admin-user=apiuser \ --rest-api-admin-pass=secretshell>./tools/tpm configure alpha \ --master=localhost \ --members=localhost \ --enable-heterogeneous-service=true \ --replication-port=3306 \ --replication-user=tungsten_alpha \ --replication-password=secret \ --datasource-mysql-conf=/etc/my.cnfshell>
vi /etc/tungsten/tungsten.ini[defaults] install-directory=/opt/continuent user=tungsten profile-script=~/.bash_profile mysql-allow-intensive-checks=true rest-api-admin-user=apiuser rest-api-admin-pass=secret[alpha] master=localhost members=localhost enable-heterogeneous-service=true replication-port=3306 replication-user=tungsten_alpha replication-password=secret datasource-mysql-conf=/etc/my.cnfConfiguration group
defaultsThe description of each of the options is shown below; click the icon to hide this detail:
For staging configurations, deletes all pre-existing configuration information between updating with the new configuration values.
--install-directory=/opt/continuentinstall-directory=/opt/continuentPath to the directory where the active deployment will be installed. The configured directory will contain the software, THL and relay log information unless configured otherwise.
System User
--profile-script=~/.bash_profileprofile-script=~/.bash_profileAppend commands to include env.sh in this profile script
--mysql-allow-intensive-checks=truemysql-allow-intensive-checks=trueFor MySQL installation, enables detailed checks on the supported data types within the MySQL database to confirm compatibility. This includes checking each table definition individually for any unsupported data types.
- Optional: Must be specified along with rest-api-admin-pass if you wish to access the full API features and use the Dashboard GUI for cluster installations.
- Optional: Must be specified along with rest-api-admin-user if you wish to access the full API features.
Configuration group
alphaThe description of each of the options is shown below; click the icon to hide this detail:
The hostname of the primary (extractor) within the current service.
Hostnames for the dataservice members
--enable-heterogeneous-service=trueenable-heterogeneous-service=trueOn a Primary
--mysql-use-bytes-for-stringis set to false.colnamesfilter is enabled (in thebinlog-to-qstage to add column names to the THL information.pkeyfilter is enabled (in thebinlog-to-qandq-to-dbmsstage), with theaddPkeyToInsertsandaddColumnsToDeletesfilter options set to false.enumtostringfilter is enabled (in theq-to-thlstage), to translateENUMvalues to their string equivalents.settostringfilter is enabled (in theq-to-thlstage), to translateSETvalues to their string equivalents.
On a Replica
--mysql-use-bytes-for-stringis set to true.
The network port used to connect to the database server. The default port used depends on the database being configured.
--replication-user=tungsten_alphareplication-user=tungsten_alphaFor databases that required authentication, the username to use when connecting to the database using the corresponding connection method (native, JDBC, etc.).
The password to be used when connecting to the database using the corresponding
--replication-user.--datasource-mysql-conf=/etc/my.cnfdatasource-mysql-conf=/etc/my.cnfMySQL config file
In the above example,
--datasource-mysql-conf, is optional and can be used if the MySQL configuration file cannot be located by tpm, or is in a non-default locationOffboard Installation
Configure the replicator for extraction from a remotely installed and configured MySQL Installation (In this example, the service name is alpha)
In the example below, the server
offboardhostis the host that the Replicator is installed upon, and the serverdbhostis the database host to apply the events to.Click the link below to switch examples between Staging and INI methods
shell>
./tools/tpm configure defaults \ --reset \ --install-directory=/opt/continuent \ --user=tungsten \ --profile-script=~/.bash_profile \ --mysql-allow-intensive-checks=true \ --skip-validation-check=MySQLAvailableCheck \ --skip-validation-check=MySQLConfFile \ --skip-validation-check=RowBasedBinaryLoggingCheck \ --rest-api-admin-user=apiuser \ --rest-api-admin-pass=secretshell>./tools/tpm configure alpha \ --master=offboardhost \ --members=offboardhost \ --enable-heterogeneous-service=true \ --privileged-master=true \ --replication-host=dbhost \ --replication-port=3306 \ --replication-user=tungsten_alpha \ --replication-password=secretshell>
vi /etc/tungsten/tungsten.ini[defaults] install-directory=/opt/continuent user=tungsten profile-script=~/.bash_profile mysql-allow-intensive-checks=true skip-validation-check=MySQLAvailableCheck skip-validation-check=MySQLConfFile skip-validation-check=RowBasedBinaryLoggingCheck rest-api-admin-user=apiuser rest-api-admin-pass=secret[alpha] master=offboardhost members=offboardhost enable-heterogeneous-service=true privileged-master=true replication-host=dbhost replication-port=3306 replication-user=tungsten_alpha replication-password=secretConfiguration group
defaultsThe description of each of the options is shown below; click the icon to hide this detail:
For staging configurations, deletes all pre-existing configuration information between updating with the new configuration values.
--install-directory=/opt/continuentinstall-directory=/opt/continuentPath to the directory where the active deployment will be installed. The configured directory will contain the software, THL and relay log information unless configured otherwise.
System User
--profile-script=~/.bash_profileprofile-script=~/.bash_profileAppend commands to include env.sh in this profile script
--mysql-allow-intensive-checks=truemysql-allow-intensive-checks=trueFor MySQL installation, enables detailed checks on the supported data types within the MySQL database to confirm compatibility. This includes checking each table definition individually for any unsupported data types.
--skip-validation-check=MySQLAvailableCheckskip-validation-check=MySQLAvailableCheckThe
--skip-validation-checkdisables a given validation check. If any validation check fails, the installation, validation or configuration will automatically stop.Warning
Using this option enables you to bypass the specified check, although skipping a check may lead to an invalid or non-working configuration.
You can identify a given check if an error or warning has been raised during configuration. For example, the default table type check:
... ERROR >> centos >> The datasource root@centos:3306 (WITH PASSWORD) » uses MyISAM as the default storage engine (MySQLDefaultTableTypeCheck) ...
The check in this case is
MySQLDefaultTableTypeCheck, and could be ignored using--skip-validation-check=MySQLDefaultTableTypeCheck.Setting both
--skip-validation-checkand--enable-validation-checkis equivalent to explicitly disabling the specified check.--skip-validation-check=MySQLConfFileskip-validation-check=MySQLConfFileThe
--skip-validation-checkdisables a given validation check. If any validation check fails, the installation, validation or configuration will automatically stop.Warning
Using this option enables you to bypass the specified check, although skipping a check may lead to an invalid or non-working configuration.
You can identify a given check if an error or warning has been raised during configuration. For example, the default table type check:
... ERROR >> centos >> The datasource root@centos:3306 (WITH PASSWORD) » uses MyISAM as the default storage engine (MySQLDefaultTableTypeCheck) ...
The check in this case is
MySQLDefaultTableTypeCheck, and could be ignored using--skip-validation-check=MySQLDefaultTableTypeCheck.Setting both
--skip-validation-checkand--enable-validation-checkis equivalent to explicitly disabling the specified check.--skip-validation-check=RowBasedBinaryLoggingCheckskip-validation-check=RowBasedBinaryLoggingCheckThe
--skip-validation-checkdisables a given validation check. If any validation check fails, the installation, validation or configuration will automatically stop.Warning
Using this option enables you to bypass the specified check, although skipping a check may lead to an invalid or non-working configuration.
You can identify a given check if an error or warning has been raised during configuration. For example, the default table type check:
... ERROR >> centos >> The datasource root@centos:3306 (WITH PASSWORD) » uses MyISAM as the default storage engine (MySQLDefaultTableTypeCheck) ...
The check in this case is
MySQLDefaultTableTypeCheck, and could be ignored using--skip-validation-check=MySQLDefaultTableTypeCheck.Setting both
--skip-validation-checkand--enable-validation-checkis equivalent to explicitly disabling the specified check.- Optional: Must be specified along with rest-api-admin-pass if you wish to access the full API features and use the Dashboard GUI for cluster installations.
- Optional: Must be specified along with rest-api-admin-user if you wish to access the full API features.
Configuration group
alphaThe description of each of the options is shown below; click the icon to hide this detail:
The hostname of the primary (extractor) within the current service.
Hostnames for the dataservice members
--enable-heterogeneous-service=trueenable-heterogeneous-service=trueOn a Primary
--mysql-use-bytes-for-stringis set to false.colnamesfilter is enabled (in thebinlog-to-qstage to add column names to the THL information.pkeyfilter is enabled (in thebinlog-to-qandq-to-dbmsstage), with theaddPkeyToInsertsandaddColumnsToDeletesfilter options set to false.enumtostringfilter is enabled (in theq-to-thlstage), to translateENUMvalues to their string equivalents.settostringfilter is enabled (in theq-to-thlstage), to translateSETvalues to their string equivalents.
On a Replica
--mysql-use-bytes-for-stringis set to true.
Does the login for the Primary database service have superuser privileges
Hostname of the datasource where the database is located. If the specified hostname matches the current host or member name, the database is assumed to be local. If the hostnames do not match, extraction is assumed to be via remote access. For MySQL hosts, this configures a remote replication Replica (relay) connection.
The network port used to connect to the database server. The default port used depends on the database being configured.
--replication-user=tungsten_alphareplication-user=tungsten_alphaFor databases that required authentication, the username to use when connecting to the database using the corresponding connection method (native, JDBC, etc.).
The password to be used when connecting to the database using the corresponding
--replication-user.
Once the prerequisites and configuring of the installation has been completed, the software can be installed:
shell>
./tools/tpm install
In both of the above examples,
enable-heterogenous-service, is only
required if the target applier is NOT a
MySQL database
If the installation process fails, check the output of the
/tmp/tungsten-configure.log file for
more information about the root cause.
Once the installation has been completed, you can now proceed to configure the Applier service following the relevant step within Chapter 4, Deploying Appliers.
Following installation of the applier, the services can be started. For information on starting and stopping Tungsten Cluster see Section 2.4, “Starting and Stopping Tungsten Replicator”; configuring init scripts to startup and shutdown when the system boots and shuts down, see Section 2.5, “Configuring Startup on Boot”.
For information on checking the running service, see Section 3.2.1, “Monitoring the MySQL Extractor”.