The tpm command is designed to coordinate the deployment activity across all hosts in a dataservice. This is done by completing a stage on all hosts before moving on. These operations will happen on each host in parallel and tpm will wait for the results to come back before moving on.
Copy deployment files to each server
At this stage, only the tpm command is copied over so we can run validation checks locally on each machine.
The configuration is also transferred to each server and checked for completeness. This will run some commands to make sure that we have all of the settings needed to run a full validation.
Validate the configuration settings
Each host will validate the configuration based on validation classes. This will do things like check file permissions and database credentials. If errors are found during this stage, they will be summarized and the script will exit.
##################################################################### # Validation failed ##################################################################### ##################################################################### # Errors for host3 ##################################################################### ERROR >> host3 >> Password specified for app@% does not match the running instance on » tungsten@host3:13306 (WITH PASSWORD). This may indicate that the user has a password » using the old format. (MySQLConnectorPermissionsCheck) ##################################################################### # Errors for host2 ##################################################################### ERROR >> host2 >> Password specified for app@% does not match the running instance on » tungsten@host2:13306 (WITH PASSWORD). This may indicate that the user has a password » using the old format. (MySQLConnectorPermissionsCheck) ##################################################################### # Errors for host1 ##################################################################### ERROR >> host1 >> Password specified for app@% does not match the running instance on » tungsten@host1:13306 (WITH PASSWORD). This may indicate that the user has a password » using the old format. (MySQLConnectorPermissionsCheck)
At this point you should verify the configuration settings and retry the tpm install command. Any errors found during this stage may be skipped by running tpm configure alpha --skip-validation-check=MySQLConnectorPermissionsCheck. When re-running the tpm install command this check will be bypassed.
Deploy and write configuration files
If validation is successful, we will move on to deploying and writing the actual configuration files. The tpm command uses a JSON file that summarizes the configuration. The Tungsten processes use many different files to store the configuration and tpm is responsible for writing them.
The /opt/continuent/releases directory will start
to collect multiple directories after you have run multiple upgrades. We
keep the previous versions in case a downgrade is
needed or for review at a later date. If your upgrade has been
successful, you can remove old directories. Make sure you do not remove
the directory that is linked to by the
/opt/continuent/tungsten symlink.
Do not change configuration files by hand. This will cause future updates to fail. One of the validation checks compares the file that tpm written with the current file. If there are differences, validation will fail.
This is done to make sure that any configuration changes made by hand are not wiped out without giving you a chance to save them. You can run tpm query modified-files to see what, if any, changes have been made.
Start Tungsten services
After the installation is fully configured, the tpm
command will start services on all of the hosts if the tpm
option --start was set. This process is
slightly different depending on if you are doing a clean install or and
upgrade.
Install
Check if --start or
--start-and-report were
provided in the configuration
Start Tungsten Replicator on all hosts
Upgrade
Put all dataservices into MAINTENANCE mode
Stop the Tungsten Replicator on all nodes