8.29. The tungsten_prep

8.29. The tungsten_prep_upgrade Script
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8.29. The tungsten_prep_upgrade Script

The tungsten_prep_upgrade command is a utility script which assists in the migration process from earlier Multi-Site/Active-Active topologies to Composite Active/Active topologies.

For a full end-to-end example of using this script, see Upgrade/Convert: From Multi-Site/Active-Active (MSAA) to Composite Active/Active (CAA)

tungsten_prep_upgrade [--all|--service] {service} [--path {fullpath_to_replicator_dir}] [arguments]

Where:

If --{service|all} is not specified, tungsten_prep_upgrade will attempt to derive a list of one or more service names from trepctl services.

For operations that require MySQL access, tungsten_prep_upgrade will attempt to auto-locate the database user and password from tpm reverse.

Below are various examples:

Take all replicator services offline automatically, or take a specific service offline:
```
shell> tungsten_prep_upgrade -o 
~or~
shell> tungsten_prep_upgrade --service london --offline
shell> tungsten_prep_upgrade --service tokyo --offline
```
Note
To invoke the actual deferred offline set with --offline, use the below CLUSTER-specific trepctl command (i.e. from /opt/continuent, not /opt/replicator) on the Primary hosts within each cluster:
```
shell> trepctl heartbeat -name offline_for_upg
```

Get (keep) the current tracking position schema for the specified service and save it as json to a text file (default: ~/position-{service}-YYYYMMDDHHMMSS.txt)

shell> tungsten_prep_upgrade -g
~or~
shell> tungsten_prep_upgrade --service nyc --get
(NOTE: saves to ~/position-nyc-YYYYMMDDHHMMSS.txt)
shell> tungsten_prep_upgrade --service tokyo --get
(NOTE: saves to ~/position-tokyo-YYYYMMDDHHMMSS.txt)

Gracefully shut down the cross-site replicator process:
```
shell> tungsten_prep_upgrade --stop 
```

Backup (dump) tracking databases using mysqldump (default: tungsten_{service})

shell> tungsten_prep_upgrade -d --alldb 
~or~
shell> tungsten_prep_upgrade --service london --dump
shell> tungsten_prep_upgrade --service tokyo --dump

Load (restore) the tracking database backup for the specified service. --all is unavailable with --restore.

shell> tungsten_prep_upgrade -s nyc -u tungsten -w secret -r
shell> tungsten_prep_upgrade -s tokyo -u tungsten -w secret -r
~or~
shell> tungsten_prep_upgrade --service nyc --user tungsten --password secret --restore
shell> tungsten_prep_upgrade --service tokyo --user tungsten --password secret --restore

Note

A restore may take place after the cross-site replicator is uninstalled, and so certain information is required on the command line (i.e. service, user and password)

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