Plugin command to initialize a storage plugin for the backup operation.
plugin_executable setup_plugin_for_backup plugin_config_file local_backup_dir scope
plugin_executable setup_plugin_for_backup plugin_config_file local_backup_dir scope contentID
gpbackup invokes the setup_plugin_for_backup plugin command during gpbackup initialization phase. The scope argument specifies the execution scope. gpbackup will invoke the command with each of the scope values.
The setup_plugin_for_backup command should perform the activities necessary to initialize the remote storage system before backup begins. Set up activities may include creating remote directories, validating connectivity to the remote storage system, checking disks, and so forth.
- The absolute path to the plugin configuration YAML file.
- The local directory on the Greenplum Database host (master and segments) to which
gpbackup will write backup files. gpbackup creates
this local directory.
- When scope is master, the local_backup_dir is the backup directory of the Greenplum Database master.
- When scope is segment, the local_backup_dir is the backup directory of a segment instance. The contentID identifies the segment instance.
- When the scope is segment_host, the local_backup_dir is an arbitrary backup directory on the host.
- The execution scope value indicates the host and number of times the plugin command is
executed. scope can be one of these values:
- master - Execute the plugin command once on the master host.
- segment_host - Execute the plugin command once on each of the segment hosts.
- segment - Execute the plugin command once for each active segment instance on the host running the segment instance. The contentID identifies the segment instance.
- The Greenplum Database hosts and segment instances are based on the Greenplum Database configuration when the back up was first initiated.
- The contentID of the Greenplum Database master or segment instance corresponding to
the scope. contentID is passed only when the scope
is master or segment.
- When scope is master, the contentID is -1.
- When scope is segment, the contentID is the content identifier of an active segment instance.
The setup_plugin_for_backup command must exit with a value of 0 on success, non-zero if an error occurs. In the case of a non-zero exit code, gpbackup displays the contents of stderr to the user.