ubuntu lsnrctl如何迁移

Note: lsnrctl (Listener Control Utility) is a command-line tool provided by Oracle Database to manage the Oracle Listener (a background process that listens for incoming client connection requests). On Ubuntu, lsnrctl is typically installed as part of the Oracle Database software or Oracle Instant Client—not as a standalone system package. Migrating lsnrctl involves migrating the underlying Oracle components (Listener, Instant Client, or Database) it depends on.

Pre-Migration Preparation

Backup Critical Files:
Before making any changes, back up all relevant configuration and data files to prevent loss:
- Listener configuration: listener.ora (usually in $ORACLE_HOME/network/admin).
- TNSnames (if applicable): tnsnames.ora (same directory as listener.ora).
- Oracle Inventory: /var/opt/oracle/oraInventory (records installed Oracle components).
- Database files (if migrating the database): Datafiles, control files, redo logs, and archive logs.
  Use commands like tar or rsync to create compressed backups (e.g., tar -czvf listener_backup.tar.gz $ORACLE_HOME/network/admin).
Check Compatibility:
Verify that the target version of Oracle Database/Instant Client is compatible with your existing database version. Refer to Oracle’s official compatibility matrix (e.g., “Oracle Database Upgrade Compatibility Matrix”) to avoid conflicts.
Download New Components:
If migrating to a newer version of lsnrctl, download the corresponding Oracle Database or Instant Client package from the official Oracle website. For example:
- Oracle Instant Client (Basic package includes lsnrctl): Choose the Linux x86_64 version compatible with Ubuntu.
- Oracle Database Software: Select the version that matches your migration goals (e.g., 21c, 19c).

Stop Existing Listener and Database Services

Stop the Listener:
Use lsnrctl to gracefully stop the listener to prevent new connections during migration:
```
lsnrctl stop
```
Confirm the listener has stopped by checking its status:
```
lsnrctl status
```
(Expected output: “The listener is not running.”)
Stop the Database (If Migrating the Database):
If you’re migrating the Oracle Database itself, shut down the instance using SQL*Plus or srvctl (for RAC environments):
```
sqlplus / as sysdba
SHUTDOWN IMMEDIATE;
EXIT;
```
Or, for RAC:
```
srvctl stop database -d <database_name>
```

Migrate Oracle Components

Option 1: Migrate Oracle Instant Client (For Standalone `lsnrctl`)

Uninstall Old Instant Client (Optional):
If you’re replacing an older version, remove the old Instant Client files to avoid conflicts. For example:
```
sudo rm -rf /opt/oracle/instantclient_19_12
```

Install New Instant Client:
Extract the downloaded Instant Client package to a target directory (e.g., /opt/oracle/instantclient_21_11):

sudo mkdir -p /opt/oracle/instantclient_21_11
sudo tar -xvf instantclient-basic-linux.x64-21.11.0.0.0.zip -C /opt/oracle/instantclient_21_11 --strip-components=1

Update Environment Variables:
Edit your shell profile (e.g., ~/.bashrc) to include the new Instant Client path:

export ORACLE_HOME=/opt/oracle/instantclient_21_11
export LD_LIBRARY_PATH=$ORACLE_HOME:$LD_LIBRARY_PATH
export PATH=$ORACLE_HOME:$PATH

Apply changes:

source ~/.bashrc

Option 2: Migrate Full Oracle Database (Includes `lsnrctl`)

Run Installer:
Execute the Oracle Database installer and select the “Upgrade” option to upgrade the existing database. Follow the on-screen prompts to complete the installation.
Example:
```
sudo ./runInstaller -silent -upgrade -responseFile /path/to/upgrade_response_file.rsp
```
Complete Post-Installation Steps:
After the installer finishes, run the Database Configuration Assistant (DBCA) or manually complete post-upgrade tasks (e.g., running scripts in $ORACLE_HOME/rdbms/admin).

Configure Listener (If Needed)

Verify Configuration Files:
Check the listener.ora file (in $ORACLE_HOME/network/admin) for any changes required by the new version (e.g., new parameters, deprecated options). Common changes include updating protocol versions or adding security settings.
Register Database with Listener:
If the database was migrated, manually register it with the listener to ensure connections work:
```
lsnrctl register
```
Or, specify the service name and host explicitly:
```
lsnrctl register <service_name> -host <hostname> -port <port>
```
(Replace <service_name> with your database service name, <hostname> with the server’s hostname/IP, and <port> with the listener port—default is 1521.)

Start Services and Verify

Start the Listener:
Use lsnrctl to start the listener and confirm it’s running:
```
lsnrctl start
lsnrctl status
```
Expected output: “Listener is ready” with details about the listening address and services.
Start the Database (If Migrated):
Start the Oracle Database instance:
```
sqlplus / as sysdba
STARTUP;
EXIT;
```
Or, for RAC:
```
srvctl start database -d <database_name>
```
Test Connectivity:
Use tnsping or SQL*Plus to verify the listener is working:
```
tnsping <service_name>
```
Or connect to the database:
```
sqlplus <username>/<password>@<service_name>
```
(Expected output: Successful connection to the database.)

Post-Migration Tasks

Clear Old Files:
Once you’ve confirmed the new version works, delete old Oracle components (e.g., old Instant Client directories) to free up disk space.
Update Documentation:
Document the new versions of lsnrctl, Oracle Database, and Instant Client, along with any configuration changes made during migration.
Monitor Performance:
Use Oracle Enterprise Manager (OEM) or lsnrctl commands (e.g., lsnrctl services) to monitor listener performance and ensure no issues arise after migration.

By following these steps, you can safely migrate lsnrctl (and its dependent Oracle components) on Ubuntu while minimizing downtime and ensuring data integrity. Always refer to Oracle’s official documentation for version-specific instructions.

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