Checking Whether the Source Database Is Connected

Whether the source database is connected

Check the connectivity and accuracy of the IP address, port number, username, and password of the source database.

Failure cause: The connection fails.

Handling suggestion: See network preparations in the Data Replication Service Best Practices.

Failure cause: Incorrect username or password

Handling suggestion: Check whether the input username and password for the connection test are correct.

Failure cause: The database account does not allow remote connections.

Handling suggestion:

Run the following command to create a user that allows remote connections. After the migration, delete this user.

CREATE USER 'Account' @ '%' IDENTIFIED BY 'Password'

Failure cause: The SSL CA root certificate is invalid.

Handling suggestion: Upload a valid SSL CA certificate.

Failure cause: No SSL CA root certificate exists.

Handling suggestion: Contact Huawei technical support.

Failure cause: The database is unavailable.

Handling suggestion: Contact Huawei technical support.

Whether the source database is connected

Check the connectivity and accuracy of the IP address, port number, username, and password of the source database.

Failure cause: The IP address is inaccessible.

Handling suggestion: See network preparations in the Data Replication Service Best Practices.

Failure cause: The connection fails.

Handling suggestion: See network preparations in the Data Replication Service Best Practices.

Failure cause: The database account does not allow remote connections.

Handling suggestion:

Configure the remote connection permission for the user in the pg_hba.conf file.

Open pg_hba.conf, add the following, and restart the database for the modification to take effect:

host all xxx(dbuser) 0.0.0.0/0 password

After the migration is complete, delete this record and restart the database again.

Failure cause: Failed to connect to the database.

Handling suggestion:

The listen_addresses parameter value or port number in the postgres.conf file is incorrect.

In the postgres.conf file, set the listen_addresses value to '*' or set the port number to the correct value. Then, restart the database for the modification to take effect.

Failure cause: Incorrect username or password

Handling suggestion: Check whether the input username and password for the connection test are correct.

Failure cause: The user does not have the login permission.

Handling suggestion:

Run the following command to grant the login permission to the user:

alter role xxx(dbuser) login

Failure cause: The postgres database does not exist in the source database.

Handling suggestion: Create a postgres database.

Whether the source database is connected

Check the connectivity and accuracy of the IP address, port number, username, and password of the source database.

Failure cause: The connection fails.

Handling suggestion: See network preparations in the Data Replication Service Best Practices.

Failure cause: The username, password, or authentication database of the source database is incorrect.

Handling suggestion: Check that the input username, password, and authentication database for the connection test are correct.

Failure cause: The database is unavailable.

Handling suggestion: Contact Huawei technical support.

Failure cause: An internal error occurs.

Handling suggestion: Contact Huawei technical support.

Failure cause: SSL connection parameters are not configured.

Handling suggestion: Contact Huawei technical support.

Failure cause: The source database cannot connect to the port of the replication instance.

Handling suggestion: Modify the firewall, security group, or ACL configurations of the source and destination databases to enable the source database to connect to the port of the replication instance.