Data synchronization using logstash: data synchronization from postgresql to elasticsearch

To sync data from PostgreSQL (PG) to Elasticsearch (ES) using Logstash, you can follow the steps below:

1. Install and configure Logstash:

   • Download and install Logstash. You can get the installation package for your operating system from the official Elasticsearch website.
   • Create a new Logstash configuration file, for example "pg_to_es.conf".
   • Open the configuration file and configure the following:

     input {
       jdbc {
         jdbc_connection_string => "jdbc:postgresql://<PG_HOST>:<PG_PORT>/<PG_DATABASE>"
         jdbc_user => "<PG_USERNAME>"
         jdbc_password => "<PG_PASSWORD>"
         jdbc_driver_library => "<PATH_TO_PG_JDBC_DRIVER_JAR>"
         jdbc_driver_class => "org.postgresql.Driver"
         statement => "SELECT * FROM <PG_TABLE>"
         schedule => "* * * * *"
       }
     }
     
     output {
       elasticsearch {
         hosts => ["<ES_HOST>:<ES_PORT>"]
         index => "<ES_INDEX>"
         document_id => "%{id}"
       }
     }
     

     Replace <PG_HOST>with your PostgreSQL hostname or IP address, <PG_PORT>with your PostgreSQL port number, <PG_DATABASE>with the name of the database you want to sync data with, <PG_USERNAME>and <PG_PASSWORD>with your PG credentials.
     will be <PATH_TO_PG_JDBC_DRIVER_JAR>replaced with the path to the PostgreSQL JDBC driver JAR file.
     will be <PG_TABLE>replaced with the table whose data is to be synchronized.
     Replace <ES_HOST>and <ES_PORT>with the Elasticsearch host and port number.
     Will be <ES_INDEX>replaced with the Elasticsearch index name to write the data to.
     scheduleoption sets the sync frequency, which is set to sync every minute in the above example. You can adjust it as needed.

2. Start Logstash:

   • Open a terminal or command prompt window.
   • Navigate to the Logstash installation directory.
   • Run the following commands to start Logstash and start data synchronization:

     bin/logstash -f pg_to_es.conf
     

Logstash will select data from the specified table in PostgreSQL and write it to the specified index in Elasticsearch. You can adjust the options in the configuration file as needed to meet your requirements.

Note that in order for this process to work, you will need to ensure you have proper access and network connectivity, and have the correct versions of the PostgreSQL JDBC driver and Logstash installed.