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I am encountering an issue while attempting to connect to a PostgreSQL Pgpool server using Entity Framework Core. The setup involves the utilization of the Postgresql HA Helm Chart by Bitnami, which sets up a high-availability PostgreSQL cluster. The intended behavior is for EF Core to create the database if it doesn't already exist and subsequently migrate data. However, upon initiating the connection and migration process, I am immediately confronted with the following error:

Npgsql.PostgresException (0x80004005): XX000: unable to get session context.

My architecture comprises a PostgreSQL Pgpool server orchestrated via the Bitnami Postgresql HA Helm Chart. The primary goal is to establish a connection using Entity Framework Core and perform migrations to set up the initial data structure. Regrettably, the encountered error is impeding progress.

Ideally, when EF Core connects to the PostgreSQL Pgpool server, it should be able to acquire the necessary session context to proceed with database operations, including database creation and data migration.

Steps Taken:

Configured the PostgreSQL Pgpool server using the Bitnami Postgresql HA Helm Chart. Attempted to connect to the database and initiate data migration using Entity Framework Core. Encountered the Npgsql.PostgresException with the error message indicating a failure to obtain the session context (XX000: unable to get session context).

This is how I am trying to initialize the DbContext in my Startup :

        services.AddDbContext<MyDbContext>(options =>
        {
            options.UseNpgsql(configuration.GetConnectionString("PostgresConnection"))
                .UseSnakeCaseNamingConvention();
        });

Additional Information:

EF Core Version: 6.0

Erdison Berisha
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  • The error comes from Npgsql, not EF Core. EF Core isn't a database driver or data access library. The data access library is ADO.NET and the driver is Npgsql. The question doesn't contain any details about Npgsql, the connection string, versions etc, so people can't really help. – Panagiotis Kanavos Aug 24 '23 at 09:28
  • To troubleshoot this, create a new console application and use *only* Npgsql to create a connection and run the command. At the very least, post the test code and the full exception text returned by `Exception.ToString()`. – Panagiotis Kanavos Aug 24 '23 at 09:30

3 Answers3

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Go to pgpool.conf file and change the pool-mode settign to session;

pool_mode = session

then restart the Pgpool after saving the changes, using this command.

sudo systemctl restart pgpool2

Doing this will resolve your "unable to get session context" error when connecting to PostgreSQL through Pgpool.

Maimoona Abid
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I had same issue using docker-compose. My issue turned out to be caused by a missing database. Looking at the logs of the pgpool instance offered some clues.

MTN Service Account
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The error message "unable to get session context" has happened to me because the connection string in the configuration.GetConnectionString("PostgresConnection") method was not correctly configured.

motoaima
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