Change it from using the method "peer" to either scram-sha-256 or md5 (as determined above). Then open pg_hba.conf in a text editor, for example: sudo -i -u postgres vim /var/lib/pgsql/14/data/pg_hba.confįor our scenario, where we are going to configure RStudio to communicate with PostgreSQL on the same machine, the relevant line is the entry for "local all". To determine which encryption to use, issue the following command: sudo -i -u postgres psql -c 'show password_encryption' sudo -i -u postgres psql -c 'show hba_file' To locate pg_hba.conf, you can ask the database engine. psql: error: FATAL: Peer authentication failed for user "rstudio"Ĭonnectivity is configured via the pg_hba.conf file whose location is dependent on the PostgreSQL version, and locked down and only visible and editable for the user "postgres". If you receive an error such as below, then continue this section to fix it. If this works and you are placed at the PostgreSQL prompt, proceed to next section. "test", when prompted): psql -U rstudio -W rstudio To see if this is the case, attempt to connect (enter the password used above, e.g. PostgreSQL's default security settings may require adjustment before the account just created can be used to connect to PostgreSQL on localhost. sudo -i -u postgres psql -c "\l" Configure Connectivity To confirm successful creation of database "rstudio" owned by "rstudio", list the databases and look for the one just created. Sudo -i -u postgres psql -c " CREATE DATABASE rstudio WITH OWNER = rstudio " sudo -i -u postgres psql -c "CREATE ROLE rstudio CREATEDB LOGIN PASSWORD 'test' " Punctuation and capitalization are significant in both commands. Second command creates an empty database named "rstudio" owned by "rstudio". The first command below creates a new role named "rstudio", password "test", with ability to login and create databases. Using the default postgres role for RStudio's internal database is not recommended. \qĬreate Database Role (aka User) and Database ![]() To exit back to your shell, use Ctrl D, or "\q". From here you can execute SQL commands against the active database and see the results, or use internal commands (often starting with a backslash).įor example, to see a list of "roles" (database user accounts in Postgres terminology), use the "\du" command: \du Connect as follows from a terminal on the same machine where you installed PostgreSQL: sudo -i -u postgres psql ![]() Database Command Line BasicsĪfter installation using recommended commands from the download page, only the "postgres" user can connect to the database engine. Some details will vary on other database versions and Linux distributions. Note: Steps in this article were tested using PostgreSQL version 14, the most recent at time of writing, on Red Hat/Rocky Linux 8. Select your platform, OS version, and desired PostgreSQL version, and matching installation commands will be provided. Install PostgreSQLĪlthough many Linux distributions include a version of PostgreSQL in their package libraries, for this article we will use the instructions on the PostgreSQL website to download the most recent version. If the psql command isn't found, then you'll need to install PostgreSQL. ![]() RStudio requires version 9.5 or above, so if an older version is found you'll need to upgrade it or install multiple versions (both beyond the scope of this article). Check for PostgreSQLįrom a terminal, check if PostgreSQL is already installed and display the version. Note: RStudio can use the PostgreSQL option without load-balancing enabled, which is helpful for configuration experimentation as described in this article. When using RStudio's internal load balancer, however, a PostgreSQL database must be created and configured manually by the administrator as mentioned in the Database section of the Admin Guide. By default, RStudio uses SQLite, installing the necessary dependencies and automatically creating the database. RStudio Workbench 1.4 (and above) uses a database for internal purposes. This article provides a primer for getting started but is not intended to be a comprehensive explanation of best practices for configuring and operating Postgres in a production environment. Note: The official name is "PostgreSQL" but often shortened to "Postgres". ![]() System Administrators who are unfamiliar with basic installation and configuration of the PostgreSQL database engine for RStudio Workbench (previously RStudio Server Pro).
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