{"id":8114,"date":"2025-04-30T11:53:20","date_gmt":"2025-04-30T11:53:20","guid":{"rendered":"https:\/\/test.opensource-db.in\/wp1\/?p=8114"},"modified":"2025-04-30T11:53:23","modified_gmt":"2025-04-30T11:53:23","slug":"understanding-postgresql-parameters-for-connections-and-authentication","status":"publish","type":"post","link":"https:\/\/test.opensource-db.in\/wp1\/understanding-postgresql-parameters-for-connections-and-authentication\/","title":{"rendered":"Understanding PostgreSQL parameters for connections and authentication"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Understanding the parameters involved in PostgreSQL&#8217;s connection string and authentication process is essential for managing database access and server communication. These settings play a critical role in establishing secure connections, verifying user credentials, granting access to the server, monitoring query activity, and configuring key server properties such as listen_addresses, port, and max_connections.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"> Two important parameters related to authentication are:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">authentication_timeout: This parameter defines the maximum time the server waits for a client to authenticate. If the client fails to complete authentication within this time frame, postgres terminates the connection attempt.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">password_encryption: This setting determines how passwords are stored and transmitted. Common values include md5, scram-sha-256, and on (which enables encryption using the default method). Secure password encryption is crucial to protect user credentials and prevent unauthorized access.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">listen_addresses:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The listen_addresses configuration parameter determines which TCP\/IP addresses the server listens on for incoming connections. Introduced in PostgreSQL 8.0, it accepts a comma-separated list of IP addresses or hostnames, including special values like 0.0.0.0,::, and *. <\/p>\n\n\n\n<h4 class=\"wp-block-heading\">What Does listen_addresses Do?<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Accepts a comma-separated list of IP addresses or hostnames.<\/li>\n\n\n\n<li>Supports special values:<\/li>\n\n\n\n<li>* \u2014 listen on all IP addresses (IPv4 and IPv6).<\/li>\n\n\n\n<li>0.0.0.0 \u2014 all IPv4 addresses.<\/li>\n\n\n\n<li>:: \u2014 all IPv6 addresses.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If left blank, the server only listens via Unix domain sockets (no TCP access).Requires a server restart to take effect.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to check the current value:<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# show listen_addresses ;\n listen_addresses \n------------------\n localhost\n(1 row)<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">How to Set listen_addresses<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">You can modify the parameter using the ALTER SYSTEM command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# alter system set listen_addresses to '*';\nALTER SYSTEM<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">To apply the changes to PostgreSQL server, restart it.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Verifying the Change<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">After restart, re-check the parameter:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# show listen_addresses ;\n listen_addresses \n------------------\n *\n(1 row)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This information can also be queried with the pg_settings system catalog for detailed metadata:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# select * from  pg_settings where name ='listen_addresses';\n-&#091; RECORD 1 ]---+-----------------------------------------------------\nname            | listen_addresses\nsetting         | *\nunit            | \ncategory        | Connections and Authentication \/ Connection Settings\nshort_desc      | Sets the host name or IP address(es) to listen to.\nextra_desc      | \ncontext         | postmaster\nvartype         | string\nsource          | configuration file\nmin_val         | \nmax_val         | \nenumvals        | \nboot_val        | localhost\nreset_val       | *\nsourcefile      | \/var\/lib\/pgsql\/16\/data\/postgresql.auto.conf\nsourceline      | 20\npending_restart | f<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Key fields from pg_settings:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>name: The parameter name (listen_addresses)<\/li>\n\n\n\n<li>setting: The current value<\/li>\n\n\n\n<li>category: Connections and Authentication \/ Connection Settings<\/li>\n\n\n\n<li>context: postmaster means this setting requires a full restart<\/li>\n\n\n\n<li>pending_restart: f (false) means the current value is active<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Important:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Setting listen_addresses = &#8216;*<em>&#8216; allows PostgreSQL to accept connections from any network interface. This is useful for remote access but requires proper firewall rules and pg_hba.conf configuration to secure the server. Only use &#8216;<\/em>&#8220;*&#8221; in trusted environments or with strong access controls.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Port :<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>port <\/strong>parameter in PostgreSQL defines the TCP\/IP port on which the server listens for incoming connections, with a default value of 5432. Introduced in PostgreSQL 7.1, this setting is critical for client-server communication and must be an integer between 1 and 65535. Since PostgreSQL can only listen on one port at a time, multiple port configurations require external tools like reverse proxies. The specified port also influences the Unix socket name, and any changes to this parameter require a server restart. For most setups, sticking with the default port ensures compatibility and ease of access.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How to check the current value:<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# show port ;\n port \n------\n 5432\n(1 row)<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">How to Set Port<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">You can modify the parameter using the ALTER SYSTEM command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# alter system set port to '5433';\nALTER SYSTEM<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">To apply the changes to the PostgreSQL server, restart it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Verifying the Change<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">After the restart, re-check the parameter:<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# alter system set port to '5433';\nALTER SYSTEM<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This information can also be queried with the pg_settings system catalog for detailed metadata:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# select * from  pg_settings where name ='port';\n-&#091; RECORD 1 ]---+-----------------------------------------------------\nname            | port\nsetting         | 5433\nunit            | \ncategory        | Connections and Authentication \/ Connection Settings\nshort_desc      | Sets the TCP port the server listens on.\nextra_desc      | \ncontext         | postmaster\nvartype         | integer\nsource          | configuration file\nmin_val         | 1\nmax_val         | 65535\nenumvals        | \nboot_val        | 5432\nreset_val       | 5433\nsourcefile      | \/var\/lib\/pgsql\/16\/data\/postgresql.auto.conf\nsourceline      | 21\npending_restart | f<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Key fields from pg_settings:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>name: The parameter name (port)<\/li>\n\n\n\n<li>setting: The current value (5433)<\/li>\n\n\n\n<li>category: Connections and Authentication \/ Connection Settings<\/li>\n\n\n\n<li>context: postmaster requires a full restart<\/li>\n\n\n\n<li>pending_restart: f (false) current value is active<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Important:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Changing the port from the default 5432 to 5433 (or any other value) can avoid conflicts with other PostgreSQL instances, but all client connection settings (like connection strings and firewall rules) must be updated accordingly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">max_connections in PostgreSQL:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>max_connections<\/code> parameter controls the maximum number of simultaneous client connections allowed to a PostgreSQL database server. <span style=\"margin: 0px;padding: 0px\">This is set to&nbsp;<strong>100 by default<\/strong><\/span>, although the actual default can be lower depending on the operating system&#8217;s kernel settings at the time of database initialization. This setting is vital for managing server load and ensuring optimal performance, especially in environments with multiple users or applications accessing the database concurrently. Any changes to this parameter require a <strong>server restart<\/strong> to take effect.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How to check the current value:<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# show max_connections ;\n max_connections \n-----------------\n 100\n(1 row)<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Set max_connections to 200:<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# alter system set max_connections to '200';\nALTER SYSTEM<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">To apply the changes to the PostgreSQL server, restart it.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Verifying the Change<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">After the restart, re-check the parameter:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# show max_connections ;\n max_connections \n-----------------\n 200\n(1 row)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This information can also be queried with the pg_settings system catalog for detailed metadata:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# select * from  pg_settings where name ='max_connections';\n-&#091; RECORD 1 ]---+-----------------------------------------------------\nname            | max_connections\nsetting         | 200\nunit            | \ncategory        | Connections and Authentication \/ Connection Settings\nshort_desc      | Sets the maximum number of concurrent connections.\nextra_desc      | \ncontext         | postmaster\nvartype         | integer\nsource          | configuration file\nmin_val         | 1\nmax_val         | 262143\nenumvals        | \nboot_val        | 100\nreset_val       | 200\nsourcefile      | \/var\/lib\/pgsql\/16\/data\/postgresql.auto.conf\nsourceline      | 22\npending_restart | f<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Key fields from pg_settings:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>name: The parameter name (max_connections)<\/li>\n\n\n\n<li>setting: The current value (200)<\/li>\n\n\n\n<li>category: Connections and Authentication \/ Connection Settings<\/li>\n\n\n\n<li>context: Postmaster requires a full restart<\/li>\n\n\n\n<li>pending_restart: f (false), current value is active<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Important:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Increasing max_connections may require tuning shared memory parameters (like shared_buffers and max_locks_per_transaction) to prevent performance degradation or startup failure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><code>authentication_timeout<\/code>:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>authentication_timeout<\/code> parameter defines the maximum amount of time a client is allowed to complete the authentication process when connecting to the PostgreSQL server. Introduced with a default value of <strong>60 seconds (1 minute)<\/strong> starting from <strong>PostgreSQL 8.4<\/strong>, earlier versions did not specify a default. The maximum allowable setting for this parameter is <strong>600 seconds (10 minutes)<\/strong>. It can be configured either in the <code>postgresql.conf<\/code> file or supplied as a command-line argument when starting the server. Categorized under <strong>Authentication settings<\/strong> in recent PostgreSQL versions, <code>authentication_timeout<\/code> plays a crucial role in preventing hung authentication sessions and protecting server resources.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How to check the current value:<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# show authentication_timeout ;\n authentication_timeout \n------------------------\n 1min\n(1 row)<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">How to Set authentication_timeout<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">You can modify the parameter using the ALTER SYSTEM command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# alter system set authentication_timeout to '2min';\nALTER SYSTEM<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">To apply the changes to the PostgreSQL server, reload it.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Verifying the Change<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">After reload, re-check the parameter:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# show authentication_timeout ;\n authentication_timeout \n------------------------\n 2min\n(1 row)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This information can also be queried with the pg_settings system catalog for detailed metadata:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\npostgres=# select * from  pg_settings where name ='authentication_timeout';\n-&#091; RECORD 1 ]---+-----------------------------------------------------------------\nname            | authentication_timeout\nsetting         | 120\nunit            | s\ncategory        | Connections and Authentication \/ Authentication\nshort_desc      | Sets the maximum allowed time to complete client authentication.\nextra_desc      | \ncontext         | sighup\nvartype         | integer\nsource          | configuration file\nmin_val         | 1\nmax_val         | 600\nenumvals        | \nboot_val        | 60\nreset_val       | 120\nsourcefile      | \/var\/lib\/pgsql\/16\/data\/postgresql.auto.conf\nsourceline      | 23\npending_restart | f<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Key fields from pg_settings:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>name: The parameter name (authentication_timeout)<\/li>\n\n\n\n<li>setting: The current value (120 seconds)<\/li>\n\n\n\n<li>category: Connections and Authentication \/ Authentication<\/li>\n\n\n\n<li>context: sighup requires a reload, not a restart<\/li>\n\n\n\n<li>pending_restart: f (false) current value is active<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Important:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">A higher value may improve login success in slow or high-latency networks, but can expose the server to longer DoS windows if unauthenticated connections are abused.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">password_encryption:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>password_encryption<\/code> parameter determines how PostgreSQL encrypts passwords when they are stored or transmitted during authentication. It is one of the most important security-related settings, as it directly impacts how user credentials are protected. This parameter is essential for verifying user identities during login and ensuring secure access to the database. Introduced in <strong>PostgreSQL 7.2<\/strong>, it has evolved significantly across versions. In PostgreSQL versions <strong>7.2 through 9.6<\/strong>, the default value was <code>'on'<\/code>, which enabled password encryption without specifying the method. Starting with <strong>PostgreSQL 10<\/strong>, the default was updated to <strong><code>md5<\/code><\/strong>, and from <strong>PostgreSQL 14<\/strong> onward, it changed to the more secure <strong><code>scram-sha-256<\/code><\/strong> algorithm.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How to check the current value:<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# show password_encryption ;\n password_encryption \n---------------------\n scram-sha-256\n(1 row)\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">How to Set password_encryption<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">You can modify the parameter using the ALTER SYSTEM command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# alter system set password_encryption to 'md5';\nALTER SYSTEM<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">To apply the changes to PostgreSQL server, reload it.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Verifying the Change<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">After reload, re-check the parameter:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# show password_encryption ;\n password_encryption \n---------------------\n md5\n(1 row)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This information can also be queried with the pg_settings system catalog for detailed metadata:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>postgres=# select * from  pg_settings where name ='password_encryption';\n-&#091; RECORD 1 ]---+------------------------------------------------\nname            | password_encryption\nsetting         | md5\nunit            | \ncategory        | Connections and Authentication \/ Authentication\nshort_desc      | Chooses the algorithm for encrypting passwords.\nextra_desc      | \ncontext         | user\nvartype         | enum\nsource          | configuration file\nmin_val         | \nmax_val         | \nenumvals        | {md5,scram-sha-256}\nboot_val        | scram-sha-256\nreset_val       | md5\nsourcefile      | \/var\/lib\/pgsql\/16\/data\/postgresql.auto.conf\nsourceline      | 24\npending_restart | f<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Key fields from pg_settings:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>name: The parameter name (password_encryption)<\/li>\n\n\n\n<li>Setting: The current value (md5)<\/li>\n\n\n\n<li>category: Connections and Authentication \/ Authentication<\/li>\n\n\n\n<li>context: user no restart required<\/li>\n\n\n\n<li>pending_restart: f (false), current value is active<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Important:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">md5 is less secure than scram-sha-256. Use scram-sha-256 in environments where stronger password security is required.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion:<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">These configuration parameters those tied to connection handling and authentication, are vital for database administrators aiming to build secure, scalable, and stable environments. Parameters like listen_addresses, port, max_connections, authentication_timeout, and password_encryption are fundamental in controlling how the server interacts with clients, handles credentials, and maintains performance. These settings are configured to ensure that PostgreSQL remains resilient, secure, and efficient across a wide range of deployment scenarios.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Understanding the parameters involved in PostgreSQL&#8217;s connection string and authentication process is essential for managing database access and server communication. 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