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<p><a href="elma365-on-premises.html">BRIX On-Premises</a> &gt; <a href="infrastructure-preparation.html">Prepare infrastructure</a> &gt; Databases &gt; Prepare external databases / PostgreSQL</p>
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<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">PostgreSQL</span></h1>
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<p class="p_Normal">The article describes how to:</p>
<ul style="list-style-type:disc">
<li class="p_Normal">Install PostgreSQL for Ubuntu Linux 20.04.</li><li class="p_Normal"><a href="postgresql.html#prepare-to-restore" class="topiclink">Prepare a PostgreSQL database for restoration</a>.</li></ul>
<p class="p_Normal">You can also refer to the <a href="https://www.postgresql.org/download/linux/ubuntu/" target="_blank" class="weblink">official PostgreSQL documentation</a> for a brief guide. BRIX requires PostgreSQL version 11-15 for proper operation. &nbsp;</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">начало&nbsp;внимание&nbsp;</span></p>
<p class="p_Normal" style="line-height: 1.57;"><span style="font-size: 15px;">In this example, the database name is </span><span style="font-size: 15px; font-weight: bold;">elma365</span><span style="font-size: 15px;">, the user is </span><span style="font-size: 15px; font-weight: bold;">elma365</span><span style="font-size: 15px;">, and the password is </span><span style="font-size: 15px; font-weight: bold;">SecretPassword</span><span style="font-size: 15px;">. When configuring, set these data according to the security policy adopted in your organization.</span></p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">конец&nbsp;внимание</span></p>
<p class="p_Normal">Installation consists of six steps:</p>
<ol style="list-style-type:decimal">
<li value="1" class="p_Normal"><a href="postgresql.html#install-postgresql" class="topiclink">Install PostgreSQL</a>.</li><li value="2" class="p_Normal"><a href="postgresql.html#set-up-postgresql" class="topiclink">Configure PostgreSQL</a>.</li><li value="3" class="p_Normal"><a href="pdf-convert.html" class="topiclink">Configure connection to PostgreSQL</a>.</li><li value="4" class="p_Normal"><a href="postgresql.html#set-limits-to-postgresql" class="topiclink">Configure restrictions and limits for PostgreSQL</a>.</li><li value="5" class="p_Normal"><a href="postgresql.html#prepare-pgbouncer" class="topiclink">Prepare PGBouncer (optional)</a>.</li><li value="6" class="p_Normal"><a href="postgresql.html#connect-to-postgresql" class="topiclink">Connect to PostgreSQL</a>.</li></ol>
<h2 class="p_Heading2"><a id="install-postgresql" class="hmanchor"></a><span class="f_Heading2">Step 1: Install PostgreSQL</span></h2>
<p class="p_Normal">To install PostgreSQL, add the official repository:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo&nbsp;sh&nbsp;-c&nbsp;'echo&nbsp;&quot;deb&nbsp;http://apt.postgresql.org/pub/repos/apt&nbsp;$(lsb_release&nbsp;-cs)-pgdg&nbsp;main&quot;&nbsp;&gt;&nbsp;/etc/apt/sources.list.d/pgdg.list'</span><br />
<span class="f_CodeExample">wget&nbsp;--quiet&nbsp;-O&nbsp;-&nbsp;https://www.postgresql.org/media/keys/ACCC4CF8.asc&nbsp;|&nbsp;sudo&nbsp;apt-key&nbsp;add&nbsp;-</span><br />
<span class="f_CodeExample">sudo&nbsp;apt&nbsp;update</span></p>
<p class="p_Normal">Then install PostgreSQL:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo&nbsp;apt&nbsp;install&nbsp;postgresql-15</span></p>
<h2 class="p_Heading2"><a id="set-up-postgresql" class="hmanchor"></a><span class="f_Heading2">Step 2: Configure PostgreSQL</span></h2>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">Начало&nbsp;примечание</span></p>
<p class="p_Normal"><span style="font-weight: bold;">Note</span></p>
<p class="p_Normal">The password can contain the following characters:</p>
<ul style="list-style-type:disc">
<li class="p_Normal">Uppercase Latin letters: A to Z</li><li class="p_Normal">Lowercase Latin letters: a to z</li><li class="p_Normal">Digits: 0 to 9</li><li class="p_Normal">Symbols: -_</li></ul>
<p class="p_Normal">Reserved (invalid) characters: ! * ' ( ) ; : @ &amp; = + $ , / ? % # [ ]</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">Конец&nbsp;примечание</span></p>
<p class="p_Normal">To configure PostgreSQL, use the following commands:</p>
<ol style="list-style-type:upper-roman">
<li value="1" class="p_Normal">Create a separate <span style="font-weight: bold;">elma365</span> user with the <span style="font-weight: bold;">SecretPassword</span> password for working in the database. The username and password are given as an example:</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo&nbsp;-u&nbsp;postgres&nbsp;psql&nbsp;-c&nbsp;&quot;CREATE&nbsp;ROLE&nbsp;elma365&nbsp;WITH&nbsp;login&nbsp;password&nbsp;'SecretPassword';&quot;</span></p>
<ol style="list-style-type:upper-roman" start="2">
<li value="2" class="p_Normal"><a id="create-db" class="hmanchor"></a>Create a separate <span style="font-weight: bold;">elma365</span> database and assign the dedicated user <span style="font-weight: bold;">elma365</span> as its owner. Do not use an existing database, as the system creates tables and schemas:</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo&nbsp;-u&nbsp;postgres&nbsp;psql&nbsp;-c&nbsp;&quot;CREATE&nbsp;DATABASE&nbsp;elma365&nbsp;WITH&nbsp;OWNER&nbsp;elma365;&quot;</span></p>
<ol style="list-style-type:upper-roman" start="3">
<li value="3" class="p_Normal">Add the necessary extensions for the <span style="font-weight: bold;">elma365</span> database:</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo&nbsp;-u&nbsp;postgres&nbsp;psql&nbsp;-d&nbsp;elma365&nbsp;-c&nbsp;&quot;CREATE&nbsp;EXTENSION&nbsp;\&quot;uuid-ossp\&quot;;&nbsp;CREATE&nbsp;EXTENSION&nbsp;pg_trgm;&quot;</span></p>
<h2 class="p_Heading2"><a id="set-up-connection-to-postgresql" class="hmanchor"></a><span class="f_Heading2">Step 3: Configure connection to PostgreSQL</span></h2>
<ol style="list-style-type:upper-roman">
<li value="1" class="p_Normal">Add the IP address of the server where PostgreSQL is running to the configuration file <code><b>/etc/postgresql/15/main/postgresql.conf</b></code> in the parameter <code><b>listen_addresses</b></code>, for example, <code><b>192.168.10.10</b></code>:</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo&nbsp;nano&nbsp;/etc/postgresql/15/main/postgresql.conf</span><br />
<span class="f_CodeExample">listen_addresses&nbsp;=&nbsp;'localhost,&nbsp;192.168.10.10'</span></p>
<p class="p_Normal"><a class="dropdown-toggle" style="font-style: normal; font-weight: normal; color: #000000; background-color: transparent; text-decoration: none;" href="javascript:HMToggle('toggle','TOGGLE0186A1')">Configuration of TLS/SSL in PostgreSQL</a></p>
<div id="TOGGLE0186A1" class="dropdown-toggle-body" style="text-align: left; text-indent: 0; line-height: 1.80; padding: 0 0 0 0; margin: 0 0 0 0;"><table style="border:none; border-spacing:0;">
<tr>
<td style="vertical-align:top; padding:0; border:none"><p class="p_Normal">To enable TLS/SSL support in PostgreSQL in the configuration file <code><b>postgresql.conf</b></code>, you need to:</p>
<ol style="list-style-type:decimal">
<li value="1" class="p_Normal">Enable SSL support by setting the value <code><b>on</b></code> in the parameter <code><b>ssl</b></code>.</li></ol>
<ol style="list-style-type:decimal" start="2">
<li value="2" class="p_Normal">Specify the path to the root CA file in the parameter <code><b>ssl_ca_file</b></code>.</li></ol>
<ol style="list-style-type:decimal" start="3">
<li value="3" class="p_Normal">Specify the path to the server certificate file in the parameter <code><b>ssl_cert_file</b></code>.</li></ol>
<ol style="list-style-type:decimal" start="4">
<li value="4" class="p_Normal">Specify the path to the private key file in the parameter <code><b>ssl_key_file</b></code>.</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">ssl&nbsp;=&nbsp;on</span><br />
<span class="f_CodeExample">ssl_ca_file&nbsp;=&nbsp;'/etc/ssl/certs/CA.pem'</span><br />
<span class="f_CodeExample">ssl_cert_file&nbsp;=&nbsp;'/etc/ssl/certs/ssl-cert.pem'</span><br />
<span class="f_CodeExample">ssl_key_file&nbsp;=&nbsp;'/etc/ssl/private/server.key'</span></p>
<p class="p_Normal">For more details on TLS/SSL configuration in PostgreSQL, refer to the <a href="https://www.postgresql.org/docs/13/ssl-tcp.html" target="_blank" class="weblink">official PostgreSQL documentation</a>.</p>
</td>
</tr>
</table>
</div>
<ol style="list-style-type:upper-roman" start="2">
<li value="2" class="p_Normal">Add the network address of the elma365 nodes to the end of the authentication configuration file <code><b>/etc/postgresql/15/main/pg_hba.conf</b></code>:</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo&nbsp;nano&nbsp;/etc/postgresql/15/main/pg_hba.conf</span><br />
<span class="f_CodeExample">host&nbsp;&nbsp;&nbsp;&nbsp;all&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;all&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;192.168.0.0/16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;md5</span></p>
<ol style="list-style-type:upper-roman" start="3">
<li value="3" class="p_Normal">Reload the PostgreSQL service:</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo&nbsp;systemctl&nbsp;restart&nbsp;postgresql</span></p>
<h2 class="p_Heading2"><a id="set-limits-to-postgresql" class="hmanchor"></a><span class="f_Heading2">Step 4: Configure restrictions and limits for PostgreSQL</span></h2>
<ol style="list-style-type:upper-roman">
<li value="1" class="p_Normal"> Open the configuration file <code><b>/etc/postgresql/15/main/postgresql.conf</b></code> for editing:</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo&nbsp;nano&nbsp;/etc/postgresql/15/main/postgresql.conf</span></p>
<ol style="list-style-type:upper-roman" start="2">
<li value="2" class="p_Normal">Increase the maximum number of connections by changing the value of the parameter <code><b>max_connections</b></code> to <code><b>2000</b></code>:</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">max_connections&nbsp;=&nbsp;2000</span></p>
<ol style="list-style-type:upper-roman" start="3">
<li value="3" class="p_Normal">Increase the maximum number of locks per transaction by changing the value of the parameter <code><b>max_locks_per_transaction</b></code> to <code><b>512</b></code>. Also, uncomment this line (remove the # sign):</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">max_locks_per_transaction&nbsp;=&nbsp;512</span></p>
<ol style="list-style-type:upper-roman" start="4">
<li value="4" class="p_Normal">Reload the PostgreSQL service:</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo&nbsp;systemctl&nbsp;restart&nbsp;postgresql</span></p>
<ol style="list-style-type:upper-roman" start="5">
<li value="5" class="p_CodeExample" style="page-break-inside: avoid;">In&nbsp;some&nbsp;distribution&nbsp;packages&nbsp;of&nbsp;PostgreSQL,&nbsp;the&nbsp;<code><b>standard_conforming_strings</b></code>&nbsp;parameter&nbsp;that&nbsp;interprets&nbsp;backslash&nbsp;symbols&nbsp;is&nbsp;disabled.&nbsp;Check&nbsp;and&nbsp;enable&nbsp;the&nbsp;parameter:</li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">standard_conforming_strings&nbsp;=&nbsp;on</span></p>
<h2 class="p_Heading2"><a id="prepare-pgbouncer" class="hmanchor"></a><span class="f_Heading2">Step 5: Prepare PGBouncer (optional)</span></h2>
<p class="p_Normal">PGBouncer is designed to manage the connection pool to PostgreSQL and helps minimize the costs associated with establishing new connections to PostgreSQL. PGBouncer, refer to the <a href="pgbouncer-installation.html" class="topiclink">Install PGBouncer</a>.</p>
<h2 class="p_Heading2"><a id="connect-to-postgresql" class="hmanchor"></a><span class="f_Heading2">Step 6: Connect to PostgreSQL</span></h2>
<p class="p_Normal">PostgreSQL connection string:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">postgresql://elma365:SecretPassword@&lt;postgresql-server-address&gt;:5432/elma365?sslmode=disable</span></p>
<p class="p_Normal">PostgreSQL connection string with TLS/SSL:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">postgresql:</span><span class="f_CodeExample">//elma365:SecretPassword@&lt;postgresql-server-address&gt;:5432/elma365?sslmode=require</span></p>
<p class="p_Normal"><a class="dropdown-toggle" style="font-style: normal; font-weight: normal; color: #000000; background-color: transparent; text-decoration: none;" href="javascript:HMToggle('toggle','TOGGLE0186A2')">Connection to PostgreSQL via PGBouncer.</a></p>
<div id="TOGGLE0186A2" class="dropdown-toggle-body" style="text-align: left; text-indent: 0; line-height: 1.80; padding: 0 0 0 0; margin: 0 0 0 0;"><table style="border:none; border-spacing:0;">
<tr>
<td style="vertical-align:top; padding:0; border:none"><p class="p_Normal">Connection to PostgreSQL via PGBouncer:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">postgresql:</span><span class="f_CodeExample">//elma365:SecretPassword@&lt;postgresql-server-address&gt;:6432/elma365?sslmode=disable</span></p>
<p class="p_Normal">PGBouncer connection string with TLS/SSL:</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">postgresql:</span><span class="f_CodeExample">//elma365:SecretPassword@&lt;postgresql-server-address&gt;:6432/elma365?sslmode=require</span></p>
</td>
</tr>
</table>
</div>
<h2 class="p_Heading2"><a id="prepare-to-restore" class="hmanchor"></a><span class="f_Heading2">Prepare a PostgreSQL database for restoration</span></h2>
<p class="p_Normal">If you need to restore a database from backup, first prepare the database for restoration.</p>
<p class="p_Normal">For more details on backup, refer to the following articles:</p>
<ul style="list-style-type:disc">
<li class="p_Normal"><a href="dump_db.html" class="topiclink">External BRIX backup</a>.</li><li class="p_Normal"><a href="database-backup-and-recovery.html" class="topiclink">Backup and recover databases</a>.</li><li class="p_Normal"><a href="backup-restore-elma365standard.html" class="topiclink">Backup and restore databases for BRIX Standard</a>.</li></ul>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">Начало&nbsp;внимание</span></p>
<p class="p_Normal">Ensure you have a backup copy of the database you are deleting. Only after that, proceed with deleting the database.</p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">Конец&nbsp;внимание</span></p>
<ol style="list-style-type:upper-roman">
<li value="1" class="p_Normal">Delete the <span style="font-weight: bold;">elma365</span> database:</li></ol>
<p class="p_CodeExample" style="white-space: normal; page-break-inside: avoid;"><span class="f_CodeExample">sudo -u postgres psql -c &quot;DROP DATABASE elma365 WITH (FORCE);&quot;</span></p>
<ol style="list-style-type:upper-roman" start="2">
<li value="2" class="p_Normal">Create an empty <span style="font-weight: bold;">elma365</span> database to restore the database from backup. To do this, use the commands from <a href="postgresql.html#create-db" class="topiclink">Step 2: Configure PostgreSQL</a>.</li></ol>
<ol style="list-style-type:upper-roman" start="3">
<li value="3" class="p_Normal">After that, depending on your BRIX On-Premises edition and backup method, perform data restoration:</li></ol>
<ul style="list-style-type:disc">
<li class="p_Normal"><a href="database-backup-and-recovery.html#recovery-database" class="topiclink">Restore a backup copy using the utility</a>.</li><li class="p_Normal"><a href="backup-and-recovery-with-wal-g-and-rclone.html#walg-pgsql" class="topiclink">Restore a backup copy using WAL-G</a>.</li><li class="p_Normal"><a href="dump_db.html#restore" class="topiclink">Restore a backup copy when using external means</a>.</li><li class="p_Normal"><a href="backup-restore-elma365standard.html#restore" class="topiclink">Restore a backup copy in the Standard edition</a>.</li></ul>
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