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<p><a href="elma365-on-premises.html">BRIX On-Premises</a> > <a href="infrastructure-preparation.html">Prepare infrastructure</a> > Load balancer / Configure HAProxy for PostgreSQL</p>
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<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">Configure HAProxy for PostgreSQL</span></h1>
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<p class="p_Normal">The architecture of the highly available BRIX cluster involves the interaction of BRIX application microservices with a PostgreSQL database cluster. To ensure secure load balancing in the system, create a HAProxy configuration for PostgreSQL. This way, in case of a failure, all traffic will be redirected to the Master-Replica(s) cluster, which guarantees continuous operation of the system.</p>
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<p class="p_Normal">Examples of a HAProxy сonfiguration:</p>
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<ol style="list-style-type:decimal">
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<li value="1" class="p_Normal"><a href="haproxy-postgresql.html#haproxypostgresql" class="topiclink">Example HAProxy configuration for connecting to PostgreSQL</a>.</li><li value="2" class="p_Normal"><a href="haproxy-postgresql.html#haproxypgbouncer" class="topiclink">Example HAProxy configuration for connecting to PGBouncer</a>.</li></ol>
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<h2 class="p_Heading2"><a id="haproxypostgresql" class="hmanchor"></a><span class="f_Heading2">Example of a HAProxy configuration for connecting to PostgreSQL</span></h2>
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<p class="p_Normal">This configuration is prepared for load balancing traffic in a PostgreSQL cluster deployed according to the description in <a href="configure-postgresql.html" class="topiclink">PostgreSQL cluster</a>. HAProxy is used for balancing. It automatically checks port <code><b>8008</b></code> of Patroni service on PostgreSQL servers with the <code><b>master</b></code> role.</p>
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<p class="p_Normal">The operation traffic to the cluster is distributed as follows:</p>
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<ul style="list-style-type:disc">
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<li class="p_Normal">Write operations coming to <code><b>haproxy-server.your_domain:5000</b></code> are directed to the server with the <code><b>master</b></code> role.</li><li class="p_Normal">Read operations coming to <code><b>haproxy-server.your_domain:5001</b></code> are directed to servers with the <code><b>slave</b></code> role.</li></ul>
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<p class="p_Normal">In case of a failure, all traffic will be redirected to the Master-Replica(s) cluster, i.e. write and read operations will start to arrive here.</p>
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<p class="p_Normal">In order to create a HAProxy configuration for PostgreSQL, follow these steps:</p>
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<ol style="list-style-type:upper-roman">
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<li value="1" class="p_Normal">Open the <code><b>haproxy.cfg</b></code> configuration file for editing using the following command:</li></ol>
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<p class="p_CodeExample" style="page-break-inside: avoid; margin: 0 0 0 34px;"><span class="f_CodeExample">sudo nano /etc/haproxy/haproxy.cfg</span></p>
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<ol style="list-style-type:upper-roman" start="2">
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<li value="2" class="p_Normal">Edit the <code><b>haproxy.cfg</b></code> configuration file:</li></ol>
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<p class="p_Normal" style="margin: 0 0 0 34px;"><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 example:</a></p>
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<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 34px;"><table style="border:none; border-spacing:0;">
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<tr>
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<td style="vertical-align:top; padding:0; border:none"><p class="p_CodeExample" style="line-height: 1.80; white-space: normal; page-break-inside: auto; margin: 0 0 0 34px;"><span class="f_CodeExample">### PostgreSQL ###</span><br />
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<span class="f_CodeExample">listen postgres_master</span><br />
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<span class="f_CodeExample"> bind haproxy-server.your_domain:5000</span><br />
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<span class="f_CodeExample"> option tcplog</span><br />
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<span class="f_CodeExample"> option httpchk OPTIONS /master</span><br />
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<span class="f_CodeExample"> http-check expect status 200</span><br />
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<span class="f_CodeExample"> default-server inter 3s fastinter 1s fall 3 rise 4 on-marked-down shutdown-sessions</span><br />
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<span class="f_CodeExample"> server postgres-server1 postgres-server1.your_domain:5432 check port 8008</span><br />
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<span class="f_CodeExample"> server postgres-server2 postgres-server2.your_domain:5432 check port 8008</span><br />
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<span class="f_CodeExample"> server postgres-server3 postgres-server3.your_domain:5432 check port 8008</span><br />
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<span class="f_CodeExample"> </span><br />
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<span class="f_CodeExample">listen postgres_replicas</span><br />
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<span class="f_CodeExample"> bind haproxy-server.your_domain:5001</span><br />
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<span class="f_CodeExample"> option tcplog</span><br />
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<span class="f_CodeExample"> option httpchk OPTIONS /replica</span><br />
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<span class="f_CodeExample"> balance roundrobin</span><br />
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<span class="f_CodeExample"> http-check expect status 200</span><br />
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<span class="f_CodeExample"> default-server inter 3s fastinter 1s fall 3 rise 2 on-marked-down shutdown-sessions</span><br />
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<span class="f_CodeExample"> server postgres-server1 postgres-server1.your_domain:5432 check port 8008</span><br />
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<span class="f_CodeExample"> server postgres-server2 postgres-server2.your_domain:5432 check port 8008</span><br />
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<span class="f_CodeExample"> server postgres-server3 postgres-server3.your_domain:5432 check port 8008</span><br />
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<span class="f_CodeExample">### PostgreSQL ###</span></p>
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</td>
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</tr>
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</table>
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</div>
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<p class="p_Normal" style="margin: 0 0 0 34px;"><a class="dropdown-toggle" style="font-style: normal; font-weight: normal; color: #000000; background-color: transparent; text-decoration: none;" href="javascript:HMToggle('toggle','TOGGLE0186A2')">Example of a HAProxy configuration using SSL</a></p>
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<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 34px;"><table style="border:none; border-spacing:0;">
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<tr>
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<td style="vertical-align:top; padding:0; border:none"><p class="p_Normal" style="line-height: 1.28; margin: 0 0 11px 0;"><span style="font-family: Inter;">Enabling SSL is possible if OpenSSL support is built in. In the </span><code><b>crt</b></code><span style="font-family: Inter;"> parameter, specify the path to the PEM file containing the required certificates and associated private keys (<a href="fullchain-sertificate.html" class="topiclink">fullchain certificate</a>). If the file does not contain a private key, HAProxy will attempt to load the key from the same path with a </span><span style="font-family: Inter; font-weight: bold;">.key</span><span style="font-family: Inter;"> suffix.</span></p>
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<p class="p_Normal"> <br />
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If a directory name is used instead of a PEM file, all files found in that directory will be loaded in alphabetical order, excluding files ending in <span style="font-weight: bold;">.issuer</span>, <span style="font-weight: bold;">.ocsp</span>, and <span style="font-weight: bold;">.sctl</span> (reserved solutions).</p>
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<p class="p_Normal"> <br />
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<span style="font-family: Inter;">In the </span><code><b>ca-file</b></code><span style="font-family: Inter;"> parameter, specify the path to the PEM file containing the root certificate. For more details, refer to the </span><span style="font-family: Inter; font-weight: bold;">Configuration Manual</span><span style="font-family: Inter;"> for the used version of HAProxy. For example, for</span><span style="font-size: 13px; font-family: Inter; color: #394149;"> <a href="https://cbonte.github.io/haproxy-dconv/2.5/configuration.html#5.1-crt" target="_blank" class="weblink">HAProxy 2.5</a>:</span></p>
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<p class="p_CodeExample" style="line-height: 1.80; white-space: normal; page-break-inside: auto; margin: 0 0 0 34px;"><span class="f_CodeExample">### PostgreSQL ###</span><br />
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<span class="f_CodeExample">listen postgres_master</span><br />
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<span class="f_CodeExample"> bind haproxy-server.your_domain:5000 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem</span><br />
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<span class="f_CodeExample"> option tcplog</span><br />
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<span class="f_CodeExample"> option httpchk OPTIONS /master</span><br />
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<span class="f_CodeExample"> http-check expect status 200</span><br />
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<span class="f_CodeExample"> </span><span class="f_CodeExample" style="font-weight: bold;">default</span><span class="f_CodeExample">-server inter 3s fastinter 1s fall 3 rise 4 on-marked-down shutdown-sessions</span><br />
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<span class="f_CodeExample"> server postgres-server1 postgres-server1.your_domain:5432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
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<span class="f_CodeExample"> server postgres-server2 postgres-server2.your_domain:5432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
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<span class="f_CodeExample"> server postgres-server3 postgres-server3.your_domain:5432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
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<span class="f_CodeExample"> </span><br />
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<span class="f_CodeExample">listen postgres_replicas</span><br />
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<span class="f_CodeExample"> bind haproxy-server.your_domain:5001 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem</span><br />
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<span class="f_CodeExample"> option tcplog</span><br />
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<span class="f_CodeExample"> option httpchk OPTIONS /replica</span><br />
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<span class="f_CodeExample"> balance roundrobin</span><br />
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<span class="f_CodeExample"> http-check expect status 200</span><br />
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<span class="f_CodeExample"> </span><span class="f_CodeExample">default</span><span class="f_CodeExample">-server inter 3s fastinter 1s fall 3 rise 2 on-marked-down shutdown-sessions</span><br />
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<span class="f_CodeExample"> server postgres-server1 postgres-server1.your_domain:5432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
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<span class="f_CodeExample"> server postgres-server2 postgres-server2.your_domain:5432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
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<span class="f_CodeExample"> server postgres-server3 postgres-server3.your_domain:5432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
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<span class="f_CodeExample">### PostgreSQL ###</span></p>
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</td>
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</tr>
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</table>
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</div>
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<ol style="list-style-type:upper-roman" start="3">
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<li value="3" class="p_Normal">Restart HAProxy to apply changes:</li></ol>
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<p class="p_CodeExample" style="page-break-inside: avoid; margin: 0 0 0 34px;"><span class="f_CodeExample">sudo systemctl restart haproxy</span></p>
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<h2 class="p_Heading2"><a id="haproxypgbouncer" class="hmanchor"></a><span class="f_Heading2">Example of a HAProxy configuration for connecting to PGBouncer</span></h2>
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<p class="p_Normal">This configuration is prepared for load balancing traffic in a PostgreSQL cluster, deployed according to the description in the <a href="configure-postgresql.html" class="topiclink">PostgreSQL cluster</a> article, through the <a href="pgbouncer-installation.html" class="topiclink">PGBouncer</a> program. HAProxy is used for balancing. It automatically checks port <code><b>8008</b></code> of Patroni service on PostgreSQL servers with the <code><b>master</b></code> role.</p>
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<p class="p_Normal">The operation traffic to the cluster is distributed as follows:</p>
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<ul style="list-style-type:disc">
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<li class="p_Normal">Write operations coming to <code><b>haproxy-server.your_domain:5000</b></code> are directed to the server with the <code><b>master</b></code> role.</li><li class="p_Normal">Read operations coming to <code><b>haproxy-server.your_domain:5001</b></code> are directed to servers with the <code><b>slave</b></code> role.</li></ul>
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<p class="p_Normal">In case of a failure, all traffic will be redirected to the Master-Replica(s) cluster, i.e. write and read operations will start to arrive here.</p>
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<p class="p_Normal">In order to create a HAProxy configuration through the PGBouncer program, perform the following actions:</p>
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<ol style="list-style-type:upper-roman">
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<li value="1" class="p_Normal">Open the configuration file <code><b>haproxy.cfg</b></code> for editing using the following command:</li></ol>
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<p class="p_CodeExample" style="page-break-inside: avoid; margin: 0 0 0 34px;"><span class="f_CodeExample">sudo nano /etc/haproxy/haproxy.cfg</span></p>
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<ol style="list-style-type:upper-roman" start="2">
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<li value="2" class="p_Normal">Edit the <code><b>haproxy.cfg</b></code> configuration file:</li></ol>
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<p class="p_Normal" style="margin: 0 0 0 34px;"><a class="dropdown-toggle" style="font-style: normal; font-weight: normal; color: #000000; background-color: transparent; text-decoration: none;" href="javascript:HMToggle('toggle','TOGGLE0186A3')">Configuration example</a></p>
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<div id="TOGGLE0186A3" class="dropdown-toggle-body" style="text-align: left; text-indent: 0; line-height: 1.80; padding: 0 0 0 0; margin: 0 0 0 34px;"><table style="border:none; border-spacing:0;">
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<tr>
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<td style="vertical-align:top; padding:0; border:none"><p class="p_CodeExample" style="line-height: 1.80; white-space: normal; page-break-inside: auto; margin: 0 0 0 34px;"><span class="f_CodeExample">### PostgreSQL ###</span><br />
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<span class="f_CodeExample">listen postgres_master</span><br />
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<span class="f_CodeExample"> bind haproxy-server.your_domain:5000</span><br />
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<span class="f_CodeExample"> option tcplog</span><br />
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<span class="f_CodeExample"> option httpchk OPTIONS /master</span><br />
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<span class="f_CodeExample"> http-check expect status 200</span><br />
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<span class="f_CodeExample"> </span><span class="f_CodeExample" style="font-weight: bold;">default</span><span class="f_CodeExample">-server inter 3s fastinter 1s fall 3 rise 4 on-marked-down shutdown-sessions</span><br />
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<span class="f_CodeExample"> server postgres-server1 postgres-server1.your_domain:6432 check port 8008</span><br />
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<span class="f_CodeExample"> server postgres-server2 postgres-server2.your_domain:6432 check port 8008</span><br />
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<span class="f_CodeExample"> server postgres-server3 postgres-server3.your_domain:6432 check port 8008</span><br />
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<span class="f_CodeExample"> </span><br />
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<span class="f_CodeExample">listen postgres_replicas</span><br />
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<span class="f_CodeExample"> bind haproxy-server.your_domain:5001</span><br />
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<span class="f_CodeExample"> option tcplog</span><br />
|
||
<span class="f_CodeExample"> option httpchk OPTIONS /replica</span><br />
|
||
<span class="f_CodeExample"> balance roundrobin</span><br />
|
||
<span class="f_CodeExample"> http-check expect status 200</span><br />
|
||
<span class="f_CodeExample"> </span><span class="f_CodeExample" style="font-weight: bold;">default</span><span class="f_CodeExample">-server inter 3s fastinter 1s fall 3 rise 2 on-marked-down shutdown-sessions</span><br />
|
||
<span class="f_CodeExample"> server postgres-server1 postgres-server1.your_domain:6432 check port 8008</span><br />
|
||
<span class="f_CodeExample"> server postgres-server2 postgres-server2.your_domain:6432 check port 8008</span><br />
|
||
<span class="f_CodeExample"> server postgres-server3 postgres-server3.your_domain:6432 check port 8008</span><br />
|
||
<span class="f_CodeExample">### PostgreSQL ###</span></p>
|
||
</td>
|
||
</tr>
|
||
</table>
|
||
</div>
|
||
<p class="p_Normal" style="margin: 0 0 0 34px;"><a class="dropdown-toggle" style="font-style: normal; font-weight: normal; color: #000000; background-color: transparent; text-decoration: none;" href="javascript:HMToggle('toggle','TOGGLE0186A4')">Example of a HAProxy configuration using SSL</a></p>
|
||
<div id="TOGGLE0186A4" class="dropdown-toggle-body" style="text-align: left; text-indent: 0; line-height: 1.80; padding: 0 0 0 0; margin: 0 0 0 34px;"><table style="border:none; border-spacing:0;">
|
||
<tr>
|
||
<td style="vertical-align:top; padding:0; border:none"><p class="p_Normal" style="line-height: 1.28; margin: 0 0 11px 0;"><span style="font-family: Inter;">Enabling SSL is possible if OpenSSL support is built in. In the </span><code><b>crt</b></code><span style="font-family: Inter;"> parameter, specify the path to the PEM file containing the required certificates and associated private keys (<a href="fullchain-sertificate.html" class="topiclink">fullchain certificate</a>). If the file does not contain a private key, HAProxy will attempt to load the key from the same path with a </span><span style="font-family: Inter; font-weight: bold;">.key</span><span style="font-family: Inter;"> suffix.</span></p>
|
||
<p class="p_Normal"> <br />
|
||
If a directory name is used instead of a PEM file, all files found in that directory will be loaded in alphabetical order, excluding files ending in <span style="font-weight: bold;">.issuer</span>, <span style="font-weight: bold;">.ocsp</span>, and <span style="font-weight: bold;">.sctl</span> (reserved solutions).</p>
|
||
<p class="p_Normal"> <br />
|
||
<span style="font-family: Inter;">In the </span><code><b>ca-file</b></code><span style="font-family: Inter;"> parameter, specify the path to the PEM file containing the root certificate. For more details, refer to the </span><span style="font-family: Inter; font-weight: bold;">Configuration Manual</span><span style="font-family: Inter;"> for the used version of HAProxy. For example, for</span><span style="font-size: 13px; font-family: Inter; color: #394149;"> <a href="https://cbonte.github.io/haproxy-dconv/2.5/configuration.html#5.1-crt" target="_blank" class="weblink">HAProxy 2.5</a>:</span><br />
|
||
<span style="font-size: 13px; font-family: Inter; color: #394149;"> </span></p>
|
||
<p class="p_CodeExample" style="line-height: 1.80; white-space: normal; page-break-inside: auto; margin: 0 0 0 34px;"><span class="f_CodeExample">### PostgreSQL ###</span><br />
|
||
<span class="f_CodeExample">listen postgres_master</span><br />
|
||
<span class="f_CodeExample"> bind haproxy-server.your_domain:5000 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem</span><br />
|
||
<span class="f_CodeExample"> option tcplog</span><br />
|
||
<span class="f_CodeExample"> option httpchk OPTIONS /master</span><br />
|
||
<span class="f_CodeExample"> http-check expect status 200</span><br />
|
||
<span class="f_CodeExample"> </span><span class="f_CodeExample">default</span><span class="f_CodeExample">-server inter 3s fastinter 1s fall 3 rise 4 on-marked-down shutdown-sessions</span><br />
|
||
<span class="f_CodeExample"> server postgres-server1 postgres-server1.your_domain:6432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
|
||
<span class="f_CodeExample"> server postgres-server2 postgres-server2.your_domain:6432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
|
||
<span class="f_CodeExample"> server postgres-server3 postgres-server3.your_domain:6432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
|
||
<span class="f_CodeExample"> </span><br />
|
||
<span class="f_CodeExample">listen postgres_replicas</span><br />
|
||
<span class="f_CodeExample"> bind haproxy-server.your_domain:5001 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem</span><br />
|
||
<span class="f_CodeExample"> option tcplog</span><br />
|
||
<span class="f_CodeExample"> option httpchk OPTIONS /replica</span><br />
|
||
<span class="f_CodeExample"> balance roundrobin</span><br />
|
||
<span class="f_CodeExample"> http-check expect status 200</span><br />
|
||
<span class="f_CodeExample"> </span><span class="f_CodeExample">default</span><span class="f_CodeExample">-server inter 3s fastinter 1s fall 3 rise 2 on-marked-down shutdown-sessions</span><br />
|
||
<span class="f_CodeExample"> server postgres-server1 postgres-server1.your_domain:6432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA.your_domain.pem</span><br />
|
||
<span class="f_CodeExample"> server postgres-server2 postgres-server2.your_domain:6432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA.your_domain.pem</span><br />
|
||
<span class="f_CodeExample"> server postgres-server3 postgres-server3.your_domain:6432 check port 8008 ssl crt /etc/haproxy/ssl/haproxy-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
|
||
<span class="f_CodeExample">### PostgreSQL ###</span></p>
|
||
</td>
|
||
</tr>
|
||
</table>
|
||
</div>
|
||
<ol style="list-style-type:upper-roman" start="3">
|
||
<li value="3" class="p_Normal">Restart HAProxy to apply changes:</li></ol>
|
||
<p class="p_CodeExample" style="page-break-inside: avoid; margin: 0 0 0 34px;"><span class="f_CodeExample">sudo systemctl restart haproxy</span></p>
|
||
|
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