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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 Redis Sentinel</p>
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<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">Configure HAProxy for Redis Sentinel</span></h1>
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<p style="line-height: 1.28; margin: 0 0 11px 0;">The architecture of a high-availability BRIX cluster involves interaction between the BRIX application microservices and Redis Sentinel. To ensure reliable load balancing within the system, configure HAProxy for Redis Sentinel. This setup allows traffic to be redirected to the primary Redis server in case of a technical failure, ensuring continuous system operation</p>
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<h2 class="p_Heading2"><span class="f_Heading2">Example HAProxy configuration for Redis Sentinel</span></h2>
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<p style="line-height: 1.20; margin: 11px 0 15px 0;"><span style="color: #394149;">ВThis article provides a configuration for identifying the primary Redis server and redirecting traffic to it. HAProxy will automatically check the </span><code><b>6379</b></code><span style="color: #394149;"> port on Redis servers and determine the current server with the </span><code><b>master</b></code><span style="color: #394149;"> role.</span></p>
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<p style="line-height: 1.20; margin: 11px 0 15px 0;"><span style="color: #394149;">Steps to create HAProxy configuration for Redis Sentinel:</span></p>
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<ol style="list-style-type:upper-roman">
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<li value="1" style="line-height: 1.28; margin-top: 0; margin-right: 0; margin-bottom: 11px;"><span style="color: #394149;">Open the </span><code><b>haproxy.cfg</b></code><span style="font-size: 13px;"> </span><span style="color: #394149;">configuration file for editing using the command:</span></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" style="line-height: 1.20; margin-top: 11px; margin-right: 0; margin-bottom: 15px;"><span style="color: #394149;">Make changes to the </span><code><b>haproxy.cfg</b></code><span style="font-size: 13px;"> </span><span style="color: #394149;">configuration file:</span></li></ol>
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<p class="p_Normal" style="margin: 0 0 0 33px;"><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: 1.0; page-break-inside: avoid; padding: 0 0 0 0; margin: 0 0 0 0;"><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="white-space: normal; page-break-inside: auto;"><span class="f_CodeExample">### Redis ###</span><br />
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<span class="f_CodeExample">frontend</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">redis_master</span><br />
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<span class="f_CodeExample"> bind</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">haproxy-server.your_domain:6379</span><br />
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<span class="f_CodeExample"> mode</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">tcp</span><br />
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<span class="f_CodeExample"> option</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">tcplog</span><br />
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<span class="f_CodeExample"> option</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">clitcpka</span><br />
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<span class="f_CodeExample"> timeout</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">client</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">24h</span><br />
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<span class="f_CodeExample"> default_backend</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">redis_master</span><br />
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<span class="f_CodeExample"> </span><br />
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<span class="f_CodeExample">backend</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">redis_master</span><br />
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<span class="f_CodeExample"> balance</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">first</span><br />
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<span class="f_CodeExample"> mode</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">tcp</span><br />
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<span class="f_CodeExample"> timeout</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">queue</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">2s</span><br />
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<span class="f_CodeExample"> timeout</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">connect</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">2s</span><br />
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<span class="f_CodeExample"> timeout</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">1s</span><br />
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<span class="f_CodeExample"> option</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">srvtcpka</span><br />
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<span class="f_CodeExample"> timeout</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">server</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">24h</span><br />
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<span class="f_CodeExample"> option</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">tcp-check</span><br />
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<span class="f_CodeExample"> tcp-check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">connect</span><br />
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<span class="f_CodeExample"> tcp-check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">send</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">AUTH\</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample"><PASSWORD>\r\n</span><br />
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<span class="f_CodeExample"> tcp-check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">send</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">PING\r\n</span><br />
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<span class="f_CodeExample"> tcp-check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">expect</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">string</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">+PONG</span><br />
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<span class="f_CodeExample"> tcp-check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">send</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">info\</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">replication\r\n</span><br />
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<span class="f_CodeExample"> tcp-check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">expect</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">string</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">role:master</span><br />
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<span class="f_CodeExample"> tcp-check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">send</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">QUIT\r\n</span><br />
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<span class="f_CodeExample"> tcp-check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">expect</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">string</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">+OK</span><br />
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<span class="f_CodeExample"> server</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">redis-server1</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">redis-server1.your_domain:6379</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">inter</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">5s</span><br />
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<span class="f_CodeExample"> server</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">redis-server2</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">redis-server2.your_domain:6379</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">inter</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">5s</span><br />
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<span class="f_CodeExample"> server</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">redis-server3</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">redis-server3.your_domain:6379</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">check</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">inter</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">5s</span><br />
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<span class="f_CodeExample">### Redis ###</span></p>
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</td>
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<ol style="list-style-type:upper-roman" start="3">
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<li value="3" style="line-height: 1.20; margin-top: 11px; margin-right: 0; margin-bottom: 15px;"><span style="font-size: 13px; color: #394149;">Restart HAProxy to apply changes:</span></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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<p style="line-height: 1.28; margin: 0 0 11px 0;"><span style="font-size: 17px; font-family: Calibri,Vectora,'Droid Sans','Open Sans',Frutiger,sans-serif;">After completing the HAProxy configuration, traffic will be directed to the primary Redis server (master). In case of failures, this setup ensures the stable operation of the system.</span></p>
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