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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 document server</p>
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<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">Configure HAProxy for document server</span></h1>
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<p class="p_Normal">The architecture of a highly available BRIX cluster involves the interaction of BRIX application microservices with the R7-Office document server, ONLYOFFICE Docs Server. The HAProxy configuration discussed in this article assumes even load balancing of traffic between the two document servers.</p>
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<h2 class="p_Heading2"><span class="f_Heading2">Example HAProxy configuration for document server</span></h2>
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<p class="p_Normal">HAProxy evenly distributes client connections arriving at <code><b>r7office.your_domain</b></code> between the two document servers. </p>
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<p class="p_Normal">Open the <span style="font-weight: bold;">haproxy.cfg</span> configuration file for editing using the command:</p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo nano /etc/haproxy/haproxy.cfg</span></p>
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<p class="p_Normal">Example configuration for load balancing between two document servers using HAProxy to add to the <span style="font-weight: bold;">haproxy.cfg </span>file:</p>
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<p class="p_CodeExample" style="white-space: normal; page-break-inside: avoid;"><span class="f_CodeExample">### Docs Server ###</span><br />
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<span class="f_CodeExample">listen</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">docsserver</span><br />
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<span class="f_CodeExample"> bind</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">r7office.your_domain:80</span><br />
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<span class="f_CodeExample"> mode</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">http</span><br />
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<span class="f_CodeExample"> balance</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">leastconn</span><br />
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<span class="f_CodeExample"> server</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">r7office1</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">r7office-server1.your_domain:80</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">2s</span><br />
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<span class="f_CodeExample"> server</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">r7office2</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">r7office-server2.your_domain:80</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">2s</span><br />
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<span class="f_CodeExample">### Docs Server ###</span></p>
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<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')">Example HAProxy configuration using SSL</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 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_Normal"> <br />
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SSL can be enabled if OpenSSL support is embedded. In the <code><b>crt</b></code> 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 style="font-weight: bold;">key</span> suffix.</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, except for files ending in .<span style="font-weight: bold;">issuer</span>, .<span style="font-weight: bold;">ocsp</span>, or .<span style="font-weight: bold;">sctl</span> (reserved solutions). </p>
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<p class="p_Normal"> <br />
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In the <code><b>ca-file</b></code> parameter, specify the path to the PEM file containing the root certificate. Read more in the Configuration Manual for the HAProxy version used. Example for <a href="https://cbonte.github.io/haproxy-dconv/2.5/configuration.html#5.1-crt" target="_blank" class="weblink">HAProxy 2.5</a>:<br />
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</p>
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<p class="p_CodeExample" style="white-space: normal; page-break-inside: avoid;"><span class="f_CodeExample">### Docs Server ###</span><br />
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<span class="f_CodeExample">listen docsserver</span><br />
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<span class="f_CodeExample"> bind r7office.your_domain:443 ssl crt /etc/haproxy/ssl/r7office-server.your_domain.pem</span><br />
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<span class="f_CodeExample"> mode http</span><br />
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<span class="f_CodeExample"> balance leastconn</span><br />
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<span class="f_CodeExample"> server r7office1 r7office-server1.your_domain:443 check inter 2s ssl crt /etc/haproxy/ssl/r7office-server.your_domain.pem</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">ca-file</span><span class="f_CodeExample" style="color: #ffffff;"> </span><span class="f_CodeExample">/etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
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<span class="f_CodeExample"> server r7office2 r7office-server2.your_domain:443 check inter 2s ssl crt /etc/haproxy/ssl/r7office-server.your_domain.pem ca-file /etc/haproxy/ssl/rootCA_your_domain.pem</span><br />
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<span class="f_CodeExample">### Docs Server ###</span></p>
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</td>
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</tr>
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<p class="p_Normal">Restart HAProxy:</p>
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<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo systemctl restart haproxy</span></p>
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