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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; High availability infrastructure / Hot Standby PostgreSQL cluster</p>
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<div class="topic__title"><h1 class="p_Heading1"><span class="f_Heading1">Hot Standby PostgreSQL cluster</span></h1>
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<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">As an addition to a <a href="configure-postgresql.html" class="topiclink">PostgreSQL cluster</a>, you can use a geographically separate standby PostgreSQL cluster for disaster tolerance. It maximizes availability and ensures emergency recovery. The standby PostgreSQL cluster only includes backup nodes replicated from a remote primary. Read more: </span><span style="font-family: Inter; color: #0563c1;"><a href="https://patroni.readthedocs.io/en/latest/replica_bootstrap.html#standby-cluster" target="_blank" class="weblink">https://patroni.readthedocs.io/en/latest/replica_bootstrap.html#standby-cluster</a></span><span style="font-family: Inter;">.</span></p>
<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">This type of clusters has the following elements:</span></p>
<ul style="list-style-type:disc">
<li style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">A backup leader acting the same way as a regular leader of the cluster, except that it is replicated from a remote primary.</span></li><li style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">Cascading replicas replicated from the backup leader.</span></li></ul>
<h2 class="p_Heading2"><span class="f_Heading2">Step 1: Configure PostgreSQL</span></h2>
<ol style="list-style-type:upper-roman">
<li value="1" style="line-height: 1.20; margin-top: 0; margin-right: 0; margin-bottom: 0;"><span style="font-family: Inter;">On each database servers, add information about all nodes of each cluster to the </span><code><b>pg_hba.conf</b></code><span style="font-size: 13px;"> </span><span style="font-family: Inter;">file. This will allow for connections from different servers:</span></li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">#Patroni</span><br />
<span class="f_CodeExample">host all all 0.0.0.0/0 md5</span><br />
<span class="f_CodeExample">#Cluster hosts 1</span><br />
<span class="f_CodeExample">host replication replicator 192.168.1.1/32 md5</span><br />
<span class="f_CodeExample">host replication replicator 192.168.1.2/32 md5</span><br />
<span class="f_CodeExample">host replication replicator 192.168.1.3/32 md5</span><br />
<span class="f_CodeExample">#Standby сluster hosts 2</span><br />
<span class="f_CodeExample">host replication replicator 192.168.2.1/32 md5</span><br />
<span class="f_CodeExample">host replication replicator 192.168.2.2/32 md5</span><br />
<span class="f_CodeExample">host replication replicator 192.168.2.3/32 md5</span></p>
<ol style="list-style-type:upper-roman" start="2">
<li value="2" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">Restart PostgreSQL on all the nodes:</span></li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">systemctl restart postgresql</span></p>
<h2 class="p_Heading2"><span class="f_Heading2">Step 2: Configure Patroni</span></h2>
<ol style="list-style-type:upper-roman">
<li value="1" style="line-height: 1.20; margin-top: 0; margin-right: 0; margin-bottom: 0;"><span style="font-family: Inter;">On the standby clusters servers, in the </span><code><b>/etc/patroni/config.yml</b></code><span style="font-size: 13px;"> </span><span style="font-family: Inter;">file, change the values of </span><code><b>scope</b></code><span style="font-family: Inter; font-weight: bold;"> </span><span style="font-family: Inter;">and </span><code><b>name</b></code><span style="font-family: Inter;">, as they shouldnt be the same as in the main cluster. Edit the addresses of all the servers:</span></li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">scope: postgres-cluster2 # The&nbsp;same&nbsp;value&nbsp;for&nbsp;all&nbsp;the&nbsp;nodes&nbsp;of&nbsp;the&nbsp;standby&nbsp;cluster&nbsp;</span><br />
<span class="f_CodeExample">name: postgresql-server4 # Different&nbsp;values&nbsp;on&nbsp;each&nbsp;node&nbsp;of&nbsp;the&nbsp;standby&nbsp;cluster</span><span style="font-family: Inter;">&nbsp;</span></p>
<ol style="list-style-type:upper-roman" start="2">
<li value="2" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">Add </span><code><b>standby_cluster</b></code><span style="font-family: Inter;"> to the </span><code><b>bootstrap</b></code><span style="font-family: Inter;"> section. Add </span><code><b>dcs</b></code><span style="font-family: Inter;"> to the current configuration file </span><code><b>/etc/patroni/config.yml</b></code><span style="font-family: Inter;">. Specify the remote primary. In this example, it is defined using HAproxy:</span></li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">bootstrap:</span><br />
<span class="f_CodeExample">dcs:</span><br />
<span class="f_CodeExample"> &nbsp;standby_cluster:</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;host: haproxy-server.your_domain</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;port: 5000</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;create_replica_methods:</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;- basebackup</span></p>
<ol style="list-style-type:upper-roman" start="3">
<li value="3" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">On the main cluster and the standby cluster, add the addresses of all servers used in them to </span><code><b>pg_hba</b></code><span style="font-family: Inter;"> in the current configuration file </span><code><b>etc/patroni/config.yml</b></code><span style="font-family: Inter;">:</span></li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">pg_hba:</span><br />
<span class="f_CodeExample">- host all all 0.0.0.0/0 md5</span><br />
<span class="f_CodeExample">- host replication replicator localhost trust</span><br />
<span class="f_CodeExample">#Cluster hosts 1</span><br />
<span class="f_CodeExample">- host replication replicator 192.168.1.1/32 md5</span><br />
<span class="f_CodeExample">- host replication replicator 192.168.1.2/32 md5</span><br />
<span class="f_CodeExample">- host replication replicator 192.168.1.3/32 md5</span><br />
<span class="f_CodeExample">#Cluster hosts 2</span><br />
<span class="f_CodeExample">- host replication replicator 192.168.2.1/32 md5</span><br />
<span class="f_CodeExample">- host replication replicator 192.168.2.2/32 md5</span><br />
<span class="f_CodeExample">- host replication replicator 192.168.2.3/32 md5</span></p>
<ol style="list-style-type:upper-roman" start="4">
<li value="4" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">Run the Patroni</span><span style="font-family: Inter; font-weight: bold;"> </span><span style="font-family: Inter;">service:</span></li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo systemctl enable --now patroni.service</span></p>
<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">If the Patroni service has been previously started on the standby cluster, stop the service on each of the standby clusters nodes. Delete the </span><code><b>postgresql</b></code><span style="font-family: Inter;"> data folder and clear information about the cluster. Run the Patroni service again:</span></p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">sudo systemctl stop patroni</span><br />
<span class="f_CodeExample">sudo rm -rf /var/lib/postgresql/10/main</span><br />
<span class="f_CodeExample">sudo etcdctl rm --recursive /service/postgres-cluster2</span><br />
<span class="f_CodeExample">sudo systemctl restart patroni</span></p>
<ol style="list-style-type:upper-roman" start="5">
<li value="5" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">Check the standby clusters state:</span></li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">patronictl -c /etc/patroni/config.yml list</span></p>
<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">The standby clusters ID has to be the same as the main clusters. The leaders role has to be </span><span style="font-family: Inter; font-weight: bold;">Standby Leader</span><span style="font-family: Inter;">.</span></p>
<ol style="list-style-type:upper-roman" start="6">
<li value="6" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">To make the standby cluster become the main one if the original cluster is not available, delete </span><code><b>standby_cluster</b></code><span style="font-family: Inter;"> from the current Patroni configuration by running the following command:</span></li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">patronictl edit-config --force -s standby_cluster.host='' -s standby_cluster.port='' -s standby_cluster.create_replica_methods=''</span></p>
<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">It is important to avoid two primaries working at the same time. When the original cluster is recovered, the backup cluster will still be considered main.</span></p>
<ol style="list-style-type:upper-roman" start="7">
<li value="7" style="line-height: 1.20; margin-top: 7px; margin-right: 0; margin-bottom: 7px;"><span style="font-family: Inter;">To make the new main cluster become a standby cluster again after the original cluster is recovered, add </span><code><b>standby_cluster</b></code><span style="font-family: Inter;"> to the current Patroni configuration by running the following command:</span></li></ol>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">patronictl edit-config --force -s standby_cluster.host=haproxy-server.your_domain -s standby_cluster.port=5000 -s standby_cluster.create_replica_methods='- basebackup'</span></p>
<h2 class="p_Heading2"><span class="f_Heading2">Step 3: Configure HAProxy (postgres)</span></h2>
<p style="line-height: 1.20; margin: 7px 0 16px 0;"><span style="font-family: Inter;">Complete the configuration of HAProxy in the </span><code><b>postgres</b></code><span style="font-family: Inter;"> section of the file by specifying the addresses of all the servers used in the clusters:</span></p>
<p class="p_CodeExample" style="page-break-inside: avoid;"><span class="f_CodeExample">listen postgres_master</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;bind haproxy-server.your_domain:5000</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;option tcplog</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;option httpchk OPTIONS /master</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;http-check expect status 200</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;</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 />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server1 postgres-server1.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server2 postgres-server2.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server3 postgres-server3.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server4 postgres-server4.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server5 postgres-server5.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server6 postgres-server6.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample">&nbsp;</span><br />
<span class="f_CodeExample">listen postgres_replicas</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;bind haproxy-server.your_domain:5001</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;option tcplog</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;option httpchk OPTIONS /replica</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;balance roundrobin</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;http-check expect status 200</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;</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"> &nbsp;&nbsp;&nbsp;server postgres-server1 postgres-server1.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server2 postgres-server2.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server3 postgres-server3.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server4 postgres-server4.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server5 postgres-server5.your_domain:5432 check port 8008</span><br />
<span class="f_CodeExample"> &nbsp;&nbsp;&nbsp;server postgres-server6 postgres-server6.your_domain:5432 check port 8008</span></p>
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