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1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Administration</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Pulsar proxy</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Pulsar proxy</h1></header><p>Pulsar proxy is an optional gateway. Pulsar proxy is used when direct connections between clients and Pulsar brokers are either infeasible or undesirable. For example, when you run Pulsar in a cloud environment or on <a href="https://kubernetes.io" target="_blank" rel="noopener noreferrer">Kubernetes</a> or an analogous platform, you can run Pulsar proxy.</p><p>The Pulsar proxy is not intended to be exposed on the public internet. The security considerations in the current design expect network perimeter security. The requirement of network perimeter security can be achieved with private networks.</p><p>If a proxy deployment cannot be protected with network perimeter security, the alternative would be to use <a href="/docs/3.1.x/concepts-proxy-sni-routing/">Pulsar's "Proxy SNI routing" feature</a> with a properly secured and audited solution. In that case Pulsar proxy component is not used at all.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="configure-the-proxy">Configure the proxy<a href="#configure-the-proxy" class="hash-link" aria-label="Direct link to Configure the proxy" title="Direct link to Configure the proxy"></a></h2><p>Before using a proxy, you need to configure it with a broker's address in the cluster. You can configure the broker URL in the proxy configuration, or the proxy to connect directly using service discovery.</p><blockquote><p>In a production environment service discovery is not recommended.</p></blockquote><h3 class="anchor anchorWithStickyNavbar_LWe7" id="use-broker-urls">Use broker URLs<a href="#use-broker-urls" class="hash-link" aria-label="Direct link to Use broker URLs" title="Direct link to Use broker URLs"></a></h3><p>It is more secure to specify a URL to connect to the brokers.</p><p>Proxy authorization requires access to ZooKeeper, so if you use these broker URLs to connect to the brokers, you need to disable authorization at the Proxy level. Brokers still authorize requests after the proxy forwards them.</p><p>You can configure the broker URLs in <code>conf/proxy.conf</code> as follows.</p><div class="language-properties codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-properties codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token key attr-name" style="color:rgb(241, 250, 140)">brokerServiceURL</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">pulsar://brokers.example.com:6650</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key attr-name" style="color:rgb(241, 250, 140)">brokerWebServiceURL</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">http://brokers.example.com:8080</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key attr-name" style="color:rgb(241, 250, 140)">functionWorkerWebServiceURL</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">http://function-workers.example.com:8080</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>If you use TLS, configure the broker URLs in the following way:</p><div class="language-properties codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-properties codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token key attr-name" style="color:rgb(241, 250, 140)">brokerServiceURLTLS</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">pulsar+ssl://brokers.example.com:6651</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key attr-name" style="color:rgb(241, 250, 140)">brokerWebServiceURLTLS</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">https://brokers.example.com:8443</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key attr-name" style="color:rgb(241, 250, 140)">functionWorkerWebServiceURL</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">https://function-workers.example.com:8443</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The hostname in the URLs provided should be a DNS entry that points to multiple brokers or a virtual IP address, which is backed by multiple broker IP addresses, so that the proxy does not lose connectivity to Pulsar cluster if a single broker becomes unavailable.</p><p>The ports to connect to the brokers (6650 and 8080, or in the case of TLS, 6651 and 8443) should be open in the network ACLs.</p><p>Note that if you do not use functions, you do not need to configure <code>functionWorkerWebServiceURL</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="use-service-discovery">Use service discovery<a href="#use-service-discovery" class="hash-link" aria-label="Direct link to Use service discovery" title="Direct link to Use service discovery"></a></h3><p>Pulsar uses <a href="https://zookeeper.apache.org" target="_blank" rel="noopener noreferrer">ZooKeeper</a> for service discovery. To connect the proxy to ZooKeeper, specify the following in <code>conf/proxy.conf</code>.</p><div class="language-properties codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-properties codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token key attr-name" style="color:rgb(241, 250, 140)">metadataStoreUrl</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">my-zk-0:2181,my-zk-1:2181,my-zk-2:2181</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key attr-name" style="color:rgb(241, 250, 140)">configurationMetadataStoreUrl</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">my-zk-0:2184,my-zk-remote:2184</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><blockquote><p>To use service discovery, you need to open the network ACLs, so the proxy can connects to the ZooKeeper nodes through the ZooKeeper client port (port <code>2181</code>) and the configuration store client port (port <code>2184</code>).</p></blockquote><blockquote><p>However, it is not secure to use service discovery. Because if the network ACL is open, when someone compromises a proxy, they have full access to ZooKeeper.</p></blockquote><h3 class="anchor anchorWithStickyNavbar_LWe7" id="restricting-target-broker-addresses-to-mitigate-cve-2022-24280">Restricting target broker addresses to mitigate CVE-2022-24280<a href="#restricting-target-broker-addresses-to-mitigate-cve-2022-24280" class="hash-link" aria-label="Direct link to Restricting target broker addresses to mitigate CVE-2022-24280" title="Direct link to Restricting target broker addresses to mitigate CVE-2022-24280"></a></h3><p>The Pulsar Proxy trusts clients to provide valid target broker addresses to connect to. |
| Unless the Pulsar Proxy is explicitly configured to limit access, the Pulsar Proxy is vulnerable as described in the security advisory <a href="https://github.com/apache/pulsar/wiki/CVE-2022-24280" target="_blank" rel="noopener noreferrer">Apache Pulsar Proxy target broker address isn't validated (CVE-2022-24280)</a>.</p><p>It is necessary to limit proxied broker connections to known broker addresses by specifying <code>brokerProxyAllowedHostNames</code> and <code>brokerProxyAllowedIPAddresses</code> settings.</p><p>When specifying <code>brokerProxyAllowedHostNames</code>, it's possible to use a wildcard. |
| Please notice that <code>*</code> is a wildcard that matches any character in the hostname. It also matches dot <code>.</code> characters.</p><p>It is recommended to use a pattern that matches only the desired brokers and no other hosts in the local network. Pulsar lookups will use the default host name of the broker by default. This can be overridden with the <code>advertisedAddress</code> setting in <code>broker.conf</code>.</p><p>To increase security, it is also possible to restrict access with the <code>brokerProxyAllowedIPAddresses</code> setting. It is not mandatory to configure <code>brokerProxyAllowedIPAddresses</code> when <code>brokerProxyAllowedHostNames</code> is properly configured so that the pattern matches only the target brokers. |
| <code>brokerProxyAllowedIPAddresses</code> setting supports a comma separate list of IP address, IP address ranges and IP address networks <a href="https://seancfoley.github.io/IPAddress/IPAddress/apidocs/inet/ipaddr/IPAddressString.html" target="_blank" rel="noopener noreferrer">(supported format reference)</a>.</p><p>Example: limiting by host name in a Kubernetes deployment</p><div class="language-yaml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-yaml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)"># example of limiting to Kubernetes statefulset hostnames that contain "broker-"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token key atrule">PULSAR_PREFIX_brokerProxyAllowedHostNames</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">'*broker-*.*.*.svc.cluster.local'</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Example: limiting by both host name and ip address in a <code>proxy.conf</code> file for host deployment.</p><div class="language-properties codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-properties codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token comment" style="color:rgb(98, 114, 164)"># require "broker" in host name</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key attr-name" style="color:rgb(241, 250, 140)">brokerProxyAllowedHostNames</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">*broker*.localdomain</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token comment" style="color:rgb(98, 114, 164)"># limit target ip addresses to a specific network</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key attr-name" style="color:rgb(241, 250, 140)">brokerProxyAllowedIPAddresses</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">10.0.0.0/8</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Example: limiting by multiple host name patterns and multiple ip address ranges in a <code>proxy.conf</code> file for host deployment.</p><div class="language-properties codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-properties codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token comment" style="color:rgb(98, 114, 164)"># require "broker" in host name</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key attr-name" style="color:rgb(241, 250, 140)">brokerProxyAllowedHostNames</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">*broker*.localdomain,*broker*.otherdomain</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token comment" style="color:rgb(98, 114, 164)"># limit target ip addresses to a specific network or range demonstrating multiple supported formats</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token key attr-name" style="color:rgb(241, 250, 140)">brokerProxyAllowedIPAddresses</span><span class="token punctuation" style="color:rgb(248, 248, 242)">=</span><span class="token value attr-value">10.10.0.0/16,192.168.1.100-120,172.16.2.*,10.1.2.3</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="start-the-proxy">Start the proxy<a href="#start-the-proxy" class="hash-link" aria-label="Direct link to Start the proxy" title="Direct link to Start the proxy"></a></h2><p>To start the proxy:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token builtin class-name" style="color:rgb(189, 147, 249)">cd</span><span class="token plain"> /path/to/pulsar/directory</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">bin/pulsar proxy </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --metadata-store zk:my-zk-1:2181,my-zk-2:2181,my-zk-3:2181 </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --configuration-metadata-store zk:my-zk-1:2181,my-zk-2:2181,my-zk-3:2181</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><blockquote><p>You can run multiple instances of the Pulsar proxy in a cluster.</p></blockquote><h2 class="anchor anchorWithStickyNavbar_LWe7" id="stop-the-proxy">Stop the proxy<a href="#stop-the-proxy" class="hash-link" aria-label="Direct link to Stop the proxy" title="Direct link to Stop the proxy"></a></h2><p>Pulsar proxy runs in the foreground by default. To stop the proxy, simply stop the process in which the proxy is running.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="proxy-frontends">Proxy frontends<a href="#proxy-frontends" class="hash-link" aria-label="Direct link to Proxy frontends" title="Direct link to Proxy frontends"></a></h2><p>You can run Pulsar proxy behind some kind of load-distributing frontend, such as an <a href="https://www.digitalocean.com/community/tutorials/an-introduction-to-haproxy-and-load-balancing-concepts" target="_blank" rel="noopener noreferrer">HAProxy</a> load balancer.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="use-pulsar-clients-with-the-proxy">Use Pulsar clients with the proxy<a href="#use-pulsar-clients-with-the-proxy" class="hash-link" aria-label="Direct link to Use Pulsar clients with the proxy" title="Direct link to Use Pulsar clients with the proxy"></a></h2><p>Once your Pulsar proxy is up and running, preferably behind a load-distributing <a href="#proxy-frontends">frontend</a>, clients can connect to the proxy via whichever address that the frontend uses. If the address is the DNS address <code>pulsar.cluster.default</code>, for example, the connection URL for clients is <code>pulsar://pulsar.cluster.default:6650</code>.</p><p>For more information on Proxy configuration, refer to <a href="/docs/3.1.x/reference-configuration/#pulsar-proxy">Pulsar proxy</a>.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/pulsar-site/edit/main/versioned_docs/version-3.1.x/administration-proxy.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"></div></div></footer></article><nav 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