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| <a href="." >Avoiding Network Isolation</a> |
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| <h1 id="network-isolation">Network Isolation</h1> |
| <p>In case the server is isolated, say for a network failure, the server will be isolated for its peers on a network of brokers. If you are playing with replication the backup may think the backup failed and you may endup with two live nodes, what is called the split brain.</p> |
| <h1 id="pinging-the-network">Pinging the network</h1> |
| <p>You may configure one more addresses on the broker.xml that are part of your network topology, that will be pinged through the life cycle of the server.</p> |
| <p>The server will stop itself until the network is back on such case.</p> |
| <p>If you execute the create command passing a -ping argument, you will create a default xml that is ready to be used with network checks:</p> |
| <pre><code>./artemis create /myDir/myServer --ping 10.0.0.1 |
| </code></pre><p>This XML part will be added to your broker.xml:</p> |
| <pre><code class="lang-xml"><span class="hljs-comment"><!-- |
| You can specify the NIC you want to use to verify if the network |
| <network-check-NIC>theNickName</network-check-NIC> |
| --></span> |
| |
| <span class="hljs-comment"><!-- |
| Use this to use an HTTP server to validate the network |
| <network-check-URL-list>http://www.apache.org</network-check-URL-list> --></span> |
| |
| <span class="hljs-tag"><<span class="hljs-name">network-check-period</span>></span>10000<span class="hljs-tag"></<span class="hljs-name">network-check-period</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">network-check-timeout</span>></span>1000<span class="hljs-tag"></<span class="hljs-name">network-check-timeout</span>></span> |
| |
| <span class="hljs-comment"><!-- this is a comma separated list, no spaces, just DNS or IPs |
| it should accept IPV6 |
| |
| Warning: Make sure you understand your network topology as this is meant to check if your network is up. |
| Using IPs that could eventually disappear or be partially visible may defeat the purpose. |
| You can use a list of multiple IPs, any successful ping will make the server OK to continue running --></span> |
| <span class="hljs-tag"><<span class="hljs-name">network-check-list</span>></span>10.0.0.1<span class="hljs-tag"></<span class="hljs-name">network-check-list</span>></span> |
| |
| <span class="hljs-comment"><!-- use this to customize the ping used for ipv4 addresses --></span> |
| <span class="hljs-tag"><<span class="hljs-name">network-check-ping-command</span>></span>ping -c 1 -t %d %s<span class="hljs-tag"></<span class="hljs-name">network-check-ping-command</span>></span> |
| |
| <span class="hljs-comment"><!-- use this to customize the ping used for ipv addresses --></span> |
| <span class="hljs-tag"><<span class="hljs-name">network-check-ping6-command</span>></span>ping6 -c 1 %2$s<span class="hljs-tag"></<span class="hljs-name">network-check-ping6-command</span>></span> |
| </code></pre> |
| <p>Once you lose connectivity towards 10.0.0.1 on the given example |
| , you will see see this output at the server:</p> |
| <pre><code>09:49:24,562 WARN [org.apache.activemq.artemis.core.server.NetworkHealthCheck] Ping Address /10.0.0.1 wasn't reacheable |
| 09:49:36,577 INFO [org.apache.activemq.artemis.core.server.NetworkHealthCheck] Network is unhealthy, stopping service ActiveMQServerImpl::serverUUID=04fd5dd8-b18c-11e6-9efe-6a0001921ad0 |
| 09:49:36,625 INFO [org.apache.activemq.artemis.core.server] AMQ221002: Apache ActiveMQ Artemis Message Broker version 1.6.0 [04fd5dd8-b18c-11e6-9efe-6a0001921ad0] stopped, uptime 14.787 seconds |
| 09:50:00,653 WARN [org.apache.activemq.artemis.core.server.NetworkHealthCheck] ping: sendto: No route to host |
| 09:50:10,656 WARN [org.apache.activemq.artemis.core.server.NetworkHealthCheck] Host is down: java.net.ConnectException: Host is down |
| at java.net.Inet6AddressImpl.isReachable0(Native Method) [rt.jar:1.8.0_73] |
| at java.net.Inet6AddressImpl.isReachable(Inet6AddressImpl.java:77) [rt.jar:1.8.0_73] |
| at java.net.InetAddress.isReachable(InetAddress.java:502) [rt.jar:1.8.0_73] |
| at org.apache.activemq.artemis.core.server.NetworkHealthCheck.check(NetworkHealthCheck.java:295) [artemis-commons-1.6.0-SNAPSHOT.jar:1.6.0-SNAPSHOT] |
| at org.apache.activemq.artemis.core.server.NetworkHealthCheck.check(NetworkHealthCheck.java:276) [artemis-commons-1.6.0-SNAPSHOT.jar:1.6.0-SNAPSHOT] |
| at org.apache.activemq.artemis.core.server.NetworkHealthCheck.run(NetworkHealthCheck.java:244) [artemis-commons-1.6.0-SNAPSHOT.jar:1.6.0-SNAPSHOT] |
| at org.apache.activemq.artemis.core.server.ActiveMQScheduledComponent$2.run(ActiveMQScheduledComponent.java:189) [artemis-commons-1.6.0-SNAPSHOT.jar:1.6.0-SNAPSHOT] |
| at org.apache.activemq.artemis.core.server.ActiveMQScheduledComponent$3.run(ActiveMQScheduledComponent.java:199) [artemis-commons-1.6.0-SNAPSHOT.jar:1.6.0-SNAPSHOT] |
| at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [rt.jar:1.8.0_73] |
| at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [rt.jar:1.8.0_73] |
| at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [rt.jar:1.8.0_73] |
| at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [rt.jar:1.8.0_73] |
| at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_73] |
| at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_73] |
| at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_73] |
| </code></pre><p>Once you re establish your network connections towards the configured check list:</p> |
| <pre><code>09:53:23,461 INFO [org.apache.activemq.artemis.core.server.NetworkHealthCheck] Network is healthy, starting service ActiveMQServerImpl:: |
| 09:53:23,462 INFO [org.apache.activemq.artemis.core.server] AMQ221000: live Message Broker is starting with configuration Broker Configuration (clustered=false,journalDirectory=./data/journal,bindingsDirectory=./data/bindings,largeMessagesDirectory=./data/large-messages,pagingDirectory=./data/paging) |
| 09:53:23,462 INFO [org.apache.activemq.artemis.core.server] AMQ221013: Using NIO Journal |
| 09:53:23,462 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-server]. Adding protocol support for: CORE |
| 09:53:23,463 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-amqp-protocol]. Adding protocol support for: AMQP |
| 09:53:23,463 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-hornetq-protocol]. Adding protocol support for: HORNETQ |
| 09:53:23,463 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-mqtt-protocol]. Adding protocol support for: MQTT |
| 09:53:23,464 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-openwire-protocol]. Adding protocol support for: OPENWIRE |
| 09:53:23,464 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-stomp-protocol]. Adding protocol support for: STOMP |
| 09:53:23,541 INFO [org.apache.activemq.artemis.core.server] AMQ221003: Deploying queue jms.queue.DLQ |
| 09:53:23,541 INFO [org.apache.activemq.artemis.core.server] AMQ221003: Deploying queue jms.queue.ExpiryQueue |
| 09:53:23,549 INFO [org.apache.activemq.artemis.core.server] AMQ221020: Started Acceptor at 0.0.0.0:61616 for protocols [CORE,MQTT,AMQP,STOMP,HORNETQ,OPENWIRE] |
| 09:53:23,550 INFO [org.apache.activemq.artemis.core.server] AMQ221020: Started Acceptor at 0.0.0.0:5445 for protocols [HORNETQ,STOMP] |
| 09:53:23,554 INFO [org.apache.activemq.artemis.core.server] AMQ221020: Started Acceptor at 0.0.0.0:5672 for protocols [AMQP] |
| 09:53:23,555 INFO [org.apache.activemq.artemis.core.server] AMQ221020: Started Acceptor at 0.0.0.0:1883 for protocols [MQTT] |
| 09:53:23,556 INFO [org.apache.activemq.artemis.core.server] AMQ221020: Started Acceptor at 0.0.0.0:61613 for protocols [STOMP] |
| 09:53:23,556 INFO [org.apache.activemq.artemis.core.server] AMQ221007: Server is now live |
| 09:53:23,556 INFO [org.apache.activemq.artemis.core.server] AMQ221001: Apache ActiveMQ Artemis Message Broker version 1.6.0 [0.0.0.0, nodeID=04fd5dd8-b18c-11e6-9efe-6a0001921ad0] |
| </code></pre><h1 id="warning">Warning</h1> |
| <blockquote> |
| <p>Make sure you understand your network topology as this is meant to validate your network. |
| Using IPs that could eventually disappear or be partially visible may defeat the purpose. |
| You can use a list of multiple IPs. Any successful ping will make the server OK to continue running</p> |
| </blockquote> |
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