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| <h1>Log4j Kubernetes Support</h1> |
| <p>Log4j supports Kubernetes by providing a Lookup to retrieve container information.</p><section> |
| <h2><a name="Accessing_Kubernetes"></a>Accessing Kubernetes</h2> |
| <p>The Log4j Kubernetes support requires access to the Docker REST interface. In many cases the REST service |
| can be accessed automatically. If needed the Kubernetes client can be configured any of the standard |
| Log4j configuration locations or via the Spring Boot configuration. Note, however, that since Spring Boot |
| causes logging to initialize 3 times and since the Spring environment is only available during the last |
| Log4j initialization Spring properties will only be available to Log4j in the last initialization.</p></section><section> |
| <h2><a name="Lookup_Attributes"></a>Lookup Attributes</h2> |
| <p>Log4j Kubernetes provides access to the following container attributes:</p> |
| <ul> |
| |
| <li>accountName - The service account name.</li> |
| <li>clusterName - The name of the cluster the application is running in.</li> |
| <li>containerId - The full id assigned to the container.</li> |
| <li>containerName - The name assigned to the container.</li> |
| <li>host - The name of the host.</li> |
| <li>hostIp - The host's ip address.</li> |
| <li>imageId - The id assigned to the image.</li> |
| <li>imageName - The name assigned to the image.</li> |
| <li>labels - All labels formatted in a list.</li> |
| <li>labels.app - The application name.</li> |
| <li>labels.podTemplateHash - The pod's template hash value.</li> |
| <li>masterUrl - The url needed to access the API server.</li> |
| <li>namespaceId - The id of the namespace the various kubernetes components are located within.</li> |
| <li>namespaceName - The namespace the various kubernetes components are located within.</li> |
| <li>podId - The pod's id number.</li> |
| <li>podIp - The pod's ip address.</li> |
| <li>podName - The name of the pod.</li> |
| </ul> |
| <p>Attributes may be accessed by adding</p> |
| |
| <div class="source"><pre class="prettyprint"><code>${k8s:containerId} |
| </code></pre></div> |
| <p>to the configuration. Note that kubernetes variables are only resolved once during logging initialization so they |
| shouldn't be referenced with more than one ‘$’ character.</p></section><section> |
| <h2><a name="Configuration"></a>Configuration</h2> |
| <p>Much of the configuration needed to access the Kubernetes API server is provided automatically by Kubernetes. |
| However, it is not uncommon to need to provide the url required to access the Kubernetes API server or the |
| namespace the application is assigned to. The properties below may either be configured using the Log4j |
| variable names and located by Log4j's normal property resolution mechansim or Log4j will resolve the |
| spring properties when the application is running in Spring Boot and the Spring Environment has been created. |
| Note that Spring Boot initializes logging 3 times and only the last will have a Spring Environment present.</p> |
| <table border="0" class="table table-striped"> |
| <thead> |
| |
| <tr class="a"> |
| <th>Log4j Property Name</th> |
| <th align="right">Spring Property Name</th> |
| <th align="right">Default</th> |
| <th align="right">Description</th></tr> |
| </thead><tbody> |
| |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.apiVersion</td> |
| <td align="right">spring.cloud.kubernetes.client.apiVersion</td> |
| <td align="right">v1</td> |
| <td align="right">Kubernetes API Version</td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.caCertData</td> |
| <td align="right">spring.cloud.kubernetes.client.caCertData</td> |
| <td align="right"> </td> |
| <td align="right">Kubernetes API CACertData</td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.caCertFile</td> |
| <td align="right">spring.cloud.kubernetes.client.caCertFile</td> |
| <td align="right"> </td> |
| <td align="right">Kubernetes API CACertFile</td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.clientCertData</td> |
| <td align="right">spring.cloud.kubernetes.client.clientCertData</td> |
| <td align="right"> </td> |
| <td align="right">Kubernetes API ClientCertData</td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.clientCertFile</td> |
| <td align="right">spring.cloud.kubernetes.client.clientCertFile</td> |
| <td align="right"> </td> |
| <td align="right">Kubernetes API ClientCertFile</td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.clientKeyAlgo</td> |
| <td align="right">spring.cloud.kubernetes.client.clientKeyAlgo</td> |
| <td align="right">RSA</td> |
| <td align="right">Kubernetes API ClientKeyAlgo</td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.clientKeyData</td> |
| <td align="right">spring.cloud.kubernetes.client.clientKeyData</td> |
| <td align="right"> </td> |
| <td align="right">Kubernetes API ClientKeyData</td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.clientKeyFile</td> |
| <td align="right">spring.cloud.kubernetes.client.clientKeyFile</td> |
| <td align="right"> </td> |
| <td align="right">Kubernetes API ClientKeyFile</td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.clientKeyPassPhrase</td> |
| <td align="right">spring.cloud.kubernetes.client.clientKeyPassphrase</td> |
| <td align="right">changeit</td> |
| <td align="right">Kubernetes API ClientKeyPassphrase</td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.connectionTimeout</td> |
| <td align="right">spring.cloud.kubernetes.client.connectionTimeout</td> |
| <td align="right">10s</td> |
| <td align="right">Connection timeout</td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.httpProxy</td> |
| <td align="right">spring.cloud.kubernetes.client.http-proxy</td> |
| <td align="right"> </td> |
| <td align="right"> </td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.httpsProxy</td> |
| <td align="right">spring.cloud.kubernetes.client.https-proxy</td> |
| <td align="right"> </td> |
| <td align="right"> </td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.loggingInberval</td> |
| <td align="right">spring.cloud.kubernetes.client.loggingInterval</td> |
| <td align="right">20s</td> |
| <td align="right">Logging interval</td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.masterUrl</td> |
| <td align="right">spring.cloud.kubernetes.client.masterUrl</td> |
| <td align="right">kubernetes.default.svc</td> |
| <td align="right">Kubernetes API Master Node URL</td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.namespacce</td> |
| <td align="right">spring.cloud.kubernetes.client.namespace</td> |
| <td align="right">default</td> |
| <td align="right">Kubernetes Namespace</td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.noProxy</td> |
| <td align="right">spring.cloud.kubernetes.client.noProxy</td> |
| <td align="right"> </td> |
| <td align="right"> </td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.password</td> |
| <td align="right">spring.cloud.kubernetes.client.password</td> |
| <td align="right"> </td> |
| <td align="right">Kubernetes API Password</td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.proxyPassword</td> |
| <td align="right">spring.cloud.kubernetes.client.proxyPassword</td> |
| <td align="right"> </td> |
| <td align="right"> </td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.proxyUsername</td> |
| <td align="right">spring.cloud.kubernetes.client.proxyUsername</td> |
| <td align="right"> </td> |
| <td align="right"> </td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.requestTimeout</td> |
| <td align="right">spring.cloud.kubernetes.client.requestTimeout</td> |
| <td align="right">10s</td> |
| <td align="right">Request timeout</td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.rollingTimeout</td> |
| <td align="right">spring.cloud.kubernetes.client.rollingTimeout</td> |
| <td align="right">900s</td> |
| <td align="right">Rolling timeout</td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.trustCerts</td> |
| <td align="right">spring.cloud.kubernetes.client.trustCerts</td> |
| <td align="right">false</td> |
| <td align="right">Kubernetes API Trust Certificates</td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.username</td> |
| <td align="right">spring.cloud.kubernetes.client.username</td> |
| <td align="right"> </td> |
| <td align="right">Kubernetes API Username</td></tr> |
| <tr class="a"> |
| <td align="left">log4j2.kubernetes.client.watchReconnectInterval</td> |
| <td align="right">spring.cloud.kubernetes.client.watchReconnectInterval</td> |
| <td align="right">1s</td> |
| <td align="right">Reconnect Interval</td></tr> |
| <tr class="b"> |
| <td align="left">log4j2.kubernetes.client.watchReconnectLimit</td> |
| <td align="right">spring.cloud.kubernetes.client.watchReconnectLimit</td> |
| <td align="right">-1</td> |
| <td align="right">Reconnect Interval limit retries</td></tr> |
| </tbody> |
| </table></section><section> |
| <h2><a name="Requirements"></a>Requirements</h2> |
| <p>Log4j Kubernetes requires Log4j Core, Log4j API and a minimum of Java 8. |
| For more information, see <a href="runtime-dependencies.html">Runtime Dependencies</a>.</p></section> |
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