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| --> |
| <h1>YARN Service Examples</h1> |
| <p>This document describes some example service definitions (<tt>Yarnfile</tt>).</p> |
| <ul> |
| <li><a href="#Apache_web_server_-_httpd_.28with_registry_DNS.29">Apache web server - httpd (with registry DNS)</a></li> |
| <li><a href="#Apache_web_server_-_httpd_.28without_registry_DNS.29">Apache web server - httpd (without registry DNS)</a></li> |
| <li><a href="#Application_Catalog_-_appcatalog">Application Catalog - appcatalog</a></li> |
| <li><a href="#Docker_image_ENTRYPOINT_support">Docker image ENTRYPOINT support</a></li></ul> |
| |
| <div class="section"> |
| <h2><a name="Apache_web_server_-_httpd_.28with_registry_DNS.29"></a>Apache web server - httpd (with registry DNS)</h2> |
| <p>For this example to work, centos/httpd-24-centos7 image must be included in <tt>docker.trusted.registries</tt>. For server side configuration, please refer to <a href="../DockerContainers.html">Running Applications in Docker Containers</a> document.</p> |
| <p>Below is the <tt>Yarnfile</tt> for a service called <tt>httpd-service</tt> with two <tt>httpd</tt> instances. There is also an httpd proxy instance (httpd-proxy-0) that proxies between the other two httpd instances (httpd-0 and httpd-1).</p> |
| <p>Note this example requires registry DNS.</p> |
| |
| <div> |
| <div> |
| <pre class="source">{ |
| "name": "httpd-service", |
| "version": "1.0", |
| "lifetime": "3600", |
| "components": [ |
| { |
| "name": "httpd", |
| "number_of_containers": 2, |
| "artifact": { |
| "id": "centos/httpd-24-centos7:latest", |
| "type": "DOCKER" |
| }, |
| "launch_command": "/usr/bin/run-httpd", |
| "resource": { |
| "cpus": 1, |
| "memory": "1024" |
| }, |
| "configuration": { |
| "files": [ |
| { |
| "type": "TEMPLATE", |
| "dest_file": "/var/www/html/index.html", |
| "properties": { |
| "content": "<html><header><title>Title</title></header><body>Hello from ${COMPONENT_INSTANCE_NAME}!</body></html>" |
| } |
| } |
| ] |
| } |
| }, |
| { |
| "name": "httpd-proxy", |
| "number_of_containers": 1, |
| "artifact": { |
| "id": "centos/httpd-24-centos7:latest", |
| "type": "DOCKER" |
| }, |
| "launch_command": "/usr/bin/run-httpd", |
| "resource": { |
| "cpus": 1, |
| "memory": "1024" |
| }, |
| "configuration": { |
| "files": [ |
| { |
| "type": "TEMPLATE", |
| "dest_file": "/etc/httpd/conf.d/httpd-proxy.conf", |
| "src_file": "httpd-proxy.conf" |
| } |
| ] |
| } |
| } |
| ], |
| "quicklinks": { |
| "Apache HTTP Server": "http://httpd-proxy-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080" |
| } |
| } |
| </pre></div></div> |
| |
| <p>This <tt>Yarnfile</tt> is already included in the Hadoop distribution, along with the required configuration template <tt>httpd-proxy.conf</tt>. First upload the configuration template file to HDFS:</p> |
| |
| <div> |
| <div> |
| <pre class="source">hdfs dfs -copyFromLocal ${HADOOP_YARN_HOME}/share/hadoop/yarn/yarn-service-examples/httpd/httpd-proxy.conf . |
| </pre></div></div> |
| |
| <p>The proxy configuration template looks like the following and will configure the httpd-proxy-0 container to balance between the httpd-0 and httpd-1 containers evenly:</p> |
| |
| <div> |
| <div> |
| <pre class="source"><Proxy balancer://test> |
| BalancerMember http://httpd-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080 |
| BalancerMember http://httpd-1.${SERVICE_NAME}.${USER}.${DOMAIN}:8080 |
| ProxySet lbmethod=bytraffic |
| </Proxy> |
| |
| ProxyPass "/" "balancer://test/" |
| ProxyPassReverse "/" "balancer://test/" |
| </pre></div></div> |
| |
| <p>Then run the service with the command:</p> |
| |
| <div> |
| <div> |
| <pre class="source">yarn app -launch <service-name> httpd |
| </pre></div></div> |
| |
| <p>The last argument is either the path to a JSON specification of the service, or in this case, the name of an example service. The directory where examples can be found can be configured by setting the YARN_EXAMPLES_DIR environment variable.</p> |
| <p>Once the service is running, navigate to <tt>http://httpd-proxy-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080</tt> to see the root page. The pages should alternately show “Hello from httpd-0!” or “Hello from httpd-1!”</p> |
| <p>The individual httpd URLs can also be visited, <tt>http://httpd-0.${SERVICE_NAME}.${USER}.${DOMAIN}:8080</tt> and <tt>http://httpd-1.${SERVICE_NAME}.${USER}.${DOMAIN}:8080</tt>.</p> |
| <p>If unsure of your hostnames, visit the RM REST endpoint <tt>http://<RM host>:8088/app/v1/services/httpd-service</tt>.</p></div> |
| <div class="section"> |
| <h2><a name="Apache_web_server_-_httpd_.28without_registry_DNS.29"></a>Apache web server - httpd (without registry DNS)</h2> |
| <p>A similar IP-based example is provided for environments that do not have registry DNS set up. The service name for this example is <tt>httpd-service-no-dns</tt>. There are a couple of additions to the <tt>Yarnfile</tt> for the <tt>httpd-service</tt> described above. A readiness check is added for the <tt>httpd</tt> component:</p> |
| |
| <div> |
| <div> |
| <pre class="source"> "readiness_check": { |
| "type": "HTTP", |
| "properties": { |
| "url": "http://${THIS_HOST}:8080" |
| } |
| }, |
| </pre></div></div> |
| |
| <p>and <tt>httpd</tt> is added as a dependency for the <tt>httpd-proxy</tt> component:</p> |
| |
| <div> |
| <div> |
| <pre class="source"> "dependencies": [ "httpd" ], |
| </pre></div></div> |
| |
| <p>This means that the httpd-proxy-0 instance will not be started until after an HTTP probe has succeeded for the httpd-0 and httpd-1 containers. This is necessary so that the IPs of the containers can be used in the configuration of httpd-proxy-0. The proxy configuration is similar to that of the previous example, with the BalancerMember lines changed as follows:</p> |
| |
| <div> |
| <div> |
| <pre class="source"> BalancerMember http://${HTTPD-0_IP}:8080 |
| BalancerMember http://${HTTPD-1_IP}:8080 |
| </pre></div></div> |
| |
| <p>Note that IP and HOST variables such as <tt>${HTTPD-0_IP}</tt> and <tt>${HTTPD-0_HOST}</tt> should only be used by a component that has a dependency on the named component (<tt>httpd</tt> in this case) AND should only be used when the named component specifies a readiness check. Here, <tt>httpd-proxy</tt> has a dependency on <tt>httpd</tt> and <tt>httpd</tt> has an HTTP readiness check. Without the dependency and readiness check, the httpd-proxy-0 container would be started in parallel with the httpd-0 and http-1 containers, and the IPs and hosts would not be assigned yet for httpd-0 and httpd-1.</p> |
| <p>Other variables can be used by any component.</p> |
| <p>Before creating the service, upload the proxy configuration to HDFS:</p> |
| |
| <div> |
| <div> |
| <pre class="source">hdfs dfs -copyFromLocal ${HADOOP_YARN_HOME}/share/hadoop/yarn/yarn-service-examples/httpd-no-dns/httpd-proxy-no-dns.conf . |
| </pre></div></div> |
| |
| <p>Then run the service with the command:</p> |
| |
| <div> |
| <div> |
| <pre class="source">yarn app -launch <service-name> httpd-no-dns |
| </pre></div></div> |
| |
| <p>where <tt>service-name</tt> is optional. If omitted, it uses the name defined in the <tt>Yarnfile</tt>.</p> |
| <p>Look up your IPs at the RM REST endpoint <tt>http://<RM host>:8088/app/v1/services/httpd-service</tt>. Then visit port 8080 for each IP to view the pages.</p></div> |
| <div class="section"> |
| <h2><a name="Application_Catalog_-_appcatalog"></a>Application Catalog - appcatalog</h2> |
| <p>Application Catalog introduces many exciting new features for deploying Hadoop software that benefit both administrators and end users. With Application Catalog, user gets a personalized view of the software status in Hadoop. In addition, users can install or register applications by using web-based user interface.</p> |
| <p>To start Application Catalog service with the command:</p> |
| |
| <div> |
| <div> |
| <pre class="source">yarn app -launch <service-name> appcatalog |
| </pre></div></div> |
| |
| <p>where <tt>service-name</tt> is user defined name.</p> |
| <p>The deployment progress of the application catalog is located in Resource Manager UI. When the service reaches STABLE state, application catalog UI is available at: <a class="externalLink" href="http://appcatalog.${SERVICE_NAME}.${USER}.${DOMAIN}:8080/">http://appcatalog.${SERVICE_NAME}.${USER}.${DOMAIN}:8080/</a></p> |
| <p>For secure cluster, Kerberos settings for application catalog can be configured in Yarn service JSON using environment variable settings:</p> |
| <table border="0" class="bodyTable"> |
| <thead> |
| |
| <tr class="a"> |
| <th align="left"> Environment Variable </th> |
| <th align="left"> Example </th> |
| <th align="left"> Description </th></tr> |
| </thead><tbody> |
| |
| <tr class="b"> |
| <td align="left"> YARN_CONTAINER_RUNTIME_DOCKER_MOUNTS </td> |
| <td align="left"> /etc/hadoop/conf:/etc/hadoop/conf:ro,/etc/krb5.conf:/etc/krb5.conf:ro,/etc/security/keytabs/yarn.service.keytab:/etc/security/keytabs/yarn.service.keytab:ro,/etc/security/keytabs/spnego.service.keytab:/etc/security/keytabs/spnego.service.keytab:ro </td> |
| <td align="left"> Container mount path for Hadoop configuration, Kerberos krb5.conf, and list of Kerberos keytab files. </td></tr> |
| <tr class="a"> |
| <td align="left"> SPNEGO_KEYTAB </td> |
| <td align="left"> /etc/security/keytabs/spnego.service.keytab </td> |
| <td align="left"> Service principal for Application catalog. </td></tr> |
| <tr class="b"> |
| <td align="left"> SPNEGO_PRINCIPAL </td> |
| <td align="left"> <a class="externalLink" href="mailto:HTTP/appcatalog.catalog.yarn.example.com@EXAMPLE.COM">HTTP/appcatalog.catalog.yarn.example.com@EXAMPLE.COM</a> </td> |
| <td align="left"> Service principal for Application catalog. </td></tr> |
| <tr class="a"> |
| <td align="left"> KEYTAB </td> |
| <td align="left"> /etc/security/keytabs/yarn.service.ketab </td> |
| <td align="left"> Path to keytab file, used by YARN service application master. </td></tr> |
| <tr class="b"> |
| <td align="left"> PRINCIPAL </td> |
| <td align="left"> <a class="externalLink" href="mailto:yarn/_HOST@EXAMPLE.COM">yarn/_HOST@EXAMPLE.COM</a> </td> |
| <td align="left"> Service principal used by YARN service application master. </td></tr> |
| </tbody> |
| </table> |
| <p>Application Catalog environment options:</p> |
| <p>| Environment variables | Description | | KEYTAB | Service user keytab file for accessing HDFS. | | PRINCIPAL | Service user Kerboers principal. | | SOLR_DATA_DIR | Location to store Solr data. | | SOLR_STORAGE_TYPE | Storage type for Solr data, supported type are: hdfs, local | | SPNEGO_KEYTAB | Location of the keytab file used for authenticating HTTP endpoint. | | SPNEGO_PRINCIPAL | The Kerberos principal to be used for HTTP endpoint. The principal MUST start with ‘HTTP’/ as per Kerberos HTTP SPNEGO specification. |</p> |
| <p>Secure application catalog Yarnfile example:</p> |
| |
| <div> |
| <div> |
| <pre class="source">{ |
| "name": "catalog", |
| "kerberos_principal" : { |
| "principal_name" : "catalog/_HOST@EXAMPLE.COM", |
| "keytab" : "file:///etc/security/keytabs/catalog.service.keytab" |
| }, |
| "version": "1", |
| "components" : |
| [ |
| { |
| "name": "appcatalog", |
| "number_of_containers": 1, |
| "artifact": { |
| "id": "apache/hadoop-yarn-applications-catalog-docker:3.3.0-SNAPSHOT", |
| "type": "DOCKER" |
| }, |
| "resource": { |
| "cpus": 1, |
| "memory": "256" |
| }, |
| "configuration": { |
| "env": { |
| "YARN_CONTAINER_RUNTIME_DOCKER_RUN_OVERRIDE_DISABLE":"true", |
| "YARN_CONTAINER_RUNTIME_DOCKER_MOUNTS":"/etc/hadoop/conf:/etc/hadoop/conf:ro,/etc/krb5.conf:/etc/krb5.conf:ro,/etc/security/keytabs/catalog.service.keytab:/etc/security/keytabs/hbase.service.keytab:ro,/etc/security/keytabs/spnego.service.keytab:/etc/security/keytabs/spnego.service.keytab:ro", |
| "SPNEGO_KEYTAB":"/etc/security/keytabs/spnego.service.keytab", |
| "SPNEGO_PRINCIPAL":"HTTP/host-3.example.com@EXAMPLE.COM", |
| "KEYTAB":"/etc/security/keytabs/catalog.service.keytab", |
| "PRINCIPAL":"catalog/host3.example.com@EXAMPLE.COM", |
| "SOLR_DATA_DIR":"hdfs://host-1.example.com:9000/tmp/solr", |
| "SOLR_UPDATE_LOG":"hdfs://host-1.example.com:9000/tmp/solr", |
| "SOLR_STORAGE_TYPE":"hdfs" |
| }, |
| "properties": { |
| "docker.network": "host" |
| } |
| } |
| } |
| ] |
| } |
| |
| </pre></div></div> |
| </div> |
| <div class="section"> |
| <h2><a name="Docker_image_ENTRYPOINT_support"></a>Docker image ENTRYPOINT support</h2> |
| <p>Docker images may have built with ENTRYPOINT to enable start up of docker image without any parameters. When passing parameters to ENTRYPOINT enabled image, <tt>launch_command</tt> is delimited by comma (,).</p> |
| |
| <div> |
| <div> |
| <pre class="source">{ |
| "name": "sleeper-service", |
| "version": "1.0", |
| "components" : |
| [ |
| { |
| "name": "sleeper", |
| "number_of_containers": 2, |
| "artifact": { |
| "id": "hadoop/centos:latest", |
| "type": "DOCKER" |
| }, |
| "launch_command": "sleep,90000", |
| "resource": { |
| "cpus": 1, |
| "memory": "256" |
| }, |
| "restart_policy": "ON_FAILURE", |
| "configuration": { |
| "env": { |
| "YARN_CONTAINER_RUNTIME_DOCKER_RUN_OVERRIDE_DISABLE":"true" |
| }, |
| "properties": { |
| "docker.network": "host" |
| } |
| } |
| } |
| ] |
| } |
| </pre></div></div></div> |
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