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development:grails:grails3applicationguide [2017/05/24 14:50] – Support Page Load-Balancer Set-Up ashevyakovdevelopment:grails:grails3applicationguide [2021/06/25 10:09] (current) – external edit 127.0.0.1
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 +====== Grails 3 Application Guide ======
 +
 +Thanks to Grails 3 is based on Spring Boot, we can use tons of cool feature from Spring Boot and Grails 3 is very friendly to amazing other Spring Frameworks.
 +
 +Document correct on Grails 3.2.6
 +
 +====== Configuration File ======
 +
 +===== User Environment Variable on the server =====
 +Spring Boot inject environment variable when application starts
 +meaning value of SUPPORT_PAGE_JVM_ROUTE in app handler, not one in machine that builds war
 +
 +<code>
 +tomcat:
 +    jvmRoute: ${SUPPORT_PAGE_JVM_ROUTE}
 +</code>
 +
 +===== Access to Variable in application.yml =====
 +User annotation org.springframework.beans.factory.annotation.Value
 +
 +<code>
 +  @Value('${tomcat.jvmRoute}')
 +  String jvmRouteString
 +</code>
 +
 +====== Environment Specific War/Jar ======
 +
 +We can create environment specific War/Jar file.
 +What you need is environment specific application.yml
 +
 +For instance, support page war for errigalqa, you need to create application-errigalqa.yml
 +You don't need to redefine all config values in application.yml, only ones you want to override such as dataSource.
 +
 +To build war, all you need is put **"-Dgrails.env=errigalqa"** before grails command.
 +
 +Benefit of this is very simple deployment. You don't need to put configuration file, tomcat container on deployment server.
 +In practice, you may need startup script that define Environment Variable.
 +
 +Drawback of this are
 +  * multiple different war for each environment
 +  * multiple build process may required for each environment
 +
 +Those drawbacks could be overcome with more automated build process
 +
 +===== Graceful Shutdown =====
 +
 +Do **"kill <pid>"** (no options such as -9) will do graceful shutdown and will call BootStrap.destroy() method.
 +
 +
 +====== Configure Tomcat ======
 +
 +===== Enable JMX and jvmRoute =====
 +
 +Part of Application.yml
 +
 +<code>
 +---
 +tomcat:
 +    ajp:
 +        port: 8018
 +        remoteauthentication: false
 +        enabled: true
 +    # Environment Variable will be loaded when application starts, i.e. at app handler
 +    jvmRoute: ${SUPPORT_PAGE_JVM_ROUTE}
 +</code>
 +
 +Configuration Bean for Tomcat
 +
 +<code>
 +package com.errigal.support.page.systemconfig
 +
 +import org.apache.catalina.connector.Connector
 +import org.springframework.beans.factory.annotation.Value
 +import org.springframework.boot.context.embedded.EmbeddedServletContainerFactory
 +import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory
 +import org.springframework.boot.context.properties.ConfigurationProperties
 +import org.springframework.context.annotation.Bean
 +import org.springframework.context.annotation.Configuration
 +/***************************************************************
 + * Copyright (c) 2017 Errigal Inc.
 + *
 + * This software is the confidential and proprietary information
 + * of Errigal, Inc.  You shall not disclose such confidential
 + * information and shall use it only in accordance with the
 + * license agreement you entered into with Errigal.
 + *
 + ***************************************************************/
 +
 +/**
 + * Start AJP for load balancer
 + * https://docs.spring.io/spring-boot/docs/current/reference/html/howto-embedded-servlet-containers.html
 + * https://blog.swdev.ed.ac.uk/2015/06/24/adding-embedded-tomcat-ajp-support-to-a-spring-boot-application/
 + * https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html
 + *
 + * @ConfigurationProperties this let this class only load property with prefix tomcat
 + *
 + * User: wonlee
 + * Date: 15/03/2017
 + */
 +@Configuration
 +@ConfigurationProperties(prefix = "tomcat")
 +class TomcatConfiguration {
 +  @Value('${tomcat.ajp.port}')
 +  int ajpPort
 +
 +  @Value('${tomcat.ajp.remoteauthentication}')
 +  String remoteAuthentication
 +
 +  @Value('${tomcat.ajp.enabled}')
 +  boolean tomcatAjpEnabled
 +
 +  @Value('${tomcat.jvmRoute}')
 +  String jvmRouteString
 +
 +  @Bean
 +  public EmbeddedServletContainerFactory tomcatEmbeddedServletContainerFactory() {
 +    TomcatEmbeddedServletContainerFactory tomcat = new TomcatEmbeddedServletContainerFactory()
 +    if (tomcatAjpEnabled) {
 +      Connector ajpConnector = new Connector("AJP/1.3")
 +      ajpConnector.setProtocol("AJP/1.3")
 +      ajpConnector.setPort(ajpPort)
 +      ajpConnector.setSecure(false)
 +      ajpConnector.setAllowTrace(false)
 +      ajpConnector.setScheme("http")
 +      tomcat.addAdditionalTomcatConnectors(ajpConnector)
 +    }
 +
 +    /*
 +     * Set jvmRoute which is required by jk_mod (load balancer)
 +     * http://stackoverflow.com/questions/31166336/how-to-set-embedded-tomcat-jvmroute
 +     *
 +     * Tomcat uses System Property to set jvmRoute
 +     * https://tomcat.apache.org/tomcat-8.5-doc/config/systemprops.html
 +     *
 +     * jvmRoute won't be added to cookie name if it is empty string
 +     */
 +    System.setProperty("jvmRoute", jvmRouteString)
 +
 +    return tomcat
 +  }
 +}
 +</code>
 +
 +====== Single Sign On ======
 +[[development:applications:singlesignon#integrate_single_sing_on_in_grails_3|Integrate Single Sing on in Grails 3]]
 +
 +====== Load-balancer Set-Up (support_page example) ======
 +<code>
 +on: EXTLB - Prepare new Load Balancer setting
 +cd /etc/httpd/conf
 +sudo cp mod-jk.conf mod-jk.conf.bk
 +sudo vi mod-jk.conf.bk
 +Append following lines at the end
 +JkMount /Support/ SupportPageLoadBalancer
 +JkMount /Support/* SupportPageLoadBalancer
 +JkMount /Support SupportPageLoadBalancer
 +sudo cp workers.properties workers.properties.bk 
 +sudo vi workers.properties.bk
 +Line2, at the end of  "worker.list=", add "SupportPageLoadBalancer" to the list
 +So the line has to look like
 +worker.list=jkstatus,NocPortalLoadBalancer,SnmpManagerLoadBalancer,SnmpManagerEMSLoadBalancer,ReportingManagerLoadBalancer,TicketerLoadBalancer,CasLoadBalancer,SoapLoadBalancer,SupportPageLoadBalancer 
 +Add following line after Soap Worker Config lines
 +# Configure SupportPage
 +worker.SupportPageLoadBalancer.type=lb
 +worker.SupportPageLoadBalancer.sticky_session=1
 +
 +worker.SupportPageWorker1.reference=worker.ajptemplate
 +worker.SupportPageWorker1.host=extapps1.ext
 +worker.SupportPageWorker1.port=8018
 +worker.SupportPageWorker1.reply_timeout=600000
 +
 +worker.SupportPageWorker2.reference=worker.ajptemplate
 +worker.SupportPageWorker2.host=extapps2.ext
 +worker.SupportPageWorker2.port=8018
 +
 +worker.SupportPageWorker2.reply_timeout=600000
 +Append following lines at the end
 +worker.SupportPageLoadBalancer.balance_workers=SupportPageWorker1,SupportPageWorker2
 +</code>
 +
 +Do restart the HTTPD: sudo service httpd restart
 +
 +<code>
 + Setup SSO for Support Page
 +APPS1 & APPS2
 +cd /usr/local/conf/cas/services/
 +touch support_page-1008.json
 +vi support_page-1008.json
 +{
 +        "@class" : "org.jasig.cas.services.RegexRegisteredService",
 +          "serviceId" : "https://nocportal.extenetsystems.com/Support/.*",
 +          "name" : "Support Page",
 +          "id" : 1008
 +}
 +Change will be applied automatically to CAS
 +</code>
  

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