Upgrade Distributed API Server without DB to v5.2

This step is for an API server in a distributed environment that has a separate database server.

Abiquo will upgrade to new versions of RabbitMQ that require a manual upgrade path of dependencies.

1. Remove the Erlang packages

   yum remove erlang*
   yum clean all && yum makecache

2. Install new RabbitMQ

   yum install rabbitmq-server

   Before you confirm, check that the packages will be installed from the abiquo-base repository

   1. rabbitmq-server: 3.8.2.1

3. On the API server, upgrade Abiquo to 5.2.x

   yum update

   Before you confirm, check the following packages will be installed from the abiquo-base repository:

   1. jdk: 11.0.6u10
   2. redis: 5.0.7.1

4. Check versions of Java and Tomcat

    Click here to show/hide steps to check versions

   Check that the symbolic link to the latest version of Java points to Java 11

   # cd /usr/java
   # ll
   latest -> /usr/java/jdk-11.0.6+10

   Check that the correct Tomcat version will be used

   # cd /opt/abiquo/tomcat/bin
   # sh version.sh
   Using CATALINA_BASE:   /opt/abiquo/tomcat
   Using CATALINA_HOME:   /opt/abiquo/tomcat
   Using CATALINA_TMPDIR: /opt/abiquo/tomcat/temp
   Using JRE_HOME:        /usr
   Using CLASSPATH:       /opt/abiquo/tomcat/bin/bootstrap.jar:/opt/abiquo/tomcat/bin/tomcat-juli.jar
   NOTE: Picked up JDK_JAVA_OPTIONS:  --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
   Server version: Apache Tomcat/9.0.33
   Server built:   Mar 11 2020 09:31:38 UTC
   Server number:  9.0.33.0
   OS Name:        Linux
   OS Version:     3.10.0-1160.15.2.el7.x86_64
   Architecture:   amd64
   JVM Version:    11.0.6+10
   JVM Vendor:     AdoptOpenJDK

   On the API Server in the JDK folder, check certificate migration for AM download. The API Server certificate should be listed for Java 11 with its FQDN. You may need to enter the storepass option to supply the password and you can use the alias option to search for the hostname or FQDN of your server

   # cd /usr/java/jdk-11.0.6+10/lib/security
   # keytool -list -keystore cacerts -alias (hostname or fqdn)

   For example

   sudo keytool -list -keystore cacerts -alias abiquo.example.com

5. Enable and start RabbitMQ on the API server

   systemctl enable rabbitmq-server
   systemctl start rabbitmq-server

6. On the API Server, change file permissions so the Abiquo services can run as the tomcat user (not root) and allow access to the configuration files

   chown -R tomcat /opt/abiquo