Install WSO2 Identity Server 5.7.0 on Centos 7 x64

Pre-requisites:
OpenJDK8 or Oracle JDK 1.8.*

Steps:
1. Download WSO2 Identity Server from WSO2 Website:

https://wso2.com/identity-and-access-management/install/

2. Install WSO2 Identity Server

rpm -i wso2is-linux-installer-x64-5.7.0.rpm

3. Download and install Apache Tomcat version 8 or above
I installed Apache Tomcat 9 which I downloaded from Apache Tomcat 9 Core Download (tar.gz)

tar xvf apache-tomcat-9.0.14.tar.gz

4. Download and install curl
I installed it using yum

yum -y install curl

5. Create a Twitter application to try out multi-factor or federated authentication
a. Go to https://twitter.com/ and create an account
b. Register for Twitter Developer account

I applied for it on 31 Jan 2019 6.00pm GMT+8.  Will update here when it is approved).

Update: My Twitter Developer Account was approved 1 Feb 2019 11.43pm GMT+8.  Twitter first responded asking for more info on 31 Jan 2019 10.24pm GMT+8 but I didn't notice the email and only replied back on 1 Feb 2019 11.25pm GMT+8.  So, it's either I was very lucky to have gotten a very fast response or Twitter is super efficient in handling these developer accounts application because I think there would be like thousands of application per day from all over the world everyday!  Anyway, thanks to Twitter for approving my developer account.)

c. Register a new application on Twitter at https://apps.twitter.com You can use the following url as the Callback URL for your Twitter application: https://localhost:9443/commonauth

d. Note down API key and secret for later use.

6. Open the /etc/hosts file and add the following entry
127.0.0.1     localhost.com

7. Start WSO2 IS

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-1.el7_6.x86_64/jre/
export WSO2IS_HOME=/usr/lib64/wso2/wso2is/5.7.0/

cd $WSO2IS_HOME/bin
sudo ./wso2server.sh

8. Open firewall port if firewalld is active in Centos 7

firewall-cmd --permanent --add-port=9443/tcp
firewall-cmd --list-ports

List the services that are accepted through the firewall:
firewall-cmd --list-services