On 1st RHEL machine
*****************************************************
JAVA Installation:--
sudo yum install java-1.8.0-openjdk-devel -y
sudo yum install wget -y

Tomcat Installation:--
sudo wget https://mirrors.estointernet.in/apache/tomcat/tomcat-9/v9.0.45/bin/apache-tomcat-9.0.45.tar.gz
sudo tar -zxvf apache-tomcat-9.0.45.tar.gz
sudo mv apache-tomcat-9.0.45 /opt/Tomcat/
cd /opt/Tomcat/bin/
./startup.sh
http://my-ip-address:8080/

Openmrs war (deploy):--
cd /opt/Tomcat/webapps/
sudo wget https://sourceforge.net/projects/openmrs/files/releases/OpenMRS_Platform_2.4.0/openmrs.war 

Restart tomcat service
http://my-ip-address:8080/openmrs
-------------------------------------------------------------------------------------------------------------
On same machine (1st RHEL machine), I installed MySQL
*****************************************************
MYSQL Installation:--

sudo wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
sudo rpm -ivh mysql57-community-release-el7-11.noarch.rpm
sudo yum install -y mysql-server
sudo systemctl status mysqld
sudo systemctl start mysqld

mysql_secure_installation

#############################################################

Press y|Y for Yes, any other key for No: y
Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG: 1

Please set the password for root here.
New password: <my-password>
Re-enter new password: <my-password>

Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y
Remove anonymous users? (Press y|Y for Yes, any other key for No) : y
Disallow root login remotely? (Press y|Y for Yes, any other key for No) : n
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : n
Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y

#############################################################

mysql -u root -p
Enter password: <my-password>

GRANT ALL ON root.* TO root@localhost WITH GRANT OPTION;
FLUSH PRIVILEGES;
exit
sudo systemctl restart mysqld
sudo systemctl status mysqld
-------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------