Java Web Environment Setup on Enterprise Linux
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Perrequisites
Verify no existing Java installation conflicts:
java -version 2>&1 || echo "Java not detected - proceeding with installation"
Remove MariaDB libraries to prevent MySQL conflicts:
rpm -e --nodeps $(rpm -qa | grep mariadb) 2>/dev/null || true
JDK Configuration
Deploy the JDK to system libraries:
mkdir -p /usr/java
tar -zxf jdk-8u333-linux-x64.tar.gz -C /usr/java/
Persist environment configuration in /etc/profile.d/java.sh:
export JAVA_HOME=/usr/java/jdk1.8.0_333
export PATH=${JAVA_HOME}/bin:${PATH}
export CLASSPATH=.:${JAVA_HOME}/lib
Activate immediately:
source /etc/profile.d/java.sh
Servlet Container Installation
Extract Tomcat to application server directory:
install -d /srv/tomcat
tar -zxf apache-tomcat-9.0.70.tar.gz -C /srv/tomcat/
ln -sf /srv/tomcat/apache-tomcat-9.0.70 /srv/tomcat/current
Configure automatic startup via systemd unit /etc/systemd/system/tomcat.service:
[Unit]
Description=Apache Tomcat Web Application Container
After=network.target
[Service]
Type=forking
Environment="JAVA_HOME=/usr/java/jdk1.8.0_333"
Environment="CATALINA_HOME=/srv/tomcat/current"
Environment="CATALINA_OPTS=-Xms512M -Xmx1024M"
ExecStart=/srv/tomcat/current/bin/startup.sh
ExecStop=/srv/tomcat/current/bin/shutdown.sh
SuccessExitStatus=143
[Install]
WantedBy=multi-user.target
Enable service:
systemctl daemon-reload
systemctl enable --now tomcat
Database Server Configuration
Install prerequisite libraries:
yum install -y libaio numactl
Install MySQL 5.7 packages sequentially:
cd /opt/software/mysql/
rpm -ivh mysql-community-common-5.7.40-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.40-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-5.7.40-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-5.7.40-1.el7.x86_64.rpm
Initialize and secure:
systemctl enable --now mysqld
temp_pass=$(grep 'temporary password' /var/log/mysqld.log | tail -1 | awk '{print $NF}')
mysql -uroot -p"${temp_pass}" --connect-expired-password -e "
SET GLOBAL validate_password_policy=LOW;
SET GLOBAL validate_password_length=6;
ALTER USER 'root'@'localhost' IDENTIFIED BY 'Admin123';
CREATE USER 'devuser'@'%' IDENTIFIED BY 'DevPass123';
GRANT ALL PRIVILEGES ON *.* TO 'devuser'@'%';
FLUSH PRIVILEGES;
"
Network Security Configuration
Configure firewald for application ports:
firewall-cmd --permanent --add-port=8080/tcp --add-port=3306/tcp
firewall-cmd --reload
firewall-cmd --list-ports
Application Publication
Prepare database schema:
mysql -udevuser -pDevPass123 -e "CREATE DATABASE IF NOT EXISTS webapp CHARACTER SET utf8mb4;"
mysql -udevuser -pDevPass123 webapp < /opt/deploy/schema.sql
Deploy web archive:
systemctl stop tomcat
rm -rf /srv/tomcat/current/webapps/ROOT*
cp /opt/deploy/application.war /srv/tomcat/current/webapps/ROOT.war
systemctl start tomcat
