MultiCloud Classroom notes 11/mar/2026

Follow class recording to create vmss

Task:

1. create VM and install apache tomcat 10 (check status tomcat)
2. create image with name apache-tomcat , 10.0.0 version delete vm
3. vmss creation:
   • image : apache-tomcat
   • security rules:
     • 8080
     • 22
     • 443
   • create loadbalancer
   • enable auto scaling
     • min 2 vms
     • max 3 vms
   • create rule for autoscalling

#!/bin/bash

# Update system packages
sudo apt update -y

# Install Java (Tomcat requires Java)
sudo apt install -y default-jdk

# Set Tomcat version
TOMCAT_VERSION=10.1.52
TOMCAT_DIR=/opt/tomcat

# Download Tomcat
wget https://dlcdn.apache.org/tomcat/tomcat-10/v$TOMCAT_VERSION/bin/apache-tomcat-$TOMCAT_VERSION.tar.gz -P /tmp
# Create Tomcat directory
sudo mkdir -p $TOMCAT_DIR

# Extract Tomcat
sudo tar -xvzf /tmp/apache-tomcat-$TOMCAT_VERSION.tar.gz -C $TOMCAT_DIR --strip-components=1

# Set permissions
sudo chown -R $USER:$USER $TOMCAT_DIR
sudo chmod +x $TOMCAT_DIR/bin/*.sh

# Create systemd service file
sudo tee /etc/systemd/system/tomcat.service > /dev/null <<EOF
[Unit]
Description=Apache Tomcat Web Application Container
After=network.target

[Service]
Type=forking

Environment=JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
Environment=CATALINA_PID=$TOMCAT_DIR/temp/tomcat.pid
Environment=CATALINA_HOME=$TOMCAT_DIR
Environment=CATALINA_BASE=$TOMCAT_DIR
Environment='CATALINA_OPTS=-Xms512M -Xmx1024M -server -XX:+UseParallelGC'
Environment='JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom'

ExecStart=$TOMCAT_DIR/bin/startup.sh
ExecStop=$TOMCAT_DIR/bin/shutdown.sh

User=$USER
Group=$USER
Restart=always

[Install]
WantedBy=multi-user.target
EOF

# Reload systemd and enable Tomcat
sudo systemctl daemon-reload
sudo systemctl enable tomcat
sudo systemctl start tomcat

# Print status
sudo systemctl status tomcat --no-pager
echo "Tomcat installation completed. Access it at http://localhost:8080"

test VMSS by execute below cmds

#!/bin/bash

sudo apt update && sudo apt install stress -y 

while true; do
  stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 60s -v
  sleep 30s
done