Day 26: Configuring Memcached & RabbitMQ

In continuation of setting up a complete Java project stack manually using Vagrant-based virtual machines, Day 26 focused on configuring two vital backend services:

• Memcached (Database Caching)

• RabbitMQ (Message Broker)

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🗃️ Memcached Setup (mc01 VM)

Memcached boosts performance by caching database responses.

Steps:

1. SSH into mc01 VM:

    vagrant ssh mc01
    sudo -i
   

2. Update /etc/hosts if needed.

3. Install & configure Memcached:

    yum install memcached -y
    systemctl start memcached
    systemctl enable memcached
    sed -i 's/127.0.0.1/0.0.0.0/g' /etc/sysconfig/memcached
    systemctl restart memcached
   

4. Open firewall ports:

    firewall-cmd --add-port=11211/tcp
    firewall-cmd --runtime-to-permanent
    firewall-cmd --add-port=11111/udp
    firewall-cmd --runtime-to-permanent
   

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📨 RabbitMQ Setup (rmq01 VM)

RabbitMQ acts as a message broker, managing communication between services.

Steps:

1. SSH into rmq01:

    vagrant ssh rmq01
    sudo -i
   

2. Update /etc/hosts and disable SELinux:

    sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
    setenforce 0
   

3. Install Erlang (dependency):

    curl -s https://packagecloud.io/install/repositories/rabbitmq/erlang/script.rpm.sh | bash
    yum clean all
    yum makecache
    yum install erlang -y
   

4. Install RabbitMQ Server:

    curl -s https://packagecloud.io/install/repositories/rabbitmq/rabbitmq-server/script.rpm.sh | bash
    yum install rabbitmq-server -y
    systemctl start rabbitmq-server
    systemctl enable rabbitmq-server
   

5. Configure for remote login & add test user:

    echo "[{rabbit, [{loopback_users, []}]}]." > /etc/rabbitmq/rabbitmq.config
    rabbitmqctl add_user test test
    rabbitmqctl set_user_tags test administrator
   

6. Open ports & restart:

    firewall-cmd --add-port=5671/tcp --permanent
    firewall-cmd --add-port=5672/tcp --permanent
    firewall-cmd --reload
    systemctl restart rabbitmq-server
   

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💡 Takeaway

Both services are now configured and ready to integrate into the application stack!
Stay tuned for Day 27, where we configure Tomcat for deploying the Java WAR file.

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📌 Follow the full DevOps Stack Setup series on Hashnode
🛠️ GitHub Repo: hkhcoder/vprofile-project