Simple Notification Service vs Simple Queue Service
The choice between SQS and SNS depends on your specific needs. Decide based on the nature of the message delivery, guarantee of delivery.
Simple Notification Service (SNS)
Unlike SQS, SNS shines in broadcasting messages. Imagine a town crier: SNS publishes messages to "topics" (town squares), and any subscribed "subscribers" (residents) receive copies (hear the message). Perfect for mass notifications like emails, SMS, or app pushes. While delivery isn't 100% guaranteed (unlike SQS), it's ideal for event-driven messaging, spreading the news when something happens.
Simple Queue Service (SQS)
Cloud services offer a vast menu of tools, like messaging platforms. These platforms enable apps to chat asynchronously, ensuring messages get delivered even if the recipient is offline. This frees developers to focus on core logic, leaving the communication infrastructure to the service. Popular examples include SQS and SNS by AWS, and Service Bus by Azure. SQS, a messaging queue, buffers messages and delivers them in the order they were sent, prioritizing reliability with features like retries and dedicated queues for undeliverable messages. If you need ordered or guaranteed delivery, SQS is a strong choice.
Web defacement attack – Symptoms & Remediation
Website defacement changes website content by hackers. Monitor 10 signs like DNS change, suspicious links, and new iframes. Take down the site, change passwords, investigate the attack, and restore from backup. Fix security weaknesses and improve practices to prevent future attacks. Remember regular backups and patching!
How to add a cron job in Linux?
Every day we perform chronic tasks, akin to Unix Cron jobs that automate recurring tasks on a schedule. Users define jobs in a 'crontab' with a specific syntax, utilizing special characters for precise timing. An example job to run hourly is "0 * * * * /opt/aggregator/job.sh". To add a job, edit 'cronjob1' with a text editor, then load it using 'crontab cronjob1'. Verify it with 'crontab -l'. Monitoring cron jobs is crucial for SREs, a topic for a future post.
Inserting custom code to WordPress Header/Footer
Inserting code into WordPress headers/footers requires caution due to security risks. Legitimate reasons include tracking, ads, and SEO. Direct PHP edits are risky; using compatible plugins is safer. WPCode can insert code without manual theme edits. Ensure compatibility with WordPress versions and maintain updates. The WPCode plugin simplifies this process. Compatibility with WordPress 6.4.3 and eG Innovations 7.2.
Removing Amazon LightSail VMs properly without billing leakage
Creating and tearing down a Virtual Private Server on Amazon LightSail involves not only the server but also its related resources like public IP, DNS zones, containers, storages, and databases to avoid additional charges. Users should methodically delete instances, containers, databases, static IP, and DNS zones to prevent unexpected costs and clean up the environment.
How to access JMX port of Docker container from outside?
JMX is a Java API for managing Java applications, used for monitoring and performance control. The post details steps to containerize a Spring Boot application including setting up the JMX port within a Docker container. Additional parameters in `Dockerfile` and `management.properties` are provided, and instructions are given for building the image, running the container, exposing ports via the Linux firewall, and connecting with JMX clients, with a note that while the web port is accessible, JMX client connection issues are pending resolution.
3 Steps to containerize your Spring Boot Application
Spring Boot's popularity stems from its ease of creating standalone, production-ready applications and its support for container environments, featuring auto-configuration and embedded web servers. Moreover, a large developer community offers support. The post demonstrates containerizing a simple Spring Boot app using Docker in three steps: creating a Dockerfile, building a Docker image, and running a Docker container. The process includes setting up the Java environment, exposing ports, and specifying runtime commands. The successful deployment allows access to the application via port mapping between the host and the container.
Docker installation on Linux
Docker is a platform that uses containers to streamline app development and deployment. This guide details Docker installation on Linux, comparing containerization to KVM, a full virtualization solution. While Docker Desktop requires KVM, Docker CE on servers does not. The tutorial concludes by demonstrating a successful Docker installation with a 'hello-world' test.