The 80/20 ratio in sysadmin and DevOps refers to the principle that 80% of the tasks in system administration can be automated using DevOps practices, allowing administrators to focus on the remaining 20% that require human intervention, such as complex problem-solving and strategic planning. Common cluster admin tasks often include: 1. **Deployment and Scaling:** Deploying applications, services, and updates to the cluster, and scaling them based on demand. 2. **Monitoring and Logging:** Monitoring cluster health, resource usage, and application performance. Collecting and analyzing logs for troubleshooting and optimization. 3. **Security:** Managing access control, implementing security policies, and ensuring data encryption within the cluster. 4. **Backup and Recovery:** Creating backup strategies, performing regular backups, and establishing disaster recovery plans. 5. **Networking:** Configuring network settings, load balancing, and managing DNS for seamless communication between ...