Immutable infrastructure delivers scalability and performance by allowing horizontal scaling of your infrastructure. One of the challenges of adding and removing nodes from a running cluster is making sure that every node has the correct and identical configuration. It is possible to manage a 10-node cluster when you log in and hand-configure each node, but it is toilsome and prone to error. It is silly to hand-administer 100 nodes, and with 1,000 nodes or more, it becomes literally impossible for one person if they have to spend more than 10 minutes per machine per week. In the face of such toil, organizations turn to a configuration management tool to handle large clusters of servers. Chef and Puppet are two of the more popular choi...
Manually operation vs Automatic operation. The core challenge is the maximum of manual operation you can afford.
Share this highlighthttp://www.safaribooksonline.com/a/seeking-sre/19244141/