This guide explains how to use NFS on CentOS to synchronize data between multiple web servers and implement load balancing, covering NFS service basics, configuration files, export options, related commands, DNS setup, shared directory creation, Apache virtual host configuration, and testing the synchronized WordPress site.
The article examines the progressive evolution of image server architectures—from early NFS‑based setups through distributed storage with load balancing and caching, to modern cloud‑based solutions like Alibaba OSS—highlighting design considerations, performance trade‑offs, and implementation details for scalable, high‑availability image services.
This article explains Hadoop 2.0's High Availability architecture, comparing the NFS and Quorum Journal Manager methods, detailing their principles, failover mechanisms, and practical tips for reliable NameNode redundancy in big‑data deployments.
The article outlines a Linux server architecture that mounts a read‑only root filesystem over the network from a centrally managed, DRBD‑replicated control node with Heartbeat failover, providing real‑time updates, high security (even root cannot modify), and automatic migration via virtual IP.
