1. A yum repository can have multiple configurations. Under the directory /etc/yum.repos.d/, there are multiple files ending with *.repo. They can also be integrated into a single file (but I think keeping them separate is better, as you can choose which file to use for updates, and the source of the software packages can be seen from the yum update command). 2. yum repositor …
Testing yum -y upgrade and yum -y update Separately
Before Upgrade
System Version: centos5.5
Kernel Version: 2.6.18-194.el5
Minor configuration file modifications were made before upgrading
yum -y upgrade After Upgrade
System Version: centos5.7
…
Before clearing the memory, let’s check the memory usage with the command: free -m. Then use the memory clearing command: echo 1 > /proc/sys/vm/drop_caches. After running the clearing command, you can then use the check command again: free -m, to see if a lot of memory has been freed. The ps aux results, sorted by memory usage, …
I鈥檝e been wanting to write a blog post about the responsibilities of an Internet DBA for a long time, but struggled to find the time while busy building out platforms. Recently, as each module has begun to take shape, I finally have a moment to settle down and share some insights.
As is widely known, Internet DBAs differ significantly from DBAs in traditional industries, and a key distinction lies in the number of machines they manage …
In the Linux world, if you don’t work with the command line, you’d probably feel too embarrassed to greet your peers. Servers are typically hosted remotely, and you generally log in via SSH—people who rely on remote desktops are a rare sight. This article covers commonly used commands on Linux servers. 1、View local …
Today, let’s take a detailed look at the pros and cons of our old friend Apache and our new friend Nginx, and see which one suits your needs better based on their strengths. First, let’s talk about our old friend Apache. Apache HTTP Server (Apache for short) …
In the “big data” era, we often encounter large text files (GB-sized or larger). Suppose we need to manually search and edit these massive files, or manually analyze multiple GB-sized log files to troubleshoot specific issues. Traditional text editing software for …
SPDY is an application-layer protocol developed by Google based on the Transmission Control Protocol (TCP) (pronounced “speedy”), designed to minimize network latency, improve network speed, and optimize the user’s web experience. SPDY is not a replacement for HTTP, but rather an enhancement to the HTTP protocol. The new protocol …
Finally got a smartphone and laptop, but no Wi-Fi? Dreaming of surfing the web from the comfort of your bed? A wireless router has become an essential household device, but figuring out how to connect it to the network has become a major headache for many …
As enterprise LAN management becomes increasingly demanding, administrators face growing workloads and must leverage network devices to strengthen LAN security. Are network admins truly maximizing the functionality of the routers we rely on every day? Below, we introduce routing…
