1. Often, when you need to step away from your desk for other tasks, if you care about your computer’s security, just hold down the Windows key and press the L key. This locks the screen instantly, so you won’t have to worry about your data being exposed.
2. When searching for files on your computer, most people first locate “My Computer&rd …
Linux (CentOS 6.x) Installation:
1. yum install gcc 2. cd /tmp3. wget http://www.monkey.org/~provos/libevent-2.0.4-alpha.tar.gz Note: memcached uses the libevent library for Socket handling, so you also need to install li …
su
# is the superuser prompt
$ is the regular user prompt
centos
Run the following command: yum -y install gcc …
ps -aux toppstree…1. Top First Five Lines of System Summary Statistics The first five lines in the statistics area display overall system statistics. 1. The first line shows task queue information, identical to the output of the `uptime` command: [root@localhost ~]# uptime 13:22:30 up 8 min, 4 users, load av …
Are you planning to switch from Windows to Linux, or have you just made the switch? Oops!!! What am I saying — whatever reason brought you into my world. From my past experience, when I first started using Linux, commands, terminals and all that really scared me. I worried about how many commands I needed to remember to help me…
Servers often need to keep certain files or directories in sync, such as large software download websites that typically use multiple servers to provide download services. When a file is updated on one server, the other servers also need to be updated, and the update should only apply to newly added or modif …
Before describing the implementation principles of CDN, let’s first look at the traditional access process without caching services, so as to understand the difference between CDN cached access and non-cached access: From the diagram above, we can see that the process for users accessing a website without CDN caching is: 1) The user provides the domain name to be accessed to the browser; 2 …
Most domain registrars support DNS resolution for multiple A records, which is essentially DNS round-robin. The DNS server distributes resolution requests to different IPs one by one according to the order of the A records, thus achieving simple load balancing.
The main advantage is virtually no cost, since this type of resolution is usually provided free by domain registrars…
Are you planning to switch from Windows to Linux, or have you just made the switch? Oops!!! What am I saying — whatever the reason, here you are in my world. From my past experience, when I first started using Linux, the commands, the terminal, and all that really freaked me out. I worried about how many commands I’d need to memorize just to get things done…
In large-scale web applications, the database often becomes a bottleneck for concurrent access. To effectively resolve this bottleneck, a multi-database master-slave model is used to increase the web application’s concurrent access capacity.
The master-slave model addresses data synchronization issues.
SQL Relay solves connection pooling …
