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Tag Archives: server

July, 2010

  • 21 July

    How to Change Your FTP Port

    The default port for most FTP servers is 21, and that is how most system administrators will leave it. The majority of FTP clients are configured to use it, and some will not even ask you to change it unless you dig through the configuration. There are, however, a few …

  • 19 July

    How to Force YUM to Exclude Certain Packages

    linux yum

    YUM is a package management system for Red Hat Enterprise Linux (RHEL), CentOS, Fedora, and other Red Hat-based Linux operating systems. It is command-line driven and is an easy tool you can use to keep your server updated and install any new software you need. Normally, when you perform updates, …

  • 19 July

    What is Anonymous FTP?

    By default, FTP servers require the user to login in order to upload or download files. Many web hosts, however, additionally offer the ability to use anonymous FTP. It basically gives you the ability to allow users to login to the FTP server without providing a username or a password. …

  • 16 July

    How to Fix an Open Relay in Postfix

    postfix

    As I have been reiterating all week, an open relay is a bad idea. If your mail server is left open, anyone can use your SMTP service to send mail, and spammers will use it. This can result in your server being blacklisted and extraneous use of system resources that …

  • 15 July

    How Do Spammers Send Spam from My Server?

    spamwall

    When your server has become a haven for spammers, it is never a pleasant ordeal. Your server will probably be blacklisted, causing many of the emails you send to bounce back, and you may have serious connection problems due to the spammer using valuable system resources. There are a couple …

  • 15 July

    Mail Server Causing High Server Load

    Question: My CPU usage on my server is very high, and it seems to be originated from my mail server. What could be the problem? Answer: If your mail server is sucking up valuable CPU power, there are a couple of possibilities, none of which are pleasant. 1. You or …

  • 13 July

    Server Hardware: Celeron vs. Xeon

    Intel processors have a variety of names, and there is no shortage in the number of variations. When you are looking to lease or purchase a server, this can be confusing. On the current market, you may find servers with Intel’s Core 2, Celeron, Xeon, and the newer Core i7. …

  • 12 July

    Take a look at a Google server

    Google has long been a leader in the search industry, but did you know that the company is also a pioneer of data center technology? The video above shows a typical Google web server on display at the Google Data Center Energy Summit in 2009. As you can see, Google …

  • 12 July

    Troubleshooting Database Connections

    database connection error

    When MySQL works correctly, it can be a thing of beauty, but when something goes wrong, it can drive you mad. Here are a few things you can do to troubleshoot connection problems: 1. Make sure your username and password are correct. 2. Double-check the hostname. Although “localhost” works on …

  • 9 July

    How to Delete Tables and Rows in MySQL

    mysql

    As I mentioned in a previous MySQL post, knowing how to quickly perform database tasks from the command line is a good idea if you are a Linux system administrator. Sometimes, it is the easier way to get things done, especially if you are helping another user and need root …