One of the most common tasks that a website owner will do is upload one or more files to their site. While it is a simple task, there are many ways to go about accomplishing it, each with their own quirks and best practices.
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zone file Knowledge Base
How To: Upload Files To A Server
Updating an A record from Command Line
Domain Name Service, or DNS, can be one of the most be one of the more complicated concepts in server administration. This article will walk through changing an A record from the Linux command line.
This article assumes that you are running BIND on a linux server, that you already have an understanding of what DNS is, the different types of DNS entries, and how DNS works. Please note: The incorrect editing of your zone file can take your site offline. All editing must be done on the authoritative nameservers for the given domain.
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Digging Into Exim Mail Logs With Exigrep
Perhaps a particular domain on your cPanel server has stopped receiving e-mail. Or, an address on your domain is able to receive e-mail, except from your supplier. Maybe you can receive e-mail just fine, but are receiving error message bounce-backs from Yahoo. How are you going to get the fine-grained information you need to figure out just what is going on?
The answers you seek can be found in exim’s logs.
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Understanding Load Balancing
Load balancing is the distribution of a workload across many nodes. In the webhosting industry, it is typically used for balancing http traffic over multiple servers acting together as a web front-end. For the sake of this article, we will focus on the balancing of HTTP and HTTPS traffic through a Zeus Load Balancer.
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Apache Error: “semget: No space left on device”
If Apache fails, and will not successfully start again, check the error log. If you see an error similar to the following, it could indicate that your server has run out of semaphores.
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How To: Lowering Your DNS TTLs
Whenever making DNS changes, lowering your TTLs (Time To Live) 24 hours ahead of time will reduce the amount of time that your change takes to propagate.
This article assumes that you are running BIND on a linux server, that you already have an understanding of what DNS is, the different types of DNS entries, and how DNS works. Please note: The incorrect editing of your zone file can take your site offline. All editing must be done on the authoritative nameservers for the given domain.
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Server Resource Analysis with sar
When reviewing the resources utilized by your server, there are a plethora of tools at your disposal. The sar command is a powerful Linux command line utility that can be used to review a server’s resource usage.
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How to use Grep
Imagine you have a file. Perhaps it is a log file. It is long, and has much information in it. And buried somewhere in that file, there is one piece of information that you need to find. It would take far too long to read through the huge file. This situation cries out for some faster method of extracting that piece of information.
For this very task, Linux provides us grep.
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Who’s SSHed Into My Server?
So you know how to ssh into your server. We at Liquid Web do too. Sometimes, in the course of supporting you, we need to ssh into the server to figure out what the problem is.
But how do you know if we have shelled into your server? If more than one person is shelled into a server, and all are trying to fix a problem, it is possible that they could step on each others’ toes. It would be grand if the shell provided a simple yet mighty command that displayed all of the users who are shelled in.
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CSF: Config Server Firewall Installation
An alternative firewall to APF is the Config Server Firewall, or CSF.
CSF is generally considered a more advanced firewall as there are more configuration options compared to other firewalls, while still being simple enough to install and configure that even novice administrators can use it. This article will give you a simple overview about how to install and configure CSF and its security plugin LFD (Login Failure Daemon).
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