A service stuck in a stopping or starting state can make for a frustrating experience for a Windows systems administrator trying to avoid a mid-day server restart.

Using the DOS Taskkill command can allow you to put off rebooting the server until after business hours.

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If you run your own mail server you’ll want it to run spam filtering software to reduce the number of unsolicited emails your users receive.  SpamAssassin is an effective spam filter that’s relatively easy to install and run.

This article was written for a CentOS 6.0 server running Postfix and Dovecot, but SpamAssassin can work with other operating systems and is compatible with most other common mail server software.

Installation

The first thing we will want to do is run an update on our CentOS distribution if we haven’t already.

Once the distribution has been updated, we will want to install SpamAssassin using yum.

sudo yum install spamassassin

Now that we have installed SpamAssassin onto our mail server we will need to configure the SpamAssassin rules within the local.cf file to set filter preferences. Continue Reading

How to change the domain name of your linux box.

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Summary of Roles

• Super Admin – somebody with access to the site network administration features and all other features. See the Create a Network article.
• Administrator – somebody who has access to all the administration features within a single site.
• Editor – somebody who can publish and manage posts including the posts of other users.
• Author – somebody who can publish and manage their own posts.
• Contributor – somebody who can write and manage their own posts but cannot publish them.
• Subscriber – somebody who can only manage their profile.

GNU Screen is an often overlooked application which allows you to run programs in a console section, detach from them and then later resume them. They even keep running when you logout.

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SELECT * FROM tablename 
WHERE columname BETWEEN '2012-12-25 00:00:00' AND '2012-12-25 23:59:59'

Example of etching data with a between statement

Type the following ps command to display all running process:
# ps aux | less

Where,

• -A: select all processes
• a: select all processes on a terminal, including those of other users
• x: select processes without controlling ttys

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When creating new folder/directories in the /var/www folder you will need to make sure the Apache2 service has read access.

In my limited experience this the user/group is www-data

You can change the owner of a folder using the “chown” command

Chmod is used to change the permission for the current owner, group and other

Chown is used to change the owner, group and other

Permissions
u – User who owns the file.
g – Group that owns the file.
o – Other.
a – All.
r – Read the file.
w – Write or edit the file.
x – Execute or run the file as a program.

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