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Friday, 03 February 2006 |
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John Wigle reports : This email was sent out to all of those who directly purchase cPanel licenses, of course if you are like most people and do not directly own a license but get it through a datacenter you never got this email. I have pasted it below which also contains a fix for the perl problems which are causing a lot of trouble with just about everything, including email. I have corrected a few typo's in the email so that just copy and pasting it will now work, it was not working for their version, and added a few more commands that I needed on some servers. |
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Friday, 03 February 2006 |
Ok first just take a breath, you are getting nothing done by worrying. This guide is meant to try and help mitigate the effects of an attack that is in progresss. I have compiled a lot of the things that I do but it is very possible I have forgotten something. Please feel free to add suggestions at the bottom if you would do it a different way or if this works good for you.
This guide is not meant to take the place of a professional looking at your server but it should give you a very good idea of what is going wrong and point you in the right direction to solving the problem. A lot of this requires you to have an idea of what is happening with your server on a normal basis so you can see what is abnormal with it. It would not be a bad idea to run a few of these tests to see what is normal under your normal busy periods. |
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Friday, 03 February 2006 |
The purpose of syctl hardening is to help prevent spoofing and dos attacks. This short guide will show what I have found to be a good configuration for the sysctl.conf configuration file. The most important of the variables listed below is the enabling of syn cookie protection. Only place the bottom two if you do not want your server to respond to ICMP echo, commonly referred to as ICMP ping or just ping requests.
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Friday, 03 February 2006 |
A quick and usefull command for checking if a server is under ddos is:
netstat -anp |grep 'tcp\|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
That will list the IPs taking the most amount of connections to a server. It is important to remember that the ddos is becoming more sophistcated and they are using fewer connections with more attacking ips. If this is the case you will still get low number of connections even while you are under a DDOS.
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Friday, 03 February 2006 |
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The replace command is a very simple but VERY powerful command that comes as part of mysql. It can be used to quickly replace entries within a group of files. Generally I find it useful for mass-modification of an IP for dns or TTL for dns.
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Friday, 03 February 2006 |
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Rsync is another very powerful command that is used to sync 2 directories between servers and only transfer the new files to the server. This is a great method for backups as it is low on bandwidth and it is also commonly used to keep clustered servers working together. The ending slashes are very important when using rsync. If you are not familiar with how it works simply always make sure to have an ending slash on both the source and the destination and it should be fine. |
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Friday, 03 February 2006 |
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While many people use the grep command through a pipe | there are more efficient ways of using it. I have nearly killed a server on many occasions by running cat filename |grep some-term while the command tries to list a huge file. Instead simply use egrep which is more efficient in terms of speed and system resources. |
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Friday, 03 February 2006 |
Many more visitors beat a path to the iTunes front door, with traffic increasing dramatically year-over-year from December 2004 to December 2005.
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Friday, 03 February 2006 |
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A Google search can be a good barometer of how pervasive some stereotypes are in the world. If a search spider could sum up a nationality, a race, a religion in a few words, what would it say? What are Americans known for? What are the Europeans like? |
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Sunday, 15 January 2006 |
If pico is not installed, login to your server via SSH as root and execute the below commads :
1. wget ftp://rpmfind.net/linux/redhat/9/en/os/i386/RedHat/RPMS/pine-4.44-18.i386.rpm
2. rpm -ivh pine-4.44-18.i386.rpm
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Friday, 13 January 2006 |
If you need more info on your CPU performance just simply run this shell command:
cat /proc/cpuinfo |
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Wednesday, 11 January 2006 |
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Hang out with friends, listen to new music, talk about what's important to you, share pictures from a party, MySpace has become the teen place and now has 47.3 million users. |
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Wednesday, 11 January 2006 |
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eth00 writes: So I am sure if you are running a cPanel server you are having the exact same trouble as we have been having the last week, lots of spam! It appears there is somebody in this world that has decided to write a rather efficient script that searches for webforms then sends spam via php and bcc.
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Saturday, 17 December 2005 |
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Rebuffing aggressive overtures from Microsoft, Time Warner has agreed to sell a 5 percent stake in America Online to Google for $1 billion as part of an expanded partnership between AOL, once the dominant company on the Internet, and Google, the current online king. |
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Friday, 16 December 2005 |
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It seems no matter which flavor of linux / unix you are running and which control panel software that setting up custom name servers is always a problem. This How-To will be for installing name servers on a Linux CPanel server. Custom Name Servers are great because you can provide your webhosting customers with ns1.yourcompany.com instead of your server / upllink providers name servers. You will also know how to install Custom name servers for your reseller accounts. |
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