Browsing all articles from March, 2010
Mar
7

Exim: remove mails in queue from a particular sender.E

“spams”, its one of the major issue that a sys admin has to deal with throughout his job.  First you need to find the user who is generating it. You can get it from the mail headers.  Once you find the user, disable the script that was responsible for spams, but it may have already kept thousands(may be lacks) of mails in the exim queue waiting for its chance to get delivered.  To delete these mails one by one is impossible.  In a cPanel server having exim mail,  you can use the following command to delete mails in the current queue generated by that particular user only.

SSH into the server
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Mar
6

OpenVZ network down SIOCADDRT: Network is unreachable

Have you ever come across in a situation where the VPS is running, but network is unreachable?  OpenVZ VPS may be up and running, but network service will be down resulting downtime for websites hosted in it. If you try to restart the network, you will get the below error:
====================================

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Mar
2

How to configure NAT with iptables on a VPS.

NAT ( network-address-translation ) with iptables  helps us in how to select the packets we want to mangle. We can easily configure NAT on a OpenVZ VPS by following the below steps.

Lets first consider a VPS in which NAT is not enabled. Trying to POSTROUTE from VPS throws you errors.

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