How To Installing XenServer Tools On CentOS 7

What’s ss Command? ss stands for socket statistics. It is used to dump socket statistics about network/socket connections. It’s showing information similar to netstat, it works better and faster compared with netstat. It can display more TCP and state information than other tools. Since the ss command gets all the information directly from kernel space…

To print a list of the messages in the queue, enter: # exim -bp To remove a message from the queue, enter: # exim -Mrm {message-id} To remove all messages from the queue, enter: # exim -bp | awk ‘/^ *[0-9]+[mhd]/{print “exim -Mrm ” $3}’ | bashsuggested following clean command:# exim -bp | exiqgrep -i…

AWS doesn’t grant root access by default to EC2 instances. This is an important security best practise. Users are supposed to open a ssh connection using the secure key/pair to login as ec2-user. Users are supposed to use the sudo command as ec2-user to obtain elevated privileges. Problems arise with a number of software packages…

Do you know most of the security vulnerabilities can be fixed by implementing necessary headers in the response header? Security is as essential as content and SEO of your website, and thousands of websites get hacked due to misconfiguration or lack of protection. If you are a website owner or security engineer and looking to protect your…

Question How to configure the passive ports range for ProFTPd on a server behind a firewall? Answer Note: When configuring the passive port range, a selected port range must be in the non-privileged range (e.g., greater than or equal to 1024). It is strongly recommended that the chosen range should be large enough to handle…

On some occasions apache server will just fail, and become crashed, failing to restart with an error message like # tail /var/log/httpd/error_log [Sun Dec 22 10:05:27.006998 2013] [core:emerg] [pid 15001:tid 140145945569216] (28)No space left on device: AH00023: Couldn’t create the fcgid-proctbl mutex [Sun Dec 22 10:05:38.000403 2013] [core:emerg] [pid 15018:tid 140368783902656] (28)No space left on…