A open dns resolver provides name resolution to any clients outside of its LAN / WAN or authoritative domains. Open DNS resolvers are a bad as they are usually involved in attacking DDoS attacks, spoofing, DNS cache poisoning, and much more. It allows everyone to use your network resources and bandwidth. Run the following command to test your BIND DNS (or any other DNS software) server for open recursion:
How to Mount a Filesystem with a Delay After a Reboot
All systems get rebooted at the same time, and network filesystems must wait for the servers to be available.
This can take more than 5 to 10 minutes, so the server boot process cannot be delayed that long and an alternative solution is desired.
Create and Delete Group in CentOS/Red Hat
Command to create and delete group in Red Hat and CentOS linux
To create new group ,use given below command
# groupadd groupname
Show User Account Password Expiration
To get details of user account show account aging, password expiration ,we use the command chage.
With chage command use the option -l or –list.
Squid Service Start/Restart in CentOS
Log into SSH on your dedicated or cloud server.
Start the Squid service
#/etc/init.d/squid start
Find Installation Date and Time of RPM Package
RPM stands for Red Hat Packet Manager. It is a package management system in all Red Hat based Operating System (RHEL/CentOS/Scientific Linux). In RPM known file format .rpm is used. rpm.org community is involve in maintenance and development of RPM.
How to Use chown in Linux
Use the chown command to change file owner and group information. Use the chmod command to change file access permissions such as read, write, and access.
How to Force fsck on Reboot
The system utility fsck (for “file system check”) is a tool for checking the consistency of a file system in Unix and Unix-like operating systems.
cPanel URL Redirect
Creating A MySQL Table
Before you can do anything with your database, you must create a table. A table is a section of the database for storing related information. In a table you will set up the different fields which will be used in that table. Because of this construction, nearly all of a site’s database needs can be satisfied using just one database.
