We can presume cloud to be a very large server on which different services and data are stored and you can access all these for your work. The software and data that you access to your work doesn’t exist on your computer instead it’s on the server. This concept of using services not stored on…
Some time we need to insert text or string at the end of the line in a file. This can be done using two methods “awk” and “sed” command. Below are the examples: Insertion with sed at the end of the line If you want to insert the text during the execution of the command…
Firewall plays an important role in the protection of the server. Firewall protects the servers against harmful stuff. Firewall controls the incoming and outgoing traffic by analyzing the packet and determine whether they are allowed through or not based on set of rules. In Linux we uses IPTABLES to manage the firewall rules. But its…
The Secure Shell (ssh) protocol by default uses the port 22. Attackers mostly uses the port 22 in automated attack and changing the default will prevent your server from these automated attack. There are many ways of making your server secure and changing the default ssh port is one of the server hardening. Steps to…
SMTP uses port 25 as its default port. When you configure mail server on your server, port 25 is use to send mails. Sometimes ISP blocked the 25 port for junk mail protection as a result you are unable to send mails from your server. Most the ISP suggests to change the Default SMTP port…