SELINUX
SELinux is a set of security rules using which we can control the processes that can access specific files, folders and ports. These processes, files, folders and ports has a special security label called SELinux…
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Configuring TLS in Postfix
This post is a continuation on previous posts. It is expected that you have a working Postfix server with Virtual Domain hosting, Dovecot based authentication and filtering using Spamassassin. The previous post in this series can be…
SSL certificate: How to create a self signed SSL certificate using a Linux server
What is an SSL certificate? An SSL Certificate (A Secure Sockets Layer certificate) is also called as a Digital Certificate. Using this certificate we can creates a secure link between a website and a client’s…
Adding a CentOS 7 host to AD using realmd
A CentOS host can be added to an AD for suthentication using samba-winbind or realmd packages. In this tutorial we will learn the simple way of using AD aunthentication using realmd packages using the below…
SELinux Security
SELinux is a set of security rules using which we can control the processes that can access specific files, folders and ports. These processes, files, folders and ports has a special security label called SELinux…
Recover a Redhat 7 or CentOS 7 root password
There can be instances where you would had lost your root user’s passwords and thus cannot perform certain activities allowed only to the root user. The process of recovering the root password in Redhat/CentOS 7…
Basic ACLs in Linux
ACL – Access Control List is a wonderful feature in linux that enables system administrators to add additional permissions on a linux folder or file. These permissions can be assigned to a user or group…
Configuring CentOS 7 linux host to function as a router
Linux has the provision to work as a router connecting two networks. In this example we have two NICs in the host. ]# ifconfig …… ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 …… inet 20.10.0.16 netmask 255.255.240.0 broadcast…
Enabling security using .htaccess file
When working with web servers, and displaying contents, you may wish to restrict access to certain pages to only authenticated users. Which means one will require a password to view these restricted pages. Though there…
Linux iptables as a Router
Netfilter : The actual filtering in a Linux box is done using Netfilter. Iptables : is the tool used to create this filters. Iptables maintain state-full firewall. Ipchains does not maintain state-full firewall The module…