How to install OpenVas in Centos 6/7 and Fedora 23/24

Install OpenVas in Centos 6/7 and Fedora 23/24
OpenVAS (Open Vulnerability Assessment System,the name of the fork originally known as GNessUs) is a framework of several services and tools offering a vulnerability scanning and vulnerability management solution.
All OpenVAS products are Free Software. Most components are licensed under the GPL.

OpenVas began, under the name of GNessUs, as a fork of the previously open source Nessus scanning tool after Tenable Network Security changed it to a proprietary (closed source) license in October 2005. OpenVAS was originally proposed by pentesters at Portcullis Computer Security and then announced by Tim Brown on Slashdot.

OpenVAS is a member project of Software in the Public Interest.
INSTALLATION
First you need Install required packages Bellow

yum install wget bzip2 texlive net-tools alien

After that need to add atomic repository to install openvas as follows

wget -q -O - http://www.atomicorp.com/installers/atomic |sh

Now Disable The SELINUX

Edit /etc/selinux/config

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of these two values:
#     targeted - Targeted processes are protected,
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

Now install Openvas by using following command in terminal by using yum

yum -y install openvas

Now Edit the openvas config file and add or uncomment the following lines

edit /etc/redis.conf

unixsocket /tmp/redis.sock
unixsocketperm 700

Restart Redis

systemctl enable redis && systemctl restart redis

Once All done then start the setup process by using the command openvas-setup. This is going to take some time. You will be prompted for some information shortly

openvas-setup

It downloads the latest databases once it completed, enter the Administrator password

Step 2: Configure GSAD
The Greenbone Security Assistant is a Web Based front end
for managing scans. By default it is configured to only allow
connections from localhost.

Allow connections from any IP? [Default: yes] 
Allow connections from any IP? [Default: yes] Redirecting to /bin/systemctl restart
  gsad.service

Step 3: Choose the GSAD admin users password.
The admin user is used to configure accounts,
Update NVT's manually, and manage roles.

Enter administrator username [Default: admin] : Enter Administrator Password:
Verify Administrator Password:
Empty password not allowed.

Enter Administrator Password:
Verify Administrator Password:
Redirecting to /bin/systemctl start redis.service

Setup complete, you can now access GSAD at:
https://192.168.2.56:9392

once completed, you are able to login.Before that, we're just going to disable firewalld service. my case i have centos 7 it's depend on os version

systemctl stop firewalld
systemctl mask firewalld

Or You can exception for tcp 9392

firewall-cmd --permanent --zone=public --add-port=9392/tcp
firewall-cmd --reload

Now Go to your web browser, type the url as https://192.168.2.56:9392(In my case my ip address is 192.168.2.56) default username is admin and enter the password entered during setup, and you should be able to login.