CentOS 7.x Install nessus

To Install nessus on CentOS 7.x use following steps:

Disable firewalld and selinux

systemctl stop firewalld
systemctl disable firewalld
setenforce 0
#set SELINUX=disabled in below file
vim /etc/sysconfig/selinux

Copy nessus rpm and use "yum localinstall" to install it. For Example
```
yum localinstall Nessus-8.1.2-es7.x86_64.rpm
```

Start and enable nessusd

systemctl start nessusd
systemctl enable nessusd  #Gives error

Access nessus at https://FQDN:8834/ port
Create root account with desired password
Paste activation key for 7 day trial
Wait for installer to download plugins and compile them. It might take considerable time.

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