CentOS

1. Firstly, we need to create a directory to store the repository certificates in:

      mkdir -p /etc/ssl/nginx

2. Next, you will need to download both the private and public certificates from the NGINX customer portal (https://cs.nginx.com), which should be named:

      nginx-repo.key
      nginx-repo.crt

3. Copy these files into the directory created. We can then ensure that the root CA certificate bundle has been installed:

      yum install -y ca-certificates

4. We can now install the NGINX Plus repository:

      yum-config-manager --add-repo \
      https://cs.nginx.com/static/files/nginx-plus-7.repo

5. With the repository keys ready and the repository installed, we can now install NGINX Plus:

      yum install -y nginx-plus

6. If you have the correct keys, this will install NGINX Plus. You can confirm the installation is correct by inspecting the version:

      nginx -v

This should give you an output similar to the following:

      nginx version: nginx/1.11.10 (nginx-plus-r12-p3)

7. Lastly, we can start and ensure that NGINX Plus automatically starts after boot:

      systemctl enable nginx
      systemctl start nginx

The installation of NGINX Plus is now complete.