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This one is a bit easy because it just requires installing a service package onto the app servers.

The tricky part is that the required package changes everytime I restart the lab.

I had three attempts on this lab because I wanted to redo the lab in the shortest possible time.

Each time I redo the lab, i get different packages.

The first one was NSCD, then POSTFIX, then finally HTTPD which is the one I'm most familiar of.

So, below are the commands I used for this lab.

To log in to the three app servers:

sshpass -p '' ssh -o StrictHostKeyChecking=no tony@172.16.238.10 sshpass -p '' ssh -o StrictHostKeyChecking=no steve@172.16.238.11 sshpass -p '' ssh -o StrictHostKeyChecking=no banner@172.16.238.12 sshpass -p '' ssh -o StrictHostKeyChecking=no peter@172.16.239.10

To install httpd and make sure that it'll be enable upon bootup:

sudo yum install -y httpd sudo systemctl enable httpd sudo systemctl start httpd sudo systemctl status httpd systemctl list-unit-files | grep httpd # this may be optional but is also useful

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