Lab Information
As per details shared by the development team, the new application release has some dependencies on the back end. There are some packages/services that need to be installed on all app servers under Stratos Datacenter. As per requirements please perform the following steps:
a. Install postfix package on all the application servers.
b. Once installed, make sure it is enabled to start during boot.
Lab Solutions
🧭 Part 1: Lab Step-by-Step Guidelines
Objective
On all Nautilus App Servers, you must:
Install the postfix package
Ensure the postfix service starts automatically on boot
Target servers:
Server User
stapp01 tony
stapp02 steve
stapp03 banner
1️⃣ Login to Jump Host
ssh thor@jump_host.stratos.xfusioncorp.com
Password
mjolnir123
2️⃣ Configure App Server 1
SSH to the server:
ssh tony@stapp01
Password
Ir0nM@n
Install postfix:
sudo yum install -y postfix
# Enable service at boot:
sudo systemctl enable postfix
# (Optional verify)
systemctl status postfix
exit
3️⃣ Configure App Server 2
SSH:
ssh steve@stapp02
Password
Am3ric@
Run:
sudo yum install -y postfix
sudo systemctl enable postfix
systemctl status postfix
exit
4️⃣ Configure App Server 3
SSH:
ssh banner@stapp03
Password
BigGr33n
Run:
sudo yum install -y postfix
sudo systemctl enable postfix
systemctl status postfix
🧠 Part 2: Simple Step-by-Step Explanation (Beginner Friendly)
What this lab is testing
This lab checks two Linux administration skills:
Task Command
Install package yum install
Enable service at boot systemctl enable
What is Postfix?
Postfix is a mail transfer agent (MTA).
It sends system emails such as:
alerts
logs
cron notifications
monitoring messages
Example system message:
Backup completed successfully
Step A — Install the package
Command:
yum install postfix
This downloads and installs the mail server.
Step B — Enable service at boot
Command:
systemctl enable postfix
This creates a system link so the service starts automatically whenever the server boots.
Example:
Server reboot → postfix starts automatically
Important Difference
Command Purpose
systemctl start postfix start now
systemctl enable postfix start on boot
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