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A Cloud Guru

Modifying Runlevels on Linux

A runlevel is a specific mode of operation used by systems that implement System V initialization. In this lab, we are tasked with modifying runlevels for both CentOS and Ubuntu.

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Path Info

Level

Intermediate

Duration

30m

Published

Oct 23, 2020

Challenge

Configure the Runlevels on the CentOS Server
1. Use the chkconfig command to disable the crond service for runlevels 2 and 4:
```
chkconfig --level 24 crond off
```
2. Use the chkconfig to enable the httpd service for runlevels 3 and 5:
```
chkconfig --level 35 httpd on
```
Challenge

Modify the Initialization Script for the Postfix Service on the CentOS Server
1. Use a text editor to modify the init script for postfix at /etc/rc.d/init.d/postfix with the following changes:
2. Update this line:
```
# chkconfig: 2345 80 30
```
  To be:
```
# chkconfig: 3 78 35
```
3. Update this line:
```
# Default-Start: 2 3 4 5
```
  To be:
```
# Default-Start: 3
```
4. Apply the changes.
5. Remove the postfix service:
```
chkconfig --del postfix
```
6. Add the postfix service:
```
chkconfig --add postfix
```
Challenge

Remove the SysVinit Script Links for the Nginx Service on the Ubuntu server
1. Use the update-rc.d command to remove init links for nginx:
```
update-rc.d nginx remove
```
Challenge

Enable the Lighttpd Service for Runlevels 2 and 5 on the Ubuntu server
1. Use the update-rc.d command to enable lighttpd for runlevels 2 and 5:
```
update-rc.d lighttpd enable 2 5
```
Challenge

Create the Default SysVinit links for the Bluetooth Service on the Ubuntu server
1. Use the update-rc.d command to add the defaults for the Bluetooth service:
```
update-rc.d bluetooth defaults
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.