Practitioner Level

Using a Oneshot Systemd Service

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15 minutes

4 Learning Objectives

About this Hands-on Lab

Managing services with `systemd` is a skill that modern Linux system administrators require to enable or disable processes to run as a service on the system. Being able to troubleshoot systemd services is invaluable for correct system operation. In this activity, you will learn about managing systemd services by troubleshooting why a oneshot systemd service is failing. Once this activity is complete, you should be comfortable managing `systemd` services with `systemctl`.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Use systemctl to check the status of target.service. Update the systemd oneshot service unit file named target.service.

Using systemctl check the status of the target.service.

systemctl status target.service
systemctl status -l target.service

Using the editor of your choice, update the /etc/systemd/system/target.service file to match the following contents.

[Unit] 
Description=Log when default target reached
After=cloud-final.service 

[Service] 
Type=oneshot        
RemainAfterExit=yes   
ExecStart=/bin/echo "--->  Reached default.target"
ExecStart=/bin/ls -l /etc/systemd/system/default.target 

[Install]  
# WantedBy is similar to runlevel
WantedBy=default.target

Reload the `systemd` daemon for updated unit file to be available. Check to see if service will start.

Use the systemctl command to reload the systemd daemon, so the new unit file can be managed.

 systemctl daemon-reload

Use the systemctl command to start and check status of the target.service.

 systemctl start target.service
 systemctl status target.service

Enable the `target.service` and reboot system.

Using the systemctl command enable the target.service and reboot the system to verify operation of service at boot time.

 systemctl enable target.service
 reboot

Reconnect to system and check the status of the `target.service`.

First, you will need to use your lab credentials to reconnect to the system and access the root account. Then, use the systemctl command to view the status of the target.service. It should show that the target.service started correctly.

 sudo -i
 systemctl status target.service

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Additional Resources

The lead System Administrator has implemented a service that runs once (oneshot) when the system reaches the default.target. This service is supposed to log when the system has reached the default.target, and list the link for the default.target, but this service is failing and we have been asked to troubleshoot the problem.

<br>Once the /etc/systemd/system/target.service has been corrected for the error inside it, we will have to reload the systemd daemon, and start the service to make sure it runs. Since this service is supposed to run at boot time, we will also make sure that the service is enabled, reboot the system, and check the status of the target.service to make sure it is starting properly.

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Everything in Personal Basic, plus:
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No account setup or cloud bills

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Learn without limits

Learn from anywhere with unlimited access to certification courses and deep dives on AWS, Azure, GCP, Linux, and so much more.

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limited

Pop quiz, hot shot

Quickly check your knowledge on a variety of topics and know where to brush up with short quizzes.

ACG Original Series

Keep up with the cloud

Stay up-to-date on all things cloud with weekly and monthly videos about the latest developments in AWS, Azure, GCP, and Kubernetes.

Community Forums

Cloud with friends

Get the help you need, when you need it, from industry experts and other learners in the community — and help others in turn.

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Go from novice to guru in your chose specialty

Not sure how to proceed? We’ll guide you through the exact skills you need to gain to progress from novice to guru across a variety of cloud specialties, including Architect, Security, and DevOps.

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Learn cloud from anywhere with our mobile apps for iOS and Android.

Mobile Offline Mode

Learn off the grid

No internet connection? No problem. Download courses for offline access with our app for iOS and Android.

Unlimited Hands-on Labs

Get your hands cloudy

Learn by doing with guided labs based on real-world scenarios in a secure, risk-free environment. Build new skills in as little as 15 minutes.

Practice Exams

Put your skills to the test

Prepare for your certs with practice exams that mimic the real thing. Plus, get personalized pointers on how to improve your score.

Interactive Diagrams

Study aids on demand

Snag clickable, PDF versions of core concepts to revisit later. Our diagrams make great study aids, help build retention, and can act as handy cheat sheets for a quick refresher down the road.

Video Transcripts & Captions

For the record

Read along when sound isn’t an option and skip furiously scribbling notes. Our transcripts and captions are also fully searchable, making it easy to find exactly what you’re looking for.

Records of Completion

Achievement unlocked

Earn a little something when you complete courses. Records of completion make it easy to mark and showcase your progress.

Email Support

Cloud on demand

Spin up pre-configured, auto-provisioned servers in just a few clicks. Cloud along with courses, practice whenever you feel like it, and never worry about a surprise cloud bill.

Cloud Playground - Instant Terminal

SSH on demand

Quickly launch a secure, in-browser SSH terminal into any instance on any provider – even behind a firewall.

Cloud Playground - Sandboxes

Personal Plus Only

Learn by doing

Learn by doing with Cloud Playground. Try out new cloud skills in live AWS, Azure, and GCP sandbox environments — without racking up a surprise bill. Cloud along with courses, test an idea at work or prepare for exams.

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Using a Oneshot Systemd Service

About this Hands-on Lab

Learning Objectives

Additional Resources

What are Hands-on Labs

Plans & Pricing

Choosing is the first step

Business Basic

Business Plus

Learning without limits

Learn faster by doing

Take your teams from novice to guru

Cloud on demand

SSH on demand

Learn by doing

Keep up with the cloud

Put skills to the test

Pop quiz, hot shot

Cloud with friends

Keep ACG in your pocket

Learn off the grid

Achievement unlocked

For the record

Study aids on demand

We’re here to help

One dashboard to rule them all

Manage cloud learning for teams

Know where you stand

Get to the cloud faster

Learn better together

Skills at a glance

Easy organization by teams

Invite 10 to 10,000 or more

Connect all the dots

Get your bits

We’ve got your back

We’ll show you the ropes

Plans & Pricing

Choosing is the first step

Free

Personal Basic

Personal Plus

Learn without limits

Pop quiz, hot shot

Keep up with the cloud

Cloud with friends

Go from novice to guru in your chose specialty

Keep ACG in your pocket

Learn off the grid

Get your hands cloudy

Put your skills to the test

Study aids on demand

For the record

Achievement unlocked

We’re here to help

Cloud on demand

SSH on demand

Learn by doing

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