AWS · CLF-C02
AWS Certified Cloud Practitioner
The foundational AWS exam: what the cloud is for, who secures what, which service fits which job, and how AWS bills for it.
DevOps & SRE troubleshooting practice
Get paged.
Fix prod.
Level up.
FixOps drops you into simulated production incidents: alerts firing, a service down, a shell that answers like the real one. Find the cause, fix it, and prove the recovery. Learn DevOps and SRE by doing the job.
- 61 incidents
- 479 lessons
- 22 certification exams
- Free, no signup
Certification exam prep
Studying for AWS, Azure, Google Cloud or Kubernetes?
Original practice questions with every answer explained, timed mock exams, and CKA, CKAD and LFCS tasks graded in the simulator. Every exam has a free sample.
AWS · SAA-C03
AWS Certified Solutions Architect - Associate
Scenario questions on designing AWS architectures that are secure, resilient, fast and cost-aware, and on choosing between services that all look plausible.
CNCF · CKA
Certified Kubernetes Administrator
A hands-on exam: you are given a terminal and a list of cluster tasks. Practise them here against a simulated cluster that grades the state you leave behind. Covered: RBAC, etcd…
CNCF · CKAD
Certified Kubernetes Application Developer
A hands-on exam for people who ship applications on Kubernetes: build, configure, expose and debug workloads from the command line, graded on the resulting cluster state.…
CNCF · CKS
Certified Kubernetes Security Specialist
A hands-on exam about securing a cluster and what runs on it: you are given a terminal on a control-plane node and a list of tasks, and the state you leave behind is graded.…
HashiCorp · 004
Terraform Associate
Infrastructure as code with Terraform 1.12: providers and state, the core workflow, configuration, modules and HCP Terraform. HashiCorp publishes the objectives but not the…
CNCF · KCNA
Kubernetes and Cloud Native Associate
The entry-level Kubernetes exam: how a cluster works, how containers are orchestrated, how applications are delivered, and the cloud native ecosystem around them.
CNCF · KCSA
Kubernetes and Cloud Native Security Associate
The entry-level Kubernetes security exam: how the components of a cluster are secured, the controls Kubernetes offers for pods, identities, secrets and networks, how attackers…
CNCF · PCA
Prometheus Certified Associate
Monitoring with Prometheus: observability concepts, how the server scrapes and stores metrics, PromQL from selectors to histograms, instrumenting code and running exporters, and…
CNCF · CGOA
Certified GitOps Associate
The entry-level GitOps exam: the OpenGitOps principles and the terms they are built on, the practices GitOps grew out of, the patterns for releasing and for structuring…
CNCF · CAPA
Certified Argo Project Associate
The entry-level exam on the Argo project: Argo Workflows for pipelines and data jobs, Argo CD for GitOps delivery, Argo Rollouts for blue-green and canary releases with analysis,…
AWS · DVA-C02
AWS Certified Developer - Associate
Building on AWS: writing code against AWS services, Lambda and data stores, securing applications, deploying through CI/CD, and troubleshooting. Written to the DVA-C02 exam…
AWS · SOA-C03
AWS Certified CloudOps Engineer - Associate
Running workloads on AWS: monitoring and automated remediation, reliability and backups, deployment and automation with CloudFormation and Systems Manager, security controls, and…
AWS · DOP-C02
AWS Certified DevOps Engineer - Professional
The professional-level AWS exam for delivery and operations: pipelines and deployment strategies, infrastructure as code across many accounts, resilience, monitoring, incident…
Microsoft · AZ-900
Microsoft Azure Fundamentals
The foundational Azure exam: cloud concepts, Azure architecture and services, and management and governance. Microsoft publishes the time limit and the skill areas but not the…
Microsoft · AZ-104
Microsoft Azure Administrator
Running Azure day to day: identities and governance, storage, compute, virtual networking and monitoring. Microsoft publishes the skill areas and the pass mark but not the number…
GitHub · GH-200
GitHub Actions
Automating software delivery with GitHub Actions: writing workflows, reading and troubleshooting runs, building and publishing actions, governing actions, runners and secrets…
GitHub · GH-900
GitHub Foundations
The foundational GitHub exam: Git and GitHub basics, repositories, collaboration with issues, pull requests and discussions, Actions, Copilot and Codespaces, project tracking,…
LPI · 010-160
Linux Essentials
The entry-level Linux certificate from the Linux Professional Institute: open source and its licences, finding your way on the command line, archives, text processing and simple…
Microsoft · AZ-400
Designing and Implementing Microsoft DevOps Solutions
The exam for the DevOps Engineer Expert certification, across Azure DevOps and GitHub: planning and flow of work, source control, build and release pipelines (about half the…
Google Cloud · ACE
Associate Cloud Engineer
Google Cloud's associate certification for people who deploy, operate and secure workloads: projects, billing and the resource hierarchy, Compute Engine, GKE and Cloud Run,…
Linux Foundation · LFCS
Linux Foundation Certified System Administrator
A hands-on exam: you are given a terminal on a Linux server and a list of administration tasks. Practise them here on a simulated Ubuntu 24.04 host that grades the state you…
How a shift works
The whole incident, not just the command.
Real on-call is triage, investigation, a careful fix, proof it worked, and a clear write-up. FixOps trains every step.
- 01
Paged
A SEV card lands with the service, the symptom and the blast radius. Acknowledge and the clock starts.
- 02
Triage
Read the alerts and the dashboard. Teammates in the incident channel add context and ask for updates.
- 03
Fix
Investigate in a shell with realistic output:
systemctl,journalctl,ss,curl,docker,kubectl. - 04
Verify
Automated checks verify the recovery. Alerts resolve and the graphs come back down.
- 05
Debrief
See your timeline, how an SRE would have approached it, and write a 60-second postmortem.
Why it works
Production experience, without production.
Lab VMs are slow to boot and stuck on a desktop. Tutorials are safe but fake. FixOps is instant and still behaves like a real system.
Living systems
Systems that react to your fix.
One simulated world drives everything. Free the port and restart the unit, and the service status, the listening sockets, the health check, the alert and the graph all change together.
debug-srv (pid 4121)holding :8080stoppedcheckout.servicefailedactive (running)ss -ltn :8080debug-srvcheckoutcurl :8080/healthz404 debug-srv200 okalert CheckoutErrorsfiringresolvedOn-call simulator
Alerts, dashboards, teammates, postmortems.
An MTTR clock runs while you work, and the debrief shows your timeline.
Daily Outage
Same outage for everyone, every day.
Solve it, then share your grid. Example shown.
Skill map and career paths
See what you know. Pick where you're going.
- DevOps
- SRE
- Platform
- Kubernetes
- DevSecOps
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Cheat sheets and runbooks you can run.
Every field manual entry opens in the sandbox, and links to the lessons that teach it.
-
No VM to boot. No lab timer.
The simulator runs on your device, in the browser or the Android app, so an incident starts in seconds and never times out.
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Play first. Account later.
Start as a guest in one tap. Save your progress with Google or email whenever you're ready.
Incident catalog
Pick an outage.
Across Linux, Networking, Docker, Kubernetes, Security, Git, CI/CD, Web, Observability and Cloud, from a first config fix to multi-stage campaigns.
Linux
Beginner
Storefront Stuck in Maintenance Mode
Every Northstar Shops storefront page answers 503 with the maintenance banner, and checkout has taken no orders for 20 minutes.
Kubernetes
Intermediate
API Pods Restart Across the Rollout
Every api replica is in CrashLoopBackOff and the Deployment has shown 0 of 3 available for ten minutes.
Docker
Intermediate
Web Container Is Unreachable on Port 80
Browser customers get connection refused on port 80 while the storefront's web container reports Up.
Learning tracks
Or learn the system first.
Short, hands-on lessons with quizzes and terminal practice, from Linux basics to DevSecOps.
Beginner · 15 h
Foundation
Core Linux, networking, shell, cloud basics, and troubleshooting skills for all subsequent tracks.
Intermediate · 22 h
CI/CD
Continuous Integration and Continuous Deployment pipelines with GitHub Actions, GitLab CI, Jenkins.
Intermediate · 19 h
Infrastructure
Docker, Kubernetes, Terraform, Ansible - containerization, orchestration, IaC, config management.
Intermediate · 14 h
Monitoring & Observability
Logging, metrics, dashboards, alerting, tracing with Prometheus, Grafana, and observability tools.
Advanced · 16 h
Security (DevSecOps)
Secrets management, container security, SAST/DAST, IAM, compliance, and Kubernetes security.
Beginner · 6 h
Git for On-Call Work
Work in a shared repository the way on-call engineers do: read the working tree, integrate teammates' branches, publish without overwriting anyone, and recover or investigate a bad release with an audit trail..
Cheat sheets and roadmaps
Look it up. Plan the route.
Command references with examples and gotchas, and ordered paths from your first Linux box to the role you want. Free to read.
Roadmaps
All roadmapsBeginner · 8 weeks
DevOps roadmap
From one Linux box to a pipeline that ships and a stack you can see.
Intermediate · 9 weeks
Site reliability engineer (SRE) roadmap
Measure reliability, spend the error budget wisely, and own the pager.
Intermediate · 6 weeks
Platform engineering roadmap
Build the paved road other engineers ship on.
Intermediate · 5 weeks
Kubernetes roadmap
Know what every pod is doing, and why it is not.
Advanced · 7 weeks
DevSecOps roadmap
Security that ships with the code instead of blocking it.
Questions
The short answers.
Is it a real Linux machine?
No, and that is the point. FixOps simulates the system: a shell with realistic command output, plus services, ports, logs, alerts and metrics that react to what you do. That's why it starts instantly, never times out, and runs on a phone. Everything is labeled as simulated.
Do I need an account?
No. You start as a guest and your progress saves on your device. Sign in with Google or email later to keep it in your account.
Is it free?
Yes. Every incident and every learning track is free to play. The one paid extra is certification exam prep: each exam has a free sample, and a FixOps Pro subscription unlocks the full question banks, mock exams and graded labs.
Who is it for?
People learning DevOps, SRE or platform engineering who want practice that feels like the job, and engineers preparing for their first on-call rotation or an interview.
Will a check accept my own approach?
Most checks inspect the system after your fix instead of matching one exact command, and many incidents accept more than one valid repair. When a check fails, you see which condition is still unmet.
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