Challenges 🏆

Practical DevOps problems for all skill levels and interests

Make a Kubernetes Pod Survive an OOM Event Without Restarting 

Hard,  on  Kubernetes ,  Containers ,  Linux ,  Submissions: 2/16
#pod-resources #cgroups #oom

Deploy a Resource-Greedy Pod Without Breaking the Kubernetes Cluster 

Easy,  on  Kubernetes ,  Containers ,  Submissions: 15/42
#kubernetes-101 #pod-resources #cgroups

Limit CPU and Memory Usage of a Docker Compose Application 

Medium,  on  Containers ,  Linux ,  Submissions: 8/19
#docker #docker-compose #cgroups

Make the Container Exit When One of Its Processes Runs Out of Memory 

Medium,  on  Containers ,  Linux ,  Submissions: 8/30
#docker #cgroups #systemd

Kill the Entire Process Group When One Process Runs Out of Memory 

Medium,  on  Linux ,  Submissions: 8/24
#cgroups #oom

Limit CPU and Memory Usage of a Linux Process 

Easy,  on  Linux ,  Submissions: 13/41
#cgroups

Restart a Container With Limited Resources 

Medium,  on  Containers ,  Submissions: 38/127
#containers-101 #cgroups #docker

Write a Dagger Function to Test a Go Project 

Medium,  on  CI/CD ,  Submissions: 9/38
#dagger #docker

Docker Scout: Remediating CVEs in a Container Image 

Easy,  on  Containers ,  Security ,  Submissions: 43/141
#docker-scout #docker

Write a Dagger Function to Build a Go Project 

Medium,  on  CI/CD ,  Submissions: 10/46
#dagger #docker

Create Your First Dagger Module 

Easy,  on  CI/CD ,  Submissions: 27/79
#dagger #docker

Install the Dagger CLI on a Linux Host 

Easy,  on  CI/CD ,  Submissions: 61/83
#dagger #docker

Copy Files To/From a Running Kubernetes Pod: a Distroless Image Case  Premium

Hard,  on  Containers ,  Kubernetes ,  Submissions: 18/100
#kubectl #distroless #debugging

Copy Files To/From a Running Kubernetes Pod: a Simple Case 

Easy,  on  Containers ,  Kubernetes ,  Submissions: 112/161
#kubectl #debugging

Copy Files To/From a Running Docker Container 

Easy,  on  Containers ,  Submissions: 87/150
#docker #debugging

Extract the Filesystem of a Container Image 

Medium,  on  Containers ,  Submissions: 40/139
#container-images #debugging #docker

Edit a File in a Running Container: a Simple Case 

Easy,  on  Containers ,  Submissions: 235/362
#debugging #docker

Edit a File in a Running Container: a Slim Base Image Case 

Medium,  on  Containers ,  Submissions: 117/160
#debugging #slim-images #distroless

Edit a File in a Running Kubernetes Pod: a Tricky Case 

Hard,  on  Containers ,  Kubernetes ,  Submissions: 42/209
#debugging #slim-images #distroless

Pick the Right Distroless Base Image For Your Application  Premium

Hard,  on  Containers ,  Submissions: 19/45
#container-images #slim-images #distroless

When a FROM scratch Container Image Is Not Good Enough 

Medium,  on  Containers ,  Submissions: 53/160
#container-images #slim-images #distroless

What Port Does This Kubernetes Pod Listen On? 

Medium,  on  Kubernetes ,  Containers ,  Networking ,  Submissions: 88/255
#debugging #slim-images #distroless

Send a Signal to a Kubernetes App: a Simple Case 

Easy,  on  Kubernetes ,  Containers ,  Submissions: 160/349
#debugging #kubectl #signals

Send a Signal to a Kubernetes App: a Non-Root Container Case  Premium

Hard,  on  Kubernetes ,  Containers ,  Submissions: 26/52
#ephemeral-containers #debugging #slim-images

Send a Signal to a Kubernetes App: a Slim Container Case 

Medium,  on  Kubernetes ,  Containers ,  Submissions: 85/202
#ephemeral-containers #debugging #slim-images

Create and Start a Container Manually With runc  Premium

Hard,  on  Containers ,  Submissions: 10/97
#oci-runtime #runc #rootfs

Start and Inspect a Container With containerd CLI - ctr 

Medium,  on  Containers ,  Submissions: 56/162
#containers-101 #containerd #ctr

Start and Inspect a Container With contaiNERD CTL (nerdctl) 

Easy,  on  Containers ,  Submissions: 108/178
#containers-101 #containerd #nerdctl

Start and Inspect a Container With Podman 

Easy,  on  Containers ,  Submissions: 102/161
#containers-101 #podman

Start and Inspect a Container With Docker 

Easy,  on  Containers ,  Submissions: 233/433
#containers-101 #docker

Forward a Port Using the Hackers' Swiss Army Knife: netcat  Premium

Medium,  on  Linux ,  Networking ,  Submissions: 24/79
#port-forwarding #netcat

Forward a Port Using The Multipurpose Relay Tool: socat 

Easy,  on  Linux ,  Networking ,  Submissions: 145/253
#port-forwarding #socat

Forward a Port Without Starting a Proxy Process 

Medium,  on  Linux ,  Networking ,  Submissions: 50/180
#port-forwarding #iptables

Reproduce a Docker Bridge Network Using Basic Linux Commands  Premium

Hard,  on  Linux ,  Containers ,  Networking ,  Submissions: 13/29
#netns #iptables #bridge

Connect Multiple Network Namespaces 

Hard,  on  Linux ,  Containers ,  Networking ,  Submissions: 36/109
#netns #veth #bridge

Connect Two Network Namespaces 

Medium,  on  Linux ,  Containers ,  Networking ,  Submissions: 77/164
#netns #veth #ip

Set Up Network Address Translation (NAT) for a Container 

Medium,  on  Linux ,  Containers ,  Networking ,  Submissions: 38/71
#netns #iptables #nat

Create a Linux Network Namespace 

Easy,  on  Linux ,  Containers ,  Networking ,  Submissions: 227/334
#netns #nsenter #unshare

Network Access to a Container Started by ctr 

Hard,  on  Linux ,  Containers ,  Networking ,  Submissions: 43/71
#containerd #ctr #docker

Copying Files From Container Images Using ctr  Premium

Hard,  on  Containers ,  Submissions: 19/23
#container-images #containerd #ctr

Label a Container Image Using ctr 

Easy,  on  Containers ,  Submissions: 79/98
#container-images #containerd #ctr

Pulling Container Images Using ctr 

Easy,  on  Containers ,  Submissions: 115/159
#container-images #containerd #ctr

Tagging and Pushing Container Images Using ctr 

Easy,  on  Containers ,  Submissions: 92/132
#container-images #containerd #ctr

Reading Container Image Labels Using ctr  Premium

Medium,  on  Containers ,  Submissions: 23/37
#container-images #containerd #ctr

Access a Docker Container With No Published Ports 

Medium,  on  Linux ,  Containers ,  Networking ,  Submissions: 111/163
#containerd #ctr #docker

Execute a Command in a Docker Container Using ctr 

Medium,  on  Containers ,  Submissions: 37/58
#containerd #ctr #docker

Working With containerd Namespaces 

Easy,  on  Containers ,  Submissions: 80/175
#containerd #ctr #docker

Kubernetes Pod With a Faulty Init Sequence 

Medium,  on  Kubernetes ,  Containers ,  Submissions: 50/218
#sidecar #init-containers

Kubernetes Pod With a Sleepy Init Sequence 

Medium,  on  Kubernetes ,  Containers ,  Submissions: 36/176
#sidecar #init-containers
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