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plugin/trace-dns: Trace DNS requests using Inspektor Gadget (#2986) 

Signed-off-by: Qasim Sarfraz <qasimsarfraz@microsoft.com>
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Qasim Sarfraz 2024-11-28 18:40:58 +01:00 committed by GitHub
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5
plugins/README.md
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@ -5,7 +5,7 @@ K9s plugins extend the tool to provide additional functionality via actions to f
Following is an example of some of plugin files in this directory. Other files are not listed in this table.
| Plugin-Name | Description | Available on Views | Shortcut | Kubectl plugin, external dependencies |
| ------------------------------ | ---------------------------------------------------------------------------- | ----------------------------------- | --------- | ------------------------------------------------------------------------------------- |
| ------------------------------ | ---------------------------------------------------------------------------- | ----------------------------------- |-----------| ------------------------------------------------------------------------------------- |
| debug-container.yml | Add [ephemeral debug container](1)<br>([nicolaka/netshoot](2)) | containers | Shift-d | |
| dive.yml | Dive image layers | containers | d | [Dive](https://github.com/wagoodman/dive) |
| get-all.yml | get all resources in a namespace | all | g | [Krew](https://krew.sigs.k8s.io/), [ketall](https://github.com/corneliusweig/ketall/) |
@ -17,8 +17,9 @@ Following is an example of some of plugin files in this directory. Other files a
| log_full.yml | get full logs from pod/container | pods/containers | Ctrl-l | |
| ai-incident-investigation.yaml | Run AI investigation on application issues to find the root cause in seconds | all | Shift-h/o | [HolmesGPT](https://github.com/robusta-dev/holmesgpt) |
| toggle-keda | Enable/disable [keda](3) ScaledObject autoscaler | scaledobjects | Ctrl-N | |
| trace-dns | Trace DNS resolution using Inspektor Gadget (4) | containers/pods/nodes | Shift-d | |
[1]: https://kubernetes.io/docs/tasks/debug/debug-application/debug-running-pod/#ephemeral-container
[2]: https://github.com/nicolaka/netshoot
[3]: https://keda.sh/
[4]: https://inspektor-gadget.io/

65
plugins/trace-dns.yaml Normal file
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@ -0,0 +1,65 @@
# Author: Qasim Sarfraz
# Trace DNS requests for containers, pods, and nodes
# Requires kubectl version 1.30 or later
# https://github.com/inspektor-gadget/inspektor-gadget
# https://www.inspektor-gadget.io/docs/latest/gadgets/trace_dns
plugins:
trace-dns:
shortCut: Shift-D
description: Trace DNS requests
scopes:
- containers
- pods
- nodes
command: bash
confirm: false
background: false
args:
- -c
- |
IG_VERSION=v0.34.0
IG_IMAGE=ghcr.io/inspektor-gadget/ig:$IG_VERSION
IG_FIELD=k8s.podName,src,dst,qr,qtype,name,rcode,latency_ns
GREEN='\033[0;32m'
RED='\033[0;31m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color
# Ensure kubectl version is 1.30 or later
KUBECTL_VERSION=$(kubectl version --client | awk '/Client Version:/{print $3}')
if [[ "$(echo "$KUBECTL_VERSION" | cut -d. -f2)" -lt 30 ]]; then
echo -e "${RED}kubectl version 1.30 or later is required${NC}"
sleep 3
exit
fi
clear
# Handle containers
if [[ -n "$POD" ]]; then
echo -e "${GREEN}Tracing DNS requests for container ${BLUE}${NAME}${GREEN} in pod ${BLUE}${POD}${GREEN} in namespace ${BLUE}${NAMESPACE}${NC}"
IG_NODE=$(kubectl get pod "$POD" -n "$NAMESPACE" -o jsonpath='{.spec.nodeName}')
kubectl debug --kubeconfig=$KUBECONFIG --context=$CONTEXT -q \
--profile=sysadmin "node/$IG_NODE" -it --image="$IG_IMAGE" -- \
ig run trace_dns:$IG_VERSION -F "k8s.podName==$POD" -F "k8s.containerName=$NAME" \
--fields "$IG_FIELD"
exit
fi
# Handle pods
if [[ -n "$NAMESPACE" ]]; then
echo -e "${GREEN}Tracing DNS requests for pod ${BLUE}${NAME}${GREEN} in namespace ${BLUE}${NAMESPACE}${NC}"
IG_NODE=$(kubectl get pod "$NAME" -n "$NAMESPACE" -o jsonpath='{.spec.nodeName}')
kubectl debug --kubeconfig=$KUBECONFIG --context=$CONTEXT -q \
--profile=sysadmin -it --image="$IG_IMAGE" "node/$IG_NODE" -- \
ig run trace_dns:$IG_VERSION -F "k8s.podName==$NAME" \
--fields "$IG_FIELD"
exit
fi
# Handle nodes
echo -e "${GREEN}Tracing DNS requests for node ${BLUE}${NAME}${NC}"
kubectl debug --kubeconfig=$KUBECONFIG --context=$CONTEXT -q \
--profile=sysadmin -it --image="$IG_IMAGE" "node/$NAME" -- \
ig run trace_dns:$IG_VERSION --fields "$IG_FIELD"