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Changed to have to specify namespace and context. #3

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16acb1c
Changed to have to specify namespace and context.
ykwyuta Oct 6, 2021
9873c74
Update README.md
ykwyuta Oct 6, 2021
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4 changes: 2 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -6,8 +6,8 @@ A humble bash script set that uses daemonset to capture tcpdump from all k8s nod

As simple as:

1. Call `dspcap-start` script to start capture.
2. Call `dspcap-stop` script to stop capture and collect result to `dspcap` directory.
1. Call `dspcap-start context-name kubernetes-namespace` script to start capture.
2. Call `dspcap-stop context-name kubernetes-namespace` script to stop capture and collect result to `dspcap` directory.

## Finetune tcpdump command

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12 changes: 10 additions & 2 deletions dspcap-start
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@@ -1,11 +1,19 @@
#!/bin/bash

if [ $# -ne 2 ]; then
echo "./dspcap clustercontext k8snamespace"
echo "ex: ./dspcap aks-je2029stblue-001 default"
exit 1
fi

set -e
set -o pipefail
STARTTIME=$(date -u +%Y-%m-%dT%H:%M)
PIDFILE=/var/run/dspcap.pid
NAMESPACE=default
NAMESPACE=$2
CONTEXT=$1

cat <<EOF | kubectl apply -f -
cat <<EOF | kubectl apply --context $CONTEXT --namespace $NAMESPACE -f -
apiVersion: apps/v1
kind: DaemonSet
metadata:
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20 changes: 14 additions & 6 deletions dspcap-stop
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@@ -1,4 +1,11 @@
#!/bin/bash

if [ $# -ne 2 ]; then
echo "./dspcap clustercontext k8snamespace"
echo "ex: ./dspcap aks-je2029stblue-001 default"
exit 1
fi

set -e
set -o pipefail
PIDFILE=/var/run/dspcap.pid
Expand All @@ -11,25 +18,26 @@ EOF
)"
TAR_COMMAND="cd /tmp && tar zvc dspcap"
DEL_COMMAND="rm -rf /tmp/dspcap"
NAMESPACE=default
NAMESPACE=$2
CONTEXT=$1

pods=`kubectl get po -n $NAMESPACE -l app=dspcap -o name`
pods=`kubectl get po --context $CONTEXT -n $NAMESPACE -l app=dspcap -o name`

for po in `echo "$pods"`; do
echo "run killing for $po"
kubectl exec -n $NAMESPACE "$po" -- bash -c "$KILL_COMMAND"
kubectl exec --context $CONTEXT -n $NAMESPACE "$po" -- bash -c "$KILL_COMMAND"
done

for po in `echo "$pods"`; do
echo "downloading for $po"
kubectl exec -n $NAMESPACE "$po" -- bash -c "$TAR_COMMAND" | tar zvx
kubectl exec --context $CONTEXT -n $NAMESPACE "$po" -- bash -c "$TAR_COMMAND" | tar zvx
done

for po in `echo "$pods"`; do
echo "cleanup for $po"
kubectl exec -n $NAMESPACE "$po" -- bash -c "$DEL_COMMAND"
kubectl exec --context $CONTEXT -n $NAMESPACE "$po" -- bash -c "$DEL_COMMAND"
done

kubectl delete -n $NAMESPACE ds/dspcap
kubectl delete --context $CONTEXT -n $NAMESPACE ds/dspcap

echo "All done, cheers."