A shell script to fetch logs for Kubernetes pods based on the beginning of their names and an optional namespace.

k8s_logs.sh

#!/bin/bash

if [ "$#" -lt 1 ] || [ "$#" -gt 2 ]; then
  echo "Usage: $0 <container-name-start> [namespace]"
  exit 1
fi

container_name_start="$1"
namespace_flag=""

if [ "$#" -eq 2 ]; then
  namespace="$2"
  namespace_flag="--namespace=$namespace"
fi

pods=$(kubectl get pods $namespace_flag --no-headers -o custom-columns=":metadata.name")

for pod in $pods; do
  if [[ $pod == $container_name_start* ]]; then
    echo "Fetching logs for pod: $pod"
    kubectl logs $namespace_flag "$pod"
  fi
done

Example Usage:
./get_logs.sh <pod-name-start> [<optional-namespace>]

<pod-name-start>: The beginning of the pod name you want to fetch logs for.
[<optional-namespace>]: (Optional) The specific namespace where the pod is located. If not provided, the script will use the current namespace.