all-logs.sh

#!/usr/bin/env bash

# This script get all logs from all containers in the namespace
# Usage
# ./all-logs.sh -n [namespace] -s [hours]

# parse args
while getopts ":n:s:" opt; do
  case $opt in
    n) namespace="$OPTARG"
    ;;
    s) since="$OPTARG"
    ;;
    \?) echo "Invalid option -$OPTARG" >&2
    ;;
  esac
done


# set namespace we want search in
ENV="${namespace:-default}"

# set how far in past we want to search logs
LOGS_SINCE="${since:-24}h"

# set tmp folder for logs
LOGS_TMP="$(mktemp -d -t namespace-logs-XXXXX)"

# print initial message
echo "Searching logs since ${LOGS_SINCE} in namespace ${ENV}"

# get all pods
for pod in $(kubectl get pods -n "${ENV}" --no-headers -o=custom-columns=NAME:.metadata.name); do
    # get all containers in pods
    for container in $(kubectl get pods -n "${ENV}" -o jsonpath='{.spec.containers[*].name}' "$pod"); do
        echo "Obtaining logs from: ${pod}/${container}. Saving to: ${LOGS_TMP}/${pod}_${container}.log";
        kubectl logs -n "${ENV}" --since="${LOGS_SINCE}" -c "${container}" "${pod}" > "${LOGS_TMP}/${pod}_${container}.log"
    done;
done