Check docker logs for matching keywords - can be used to alert ant

check_docker_error.sh

#!/bin/bash

# Initialize empty variables
CONTAINER=""
ERROR_KEYWORDS=""

# Parse arguments using flags
while [ "$1" != "" ]; do
    case $1 in
        -container ) shift
                     CONTAINER=$1
                     ;;
        -keywords )  shift
                     ERROR_KEYWORDS=$1
                     ;;
        * )          echo "Usage: $0 -container <container_name> -keywords <error_keywords>"
                     exit 3  # UNKNOWN status
    esac
    shift
done

# Print the received arguments for debugging (optional)
echo "Container: $CONTAINER"
echo "Keywords: $ERROR_KEYWORDS"

# Check if both required arguments are provided
if [ -z "$CONTAINER" ] || [ -z "$ERROR_KEYWORDS" ]; then
  echo "Usage: $0 -container <container_name> -keywords <error_keywords>"
  exit 3  # UNKNOWN status
fi

# Fetch the logs from the last 5 minutes
LOGS=$(docker logs --since 5m "$CONTAINER" 2>&1)

# Search the logs for the specified error keywords
ERROR_LOGS=$(echo "$LOGS" | grep -iE "$ERROR_KEYWORDS")

# If we found any errors in the logs
if [ ! -z "$ERROR_LOGS" ]; then
  echo "CRITICAL: Errors found in container logs for $CONTAINER"
  echo "$ERROR_LOGS"
  exit 2  # CRITICAL status
else
  echo "OK: No errors found in container logs for $CONTAINER"
  exit 0  # OK status
fi