Run Redis in Docker and monitor every Redis command received in real-time

redis_dev.sh

#!/bin/bash

# Usage: ./redis_dev.sh
# Description: spawn a Redis instance in a background Docker container, and show the logs
# of each Redis command received in real-time. Hitting Ctrl+C will terminate the process and
# kill the Docker container used by the script.

set -e

# Edit this variables accordingly to your use case
DOCKER_IMAGE="redis:6.2.2-alpine"
HOST_PORT=6379
CONTAINER_PORT=6379
REDIS_PASSWORD=""

# Run Redis on a background Docker instance, and expose it on localhost:${HOST_PORT}
echo "Preparing to run Redis on localhost:${HOST_PORT}..."
CONTAINER_ID=$(docker run -p ${HOST_PORT}:${CONTAINER_PORT} -d ${DOCKER_IMAGE})
echo "Created Docker container ${CONTAINER_ID}"
echo "Redis is running on localhost:${HOST_PORT}"

# on Ctrl+C, call unmount()
trap unmount SIGINT

# Unmount the docker image of 
function unmount() {
  # Stop the Redis container spawned previously
  echo ""
  echo "Closing Docker container ${CONTAINER_ID}..."
  docker stop "${CONTAINER_ID}" > /dev/null
}

# Login into Redis in a background process and log the commands sent to it in real-time
echo "Attaching to redis-cli on localhost:${HOST_PORT}..."
docker exec -t "${CONTAINER_ID}" redis-cli \
  --no-auth-warning -a "${REDIS_PASSWORD}" \
  MONITOR &
echo "Attached to redis-cli on localhost:${HOST_PORT}"

# Save the PID of the of the background Redis logger process
CONT_PID=$!

# Show the stdout of the background Redis logger process in real-time
cat /proc/${CONT_PID}/fd/1

wait ${CONT_PID}