Check if a Redis container running on docker is OK by sending a PING to redis instance running in container

check_redis.sh

#! /bin/bash
#
# Check if a Redis container running on docker is OK
# by sending a PING to redis instance running in container

if [[ $# -eq 0 ]] ; then
    echo 'Send PING to redis instance running in docker container'
    echo 'It should return PONG+'
    echo 'Usage:'
    echo '    check_redis.sh container_name'
    exit 0
fi

CONTAINER_NAME=$1

CONTAINER_ID=$(docker ps | \
               grep $CONTAINER_NAME | \
               cut -d\  -f1)

echo "Container ID: $CONTAINER_ID"

CONTAINER_IP=$(docker inspect $CONTAINER_ID | \
                 awk '/"IPAddress": "[0-9]{1,3}/ {
                     gsub(/("|,)/, "", $2); print $2
                 }')

echo "PING redis @ $CONTAINER_IP"
echo $((printf "PING\r\n";) | nc $CONTAINER_IP 6379)