Get container ip within a docker network.

docker-container-ip.sh

docker_container_ip() {
    containerName=$1
    [[ -z "$1" ]] && {
        echo "Please pass container name!"
        exit 1
    }

    # Default docker network
    networkName="mysql-db"
    if [[ -n "$2" ]]; then
       networkName=$2
    fi

    # https://github.com/moby/moby/issues/35886
    gotemplate="{{  \$network := index .NetworkSettings.Networks \"${networkName}\" }}{{ \$network.IPAddress }}"
    docker inspect --format "${gotemplate}" $containerName
}