start-datadog.sh

#!/usr/bin/env bash
if [ -f env.sh ]; then
	. env.sh
fi
usage="$(basename "$0") [-h] [-A DD_API_KEY ][-p ip:port address of prometheus ] [-d configuration directory] [-e environment variable, multiple params are supported] [-D encapsulate docker param] -- Start a datadog agent inside a container"

while getopts ':hA:p:e:H:D:' option; do
	case "$option" in
	h)
		echo "$usage"
		exit
		;;
	A)
		DD_API_KEY=$OPTARG
		;;
	D)
		DOCKER_PARAM="$DOCKER_PARAM $OPTARG"
		;;
	H)
		hostname="$OPTARG"
		;;
	e)
		ENV_ARRAY+=("$OPTARG")
		;;
	d)
		CONF_DIR="$OPTARG"
		;;
	p)
		PROMIP="$OPTARG"
		;;
	l)
		DOCKER_PARAM="$DOCKER_PARAM --net=host"
		;;
	:)
		printf "missing argument for -%s\n" "$OPTARG" >&2
		echo "$usage" >&2
		exit 1
		;;
	\?)
		printf "illegal option: -%s\n" "$OPTARG" >&2
		echo "$usage" >&2
		exit 1
		;;
	esac
done

if [ -z "$DD_API_KEY" ]; then
	printf "\nDatagot API keys are not present, exiting.\n"
	exit 1
fi
if [ -z "$DATADOG_NAME" ]; then
	DATADOG_NAME="datadog-agent"
fi

docker container inspect $DATADOG_NAME >/dev/null 2>&1
if [ $? -eq 0 ]; then
	printf "\nSome of the monitoring docker instances ($DATADOG_NAME) exist. Make sure all containers are killed and removed. You can use kill-all.sh for that\n"
	exit 1
fi

group_args=()
is_podman="$(docker --help | grep -o podman)"
if [ ! -z "$is_podman" ]; then
	group_args+=(--userns=keep-id)
fi

if [ -z "$CONF_DIR" ]; then
	CONF_DIR="datadog_conf"
fi

for val in "${ENV_ARRAY[@]}"; do
	ENV_COMMAND="$ENV_COMMAND -e $val"
done

if [[ -z "${DOCKER_HOST}" ]]; then
	if [ ! -z "$is_podman" ]; then
		if [[ $(uname) == "Linux" ]]; then
			DOCKER_HOST=$(hostname -I | awk '{print $1}')
		elif [[ $(uname) == "Darwin" ]]; then
			DOCKER_HOST=$(ifconfig bridge0 | awk '/inet / {print $2}')
		fi
	else
		if [[ $(uname) == "Linux" ]]; then
			DOCKER_HOST=$(ip -4 addr show docker0 | grep -Po 'inet \K[\d.]+')
		elif [[ $(uname) == "Darwin" ]]; then
			DOCKER_HOST=$(ifconfig bridge0 | awk '/inet / {print $2}')
		fi
	fi
fi

if [[ $(uname) == "Linux" ]]; then
	readlink_command="readlink -f"
elif [[ $(uname) == "Darwin" ]]; then
	readlink_command="realpath "
fi

if [ -z "$hostname" ]; then
	hostname=$HOSTNAME
fi

mkdir -p $CONF_DIR/conf.d/prometheus.d
if [ ! -f $CONF_DIR/datadog.yaml ]; then
	cat >$CONF_DIR/datadog.yaml <<EOL
# datadog.yaml
process_config:
  enabled: true
  scrub_args: true
logs_enabled: true
confd_path: /conf.d
log_level: INFO
hostname: ${hostname}
EOL
fi
cat docs/source/procedures/datadog/conf.yaml | sed "s/IP:9090/$PROMIP/g" >$CONF_DIR/conf.d/prometheus.d/conf.yaml

CONF_DIR=$($readlink_command "$CONF_DIR")

docker run -d $DOCKER_PARAM ${DOCKER_LIMITS["datadog"]} -i \
	--name $DATADOG_NAME \
	--pid host -v $CONF_DIR/datadog.yaml:/etc/datadog-agent/datadog.yaml \
	-v $CONF_DIR/conf.d/:/conf.d \
	$ENV_COMMAND \
	-e DD_API_KEY="$DD_API_KEY" -e DD_CONTAINER_INCLUDE="" gcr.io/datadoghq/agent:latest