gen-systemd-cloudwatch.sh

#!/usr/bin/env bash
set -e

main() {
  local service_name="${1:-systemd-cloudwatch}"
  local group_name="${2:-vineview}"
  local filter_unit="${3}"

  [ -z "${service_name}" ] && usage

  local final_dir="$HOME/${service_name}"

  if [ -d "${final_dir}" ]; then
    echo "${final_dir} already exists, exiting."
    exit 1
  fi

  local service_file="sst.${service_name}.service"

  mkdir -p \
    "${final_dir}" \
    "${final_dir}/data"

  docker-compose-config > "${final_dir}/docker-compose.yml"
  env-file > "${final_dir}/env"
  systemd-cloudwatch-config "${group_name}" "${filter_unit}" > "${final_dir}/data/systemd-cloud-watch.conf"
  systemd-service "${final_dir}" > "${final_dir}/${service_file}"

  if [ ! -f "/etc/systemd/system/${service_file}" ]; then
    sudo cp "${final_dir}/${service_file}" /etc/systemd/system/
    sudo systemctl daemon-reload
    sudo systemctl enable "${service_file}"
    sudo systemctl start "${service_file}"
  fi
}

usage() {
  echo "$0 service_name [group_name] [filter_unit]"
  exit 1
}

docker-compose-config() {
  echo "
main:
  image: marcogroppo/systemd-cloud-watch
  command: /conf/systemd-cloud-watch.conf
  env_file: env
  volumes:
    - ./data/systemd-cloud-watch.conf:/conf/systemd-cloud-watch.conf:ro
    - /var/log/journal:/var/log/journal:ro
    - /run/log/journal:/run/log/journal:ro
"
}

env-file() {
  echo "
AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID}
AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY}
"
}

systemd-cloudwatch-config() {
  echo "
log_group = \"$1\"
aws_region = \"us-east-1\"
tail = true
"

  if [ -n "$2" ]; then
    echo "filters = [\"_SYSTEMD_UNIT=$2\"]"
  fi
}

systemd-service() {
  echo "
[Unit]
Description=Systemd CloudWatch
After=docker.service
Requires=docker.service

[Service]
User=ubuntu
WorkingDirectory=$1
ExecStartPre=/usr/local/bin/docker-compose-pre-start
ExecStart=/usr/local/bin/docker-compose-start
TimeoutStartSec=0
Restart=always

[Install]
WantedBy=multi-user.target
"
}

main "$@"