Install and configure journald-cloudwatch-logs on EC2

journald-cloudwatch-logs.sh

# https://github.com/saymedia/journald-cloudwatch-logs
function install_journald_cloudwatch_logs() {
  cd /tmp/ || return
  wget https://github.com/saymedia/journald-cloudwatch-logs/releases/download/v0.0.1/journald-cloudwatch-logs-linux.zip
  unzip journald-cloudwatch-logs-linux.zip
  mv journald-cloudwatch-logs/journald-cloudwatch-logs /usr/local/bin/journald-cloudwatch-logs
  mkdir -p /var/lib/journald-cloudwatch-logs
  touch /var/lib/journald-cloudwatch-logs/state
  chown ec2-user:ec2-user /var/lib/journald-cloudwatch-logs/state
}

function create_journald_cloudwatch_logs_conf() {
  cat << 'EOF' > /usr/local/etc/journald-cloudwatch-logs.conf
log_group = "${log_group_name}"
state_file = "/var/lib/journald-cloudwatch-logs/state"
EOF
  chown ec2-user:ec2-user /usr/local/etc/journald-cloudwatch-logs.conf
}

function create_journald_cloudwatch_logs_systemd() {
  cat << 'EOF' > /etc/systemd/system/journald-cloudwatch.service
[Unit]
Description=journald-cloudwatch-logs
Wants=basic.target
After=basic.target network.target

[Service]
User=ec2-user
Group=ec2-user
ExecStart=/usr/local/bin/journald-cloudwatch-logs /usr/local/etc/journald-cloudwatch-logs.conf
KillMode=process
Restart=on-failure
RestartSec=42s
EOF
}

function start_journald_cloudwatch_logs() {
  echo "Install journald-cloudwatch"
  install_journald_cloudwatch_logs

  echo "Creating journald-cloudwatch-logs.conf"
  create_journald_cloudwatch_logs_conf

  echo "Creating journald-cloudwatch-logs systemd unit file"
  create_journald_cloudwatch_logs_systemd

  echo "Enable journald-cloudwatch at boot via systemd"
  systemctl daemon-reload
  systemctl enable journald-cloudwatch

  echo "Starting journald-cloudwatch"
  systemctl start journald-cloudwatch
}