Run node.js app as a systemd service

install-node-app.sh

#!/bin/bash

SERVICE_NAME=$1
DOMAIN_NAME=$2
HTTP_PORT=$3
SERVICE_USER=${4:-www-data}
DEPLOY_KEY=$5
NODE_ENV=${6:-production}

DEPLOY_USER="deploy"

show_info () {
    echo "Usage: $0 <service-name> <domain> <http-port> <service-user> <ssh-key> <node-env>"
    echo "Where"
    echo " <service-name> is the name of the service (required)"
    echo " <http-port> is the port to bind to (required)"
    echo " <domain> is the domain name of the service"
    echo " <service-user> is optional useraname for the service (defaults to www-data)"
    echo " <ssh-key> Optional SSH public key for the deploy user"
    echo " <node-env> is optional node env for the service (defaults to production)"
}

if [[ -z $SERVICE_NAME ]]; then
    show_info
    exit
fi

if [[ -z $HTTP_PORT ]]; then
    show_info
    exit
fi

apt-get update
apt-get -q -y install lsb-release curl git nginx

NODEREPO="node_16.x"
CODENAME=`lsb_release -c -s`

# Install Node.js
if ! [ -x "$(command -v node)" ]; then
    "Installing Node.js"
    curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
    echo "deb https://deb.nodesource.com/$NODEREPO $CODENAME main" > /etc/apt/sources.list.d/nodesource.list
    echo "deb-src https://deb.nodesource.com/$NODEREPO $CODENAME main" >> /etc/apt/sources.list.d/nodesource.list
    apt-get update
    apt-get -q -y install nodejs
fi

# Ensure deploy user
if id "$DEPLOY_USER" >/dev/null 2>&1; then
    echo "User $DEPLOY_USER already exists"
else
    echo "Creating user $DEPLOY_USER"
    useradd -s /bin/bash $DEPLOY_USER
    mkdir -p /home/$DEPLOY_USER/.ssh
    touch /home/$DEPLOY_USER/.ssh/authorized_keys
    chown -R $DEPLOY_USER:$DEPLOY_USER /home/$DEPLOY_USER
fi

if [[ ! -z $DEPLOY_KEY ]]; then
    if [ -f "/home/$DEPLOY_USER/.ssh/authorized_keys" ]; then
        if grep -Fxq "$DEPLOY_KEY" "/home/$DEPLOY_USER/.ssh/authorized_keys"
        then
            echo "Key already exists in /home/$DEPLOY_USER/.ssh/authorized_keys"
        else
            echo $DEPLOY_KEY >> "/home/$DEPLOY_USER/.ssh/authorized_keys"
        fi
    else
        echo "SSH key file not found for $DEPLOY_USER"
    fi
fi

# Ensure service user
if id "$SERVICE_USER" >/dev/null 2>&1; then
    echo "User $SERVICE_USER already exists"
else
    echo "Creating user $SERVICE_USER"
    useradd --system $SERVICE_USER
fi


# just in case the service already exists
systemctl stop $SERVICE_NAME 2>/dev/null || true
systemctl disable $SERVICE_NAME 2>/dev/null || true
systemctl daemon-reload

# delete old version if exists
rm -rf "/opt/${SERVICE_NAME}"
rm -rf "/var/opt/${SERVICE_NAME}.git"
rm -rf "/var/log/${SERVICE_NAME}"
rm -rf "/etc/systemd/system/${SERVICE_NAME}.service"
rm -rf "/etc/rsyslog.d/25-${SERVICE_NAME}.conf"
rm -rf "/etc/logrotate.d/${SERVICE_NAME}"
rm -rf "/etc/tmpfiles.d/${SERVICE_NAME}.conf"

mkdir -p "/opt/$SERVICE_NAME"
mkdir -p "/var/opt/${SERVICE_NAME}.git"

cd "/var/opt/${SERVICE_NAME}.git"
git init --bare

cat > "/var/opt/${SERVICE_NAME}.git/hooks/update" <<EOM
#!/bin/bash

NAME="${SERVICE_NAME}"

GIT_WORK_TREE="/opt/\$NAME"
GIT_WORK_TREE="\$GIT_WORK_TREE" git checkout "\$3" -f

cd "\$GIT_WORK_TREE"

if [ -f package.json ]; then
    echo Installing npm packages
    rm -rf package-lock.json
    npm install --production --progress=false
else
    echo npm package file not found
fi

sudo /bin/systemctl restart "\$NAME"

echo "Deployment complete"
EOM

chmod +x "/var/opt/${SERVICE_NAME}.git/hooks/update"

# add sudo rights for deploy user
echo "$DEPLOY_USER ALL = (root) NOPASSWD: /bin/systemctl start $SERVICE_NAME
$DEPLOY_USER ALL = (root) NOPASSWD: /bin/systemctl restart $SERVICE_NAME" > "/etc/sudoers.d/$SERVICE_NAME"

# Setup systemd service
cat > "/etc/systemd/system/${SERVICE_NAME}.service" <<EOM
[Unit]
Description=PostalSys ${SERVICE_NAME}
After=network.target

[Service]

Environment="HTTP_PORT=$HTTP_PORT"
Environment="NODE_CONFIG_PATH=/etc/${SERVICE_NAME}/${SERVICE_NAME}.toml"
Environment="NODE_ENV=production"

WorkingDirectory=/opt/${SERVICE_NAME}
User=$SERVICE_USER
Group=$SERVICE_USER

ExecStart=/usr/bin/npm start
ExecReload=/bin/kill -HUP $MAINPID

Type=simple
Restart=always

SyslogIdentifier=${SERVICE_NAME}

[Install]
WantedBy=multi-user.target
EOM

# Ensure required files and permissions
echo "d /var/log/${SERVICE_NAME} 0750 syslog adm
d /opt/${SERVICE_NAME} 0755 $DEPLOY_USER $DEPLOY_USER
d /var/opt/${SERVICE_NAME}.git 0755 $DEPLOY_USER $DEPLOY_USER
d /etc/${SERVICE_NAME} 0750 $SERVICE_USER $SERVICE_USER
f /etc/${SERVICE_NAME}/${SERVICE_NAME}.toml 0600 $SERVICE_USER $SERVICE_USER" > "/etc/tmpfiles.d/${SERVICE_NAME}.conf"

# Redirect log output from syslog to log file
echo "if ( \$programname startswith \"$SERVICE_NAME\" ) then {
    action(type=\"omfile\" file=\"/var/log/${SERVICE_NAME}/${SERVICE_NAME}.log\")
    stop
}" > "/etc/rsyslog.d/25-${SERVICE_NAME}.conf"

# Setup log rotate
echo "/var/log/${SERVICE_NAME}/${SERVICE_NAME}.log {
    daily
    ifempty
    missingok
    rotate 7
    compress
    create 640 syslog adm
    su root root
    sharedscripts
    postrotate
        systemctl kill --signal=SIGHUP --kill-who=main rsyslog.service 2>/dev/null || true
    endscript
}" > "/etc/logrotate.d/${SERVICE_NAME}"

mkdir -p "/etc/${SERVICE_NAME}"
touch "/etc/${SERVICE_NAME}/${SERVICE_NAME}.toml"

# Run tmpfiles definitions to ensure required directories/files
systemd-tmpfiles --create --remove

# Restart rsyslog for the changes to take effect
systemctl restart rsyslog

# create dummy app
echo 'const http = require("http");
const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader("Content-Type", "text/plain");
  res.end("Hello World");
});
server.listen(' $HTTP_PORT ', () => {
  console.log("Server listening on port %s", server.address().port);
});' > "/opt/${SERVICE_NAME}/server.js"

cat > "/opt/${SERVICE_NAME}/package.json" <<EOM
{
  "name": "$SERVICE_NAME",
  "private": true,
  "version": "1.0.0",
  "scripts": {
    "start": "node server.js"
  }
}
EOM

chown -R $DEPLOY_USER:$DEPLOY_USER "/opt/${SERVICE_NAME}"
chown -R $DEPLOY_USER:$DEPLOY_USER "/var/opt/${SERVICE_NAME}.git"

systemctl enable ${SERVICE_NAME}.service
# start the dummy HTTP service
systemctl restart ${SERVICE_NAME}.service

if [[ ! -z $DOMAIN_NAME ]]; then

    cd ~

    if [ ! -f /etc/ssl/certs/${DOMAIN_NAME}-fullchain.pem ]; then

        # generate dummy certificate
        openssl req -subj "/CN=${DOMAIN_NAME}/O=Postal Systems./C=EE" -new -newkey rsa:2048 -days 365 -nodes -x509 -keyout privkey.pem -out fullchain.pem
        chmod 0600 privkey.pem

        mv privkey.pem /etc/ssl/private/${DOMAIN_NAME}-privkey.pem
        mv fullchain.pem /etc/ssl/certs/${DOMAIN_NAME}-fullchain.pem
    fi

    # generate nginx config
    cat > "/etc/nginx/sites-available/${DOMAIN_NAME}.conf" <<EOM
server {
    listen 80;
    listen [::]:80;
    listen 443 ssl http2;
    listen [::]:443 ssl http2;

    server_name ${DOMAIN_NAME};

    ssl_certificate_key /etc/ssl/private/${DOMAIN_NAME}-privkey.pem;
    ssl_certificate /etc/ssl/certs/${DOMAIN_NAME}-fullchain.pem;
    #ssl_trusted_certificate /etc/ssl/certs/${DOMAIN_NAME}-chain.pem;

    location / {
        client_max_body_size 50M;
        proxy_http_version 1.1;
        proxy_redirect off;
        proxy_set_header X-Real-IP \$remote_addr;
        proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto https;
        proxy_set_header X-Scheme \$scheme;
        proxy_set_header Host \$http_host;
        proxy_set_header X-NginX-Proxy true;
        proxy_pass http://127.0.0.1:$HTTP_PORT;
    }

    # enforce HTTPS
    if (\$scheme != "https") {
        return 301 https://\$host\$request_uri;
    }
}
EOM

    # activate website
    ln -s "/etc/nginx/sites-available/${DOMAIN_NAME}.conf" "/etc/nginx/sites-enabled/${DOMAIN_NAME}.conf"

    nginx -t && systemctl reload nginx

    #create certificate script
    if ! [ -x "$(command -v /root/.acme.sh/acme.sh)" ]; then
        # install acme.sh
        curl https://get.acme.sh | sh -s [email protected]    
    fi

    # create helper script to generate valid certificate using Let's Encrypt
    cat > "certs-${DOMAIN_NAME}.sh" <<EOM
#!/bin/bash
/root/.acme.sh/acme.sh --issue --nginx --server letsencrypt \\
    -d ${DOMAIN_NAME} \\
    --key-file       /etc/ssl/private/${DOMAIN_NAME}-privkey.pem  \\
    --ca-file        /etc/ssl/certs/${DOMAIN_NAME}-chain.pem \\
    --fullchain-file /etc/ssl/certs/${DOMAIN_NAME}-fullchain.pem \\
    --reloadcmd     "/bin/systemctl reload nginx" \\
    --force
EOM

    chmod +x "certs-${DOMAIN_NAME}.sh"

    echo "Run ~/certs-${DOMAIN_NAME}.sh to activate Let's Encrypt certificate for ${DOMAIN_NAME}"

fi

remove-node-app.sh

#!/bin/bash

SERVICE_NAME=$1
DOMAIN_NAME=$2

DEPLOY_USER="deploy"

show_info () {
    echo "Usage: $0 <service-name> <domain>"
    echo "Where"
    echo " <service-name> is the name of the service (required)"
    echo " <domain> is the domain name of the service"
}

if [[ -z $SERVICE_NAME ]]; then
    show_info
    exit
fi

systemctl stop $SERVICE_NAME
systemctl disable $SERVICE_NAME

rm -rf "/opt/${SERVICE_NAME}"
rm -rf "/var/opt/${SERVICE_NAME}.git"
rm -rf "/var/log/${SERVICE_NAME}"
rm -rf "/etc/systemd/system/${SERVICE_NAME}.service"
rm -rf "/etc/rsyslog.d/25-${SERVICE_NAME}.conf"
rm -rf "/etc/logrotate.d/${SERVICE_NAME}"
rm -rf "/etc/tmpfiles.d/${SERVICE_NAME}.conf"

systemctl daemon-reload

if [[ ! -z $DOMAIN_NAME ]]; then
    rm -rf "/etc/nginx/sites-available/${DOMAIN_NAME}.conf"
    rm -rf "/etc/nginx/sites-enabled/${DOMAIN_NAME}.conf"
    nginx -t && systemctl reload nginx
fi