Setup PhpMyAdmin with Cloud SQL on Compute Engine

In this post, I will guide you to install PHPMyAdmin on a Compute Engine VM Instance and connect it to Cloud SQL.

Prerequisites

1. Your Compute Engine Instance running.
2. For setting up Compute Engine, see the Setting up Compute Engine Instance.
3. For installing Nginx and PHP, see how to install LEMP in Compute Engine Instance.
4. Google Cloud SQL Setup, see Setup Cloud SQL and connect with Compute Engine.

Make sure your VM Instance IP address is static and authorized for connections in Cloud SQL

Setup your website

Your website will be located in the home directory and have the following structure

Replace yourdomainname.com with your original domain name.

home
-- yourdomainname.com
---- logs
---- public

The public directory is your website’s root directory and logs directory for your error logs

Now we create these directories and set correct permissions

You need to SSH into your VM Instance and run these commands

mkdir -p yourdomainname.com/logs yourdomainname.com/public
sudo chmod -R 755 yourdomainname.com

NGINX Set up

Now create a new Nginx configuration for your website in the sites-available directory

sudo nano /etc/nginx/sites-available/yourdomainname.com

Copy and paste the following configuration, ensure that you change the server_name, error_log and root directives to match your domain name. Hit CTRL+X followed by Y to save the changes.

server {
    listen 80;
    listen [::]:80;

    server_name yourdomainname.com www.yourdomainname.com;

    error_log /home/username/yourdomainname.com/logs/error.log;

    root /home/username/yourdomainname.com/public/;
    index index.html index.php;

    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ .php$ {
        try_files $uri =404;
        fastcgi_split_path_info ^(.+.php)(/.+)$;
        fastcgi_pass unix:/run/php/php7.2-fpm.sock;
        fastcgi_index index.php;
        include fastcgi_params;
    }
}

To enable this newly created website configuration, symlink the file that you just created into the sites-enabled directory.

sudo ln -s /etc/nginx/sites-available/yourdomainname.com /etc/nginx/sites-enabled/yourdomainname.com

Check your configuration and restart Nginx for the changes to take effect

sudo nginx -t
sudo service nginx restart

Create SSL certificate and enable HTTP/2

HTTPS
HTTPS is a protocol for secure communication between a server (instance) and a client (web browser). Due to the introduction of Let’s Encrypt, which provides free SSL certificates, HTTPS are adopted by everyone and also provides trust to your audiences.

HTTP/2
HTTP/2 is the latest version of the HTTP protocol and can provide a significant improvement to the load time of your sites. There really is no reason not to enable HTTP/2, the only requirement is that the site must use HTTPS.

sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update
sudo apt-get install python-certbot-nginx

Now we have installed Certbot by Let’s Encrypt for Ubuntu 18.04, run this command to receive your certificates.

sudo certbot --nginx certonly

Enter your email and agree to the terms and conditions, then you will receive the list of domains you need to generate SSL certificate.

To select all domains simply hit Enter

The Certbot client will automatically generate the new certificate for your domain. Now we need to update the Nginx config.

Redirect HTTP Traffic to HTTPS with www in Nginx

Open your site’s Nginx configuration file add replace everything with the following. Replacing the file path with the one you received when obtaining the SSL certificate. The ssl_certificate directive should point to your fullchain.pem file, and the ssl_certificate_key directive should point to your privkey.pem file.

server {
    listen [::]:80;
    listen 80;

    server_name yourdomainname.com www.yourdomainname.com;
    # redirect http to https www
    return 301 https://www.yourdomainname.com$request_uri;
}

server {
    listen [::]:443 ssl http2;
    listen 443 ssl http2;

    server_name yourdomainname.com;

    ssl_certificate /etc/letsencrypt/live/yourdomainname.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/yourdomainname.com/privkey.pem;

    root /home/username/yourdomainname.com/public/;
    index index.html index.php;

    # redirect https non-www to https www
    return 301 https://www.yourdomainname.com$request_uri;
}

server {
    listen [::]:443 ssl http2;
    listen 443 ssl http2;

    server_name www.yourdomainname.com;

    ssl_certificate /etc/letsencrypt/live/yourdomainname.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/yourdomainname.com/privkey.pem;

    error_log /home/username/yourdomainname.com/logs/error.log;

    root /home/username/yourdomainname.com/public/;
    index index.html index.php;

    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ .php$ {
        try_files $uri =404;
        fastcgi_split_path_info ^(.+.php)(/.+)$;
        fastcgi_pass unix:/run/php/php7.2-fpm.sock;
        fastcgi_index index.php;
        include fastcgi_params;

        add_header Content-Security-Policy "img-src * 'self' data: blob: https:; default-src 'self' https://*.googleapis.com https://*.googletagmanager.com https://*.google-analytics.com https://s.ytimg.com https://www.youtube.com https://www.yourdomainname.com https://*.googleapis.com https://*.gstatic.com https://*.gravatar.com https://*.w.org data: 'unsafe-inline' 'unsafe-eval';" always;
        add_header X-Xss-Protection "1; mode=block" always;
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header Access-Control-Allow-Origin "https://www.yourdomainname.com";
        add_header Referrer-Policy "origin-when-cross-origin" always;
        add_header Strict-Transport-Security "max-age=31536000; includeSubdomains; preload";
    }
}

The http2 value is all that is needed to enable the HTTP/2 protocol.

Now you have enabled SSL Hardening, created a Content Security Policy, X-XSS-Protection, Clickjacking, MIME Sniffing, Referrer Policy, Access Control Allow Origin.

These are some Nginx security tweaks by closing all areas of attacks.

Hit CTRL+X followed by Y to save the changes.

Check your configuration and restart Nginx for the changes to take effect.

sudo nginx -t
sudo service nginx restart

Renewing SSL Certificate

Certificates provided by Let’s Encrypt are valid for 90 days only, so you need to renew them often. Now you set up a cronjob to check for the certificate which is due to expire in next 30 days and renew it automatically.

sudo crontab -e

Add this line at the end of the file

0 0,12 * * * certbot renew >/dev/null 2>&1

Hit CTRL+X followed by Y to save the changes.

This cronjob will attempt to check for renewing the certificate twice daily.

Download & Install PHPMyAdmin

Go to Compute Engine >> VM Instances and click the SSH button in your Instance to open the terminal in a new browser window

Once you are in SSH execute the following commands to download and install PHPMyAdmin

cd /usr/share
wget https://files.phpmyadmin.net/phpMyAdmin/4.8.3/phpMyAdmin-4.8.3-all-languages.zip
sudo unzip phpMyAdmin-4.8.3-all-languages.zip
sudo mv phpMyAdmin-4.8.3-all-languages phpmyadmin
sudo rm -f phpMyAdmin-4.8.3-all-languages.zip
sudo mkdir tmp
sudo chmod -R 777 tmp

Now PHPMyAdmin is installed and tmp directory is configured for cache

Configure PHPMyAdmin for Cloud SQL

Now create a configuration file and add the details of your Cloud SQL Instance

cd phpmyadmin
sudo cp config.sample.inc.php config.inc.php
sudo nano config.inc.php

In your web browser open the blowfish secret generator

Copy the generated blowfish secret (Be careful to copy the generated not the example)

Now paste it in the $cfg['blowfish_secret']

Next, update the Server Configuration with the below. Make sure you replace the CLOUD_SQL_INSTANCE_IP_ADDRESS with your Cloud SQL Instance IP address

$i++;
$cfg['Servers'][$i]['verbose'] = 'Google Cloud SQL';
$cfg['Servers'][$i]['host'] = 'CLOUD_SQL_INSTANCE_IP_ADDRESS';
$cfg['Servers'][$i]['port'] = '3306';
$cfg['Servers'][$i]['socket'] = '';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['extension'] = 'mysqli';
$cfg['Servers'][$i]['auth_type'] = 'cookie';
$cfg['Servers'][$i]['AllowNoPassword'] = false;
$cfg['Servers'][$i]['ssl'] = true;
$cfg['Servers'][$i]['ssl_key'] = '/etc/letsencrypt/live/yourdomainname.com/privkey.pem';
$cfg['Servers'][$i]['ssl_cert'] = '/etc/letsencrypt/live/yourdomainname.com/fullchain.pem';
$cfg['Servers'][$i]['ssl_verify'] = false;
$cfg['TempDir'] = '/usr/share/tmp';

Hit Ctrl+X followed by Y to save the file

Symlink the phpmyadmin folder to your web root directory

sudo ln -s /usr/share/phpmyadmin /home/username/yourdomainname.com/public

Now visit your domain name in the bowser followed by phpmyadmin (https://www.yourdomainname.com/phpmyadmin/).

Enter username as root and password that you set in Cloud SQL for the root user.

Now you can use PHPMyAdmin to manage your Google Cloud SQL