This tutorial is going to show you how to install LEMP stack (Nginx, MariaDB, and PHP7.4) on Ubuntu 20.04. A software stack is a set of software tools bundled together. LEMP stands for Linux, Nginx (Engine-X), MariaDB/MySQL and PHP, all of which are open source and free to use. It is the most common software stack that powers dynamic websites and web applications. Linux is the operating system; Nginx is the web server; MariaDB/MySQL is the database server and PHP is the server-side scripting language responsible for generating dynamic web pages.
Prerequisites
To follow this tutorial, you need an Ubuntu 20.04 OS running on your local computer or on a remote server.
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Step 1: Update Software Packages
Before we install the LEMP stack, it’s a good practice to update repository and software packages by running the following commands on your Ubuntu 20.04 OS.
sudo apt update sudo apt upgrade
Step 2: Install Nginx Web Server
Nginx is a high-performance web server and very popular these days. It also can be used as a reverse proxy and caching server. Enter the following command to install Nginx Web server.
sudo apt install nginx
After it’s installed, we can enable Nginx to auto-start at boot time by running the following command.
sudo systemctl enable nginx
Then start Nginx with this command:
sudo systemctl start nginx
Now check out its status.
sudo systemctl status nginx
Output:
● nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2020-04-10 14:11:43 UTC; 3s ago
Docs: man:nginx(8)
Process: 8533 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
Process: 8545 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
Main PID: 8549 (nginx)
Tasks: 3 (limit: 9451)
Memory: 3.9M
CGroup: /system.slice/nginx.service
├─8549 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
├─8550 nginx: worker process
└─8551 nginx: worker process
“Enabled” indicates that auto-start at boot time is enabled and we can see that Nginx is running. You can also see how much RAM Nginx is using from the output. If the above command doesn’t immediately quit after running. You need to press “q” to make it quit.
Check Nginx version.
nginx -v
Output:
nginx version: nginx/1.17.9 (Ubuntu)
Now type in the public IP address of your Ubuntu 20.04 server in the browser address bar. You should see the “Welcome to Nginx” Web page, which means Nginx Web server is running properly. If you are installing LEMP on your local Ubuntu 20.04 computer, then type 127.0.0.1 or localhost in the browser address bar.
If the connection is refused or failed to complete, there might be a firewall preventing incoming requests to TCP port 80. If you are using iptables firewall, then you need to run the following command to open TCP port 80.
sudo iptables -I INPUT -p tcp --dport 80 -j ACCEPT
If you are using UFW firewall, then run this command to open TCP port 80.
sudo ufw allow http
Finally, we need to make www-data (Nginx user) as the owner of web directory. By default, it’s owned by the root user.
sudo chown www-data:www-data /usr/share/nginx/html -R
Step 3: Install MariaDB Database Server
MariaDB is a drop-in replacement for MySQL. It is developed by former members of MySQL team who are concerned that Oracle might turn MySQL into a closed-source product. Enter the following command to install MariaDB on Ubuntu 20.04.
sudo apt install mariadb-server mariadb-client
After it’s installed, MariaDB server should be automatically stared. Use systemctl to check its status.
systemctl status mariadb
Output:
● mariadb.service - MariaDB 10.3.22 database server
Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2020-04-10 14:19:16 UTC; 18s ago
Docs: man:mysqld(8)
https://mariadb.com/kb/en/library/systemd/
Main PID: 9161 (mysqld)
Status: "Taking your SQL requests now..."
Tasks: 31 (limit: 9451)
Memory: 64.7M
CGroup: /system.slice/mariadb.service
└─9161 /usr/sbin/mysqld
If it’s not running, start it with this command:
sudo systemctl start mariadb
To enable MariaDB to automatically start at boot time, run
sudo systemctl enable mariadb
Now run the post installation security script.
sudo mysql_secure_installation
When it asks you to enter MariaDB root password, press Enter key as the root password isn’t set yet. Then enter y to set the root password for MariaDB server.
Next, you can press Enter to answer all remaining questions, which will remove anonymous user, disable remote root login and remove test database. This step is a basic requirement for MariaDB database security. (Notice that Y is capitalized, which means it is the default answer. )
By default, the MaraiDB package on Ubuntu uses unix_socket to authenticate user login, which basically means you can use username and password of the OS to log into MariaDB console. So you can run the following command to login without providing MariaDB root password.
sudo mariadb -u root
To exit, run
exit;
Check MariaDB server version information.
mariadb --version
As you can see, we have installed MariaDB 10.3.22.
mariadb Ver 15.1 Distrib 10.3.22-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
Step 4: Install PHP7.4
PHP7.4 is included in Ubuntu 20.04 repository and has a minor performance improvement over PHP7.3. Enter the following command to install PHP7.4 and some common extensions.
sudo apt install php7.4 php7.4-fpm php7.4-mysql php-common php7.4-cli php7.4-common php7.4-json php7.4-opcache php7.4-readline php7.4-mbstring php7.4-xml php7.4-gd php7.4-curl
PHP extensions are commonly needed for content management systems (CMS) like WordPress. For example, if your installation lacks php7.4-xml, then some of your WordPress site pages may be blank and you can find an error in Nginx error log like:
PHP message: PHP Fatal error: Uncaught Error: Call to undefined function xml_parser_create()
Installing these PHP extensions ensures that your CMS runs smoothly. Now start php7.4-fpm.
sudo systemctl start php7.4-fpm
Enable auto-start at boot time.
sudo systemctl enable php7.4-fpm
Check status:
systemctl status php7.4-fpm
Sample output:
● php7.4-fpm.service - The PHP 7.4 FastCGI Process Manager
Loaded: loaded (/lib/systemd/system/php7.4-fpm.service; enabled; vendor pr>
Active: active (running) since Fri 2020-04-10 14:40:26 UTC; 12s ago
Docs: man:php-fpm7.4(8)
Process: 21019 ExecStartPost=/usr/lib/php/php-fpm-socket-helper install /ru>
Main PID: 21012 (php-fpm7.4)
Status: "Processes active: 0, idle: 2, Requests: 0, slow: 0, Traffic: 0req>
Tasks: 3 (limit: 9451)
Memory: 9.4M
CGroup: /system.slice/php7.4-fpm.service
├─21012 php-fpm: master process (/etc/php/7.4/fpm/php-fpm.conf)
├─21017 php-fpm: pool www
└─21018 php-fpm: pool www
If the above command doesn’t immediately quit after running. You need to press “q” to make it quit.
Step 5: Create an Nginx Server Block
An Nginx server block is like a virtual host in Apache. We will not use the default server block because it’s inadequate to run PHP code and if we modify it, it becomes a mess. So remove the default symlink in sites-enabled directory by running the following command. (It’s still available as /etc/nginx/sites-available/default.)
sudo rm /etc/nginx/sites-enabled/default
Then use a command-line text editor like Nano to create a brand new server block file under /etc/nginx/conf.d/ directory.
sudo nano /etc/nginx/conf.d/default.conf
Paste the following text into the file. The following snippet will make Nginx listen on IPv4 port 80 and IPv6 port 80 with a catch-all server name.
server {
listen 80;
listen [::]:80;
server_name _;
root /usr/share/nginx/html/;
index index.php index.html index.htm index.nginx-debian.html;
location / {
try_files $uri $uri/ /index.php;
}
location ~ \.php$ {
fastcgi_pass unix:/run/php/php7.4-fpm.sock;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
include snippets/fastcgi-php.conf;
}
# A long browser cache lifetime can speed up repeat visits to your page
location ~* \.(jpg|jpeg|gif|png|webp|svg|woff|woff2|ttf|css|js|ico|xml)$ {
access_log off;
log_not_found off;
expires 360d;
}
# disable access to hidden files
location ~ /\.ht {
access_log off;
log_not_found off;
deny all;
}
}
Save and close the file. (To save a file in Nano text editor, press Ctrl+O, then press Enter to confirm. To exit, press Ctrl+X.)
Then test Nginx configurations.
sudo nginx -t
If the test is successful, reload Nginx.
sudo systemctl reload nginx
Step 6: Test PHP
To test PHP-FPM with Nginx Web server, we need to create a info.php file in the webroot directory.
sudo nano /usr/share/nginx/html/info.php
Paste the following PHP code into the file.
<?php phpinfo(); ?>
Save and close the file. Now in the browser address bar, enter server-ip-address/info.php. Replace sever-ip-address with your actual IP. If you follow this tutorial on your local computer, then type 127.0.0.1/info.php or localhost/info.php.
You should see your server’s PHP information. This means PHP scripts can run properly with Nginx web server.
Congrats! You have successfully installed Nginx, MariaDB and PHP7.4 on Ubuntu 20.04. For your server’s security, you should delete info.php file now to prevent hacker seeing it.
sudo rm /usr/share/nginx/html/info.php
Troubleshooting Tip
If you encounter errors, you can check the Nginx error log (/var/log/nginx/error.log) to find out what’s wrong.
Nginx Automatic Restart
If for any reason your Nginx process is killed, you need to run the following command to restart it.
sudo systemctl restart nginx
Instead of manually typing this command, we can make Nginx automatically restart by editing the nginx.service systemd service unit. To override the default systemd service configuration, we create a separate directory.
sudo mkdir -p /etc/systemd/system/nginx.service.d/
Then create a file under this directory.
sudo nano /etc/systemd/system/nginx.service.d/restart.conf
Add the following lines in the file, which will make Nginx automatically restart 5 seconds after a failure is detected. The default value of RetartSec is 100ms, which is too small. Nginx may complain that “start request repeated too quickly” if RestartSec is not big enough.
[Service] Restart=always RestartSec=5s
Save and close the file. Then reload systemd for the changes to take effect.
sudo systemctl daemon-reload
To check if this would work, kill Nginx with:
sudo pkill nginx
Then check Nginx status. You will find Nginx automatically restarted.
sudo systemctl status nginx
