Installing Apache on Ubuntu or Debian provides a fast, standard way to host websites, reverse-proxy applications, or publish internal documentation from a well-supported web server.
On these distributions, the Apache2 package ships a systemd service named apache2 plus a configuration layout under /etc/apache2 that separates global settings, enabled modules, and enabled virtual hosts. Helper commands such as a2enmod, a2dismod, a2ensite, and a2enconf manage symlinks between /etc/apache2/*-available and /etc/apache2/*-enabled, while apache2ctl validates configuration and performs graceful restarts.
Configuration mistakes can prevent apache2 from starting, so syntax checks should run before any reload or restart. Exposing ports 80 and 443 may require firewall changes, and a default install is reachable locally before DNS and TLS are configured.
Steps to install and customize Apache on Ubuntu and Debian:
- Open a terminal with sudo privileges.
- Update the apt package index.
$ sudo apt update WARNING: apt does not have a stable CLI interface. Use with caution in scripts. Hit:1 http://ports.ubuntu.com/ubuntu-ports noble InRelease Get:2 http://ports.ubuntu.com/ubuntu-ports noble-updates InRelease [126 kB] Get:3 http://ports.ubuntu.com/ubuntu-ports noble-backports InRelease [126 kB] Get:4 http://ports.ubuntu.com/ubuntu-ports noble-security InRelease [126 kB] ##### snipped ##### Reading package lists... Building dependency tree... Reading state information... 10 packages can be upgraded. Run 'apt list --upgradable' to see them.
- Install the Apache2 package and its dependencies.
$ sudo apt install --assume-yes apache2 WARNING: apt does not have a stable CLI interface. Use with caution in scripts. Reading package lists... Building dependency tree... Reading state information... apache2 is already the newest version (2.4.58-1ubuntu8.8). 0 upgraded, 0 newly installed, 0 to remove and 10 not upgraded.
- Confirm the apache2 service is running.
$ sudo systemctl status apache2 ● apache2.service - The Apache HTTP Server Loaded: loaded (/usr/lib/systemd/system/apache2.service; enabled; preset: enabled) Active: active (running) since Sat 2026-01-10 12:20:22 +08; 38min ago Docs: https://httpd.apache.org/docs/2.4/ Process: 10941 ExecStart=/usr/sbin/apachectl start (code=exited, status=0/SUCCESS) Main PID: 10944 (apache2) Tasks: 55 (limit: 4546) Memory: 28.9M (peak: 29.3M) CPU: 280ms CGroup: /system.slice/apache2.service ├─10944 /usr/sbin/apache2 -k start ├─10946 /usr/sbin/apache2 -k start └─10947 /usr/sbin/apache2 -k start ##### snipped #####Use journalctl -u apache2 and /var/log/apache2/error.log for recent startup errors.
- Enable the Apache2 service to start automatically on boot.
$ sudo systemctl enable apache2 Synchronizing state of apache2.service with SysV service script with /usr/lib/systemd/systemd-sysv-install. Executing: /usr/lib/systemd/systemd-sysv-install enable apache2
- Enable the rewrite module when URL rewriting is required.
$ sudo a2enmod rewrite Module rewrite already enabled
Common add-ons include headers, ssl, proxy, and http2.
- Verify that the rewrite module is loaded.
$ sudo apache2ctl -M | grep rewrite rewrite_module (shared)
- Display the default virtual host configuration to find DocumentRoot and logging directives.
$ sudo sed -n '1,120p' /etc/apache2/sites-available/000-default.conf <VirtualHost *:80> # The ServerName directive sets the request scheme, hostname and port that # the server uses to identify itself. This is used when creating # redirection URLs. In the context of virtual hosts, the ServerName # specifies what hostname must appear in the request's Host: header to # match this virtual host. For the default virtual host (this file) this # value is not decisive as it is used as a last resort host regardless. # However, you must set it for any further virtual host explicitly. #ServerName www.example.com ServerAdmin webmaster@localhost DocumentRoot /var/www/html # Available loglevels: trace8, ..., trace1, debug, info, notice, warn, # error, crit, alert, emerg. # It is also possible to configure the loglevel for particular # modules, e.g. #LogLevel info ssl:warn ErrorLog ${APACHE_LOG_DIR}/error.log CustomLog ${APACHE_LOG_DIR}/access.log combined # For most configuration files from conf-available/, which are # enabled or disabled at a global level, it is possible to # include a line for only one particular virtual host. For example the # following line enables the CGI configuration for this host only # after it has been globally disabled with "a2disconf". #Include conf-available/serve-cgi-bin.conf </VirtualHost> - Edit the default virtual host file to customize per-site directives.
$ sudo vi /etc/apache2/sites-available/000-default.conf
Incorrect syntax in /etc/apache2 can prevent apache2 from reloading and cause downtime.
- Modify the global Apache configuration when server-wide settings are needed.
$ sudo vi /etc/apache2/apache2.conf
- Test the configuration for errors before applying changes.
$ sudo apache2ctl configtest Syntax OK
Syntax OK indicates a valid configuration even when AH00558 is shown.
- Restart the Apache2 service to apply the changes.
$ sudo systemctl restart apache2
Use sudo systemctl reload apache2 for a graceful reload when a full restart is unnecessary.
- Allow incoming HTTP traffic through UFW when a firewall is enabled.
$ sudo ufw allow http Rules updated Rules updated (v6)
Debian commonly uses nftables/iptables instead of UFW.
- Allow incoming HTTPS traffic through UFW when a firewall is enabled.
$ sudo ufw allow https Rules updated Rules updated (v6)
- Verify the default site responds locally over HTTP.
$ curl -sI http://127.0.0.1/ HTTP/1.1 200 OK Date: Sat, 10 Jan 2026 04:59:21 GMT Server: Apache/2.4.58 (Ubuntu) Last-Modified: Sat, 10 Jan 2026 04:10:01 GMT ETag: "29af-64800d0d6e15b" Accept-Ranges: bytes Content-Length: 10671 Vary: Accept-Encoding Content-Type: text/html
Mohd Shakir Zakaria is a cloud architect with deep roots in software development and open-source advocacy. Certified in AWS, Red Hat, VMware, ITIL, and Linux, he specializes in designing and managing robust cloud and on-premises infrastructures.
