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Install

sudo apt update && sudo apt upgrade
sudo apt install apache2
sudo ufw allow 'Apache Full'
sudo ufw allow 'OpenSSH'
sudo ufw enable

sudo nano /etc/php/7.4/apache2/php.ini
sudo nano /etc/php/7.2/apache2/php.ini

Status apache2

httpd -v
sudo systemctl status apache2
sudo systemctl is-enabled apache2
sudo systemctl restart apache2

## Chk permission user/group 

ps aux | egrep '(apache|httpd)'


##CentOS7
sudo apachectl configtest
#Syntax OK
sudo systemctl restart httpd.service
#OR
sudo systemctl restart httpd

Configuring Apache

Open Apache ports.conf file using the below command;

sudo nano /etc/apache2/ports.conf
##Look for the following line;

Listen 127.0.0.1:80

##Moreover, change it to;

Listen 127.0.01:8080

##Save and Exit.

# edit the default virtual host file in Apache. The <VirtualHost> in this file is set to serve sites only on port 80

sudo nano /etc/apache2/sites-available/000-default.conf
##Look for the following line;

<VirtualHost 127.0.0.1:80>
##Moreover, change it to;

<VirtualHost 127.0.0.1:8080>
##Save the file and reload Apache.

sudo service apache2 reload
##Verify that Apache is now listening on 8080.

sudo netstat -tlpn
##The output is shown below, with apache2 listening on :::8080.

## Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address     Foreign Address      State    PID/Program name
tcp        0      0 0.0.0.0:22        0.0.0.0:*            LISTEN   1086/sshd
tcp6       0      0 :::8080           :::*                 LISTEN   4678/apache2

### CentOS7
/etc/apache2/httpd.conf
/etc/apache2/apache2.conf
/etc/httpd/httpd.conf
/etc/httpd/conf/httpd.conf

#access server via cli can confirm exact location that Apache loading its configuration file from by running cli
apachectl -V
#or
httpd -V

User & Web user

sudo chown -R apache:apache /var/www/public_html/
sudo chmod -R 775 /var/www/public_html/

sudo usermod -a -G www-data $USER
sudo chown -R $USER:www-data /var/www/

Permission

sudo mkdir /var/www/public_html/mysite
sudo chown $USER:www-data /var/www/public_html/mysite
sudo chmod g+s /var/www/public_html/mysite
sudo chmod o-rwx /var/www/public_html/mysite

Chk issue log

apachectl -S
# Main ErrorLog: "/etc/apache2/logs/error_log"
cat /etc/apache2/logs/error_log

truncate -s 0 /etc/apache2/logs/error_log

Remove apache2

sudo service apache2 stop
sudo systemctl disable --now apache2
sudo apt-get purge apache2 apache2-utils apache2.2-bin apache2-common
sudo apt-get autoremove 
whereis apache2
  
sudo rm -rf /etc/apache2

Restart

sudo systemctl restart httpd.service
sudo apachectl –k restart
apachectl –k stop
apachectl –k graceful
apachectl –k restart
apachectl –k graceful–stop
sudo systemctl start httpd.service
sudo systemctl stop httpd.service
sudo systemctl reload httpd.service

LAMP (Linux, Apache, MySQL, PHP)

Step 1 — Installing Apache and Updating the Firewall The Apache web server is among the most popular web servers in the world. It’s well documented, has an active community of users, and has been in wide use for much of the history of the web, which makes it a great default choice for hosting a website.Install Apache using Ubuntu’s package manager, apt:

sudo apt update
sudo apt install apache2

If this is the first time you’re using sudo within this session, you’ll be prompted to provide your user’s password to confirm you have the right privileges to manage system packages with apt. You’ll also be prompted to confirm Apache’s installation by pressing Y, then ENTER.Once the installation is finished, you’ll need to adjust your firewall settings to allow HTTP traffic. UFW has different application profiles that you can leverage for accomplishing that. To list all currently available UFW application profiles, you can run:

sudo ufw app list 

Output
Available applications:
  Apache
  Apache Full
  Apache Secure
  
  OpenSSH

Here’s what each of these profiles mean: Apache: This profile opens only port 80 (normal, unencrypted web traffic). Apache Full: This profile opens both port 80 (normal, unencrypted web traffic) and port 443 (TLS/SSL encrypted traffic). Apache Secure: This profile opens only port 443 (TLS/SSL encrypted traffic).For now, it’s best to allow only connections on port 80, since this is a fresh Apache installation and you still don’t have a TLS/SSL certificate configured to allow for HTTPS traffic on your server. To only allow traffic on port 80, use the Apache profile:

sudo ufw allow in "Apache" 
sudo ufw status

Output Status: active

To                         Action      From
--                         ------      ----
OpenSSH                    ALLOW       Anywhere                                
Apache                     ALLOW       Anywhere                  
OpenSSH (v6)               ALLOW       Anywhere (v6)                    
Apache (v6)                ALLOW       Anywhere (v6)     

#if inactive 

sudo ufw enable

http://your_server_ip

Troubleshot /Apache Log Files

sudo tail -n 10 /var/log/apache2/error.log

# on CentOS/RHEL-based distributions:     
sudo tail -n 10 /var/log/httpd/error_log

# on Debian/Ubuntu-based distributions: 
sudo tail -n 10 /var/log/apache2/error.log