How to enable and disable PHP curl module with Apache on Ubuntu Linux and Debian/Ubuntu Linux Specific Commands to Start/Stop/Restart Apache

 

Instructions

Installation of Curl module

Let's install Apache curl module along with Apache 2 webserver and PHP.

# apt install libapache2-mod-php php-curl

Restart the Apache webserver:

# service apache2 restart

Check for curl module state

Insert the following lines into a new PHP script eg. curl-check.php within /var/www/html/ directory:
<?php
echo 'Curl: ', function_exists('curl_version') ? 'Enabled' . "\xA" : 'Disabled' . "\xA";
?>
Make the script executable and use curl command to render the output of curl-check.php php code:
# chmod +x /var/www/html/curl-check.php
# curl localhost/curl-check.php
Curl: Enabled

Disable PHP curl module

To disable curl php module execute:
# phpdismod curl
# service apache2 restart
# curl localhost/curl-check.php
Curl: Disabled

Enable PHP curl module

To enable curl php module execute:
# phpenmod curl
# service apache2 restart
# curl localhost/curl-check.php
Curl: Enabled
source

You can either use service or /etc/init.d/ command as follows on Debian Linux version 7.x or Ubuntu Linux version Ubuntu 14.10 or older:

Restart Apache 2 web server, enter:

# /etc/init.d/apache2 restart
OR
$ sudo /etc/init.d/apache2 restart
OR
$ sudo service apache2 restart

To stop Apache 2 web server, enter:

# /etc/init.d/apache2 stop
OR
$ sudo /etc/init.d/apache2 stop
OR
$ sudo service apache2 stop

To start Apache 2 web server, enter:

# /etc/init.d/apache2 start
OR
$ sudo /etc/init.d/apache2 start
OR
$ sudo service apache2 start

A note about Debian/Ubuntu Linux systemd users

Use the following systemctl command on Debian Linux version 8.x+ or Ubuntu Linux version Ubuntu 15.04+ or above:
## Start command ##
systemctl start apache2.service
## Stop command ##
systemctl stop apache2.service
## Restart command ##
systemctl restart apache2.service
We can view status using the following command:
$ sudo systemctl status apache2.service

● apache2.service - The Apache HTTP Server
     Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2021-02-24 20:39:39 UTC; 5 days ago
       Docs: https://httpd.apache.org/docs/2.4/
    Process: 115 ExecStart=/usr/sbin/apachectl start (code=exited, status=0/SUCCESS)
    Process: 15247 ExecReload=/usr/sbin/apachectl graceful (code=exited, status=0/SUCCESS)
   Main PID: 128 (apache2)
      Tasks: 6 (limit: 4672)
     Memory: 16.4M
     CGroup: /system.slice/apache2.service
             ├─  128 /usr/sbin/apache2 -k start
             ├─15254 /usr/sbin/apache2 -k start
             ├─15255 /usr/sbin/apache2 -k start
             ├─15256 /usr/sbin/apache2 -k start
             ├─15257 /usr/sbin/apache2 -k start
             └─15258 /usr/sbin/apache2 -k start

Feb 27 00:00:23 ubuntu-db-mgmnt systemd[1]: Reloaded The Apache HTTP Server.
Feb 28 00:00:23 ubuntu-db-mgmnt systemd[1]: Reloading The Apache HTTP Server.