Solution to Ubuntu PHP service failing to start normally

Title: Methods to solve the problem of PHP service failing to start normally under Ubuntu and specific code examples

When using Ubuntu to build websites or applications, you often encounter PHP services Problems that cannot be started properly, which may cause the website to be inaccessible or the application to not function properly. This article will introduce how to solve the problem that the PHP service cannot start normally under Ubuntu, and provide specific code examples to help readers quickly solve such failures.

1. Check the PHP configuration file

First, we need to check whether the PHP configuration file is configured correctly. In the Ubuntu system, the PHP configuration file is usually located in /etc/php/7.x/apache2/php.ini (7.x is the version number of PHP). We can use vim or other editors to open this file and check to ensure that the configuration items are set correctly.

sudo vim /etc/php/7.x/apache2/php.ini

In the opened configuration file, we need to pay attention to the following important configuration items:

1. Check whether the path of the php error log is correctly configured, for example: error_log=/var/ log/php_errors.log
2. Make sure the extension_dir configuration in php.ini correctly points to the installation path of the PHP extension, for example: extension_dir="/usr/lib/php/20170718"
3. Check PHP Whether the memory limit setting meets the requirements can be adjusted appropriately according to the actual situation, for example: memory_limit = 128M

2. Check the Apache configuration file

PHP services are usually parsed and executed through the Apache server , so you also need to check whether the Apache configuration file is set correctly. Apache's configuration file is usually located in /etc/apache2/apache2.conf or /etc/apache2/sites-available/000-default.conf. We can use a similar method to open the Apache configuration file for inspection.

sudo vim /etc/apache2/apache2.conf

In the Apache configuration file, we need to pay attention to the following important configuration items:

1. Ensure that the LoadModule php7_module configuration correctly points to the path of the PHP module, for example: LoadModule php7_module /usr /lib/apache2/modules/libphp7.so
2. Check whether AddType is configured correctly application/x-httpd-php .php is used to specify the parsing method of PHP files
3. Check whether it is in Apache Instructions such as DocumentRoot and Directory are correctly set in the virtual host configuration to ensure that PHP can parse and execute normally

3. Restart Apache and check the log

After completing the above configuration check, we need Restart the Apache server for the configuration to take effect. We can restart Apache using the following command:

sudo systemctl restart apache2

Next, we can check the Apache error log to get more details about the PHP service failing to start normally:

sudo tail -f /var/log/apache2/error.log

Look for the error in the log and Error information related to PHP service startup, and perform corresponding debugging and repair based on the error information.

4. Reinstall PHP and related extensions

If the above method still cannot solve the problem, we can try to reinstall PHP and related extensions to ensure that there are no damaged files or components in the system. We can use the following command to reinstall PHP and related extensions:

sudo apt-get purge php*
sudo apt-get install php

5. Test PHP service

Finally, we can create a simple PHP test file (such as info.php) to test PHP Whether the service is working properly. We can create this test file in the DocumentRoot directory of Apache with the following content:

<?php
phpinfo();
?>

Save and access the file. If the browser can correctly display the PHP information page, it means that the PHP service has started normally.

Summary:

Through the above steps, we can quickly solve the problem that the PHP service cannot start normally under Ubuntu. When troubleshooting, carefully check the configuration files of PHP and Apache, restart Apache and check the error log, reinstall PHP and related extensions, etc., to find the root cause of the problem and fix it. I hope the above content is helpful to readers, and have fun building PHP applications!

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