Logs (hosting)
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An overview of the most important logs on webservers, especially our WooCommerce sites.
PHP
The PHP error log seems the most important log. It actually includes important stuff that I would have expected to be included in MySQL logs.
Usual locations:
/var/log/php_error.log(h2, nltmp)/var/log/php/error.log(h1).
MySQL
Quite important. Usual location:
/var/log/mysql
Due to security settings on files & folders, it's a bit more complicated to read. E.g.:
sudo ls -alFh /var/log/mysqlsudo tail /var/log/mysql/error.log -n 100
Apache
I don't use Apache logs so much for troubleshooting websites. I do use them for estimating traffic, like traffic from bots.
Usual logs:
/var/log/apache2/access.log/var/log/apache2/error.log.
I really like this real-time view of the Apache log:
sudo tail -f /var/log/apache2/access.log