mod_rewriteis a powerful module that Apache can utilize. It is a way of rewriting URLs, modifying the request that Apache recieves. This could be a moved document, or enforcing SSL (rewriting the URL from http to https).
Rsyslog (aka syslog) can pull in logs from journald, via the socket (using imuxsock module) or a specific module that taps in to a socket that is journald runs (imjournal) with very little config. imjournal specialises in logging that is structured (e.g. logs that follow json structure) and then filtering or querying logs. As a result, imjournal is more expensive. These modules are already loaded by default inrsyslog.conf file and do not need adding in any other configuration files.
SELinux contexts follow the SELinux user:role:type:level syntax.
ACLs are a method for defining access to files and directories on a system. These can be set at the user level, group level, or via the effective rights mask.
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