Why do I get permission errors related to SSLMutex when I start Apache?
Errors such as “mod_ssl: Child could not open SSLMutex lockfile /opt/apache/logs/ssl_mutex.18332 (System error follows) […] System: Permission denied (errno: 13)” are usually caused by overly restrictive permissions on the parent directories. Make sure that all parent directories (here /opt, /opt/apache and /opt/apache/logs) have the x-bit set for, at minimum, the UID under which Apache’s children are running (see the User directive).