It is useful to have a monitoring script, which checks apache responsiveness every minute and restarts it if there is any problem with it. Also, sometimes apache needs to be stopped several times before it can start correctly.
[Tue Aug 3 12:02:42 2004] [notice] caught SIGTERM, shutting down
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.45:80 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.45:443 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.46:80 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.46:443 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.41:80 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.41:443 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.61:80 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.61:443 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.60:80 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.60:443 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.57:80 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.57:443 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.59:80 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.59:443 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.58:80 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [warn] NameVirtualHost 212.179.2.58:443 has no VirtualHosts
[Tue Aug 3 12:02:43 2004] [notice] Apache/1.3.31 (Unix) mod_ssl/2.8.19 OpenSSL/0.9.7a PHP/4.3.8 mod_perl/1.27 FrontPage/5.0.2.2510
configured -- resuming normal operations
[Tue Aug 3 12:02:43 2004] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Tue Aug 3 12:02:43 2004] [notice] Accept mutex: sysvsem (Default: sysvsem)
[Tue Aug 3 12:09:33 2004] [notice] caught SIGTERM, shutting down
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.45:80 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.45:443 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.46:80 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.46:443 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.41:80 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.41:443 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.61:80 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.61:443 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.60:80 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.60:443 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.57:80 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.57:443 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.59:80 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.59:443 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.58:80 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [warn] NameVirtualHost 212.179.2.58:443 has no VirtualHosts
[Tue Aug 3 12:09:34 2004] [notice] Apache/1.3.31 (Unix) mod_ssl/2.8.19 OpenSSL/0.9.7a PHP/4.3.8 mod_perl/1.27 FrontPage/5.0.2.2510
configured -- resuming normal operations
[Tue Aug 3 12:09:34 2004] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Tue Aug 3 12:09:34 2004] [notice] Accept mutex: sysvsem (Default: sysvsem)