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I have a Xen-based Centos 5.5 virtual machine running as a server - Apache, OpenSSH, MySQL, Tomcat, Nagios and ISC Bind. It is currently running both d-bus and hal-daemon. Are these needed or can I safely turn them off?

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Well... you can turn them off if nothing needs them. Kill D-Bus, and if nothing rolls over or complains then you can kill hal as well. "And the like" isn't specific enough to give any sort of an answer.

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Thanks for the answer. I've updated the list of main apps which are running on the machine. I stopped them, and nothing seems to complain in /var/log/messages or other locations. Is there anything specific I should be looking for? –  Robert Munteanu Oct 7 '10 at 7:03
    
Not really. Just... stuff not working as usual. The apps you list don't normally use either, so you're probably fine. –  Ignacio Vazquez-Abrams Oct 7 '10 at 7:21
    
Right, thanks . –  Robert Munteanu Oct 7 '10 at 7:30
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