Remove unwanted services in centos 7

Used Zammad version: Latest build
Operating system: CentOS 7 minimal

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I need to freeup some CPU/RAM usage and thinking to stop some unnecessary services if not effect on zammad functionality. Need to know do you confirm this services
I would be appriciate for any other advise.

Well with Java you have one of the hungriest proccesses on a Zammad instance.
However, I’m afraid it’s required for elasticsearch to be running. (Java is a elasticsearch dependency).

Nobody can answer this question in terms of your instance setup.
If you send mails via sendmail on that host, you shouldn’t remove postfix. Postfix is a mail server / mta that can send mails for you. Again, that’s something probably only you can tell.

As for cronyd this should have the smallest footprint on your host and in my opinion is rather usefull:

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