Services & Processes for Linux

Certinator

Does anyone know where I can find what services and processes DNS and NTP uses

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Pseudonym

I'd answer this, but it's a really lazy question.

yoba222

I'll help with the second one:

$ man ntpd

shochan

Pseudo! LOL

Image: https://us.v-cdn.net/6030959/uploads/editor/pc/qtgzdoaw3786.png

paul78

Certinator said:

Does anyone know where I can find what services and processes DNS and NTP uses

Alrighty - all kidding aside. Can you provide a bit more context? Like clarifying what and why of your question?

How much Linux experience do you actually have? I can appreciate that sometimes it get be confusing when you are starting out just to figure out which terms to google.

In Linux - you can discover processes using the "ps" command if that's what you are asking. As @yoba222 mentioned - the "man" command can be very helpful in learning how to use the commands. You should also learn to use "grep" and understand how pipes work if you don't already know.

Certinator

Thanks @yoba222 and @paul78. I recently took the CASP exam and recall having a sim where I had to harden a Red Hat server that was being used as a DNS and Time server. It asked me to disable all other unecessary processes (wireless, bluetooth, etc.) I used ps - A and retrieved a list of currently running services (roughly 25 services). I pretty much disabled everything except network, named, ntpd, and sshd. I'm wondering if I disabled more services than I was suppose to.

paul78

Certinator said:

..... I'm wondering if I disabled more services than I was suppose to.

If the server is still working and it's still responding to DNS and NTP requests, it should be fine. Is there a problem with what the server is suppose to do?

Certinator

On the sim there was no way to tell if it was responding to DNS and NTP requests. They only offer like 5 available commands to use and those were only for listing/stopping services and killing processes (ps -A, chkconfig, service, kill -9).

Sylabicuma

I found a really good site for this:

http://lmgtfy.com/?q=what+processes+and+services+does+dns+use+linux

paul78

Certinator said:

On the sim there was no way to tell if it was responding to DNS and NTP requests. They only offer like 5 available commands to use and those were only for listing/stopping services and killing processes (ps -A, chkconfig, service, kill -9).

So how would you know it's a problem? I'm not really sure what problem you are trying to solve. Is netstat a command you have access to? You can also use that to figure out what processes are also listening.

Just my two cents, if you are trying to learn how to do this - you may not want to use a simulator. It's a poor substitute for real-world experience. You may just want to install a hypervisor (like VMware player) and a Linux distro like Centos (which is similar to Redhat) or Ubuntu (which is used by many tech companies) and try it out. You can do all this without spending any money for access to a simulator or training course.