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Old 09-05-2009, 08:00 AM   #1
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Registered: Sep 2009
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Installation of Linux

Dear Forum,

I am a SAP Basis / ORACLE professional. 13 years ago I started with Digital Unix, then, 2 years later, went on to HP-UX. Another 2 years later I had to continue with Windows NT and did this till now. The consequences are desastrous. I forgot nearly all of my Unix knowhow. For this reason I have to ask questions that may seem stupid to you. I really should like to ask your pardon for this.

Currently I try to leave Windows completely and to turn to Linux (CentOS). When installing you are asked which ports to leave open and I decided for HTTP and FTP. Most probably this was a bad mistake. Two weeks later my notebook has become that slow that I suppose that there is something on it which must not be there. Consequently I'll uninstall Linux and install it from new, this time without any port being left open. Of course I have to make downloads from internet such as flash player.

Is it right to leave all ports closed ? And when uninstalling do I have to format the volume where Linux was installed before ? What do I have to do in general to hinder malware, viruses and similar things to come onto my notebook ?

Are there members living in Germany ?

Thank you for you help in advance.

Kind regards
Old 09-05-2009, 08:09 AM   #2
Registered: Sep 2009
Distribution: fedora 11
Posts: 318

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There's no problem with closing all the ports unless you need them. But why do you want to keep all ports closed? It will make a lot problems while networking.

Yes, if you're installing on the same volume, you should format(or replace) the volume.

Malware and viruses, they're not a problem as like windows, but ofcourse there are a very few. Keep your firewall active and if you want there are Antiviruses for linux. Most of them are console based(no gui). Clam AV is a good one

Last edited by j_jerry; 09-05-2009 at 08:10 AM.
Old 09-05-2009, 08:24 AM   #3
Registered: Jan 2005
Location: Midwest USA, Central Illinois
Distribution: SlackwareŽ
Posts: 12,768
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Welcome to LQ!

I'm a old UNIX guy myself. I've been using GNU/Linux since it's inception. I haven't had a UNIX licensed machine in years. I retired from the LAB back in 96 so I couldn't continue license costs. I continued with GNU/Linux an never turned back. I still use UNIX but only when clients or someone else guests me. Sure I could have continued with an account at the University but really didn't need the hassle to keep the account active. Plus some of my use is commercial thus violating license agreements with academia.

As for the security of your install look at chkroot. You won't have the problem of M$ on a GNU/Linux install. But you should make sure to have a good firewall and possibly a means to check for rootkits. 'Tripwire' is another means of protection.

You should minimize the services available on your machine. Just disable the services that you know that will not be used.

You can get a lot of reference online so here are a few links to aid you;

Linux Documentation Project
Rute Tutorial & Exposition
Linux Command Guide
Linux Newbie Admin Guide
Getting Started with Linux

These links and others can be found at 'Slackware-Links' . More than just SlackwareŽ links!
Old 09-05-2009, 11:15 AM   #4
Registered: Nov 2007
Location: Kentucky
Distribution: Slackware13.1
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A good many of us don't close any ports and a lot that run the out of the box distro's probably don't know what ports are open or closed.
All I do for security is get behind a router, be careful of what I install, don't go where I shouldn't and use Guarddog as a firewall even though I'm behind a router and run rkhunter on occasion.
Old 09-06-2009, 09:09 PM   #5
LQ Guru
Registered: Aug 2004
Location: Sydney
Distribution: Centos 6.9, Centos 7.3
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Closing all the inbound ports during install (which is what Centos is asking) is a good idea.
Its just asking if you want to run an externally visible webserver, ftp server & ssh iirc.
If you later want to run eg a webserver that will be visible externally, you can always turn it on.
The install won't close outbound (& rtn) ports, so you can still surf, download etc, etc.
BTW, you can use this manual for Centos (even though its marked RedHat)


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