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Summary of A Linux Systemunix Services

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System services would be the services that the server will run, and become used. They are why is your server a web server essentially, and just what brings you customers. Whether your clients be having to pay users (for example within an ISP), or they be donation users (users that provide little if any money towards your server), they’re still important. Those are the reason that you would like a web server, so you should consider them. Linux offers *MANY* services, here are the more prevalent services:

* Covering Services (The Secure Covering (SSH), Telnet, Remote Covering, etc)

* Mail Services (POP3, SMTP)

* Web Services (Website Hosting)

* DNS Services (Website Name Services)

* FTP Services

* Talk Services (via Spoken, enables users logged directly into talk to one another)

* Kerberos Services (secure authentication techniques)

Linux offers a number of other services, that will be described at length later. The majority of the services lie within the /etc/init.d directory, that is really some launch scripts, but because most services are began at boot, therefore the /etc/init.d directory will be a good starting point searching for services installed…..you may also try tel netting to known service ports, that are listed the following:

Telnet: 23

SMTP: 25

HTTP: 80

DNS: 53

SSH: 22

Talk: 517

Kerberos: 750

FTP: 21

If you’re running the service, you’re going to get a note that appears like:

/home/ares> telnet localhost.localdomain 22

Trying 192.122.209.42…

Linked to localhost.localdomain.

Escape character is ‘^]’.

SSH-1.5-1.2.20

Then you’re running the service that’s reported. Also, you are able to download the portscanner nmap from from insecure.org. It will come in Revoltions per minute formats, in addition to .tar and .tgz formats. Once installed, you are able to invoke it using the following syntax:

nmap localhost.localdomain

Nmap will output all of the open ports in your server. This is great for checking other servers in your network, to determine what services they’re running. If you notice something, for example Sendmail (SMTP service) running, and you do not need it, I suggest removing it, via commenting the lines in /etc/init.d/sendmail, or just by issuing the next command:

/etc/init.d/sendmail stop

Then united nations-setting it up, using the package manager for the distribution (i.e. revoltions per minute for Red Hat Linux). For example, to united nations-use a revoltions per minute package, make use of the following command:

revoltions per minute -e packagename

To determine a summary of all revoltions per minute packages, make use of the following command:

revoltions per minute -qa more

This can send the output up to the more command, once we have covered earlier. If your package provides you with an addiction error, you will have to united nations-install the dependency first, or else you may pressure the united nations-install using the -f option (*NOT* suggested). You should use the deselect enter in Debian Linux to get rid of the undesirable package, simply type:

deselect

To create the deselect menu up. This really is more user-friendly compared to revoltions per minute utility, if you want interfaces that’s. Now, we’ll proceed to specific services, the very first out there may be the apache server.

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