The Perfect Server - CentOS 5.5 x86_64 [ISPConfig 2] - Page 3

4 Adjust /etc/hosts

Next we edit /etc/hosts. Make it look like this:

vi /etc/hosts

# Do not remove the following line, or various programs
# that require network functionality will fail.               localhost.localdomain localhost  server1
::1             localhost6.localdomain6 localhost6


5 Configure Additional IP Addresses

(This section is totally optional. It just shows how to add additional IP addresses to your network interface eth0 if you need more than one IP address. If you're fine with one IP address, you can skip this section.)

Let's assume our network interface is eth0. Then there is a file /etc/sysconfig/network-scripts/ifcfg-eth0 which contains the settings for eth0. We can use this as a sample for our new virtual network interface eth0:0:

cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:0

Now we want to use the IP address on the virtual interface eth0:0. Therefore we open the file /etc/sysconfig/network-scripts/ifcfg-eth0:0 and modify it as follows (we can leave out the HWADDR line as it is the same physical network card):

vi /etc/sysconfig/network-scripts/ifcfg-eth0:0

# Intel Corporation 82545EM Gigabit Ethernet Controller (Copper)

Afterwards we have to restart the network:

/etc/init.d/network restart

You might also want to adjust /etc/hosts after you have added new IP addresses, although this is not necessary.

Now run


You should now see your new IP address in the output:

[root@server1 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:FD:78:BE
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::20c:29ff:fefd:78be/64 Scope:Link
          RX packets:469 errors:0 dropped:0 overruns:0 frame:0
          TX packets:534 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:43223 (42.2 KiB)  TX bytes:100665 (98.3 KiB)
          Base address:0x1070 Memory:e8820000-e8840000

eth0:0    Link encap:Ethernet  HWaddr 00:0C:29:FD:78:BE
          inet addr:  Bcast:  Mask:
          Base address:0x1070 Memory:e8820000-e8840000

lo        Link encap:Local Loopback
          inet addr:  Mask:
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 b)  TX bytes:560 (560.0 b)

[root@server1 ~]#


6 Disable The Firewall And SELinux

(You can skip this chapter if you have already disabled the firewall and SELinux at the end of the basic system installation (in the Setup Agent).)

I want to install ISPConfig at the end of this tutorial which comes with its own firewall. That's why I disable the default CentOS firewall now. Of course, you are free to leave it on and configure it to your needs (but then you shouldn't use any other firewall later on as it will most probably interfere with the CentOS firewall).

SELinux is a security extension of CentOS that should provide extended security. In my opinion you don't need it to configure a secure system, and it usually causes more problems than advantages (think of it after you have done a week of trouble-shooting because some service wasn't working as expected, and then you find out that everything was ok, only SELinux was causing the problem). Therefore I disable it, too (this is a must if you want to install ISPConfig later on).



Set both Security Level and SELinux to Disabled and hit OK:

Afterwards we must reboot the system:



7 Install Some Software

First we import the GPG keys for software packages:

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY*

Then we update our existing packages on the system:

yum update

Now we install some software packages that are needed later on:

yum install fetchmail wget bzip2 unzip zip nmap openssl lynx fileutils ncftp gcc gcc-c++

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9 Comment(s)

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From: Dave at: 2010-11-05 10:10:28

Hi Falco,

I'm trying this out for the first time so I'm not sure of a lot of things and the first pit-fall I have found is the DNS stuff. I just don't understand if its for the box, the LAN or WAN so I used the Google public dns, used my router IP and for the box.

I've been setting up windows networks, building windows PC's and developing websites on Linux for over 15 years. I have a degree in computing from a top uni and I still don't get how this all works!

If you can add a link for setting up DNS settings and/or edit to say what the defaults should be for a novice I think that would be a huge help at this stage.

Thanks for all the help with this.


From: Steveorevo at: 2010-07-22 23:23:15

You can get ncftp from the "Extras Testing" by running

rpm -i


From: Anonymous at: 2010-09-29 09:55:55

how about for 32 bit?

From: Anonymous at: 2011-03-30 20:21:49

ncftp is not on this server any more!

From: Steveorevo at: 2010-07-22 04:39:41

Note: there is no ncftp package for CentOS and the instructions here will result in "No package ncftp available." Unless otherwise noted, this can be safely ignored.

From: Anonymous at: 2011-06-22 02:53:48

last command was

mysqladmin -h <hostname> -u root ....

 It should have been

mysql -h <hostname> -u root -p (then hit return, then enter your password)

From: Doug Lucy at: 2010-06-13 21:51:27

For 32-bit installs, the correct line for the second part of step 16 is:

rpm -ivh

From: at: 2010-07-31 01:29:25

There is a bug in Perl's Tar module for 5.8.8, you should check that Spamassassin is able to update correctly by running: /home/admispconfig/ispconfig/tools/spamassassin/usr/bin/sa-update If you receive the dreaded " Argument "1.39_01" isn't numeric" then be sure to edit /usr/lib/perl5/vendor_perl/5.8.8/Archive/ to read: $VERSION                = "1.39_01"; $VERSION                = eval $VERSION; Add line "$VERSION                = eval $VERSION;" as shown above to resolve problem.

From: Jazzzz at: 2010-11-22 16:00:59

If not install flex the ISPConfig's installation fail.

Type yum install flex befor setup ISPConfig

yum intall flex