| 1 | <sect1 id="ch07-hosts">
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| 2 | <title>Creating the /etc/hosts file</title>
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| 3 | <?dbhtml filename="hosts.html" dir="chapter07"?>
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| 4 |
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| 5 | <para>If a network card is to be configured, you have to decide on the
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| 6 | IP-address, FQDN and possible aliases for use in the /etc/hosts file. An
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| 7 | example is:</para>
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| 8 |
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| 9 | <para><screen><my-IP> myhost.mydomain.org aliases</screen></para>
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| 10 |
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| 11 | <para>You should made sure that the IP-address is in the private network
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| 12 | IP-address range. Valid ranges are:</para>
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| 13 |
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| 14 | <para><screen> Class Networks
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| 15 | A 10.0.0.0
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| 16 | B 172.16.0.0 through 172.31.0.0
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| 17 | C 192.168.0.0 through 192.168.255.0</screen></para>
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| 18 |
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| 19 | <para>A valid IP address could be 192.168.1.1. A valid FQDN for this IP could
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| 20 | be www.linuxfromscratch.org</para>
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| 21 |
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| 22 | <para>If you aren't going to use a network card, you still need to
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| 23 | come up with a FQDN. This is necessary for programs like Sendmail to operate
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| 24 | correctly (in fact; Sendmail won't run when it can't determine the FQDN).</para>
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| 25 |
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| 26 | <para>If a network card is not going to be configured, a new file
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| 27 | <filename>/etc/hosts</filename> is created by running:</para>
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| 28 |
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| 29 | <para><screen><userinput>cat > /etc/hosts << "EOF"</userinput>
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| 30 | # Begin /etc/hosts (no network card version)
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| 31 |
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| 32 | 127.0.0.1 www.mydomain.com <value of HOSTNAME> localhost
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| 33 |
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| 34 | # End /etc/hosts (no network card version)
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| 35 | <userinput>EOF</userinput></screen></para>
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| 36 |
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| 37 | <para>If a network card is to be configured, a new file
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| 38 | <filename>/etc/hosts</filename> is created by running:</para>
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| 39 |
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| 40 | <para><screen><userinput>cat > /etc/hosts << "EOF"</userinput>
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| 41 | # Begin /etc/hosts (network card version)
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| 42 |
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| 43 | 127.0.0.1 localhost.localdomain localhost
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| 44 | 192.168.1.1 www.mydomain.org <value of HOSTNAME>
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| 45 |
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| 46 | # End /etc/hosts (network card version)
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| 47 | <userinput>EOF</userinput></screen></para>
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| 48 |
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| 49 | <para>Of course, the 192.168.1.1 and www.mydomain.org have to be changed
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| 50 | to your liking (or requirements if assigned an IP-address by a network/system
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| 51 | administrator and this machine is planned to be connected to that
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| 52 | network).</para>
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| 53 |
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| 54 | </sect1>
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| 55 |
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