[b08f409] | 1 | <sect1 id="ch09-hosts">
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| 2 | <title>Creating the /etc/hosts file</title>
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| 3 |
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| 4 | <para>
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[137bd50] | 5 | If a network card is to be configured, a user has to decide on the
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[b08f409] | 6 | IP-address, FQDN and possible aliases for use in the /etc/hosts file. An
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| 7 | example is:
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| 8 | </para>
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| 9 |
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| 10 | <blockquote><literallayout>
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| 11 |
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| 12 | <my-IP> myhost.mydomain.org aliases
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| 13 |
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| 14 | </literallayout></blockquote>
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| 15 |
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| 16 | <para>
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[137bd50] | 17 | It should made sure that the IP-address is in the private network
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| 18 | IP-address range. Valid ranges are:
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[b08f409] | 19 | </para>
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| 20 |
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| 21 | <blockquote><literallayout>
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| 22 |
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| 23 | Class Networks
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| 24 | A 10.0.0.0
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| 25 | B 172.16.0.0 through 172.31.0.0
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| 26 | C 192.168.0.0 through 192.168.255.0
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| 27 |
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| 28 | </literallayout></blockquote>
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| 29 |
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| 30 | <para>
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| 31 | A valid IP address could be 192.168.1.1. A valid FQDN for this IP could
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| 32 | be www.linuxfromscratch.org
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| 33 | </para>
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| 34 |
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| 35 | <para>
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[137bd50] | 36 | If a user is not going to use a network card, he still needs to come up with a
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[b08f409] | 37 | FQDN. This is necessary for programs like Sendmail to operate correctly (in
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| 38 | fact; Sendmail won't run when it can't determine the FQDN).
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| 39 | </para>
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| 40 |
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| 41 | <para>
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[137bd50] | 42 | If a network card is not going to be configured, a new file
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| 43 | <filename>/etc/hosts</filename> is created by running:
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[b08f409] | 44 | </para>
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| 45 |
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| 46 | <literallayout>
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| 47 |
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| 48 | <userinput>cat > /etc/hosts << "EOF"</userinput>
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| 49 | # Begin /etc/hosts (no network card version)
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| 50 |
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| 51 | 127.0.0.1 www.mydomain.com <value of HOSTNAME> localhost
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| 52 |
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| 53 | # End /etc/hosts (no network card version)
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| 54 | <userinput>EOF</userinput>
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| 55 |
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| 56 | </literallayout>
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| 57 |
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| 58 | <para>
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[137bd50] | 59 | If a network card is to be configured, a new file
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| 60 | <filename>/etc/hosts</filename> is created containing:
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[b08f409] | 61 | </para>
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| 62 |
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| 63 | <literallayout>
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| 64 |
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| 65 | <userinput>cat > /etc/hosts << "EOF"</userinput>
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| 66 | # Begin /etc/hosts (network card version)
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| 67 |
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| 68 | 127.0.0.1 localhost.localdomain localhost
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| 69 | 192.168.1.1 www.mydomain.org <value of HOSTNAME>
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| 70 |
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| 71 | # End /etc/hosts (network card version)
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| 72 | <userinput>EOF</userinput>
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| 73 |
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| 74 | </literallayout>
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| 75 |
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| 76 | <para>
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[137bd50] | 77 | Of course, the 192.168.1.1 and www.mydomain.org have to be changed to the
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| 78 | users
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| 79 | liking (or requirements if assigned an IP-address by a network/system
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| 80 | administrator and this machine is planned to be connected to that network).
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[b08f409] | 81 | </para>
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| 82 |
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| 83 | </sect1>
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| 84 |
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