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