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| <h3 class="section">28.2 The NSS Configuration File</h3> |
| |
| <p><a name="index-g_t_0040file_007b_002fetc_002fnsswitch_002econf_007d-3273"></a><a name="index-g_t_0040file_007bnsswitch_002econf_007d-3274"></a>Somehow the NSS code must be told about the wishes of the user. For |
| this reason there is the file <samp><span class="file">/etc/nsswitch.conf</span></samp>. For each |
| database this file contain a specification how the lookup process should |
| work. The file could look like this: |
| |
| <pre class="example"> # /etc/nsswitch.conf |
| # |
| # Name Service Switch configuration file. |
| # |
| |
| passwd: db files nis |
| shadow: files |
| group: db files nis |
| |
| hosts: files nisplus nis dns |
| networks: nisplus [NOTFOUND=return] files |
| |
| ethers: nisplus [NOTFOUND=return] db files |
| protocols: nisplus [NOTFOUND=return] db files |
| rpc: nisplus [NOTFOUND=return] db files |
| services: nisplus [NOTFOUND=return] db files |
| </pre> |
| <p>The first column is the database as you can guess from the table above. |
| The rest of the line specifies how the lookup process works. Please |
| note that you specify the way it works for each database individually. |
| This cannot be done with the old way of a monolithic implementation. |
| |
| <p>The configuration specification for each database can contain two |
| different items: |
| |
| <ul> |
| <li>the service specification like <code>files</code>, <code>db</code>, or <code>nis</code>. |
| <li>the reaction on lookup result like <code>[NOTFOUND=return]</code>. |
| </ul> |
| |
| <ul class="menu"> |
| <li><a accesskey="1" href="Services-in-the-NSS-configuration.html#Services-in-the-NSS-configuration">Services in the NSS configuration</a>: Service names in the NSS configuration. |
| <li><a accesskey="2" href="Actions-in-the-NSS-configuration.html#Actions-in-the-NSS-configuration">Actions in the NSS configuration</a>: React appropriately to the lookup result. |
| <li><a accesskey="3" href="Notes-on-NSS-Configuration-File.html#Notes-on-NSS-Configuration-File">Notes on NSS Configuration File</a>: Things to take care about while |
| configuring NSS. |
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