修改配置文件.md

# 修改配置文件<a name="ZH-CN_TOPIC_0182317330"></a>

DNF 的主要配置文件是 /etc/dnf/dnf.conf，该文件中“main”部分保存着 DNF 的全局设置；用户可以在该文件中通过添加一个或者多个“repository”部分的方式来设置需要安装的软件源位置。

另外，在/etc/yum.repos.d 目录中保存着一个或多个repo 源相关文件，它们定义了不同的“repository”。

软件源的配置一般有两种方式，一种是直接配置  /etc/dnf/dnf.conf 文件，另外一种是在 /etc/yum.repos.d 目录下增加 .repo 文件。

## 修改main部分<a name="zh-cn_topic_0151921080_se5de3a22d49e406facb880f28d61d2b4"></a>

/etc/dnf/dnf.conf 文件包含的“main”部分，配置文件示例如下：

```
[main]
gpgcheck=0
installonly_limit=3
clean_requirements_on_remove=True
best=True
```

常用选项说明：

**表 1**  main参数说明

<a name="zh-cn_topic_0151921080_t2716a40f69b24a989ec3c0b6f278cb5d"></a>
<table><thead align="left"><tr id="zh-cn_topic_0151921080_re437b39f0a1647ff864353c080184c45"><th class="cellrowborder" valign="top" width="31.580000000000002%" id="mcps1.2.3.1.1"><p id="zh-cn_topic_0151921080_a228122f6ac30401d8237a59bf9535ad1"><a name="zh-cn_topic_0151921080_a228122f6ac30401d8237a59bf9535ad1"></a><a name="zh-cn_topic_0151921080_a228122f6ac30401d8237a59bf9535ad1"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="68.42%" id="mcps1.2.3.1.2"><p id="zh-cn_topic_0151921080_ae291ac87cc3c4ce1bd23cfbd2f989d09"><a name="zh-cn_topic_0151921080_ae291ac87cc3c4ce1bd23cfbd2f989d09"></a><a name="zh-cn_topic_0151921080_ae291ac87cc3c4ce1bd23cfbd2f989d09"></a>说明</p>
</th>
</tr>
</thead>
<tbody><tr id="zh-cn_topic_0151921080_raeb774ff205e457e818067d51a26a39a"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_aca09cf10eb084bee89cf1f5fe5f35fac"><a name="zh-cn_topic_0151921080_aca09cf10eb084bee89cf1f5fe5f35fac"></a><a name="zh-cn_topic_0151921080_aca09cf10eb084bee89cf1f5fe5f35fac"></a>cachedir</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_a2151a724f4ff4a468f77b15eaec8ed3a"><a name="zh-cn_topic_0151921080_a2151a724f4ff4a468f77b15eaec8ed3a"></a><a name="zh-cn_topic_0151921080_a2151a724f4ff4a468f77b15eaec8ed3a"></a>缓存目录，该目录用于存储RPM包和数据库文件。</p>
</td>
</tr>
<tr id="zh-cn_topic_0151921080_r22f24b5ffe0e4bc3be64ef01afc49c6c"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_a33e3b7427b024df7922a3acdc7d2caf7"><a name="zh-cn_topic_0151921080_a33e3b7427b024df7922a3acdc7d2caf7"></a><a name="zh-cn_topic_0151921080_a33e3b7427b024df7922a3acdc7d2caf7"></a>keepcache</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_a16334e4f6fec4e79872c4a8b3a31d772"><a name="zh-cn_topic_0151921080_a16334e4f6fec4e79872c4a8b3a31d772"></a><a name="zh-cn_topic_0151921080_a16334e4f6fec4e79872c4a8b3a31d772"></a>可选值是1和0，表示是否要缓存已安装成功的那些RPM包及头文件，默认值为0，即不缓存。</p>
</td>
</tr>
<tr id="zh-cn_topic_0151921080_rc9c76f44bb7840b8b61a46b0854538b3"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_af751af3ed4cb4a189f209994d274dfe0"><a name="zh-cn_topic_0151921080_af751af3ed4cb4a189f209994d274dfe0"></a><a name="zh-cn_topic_0151921080_af751af3ed4cb4a189f209994d274dfe0"></a>debuglevel</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_a118e43ebde57468eb40f0af51b86d751"><a name="zh-cn_topic_0151921080_a118e43ebde57468eb40f0af51b86d751"></a><a name="zh-cn_topic_0151921080_a118e43ebde57468eb40f0af51b86d751"></a>设置dnf生成的debug信息。取值范围：[0-10]，数值越大会输出越详细的debug信息。默认值为2，设置为0表示不输出debug信息。</p>
</td>
</tr>
<tr id="zh-cn_topic_0151921080_rc12e82ae45524ba8aea5248e154a832a"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_adc7f634b391d4726808fe0b3354f969d"><a name="zh-cn_topic_0151921080_adc7f634b391d4726808fe0b3354f969d"></a><a name="zh-cn_topic_0151921080_adc7f634b391d4726808fe0b3354f969d"></a>clean_requirements_on_remove</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_ae9df2a3423504b4da46111a6e1162352"><a name="zh-cn_topic_0151921080_ae9df2a3423504b4da46111a6e1162352"></a><a name="zh-cn_topic_0151921080_ae9df2a3423504b4da46111a6e1162352"></a>删除在dnf remove期间不再使用的依赖项，如果软件包是通过DNF安装的，而不是通过显式用户请求安装的，则只能通过clean_requirements_on_remove删除软件包，即它是作为依赖项引入的。 默认值为True。</p>
</td>
</tr>
<tr id="zh-cn_topic_0151921080_r096417e2f0524024b93c722dab0113cd"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_p11584914871"><a name="zh-cn_topic_0151921080_p11584914871"></a><a name="zh-cn_topic_0151921080_p11584914871"></a>best</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_a406b4dd56fb7483ea43c7231aa2a7499"><a name="zh-cn_topic_0151921080_a406b4dd56fb7483ea43c7231aa2a7499"></a><a name="zh-cn_topic_0151921080_a406b4dd56fb7483ea43c7231aa2a7499"></a>升级包时，总是尝试安装其最高版本，如果最高版本无法安装，则提示无法安装的原因并停止安装。  默认值为True。</p>
</td>
</tr>
<tr id="zh-cn_topic_0151921080_r447c1e6abe344a719dd9e8b109c799fa"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_a6befc61e1a58499b96ecdcc96b0489d4"><a name="zh-cn_topic_0151921080_a6befc61e1a58499b96ecdcc96b0489d4"></a><a name="zh-cn_topic_0151921080_a6befc61e1a58499b96ecdcc96b0489d4"></a>obsoletes</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_a581b6f9d8f9b4ad7b62734f86f6d556e"><a name="zh-cn_topic_0151921080_a581b6f9d8f9b4ad7b62734f86f6d556e"></a><a name="zh-cn_topic_0151921080_a581b6f9d8f9b4ad7b62734f86f6d556e"></a>可选值1和0，设置是否允许更新陈旧的RPM包。认值为1，表示允许更新。</p>
</td>
</tr>
<tr id="zh-cn_topic_0151921080_r30106389463d4ba0bf505a6b78034b23"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_a51da18882a5b41ff8a5a328f73d186dd"><a name="zh-cn_topic_0151921080_a51da18882a5b41ff8a5a328f73d186dd"></a><a name="zh-cn_topic_0151921080_a51da18882a5b41ff8a5a328f73d186dd"></a>gpgcheck</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_addb19525458847cd90f1d1390b966701"><a name="zh-cn_topic_0151921080_addb19525458847cd90f1d1390b966701"></a><a name="zh-cn_topic_0151921080_addb19525458847cd90f1d1390b966701"></a>可选值1和0，设置是否进行gpg校验。默认值为1，表示需要进行校验。</p>
</td>
</tr>
<tr id="zh-cn_topic_0151921080_ra0a9a346638c4a1bb007bbbe59eaeea7"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_af01afb28195145988ff4ba218bfad29b"><a name="zh-cn_topic_0151921080_af01afb28195145988ff4ba218bfad29b"></a><a name="zh-cn_topic_0151921080_af01afb28195145988ff4ba218bfad29b"></a>plugins</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_a093f5fa9735a4e27a6bdbd2e1d59faee"><a name="zh-cn_topic_0151921080_a093f5fa9735a4e27a6bdbd2e1d59faee"></a><a name="zh-cn_topic_0151921080_a093f5fa9735a4e27a6bdbd2e1d59faee"></a>可选值1和0，表示启用或禁用dnf插件。默认值为1，表示启用dnf插件。</p>
</td>
</tr>
<tr id="zh-cn_topic_0151921080_r1fea2c77ef6e4c63a6ca076666eb8651"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_a66ecbecaa5494510b6b1304af3e4da43"><a name="zh-cn_topic_0151921080_a66ecbecaa5494510b6b1304af3e4da43"></a><a name="zh-cn_topic_0151921080_a66ecbecaa5494510b6b1304af3e4da43"></a>installonly_limit</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_aab5e9fba116044e4807c04ae55297cd1"><a name="zh-cn_topic_0151921080_aab5e9fba116044e4807c04ae55297cd1"></a><a name="zh-cn_topic_0151921080_aab5e9fba116044e4807c04ae55297cd1"></a>设置可以同时安装“installonlypkgs”指令列出包的数量。默认值为3，不建议降低此值。</p>
</td>
</tr>
</tbody>
</table>

## 修改repository部分<a name="zh-cn_topic_0151921080_sa94775dab64644bd8aa8e23415ff54f7"></a>

repository部分允许您定义定制化的软件源仓库，各个仓库的名称不能相同，否则会引起冲突。下面是\[repository\]部分的一个最小配置示例：

```
[repository]
name=repository_name
baseurl=repository_url
```

选项说明：

**表 2**  repository参数说明

<a name="zh-cn_topic_0151921080_t2df9dceb0ff64b2f8db8ec5cd779792a"></a>
<table><thead align="left"><tr id="zh-cn_topic_0151921080_r9162be1b9c5b451f8a7ff1466f5b8430"><th class="cellrowborder" valign="top" width="31.580000000000002%" id="mcps1.2.3.1.1"><p id="zh-cn_topic_0151921080_af95a9e18156646249707de3f94ac1b3c"><a name="zh-cn_topic_0151921080_af95a9e18156646249707de3f94ac1b3c"></a><a name="zh-cn_topic_0151921080_af95a9e18156646249707de3f94ac1b3c"></a>参数</p>
</th>
<th class="cellrowborder" valign="top" width="68.42%" id="mcps1.2.3.1.2"><p id="zh-cn_topic_0151921080_a8cc2e976bc794e86a279d3bae8f901c4"><a name="zh-cn_topic_0151921080_a8cc2e976bc794e86a279d3bae8f901c4"></a><a name="zh-cn_topic_0151921080_a8cc2e976bc794e86a279d3bae8f901c4"></a>说明</p>
</th>
</tr>
</thead>
<tbody><tr id="zh-cn_topic_0151921080_rbfa3a638cbc24c73ab13529149b75bb1"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_a4a0b069bbf624b09be3bdd08567c0445"><a name="zh-cn_topic_0151921080_a4a0b069bbf624b09be3bdd08567c0445"></a><a name="zh-cn_topic_0151921080_a4a0b069bbf624b09be3bdd08567c0445"></a>name=repository_name</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_a21ddbd0f48924c1eb7475cc34de2dc32"><a name="zh-cn_topic_0151921080_a21ddbd0f48924c1eb7475cc34de2dc32"></a><a name="zh-cn_topic_0151921080_a21ddbd0f48924c1eb7475cc34de2dc32"></a>软件仓库（repository ）描述的字符串。</p>
</td>
</tr>
<tr id="zh-cn_topic_0151921080_r00b7f4067dc94647941026719cd6f293"><td class="cellrowborder" valign="top" width="31.580000000000002%" headers="mcps1.2.3.1.1 "><p id="zh-cn_topic_0151921080_af53cdfe5f204471f956cdab7c466fa40"><a name="zh-cn_topic_0151921080_af53cdfe5f204471f956cdab7c466fa40"></a><a name="zh-cn_topic_0151921080_af53cdfe5f204471f956cdab7c466fa40"></a>baseurl=repository_url</p>
</td>
<td class="cellrowborder" valign="top" width="68.42%" headers="mcps1.2.3.1.2 "><p id="zh-cn_topic_0151921080_aa17154cd42524a1a8075e6414160a153"><a name="zh-cn_topic_0151921080_aa17154cd42524a1a8075e6414160a153"></a><a name="zh-cn_topic_0151921080_aa17154cd42524a1a8075e6414160a153"></a>软件仓库（repository ）的地址。</p>
<a name="zh-cn_topic_0151921080_ued0c249b843549a79bfa68170539c91e"></a><a name="zh-cn_topic_0151921080_ued0c249b843549a79bfa68170539c91e"></a><ul id="zh-cn_topic_0151921080_ued0c249b843549a79bfa68170539c91e"><li>使用http协议的网络位置：例如 http://path/to/repo</li><li>使用ftp协议的网络位置：例如 ftp://path/to/repo</li><li>本地位置：例如 file:///path/to/local/repo</li></ul>
</td>
</tr>
</tbody>
</table>

## 显示当前配置<a name="zh-cn_topic_0151921080_s23585ce056b94d4488c5f3acac04c4cf"></a>

-   要显示当前的配置信息：

    ```
    dnf config-manager --dump
    ```

-   要显示相应软件源的配置，首先查询repo id：

    ```
    dnf repolist
    ```

    然后执行如下命令，显示对应id的软件源配置，其中 _repository_ 为查询得到的repo id：

    ```
    dnf config-manager --dump repository
    ```

-   您也可以使用一个全局正则表达式，来显示所有匹配部分的配置：

    ```
    dnf config-manager --dump glob_expression
    ```