grub配置详解

GRUB2 配置文件详解

1. GRUB2配置文件

GRUB2 的配置文件通常为 /boot/grub2/grub.cfg,虽然此文件很灵活,但是我们并不需要手写所有内容。可以通过程序自动生成,或是直接修改生成之后的文件。

2. 简单配置

通常情况下简单配置文件 /etc/default/grub ,然后用程序 grub-mkconfig 来产生文件 grub.cfg
文件 /etc/default/grub 是一个 shell 脚本,通常仅是 KEY=value 这样的连续行。如果值包含空格或特殊字符,必须用 " 引用。详看 GRUB Manual: Simple configuration。其常用关键字如下:

2.1. GRUB_DEFAULT

默认菜单项。默认值为 0。可选值有:

说明
菜单项的数字序号,从 0 开始
saved GRUB_SAVEDEFAULT 保存的上次选择项
菜单项的唯一标识(menuentry … –id xxxx

2.2. GRUB_TIMEOUT

自启超时时间。默认值为 5。可选值有:

说明
0 不等待
-1 永久等待
其他 等待对应秒

2.3. GRUB_TIMEOUT_STYLE

倒计时显示风格。默认值为 menu。可选值有:

说明
menu 显示菜单
countdown 显示倒计时
hidden 隐藏

2.4. GRUB_DISTRIBUTOR

被用于生成菜单项的更多信息。

2.5. GRUB_TERMINAL

设置输入、输出终端类型。可选值有:

说明
console 控制台
serial 串口
serial_ 具体串口号
gfxterm 图形模式输出
vga_text VGA 文本输出

2.6. GRUB_CMDLINE_LINUX

添加到菜单项中的启动 linux 的命令行参数。

2.7. GRUB_DISABLE_RECOVERY

设置此选项为 true,禁止产生恢复模式菜单项。

2.8. GRUB_DISABLE_SUBMENU

默认情况下,grub-mkconfig 会将低版本内核放在高版本内核子菜单里。设置此选项为 true,所有菜单项都将出现在顶层。

2.9. GRUB_DISABLE_OS_PROBER

默认情况下,grub-mkconfig 会使用外部程序 os-prober 检测其他已安装的操作系统,并产生菜单项。设置此选项为 true来禁止它。

3. 直接修改

我们也可以直接修改由 grub-mkconfig 生成之后的 grub.cfg ,其由 GRUB 内建的脚本语言组成,和 GNU bash 语法非常相似,比如定义函数、判断语句等。以下列出一些可调用的命令,详看 GRUB Manual: Commands

注意:

  1. 命令

    其中个别命令只能在 grub.cfg 中使用,不能在命令行模式使用。比如 menuentry等。

  2. 指定设备

    定位一个文件,需要指定它所在设备分区与路径。指定设备的语法如下:

    1
    2
    (<device-type><device-number>,<partition-number>)

    注解:

    1. 设备类型,有如下几种常用类型:

      类型 说明
      hd 硬盘
      fd 3.5 英寸软盘
      nd 网络
      cd CD/DVD等
    2. BIOS能够识别的设备号,下标从 0 开始计数。比如 hd0 表示主硬盘,等价于 linux 的 /dev/hda

    3. 分区号,比如 modos2 表示第 2 个分区。下标从 1 开始计数。

3.1. menuentry

定义 GRUB 的菜单项。当选中菜单项时,GRUB 将执行括号内的命令。如果最后的命令返回成功,并且内核被加载时,将自动执行 boot 命令。此命令不能在命令行模式执行。语法格式如下:

1
2
3
menuentry <title> [--class=<class> …] [--users=<users>] 
[--unrestricted] [--hotkey=<key>] [--id=<id>] [<arg> …] { <command>; … }

注解:

  1. </li> </ol> <p>菜单项的显示名称。</p> <ol start="2"> <li><p>[–class=<class> …]</p> <p>将菜单项指定为某一类。可指定多个类别。不同的菜单主题可能会显示不同的菜单类别。</p> </li> <li><p>[–users=<users>]</p> <p>授予指定用户访问菜单项的权利。</p> </li> <li><p>[–unrestricted]</p> <p>允许所有用户访问此菜单项。</p> </li> <li><p>[–hotkey=<key>]</p> <p>给菜单项指定一个快捷键。</p> </li> <li><p>[–id=<id>]</p> <p>给菜单项指定一个唯一的 <code>ASCII</code> 字符串标识。</p> </li> <li><p>[<arg> …]</p> <p>和 <title> 一起作为参数,传递给大括号里将要执行的命令。<title> 总是被指定为 <code>$1</code>。</p> </li> </ol> </blockquote> <h2 id="3-2-boot"><a href="#3-2-boot" class="headerlink" title="3.2. boot"></a>3.2. boot</h2><p>启动已加载的内核。</p> <h2 id="3-3-help"><a href="#3-3-help" class="headerlink" title="3.3. help"></a>3.3. help</h2><p>显示内建命令的帮助信息。语法格式如下:</p> <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">help [<pattern> …]</span><br><span class="line"></span><br></pre></td></tr></table></figure> <blockquote> <p>注解:</p> <ol> <li><p>[<pattern> …]</p> <p>如果省略,则显示所有命令的简短描述。否则,显示指定命令的详细描述。</p> </li> </ol> </blockquote> <h2 id="3-4-linux"><a href="#3-4-linux" class="headerlink" title="3.4. linux"></a>3.4. linux</h2><p>从指定文件加载内核,并传递启动参数。任何 <code>initrd</code> 必须在此命令后重加载。语法格式如下:</p> <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">linux <file> …</span><br><span class="line"></span><br></pre></td></tr></table></figure> <h2 id="3-5-initrd"><a href="#3-5-initrd" class="headerlink" title="3.5. initrd"></a>3.5. initrd</h2><p>为 <code>linux</code> 内核加载初始的 <code>ramdisk</code>,并在 <code>linux</code> 启动的内存区域,设置恰当的参数。语法格式如下:</p> <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">initrd <file></span><br><span class="line"></span><br></pre></td></tr></table></figure> <h2 id="3-6-search"><a href="#3-6-search" class="headerlink" title="3.6. search"></a>3.6. search</h2><p>查找设备。语法格式如下:</p> <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">search [--file|--label|--fs-uuid] [--set [<var>]] [--no-floppy] <name></span><br><span class="line"></span><br></pre></td></tr></table></figure> <blockquote> <p>注解:</p> <ol> <li><p>[–file|–label|–fs-uuid]</p> <p>分别表示按文件、文件系统标志、文件系统 <code>UUID</code> 查找设备。</p> </li> <li><p>[–set [<var>]]</p> <p>第一个找到的设备会被设置为环境变量 <code>var</code> 的值。默认变量是 <code>root</code>。</p> </li> <li><p>[–no-floppy]</p> <p>防止搜索软盘。</p> </li> </ol> </blockquote> <h2 id="3-7-set"><a href="#3-7-set" class="headerlink" title="3.7. set"></a>3.7. set</h2><p>设置环境变量。语法格式如下:</p> <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">set [<envvar>=<value>]</span><br><span class="line"></span><br></pre></td></tr></table></figure> <blockquote> <p>注解:</p> <ol> <li><p>[<envvar>=<value>]</p> <p>如果省略此参数,打印所有变量。</p> </li> <li><p>根目录标识</p> <p>指定根目录后,可以像 <code>linux</code> 的绝对路径的方式去定位一个文件。语法格式如下:</p> <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">set root=(<device-type><device-number>,<partition-number>)</span><br><span class="line"></span><br></pre></td></tr></table></figure></li> </ol> </blockquote> <h2 id="3-8-cat"><a href="#3-8-cat" class="headerlink" title="3.8. cat"></a>3.8. cat</h2><p>显示文件内容。</p> <h2 id="3-9-ls"><a href="#3-9-ls" class="headerlink" title="3.9. ls"></a>3.9. ls</h2><p>列出设备或文件。语法格式如下:</p> <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">ls [<arg> …]</span><br><span class="line"></span><br></pre></td></tr></table></figure> <blockquote> <p>注解:</p> <ol> <li><p>[<arg> …]</p> <p>如果没有参数,则显示所有 GRUB 已知的设备。否则根据参数显示设备或者文件。</p> </li> </ol> </blockquote> <h2 id="3-10-lsmod和insmod"><a href="#3-10-lsmod和insmod" class="headerlink" title="3.10. lsmod和insmod"></a>3.10. lsmod和insmod</h2><p>显示或插入指定的动态模块。语法格式如下:</p> <figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">lsmod</span><br><span class="line">insmod <module></span><br><span class="line"></span><br></pre></td></tr></table></figure> </div> </div> <div class="copyright"> <p><span>本文标题:</span><a href="/linux/debian/grub-cfg/">grub配置详解</a></p> <p><span>文章作者:</span> <a title="访问 阿帅 的个人博客">阿帅</a> </p> <p><span>发布时间:</span>2023年05月25日 - 20时57分</p> <p><span>最后更新:</span>2023年05月25日 - 21时02分</p> <p> <span>原始链接:</span><a class="post-url" href="/linux/debian/grub-cfg/" title="grub配置详解">https://chengshea.github.io/linux/debian/grub-cfg/</a> <span class="copy-path" data-clipboard-text="原文: https://chengshea.github.io/linux/debian/grub-cfg/ 作者: 阿帅" title="点击复制文章链接"><i class="fa fa-clipboard"></i></span> <script src="/js/clipboard.min.js"></script> <script> var clipboard = new Clipboard('.copy-path'); </script> </p> <p> <span>许可协议:</span><i class="fa fa-creative-commons"></i> <a rel="license noopener" target="_blank" href="http://creativecommons.org/licenses/by-nc-sa/3.0/cn/" title="中国大陆 (CC BY-NC-SA 3.0 CN)" target = "_blank">"署名-非商用-相同方式共享 3.0"</a> 转载请保留原文链接及作者。 </p> </div> <div id="div1" onmouseenter="showDiv2()" onmouseleave="hideDiv2()"> 点击打赏 <div id="div2" style="display: none;"> <img src='/img/123.gif' alt="菜币"> <div >会心一笑</div> </div> </div> <script> function showDiv2() { var div2 = document.getElementById("div2"); div2.style.display = "block"; } function hideDiv2() { var div2 = document.getElementById("div2"); div2.style.display = "none"; } </script> <nav id="article-nav"> <a href="/services/database/influxdb/influxdb-zabbix/" id="article-nav-newer" class="article-nav-link-wrap"> <strong class="article-nav-caption"><</strong> <div class="article-nav-title"> influxdb存放zabbix监控数据 </div> </a> <a href="/lang/stable-diffusion/models/revAnimated/" id="article-nav-older" class="article-nav-link-wrap"> <div class="article-nav-title">revAnimated models</div> <strong class="article-nav-caption">></strong> </a> </nav> </article> <div id="toc" class="toc-article"> <strong class="toc-title">文章目录</strong> <ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#GRUB2-%E9%85%8D%E7%BD%AE%E6%96%87%E4%BB%B6%E8%AF%A6%E8%A7%A3"><span class="toc-number">1.</span> <span class="toc-text">GRUB2 配置文件详解</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#2-1-GRUB-DEFAULT"><span class="toc-number">1.1.</span> <span class="toc-text">2.1. GRUB_DEFAULT</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-2-GRUB-TIMEOUT"><span class="toc-number">1.2.</span> <span class="toc-text">2.2. GRUB_TIMEOUT</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-3-GRUB-TIMEOUT-STYLE"><span class="toc-number">1.3.</span> <span class="toc-text">2.3. GRUB_TIMEOUT_STYLE</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-4-GRUB-DISTRIBUTOR"><span class="toc-number">1.4.</span> <span class="toc-text">2.4. GRUB_DISTRIBUTOR</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-5-GRUB-TERMINAL"><span class="toc-number">1.5.</span> <span class="toc-text">2.5. GRUB_TERMINAL</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#2-6-GRUB-CMDLINE-LINUX"><span class="toc-number">1.6.</span> <span class="toc-text">2.6. 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