关于修改的答案是正确的。然而，我认为应该提到的是，如果你激活了“基于项目的矩阵授权策略”，/var/lib/jenkins/config.xml看起来就像这样。删除/var/lib/jenkins/config.xml并重新启动jenkins也可以做到这一点。我还删除了/var/lib/jenkins/users中的用户，从头开始。

<authorizationStrategy class="hudson.security.ProjectMatrixAuthorizationStrategy">
    <permission>hudson.model.Computer.Configure:jenkins-admin</permission>
    <permission>hudson.model.Computer.Connect:jenkins-admin</permission>
    <permission>hudson.model.Computer.Create:jenkins-admin</permission>
    <permission>hudson.model.Computer.Delete:jenkins-admin</permission>
    <permission>hudson.model.Computer.Disconnect:jenkins-admin</permission>
    <!-- if this is missing for your user and it is the only one, bad luck -->
    <permission>hudson.model.Hudson.Administer:jenkins-admin</permission>
    <permission>hudson.model.Hudson.Read:jenkins-admin</permission>
    <permission>hudson.model.Hudson.RunScripts:jenkins-admin</permission>
    <permission>hudson.model.Item.Build:jenkins-admin</permission>
    <permission>hudson.model.Item.Cancel:jenkins-admin</permission>
    <permission>hudson.model.Item.Configure:jenkins-admin</permission>
    <permission>hudson.model.Item.Create:jenkins-admin</permission>
    <permission>hudson.model.Item.Delete:jenkins-admin</permission>
    <permission>hudson.model.Item.Discover:jenkins-admin</permission>
    <permission>hudson.model.Item.Read:jenkins-admin</permission>
    <permission>hudson.model.Item.Workspace:jenkins-admin</permission>
    <permission>hudson.model.View.Configure:jenkins-admin</permission>
    <permission>hudson.model.View.Create:jenkins-admin</permission>
    <permission>hudson.model.View.Delete:jenkins-admin</permission>
    <permission>hudson.model.View.Read:jenkins-admin</permission>
  </authorizationStrategy>

步骤1:进入目录cd .jenkins/secrets，然后你会得到一个'initialAdminPassword'。

step-2: nano initialAdminPassword

你会得到一个密码

关于修改的答案是正确的。然而，我认为应该提到的是，如果你激活了“基于项目的矩阵授权策略”，/var/lib/jenkins/config.xml看起来就像这样。删除/var/lib/jenkins/config.xml并重新启动jenkins也可以做到这一点。我还删除了/var/lib/jenkins/users中的用户，从头开始。

<authorizationStrategy class="hudson.security.ProjectMatrixAuthorizationStrategy">
    <permission>hudson.model.Computer.Configure:jenkins-admin</permission>
    <permission>hudson.model.Computer.Connect:jenkins-admin</permission>
    <permission>hudson.model.Computer.Create:jenkins-admin</permission>
    <permission>hudson.model.Computer.Delete:jenkins-admin</permission>
    <permission>hudson.model.Computer.Disconnect:jenkins-admin</permission>
    <!-- if this is missing for your user and it is the only one, bad luck -->
    <permission>hudson.model.Hudson.Administer:jenkins-admin</permission>
    <permission>hudson.model.Hudson.Read:jenkins-admin</permission>
    <permission>hudson.model.Hudson.RunScripts:jenkins-admin</permission>
    <permission>hudson.model.Item.Build:jenkins-admin</permission>
    <permission>hudson.model.Item.Cancel:jenkins-admin</permission>
    <permission>hudson.model.Item.Configure:jenkins-admin</permission>
    <permission>hudson.model.Item.Create:jenkins-admin</permission>
    <permission>hudson.model.Item.Delete:jenkins-admin</permission>
    <permission>hudson.model.Item.Discover:jenkins-admin</permission>
    <permission>hudson.model.Item.Read:jenkins-admin</permission>
    <permission>hudson.model.Item.Workspace:jenkins-admin</permission>
    <permission>hudson.model.View.Configure:jenkins-admin</permission>
    <permission>hudson.model.View.Create:jenkins-admin</permission>
    <permission>hudson.model.View.Delete:jenkins-admin</permission>
    <permission>hudson.model.View.Read:jenkins-admin</permission>
  </authorizationStrategy>

对于使用macOS的用户来说，新版本只能通过自制软件安装。所以为了休息，这个命令行必须使用:

brew services restart jenkins-lts

很多时候你没有权限编辑config.xml文件。

最简单的方法是返回config.xml，然后使用sudo命令删除。

使用命令sudo /etc/init.重启jenkinsd / jenkins重启

这将禁用Jenkins中的所有安全性，登录选项将消失

我发现有问题的文件位于/var/lib/jenkins中，名为config.xml，修改后解决了这个问题。