步骤一：修改配置文件

找到Jenkins下的config.xml文件，如下例子，采用的是Tomcat+Jenkins.war包部署后，会在root目录下，有一个隐藏的.jenkins目录

[root@lvjing ~]# ls -al
总用量 222716
dr-xr-x---. 26 root root      4096 3月  30 14:50 .
dr-xr-xr-x. 17 root root       244 5月  18 2022 ..
-rw-------   1 root root     16048 3月  29 16:55 .bash_history
-rw-r--r--.  1 root root        18 5月  11 2019 .bash_logout
-rw-r--r--.  1 root root       176 5月  11 2019 .bash_profile
-rw-r--r--.  1 root root       176 5月  11 2019 .bashrc
drwx------   4 root root        28 4月  12 2021 .cache
drwxr-x---   4 root root        32 4月  20 2021 .config
-rw-r--r--.  1 root root       100 5月  11 2019 .cshrc
drwx------   2 root root        25 6月  13 2022 .docker
drwxr-x---  15 root root      4096 3月  30 16:13 .jenkins
drwxr-xr-x   3 root root        24 4月  12 2021 .m2
...

进入到.jenkins目录，就能找到config.xml

[root@lvjing .jenkins]# ls
caches                                                       nodeMonitors.xml
config.xml                                                   nodes
credentials.xml                                              org.jenkinsci.plugins.docker.commons.tools.DockerTool.xml
fingerprints                                                 org.jenkinsci.plugins.gitclient.JGitApacheTool.xml
hudson.model.UpdateCenter.xml                                org.jenkinsci.plugins.gitclient.JGitTool.xml
hudson.plugins.git.GitTool.xml                               org.jenkinsci.plugins.workflow.flow.FlowExecutionList.xml
hudson.plugins.gradle.Gradle.xml                             plugins
hudson.tasks.Ant.xml                                         queue.xml
hudson.tasks.Maven.xml                                       queue.xml.bak
identity.key.enc                                             ru.yandex.qatools.allure.jenkins.tools.AllureCommandlineInstallation.xml
jenkins.install.InstallUtil.lastExecVersion                  secret.key
jenkins.install.UpgradeWizard.state                          secret.key.not-so-secret
jenkins.model.JenkinsLocationConfiguration.xml               secrets
jenkins.mvn.GlobalMavenConfig.xml                            tools
jenkins.security.apitoken.ApiTokenPropertyConfiguration.xml  updates
jenkins.security.QueueItemAuthenticatorConfiguration.xml     userContent
jenkins.security.UpdateSiteWarningsConfiguration.xml         users
jenkins.telemetry.Correlator.xml                             workflow-libs
jobs                                                         workspace
logs

编辑config.xml文档，将对应的内容修改如下

<useSecurity>true</useSecurity>
 <authorizationStrategy class="hudson.security.FullControlOnceLoggedInAuthorizationStrategy">
   <denyAnonymousReadAccess>true</denyAnonymousReadAccess>
 </authorizationStrategy>
 <securityRealm class="hudson.security.HudsonPrivateSecurityRealm">
   <disableSignup>true</disableSignup>
   <enableCaptcha>false</enableCaptcha>
 </securityRealm>