在Tomcat上启动Jenkins时遭遇InstanceIdentity单例缺失错误

Hey there, let's tackle this InstanceIdentity singleton issue you're hitting when firing up Jenkins on Tomcat. This error usually pops up when Jenkins can't initialize its identity key pair properly—often tied to file permissions or corrupted Jenkins home directory files. Here are the most common fixes to get you back up and running:

Common Fixes to Try #

• Check Jenkins Home Directory Permissions
  Make sure the user running Tomcat has full read/write access to your Jenkins home folder. If Tomcat can't write to this directory, it can't generate or access the InstanceIdentity files. On Linux systems, you can run something like:

  chown -R tomcat:tomcat /path/to/your/jenkins_home
  chmod -R 755 /path/to/your/jenkins_home
  

  Adjust the user/group and path to match your specific setup.

• Delete Corrupted InstanceIdentity Files
  Sometimes the identity files get corrupted. Navigate to your Jenkins home directory, look for the identity.key.enc and instance-identity.xml files, delete them, then restart Tomcat. Jenkins will automatically regenerate these files on startup.

• Verify Jenkins and Tomcat Compatibility
  Double-check that your Jenkins version is compatible with the Tomcat version you're using. Mismatched versions can cause odd initialization issues like this one.

• Rule Out Plugin Conflicts
  If you recently added or updated plugins, try starting Jenkins with plugins disabled to eliminate conflicts. You can do this by adding --disable-plugins to your Jenkins startup arguments, or by temporarily renaming the plugins folder in your Jenkins home directory.

Error Details You Provided #

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Stack Trace #

java.lang.AssertionError: InstanceIdentity is missing its singleton 
at org.jenkinsci.main.modules.instance_identity.InstanceIdentity.get(InstanceIdentity.java:133) 
at org.jenkinsci.main.modules.instance_identity.InstanceIdentityRSAProvider.getKeyPair(InstanceIdentityRSAProvider.java:23) 
at jenkins.model.identity.InstanceIdentityProvider$KeyTypes.get(InstanceIdentityProvider.java:161) 
at jenkins.model.identity.InstanceIdentityProvider$KeyTypes.getKeyPair(InstanceIdentityProvider.java:210) 
at jenkins.model.identity.IdentityRootAction.getUrlName(IdentityRootAction.java:42) 
at jenkins.model.Jenkins.getUnprotectedRootActions(Jenkins.java:4695) 
at jenkins.model.Jenkins.isSubjectToMandatoryReadPermissionCheck(Jenkins.java:4667) 
at jenkins.model.Jenkins.getTarget(Jenkins.java:4645) 
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:674) 
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845) 
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649) 
at org.kohsuke.stapler.Stapler.service(Stapler.java:238) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) 
Caused: javax.servlet.ServletException: Servlet execution threw an exception 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:238) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154) 
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:157) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:105) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84) 
at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51) 
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) 
at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117) 
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) 
at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125) 
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) 
at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:135) 
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) 
at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271) 
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) 
at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93) 
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) 
at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249) 
at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67) 
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87) 
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:90) 
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 
at org.apache.catalina.core.ApplicationFilterChain.

内容的提问来源于stack exchange，提问作者Suresh