我正在使用弹性堆栈 5.1。
我安装了带有 xpack 的 elasticsearch 和 kibana， 它们正在工作。我还按照所需的安装顺序安装了 logstash 和 beats。
安装beats后，对我公司的VPN和代理进行了一些更改，我的elasticsearch和kibana停止工作，服务甚至无法启动。
我删除了让 ES 和 kibana 工作的 x-pack，但是当我再次安装 x-pack 时，ES 和 kibana 停止工作。我应该怎么办？
日志说无法加载 xpack 插件：
[2017-01-26T11:34:12,963][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: ElasticsearchException[Failed to load plugin class [org.elasticsearch.xpack.XPackPlugin]]; nested: InvocationTargetException; nested: AccessDeniedException[/etc/elasticsearch/x-pack/system_key];
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:125) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:122) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.cli.Command.main(Command.java:88) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:89) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:82) ~[elasticsearch-5.1.2.jar:5.1.2]
Caused by: org.elasticsearch.ElasticsearchException: Failed to load plugin class [org.elasticsearch.xpack.XPackPlugin]
at org.elasticsearch.plugins.PluginsService.loadPlugin(PluginsService.java:384) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.plugins.PluginsService.loadBundles(PluginsService.java:336) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:132) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.node.Node.<init>(Node.java:294) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.node.Node.<init>(Node.java:229) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Bootstrap$6.<init>(Bootstrap.java:214) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:214) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:306) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-5.1.2.jar:5.1.2]
... 6 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:?]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_121]
at org.elasticsearch.plugins.PluginsService.loadPlugin(PluginsService.java:373) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.plugins.PluginsService.loadBundles(PluginsService.java:336) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:132) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.node.Node.<init>(Node.java:294) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.node.Node.<init>(Node.java:229) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Bootstrap$6.<init>(Bootstrap.java:214) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:214) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:306) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-5.1.2.jar:5.1.2]
... 6 more
Caused by: java.nio.file.AccessDeniedException: /etc/elasticsearch/x-pack/system_key
at sun.nio.fs.UnixException.translateToIOException(UnixException.java:84) ~[?:?]
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102) ~[?:?]
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107) ~[?:?]
at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214) ~[?:?]
at java.nio.file.Files.newByteChannel(Files.java:361) ~[?:1.8.0_121]
at java.nio.file.Files.newByteChannel(Files.java:407) ~[?:1.8.0_121]
at java.nio.file.Files.readAllBytes(Files.java:3152) ~[?:1.8.0_121]
at org.elasticsearch.xpack.security.crypto.CryptoService.readSystemKey(CryptoService.java:160) ~[?:?]
at org.elasticsearch.xpack.security.crypto.CryptoService.<init>(CryptoService.java:112) ~[?:?]
at org.elasticsearch.xpack.security.Security.<init>(Security.java:191) ~[?:?]
at org.elasticsearch.xpack.XPackPlugin.<init>(XPackPlugin.java:193) ~[?:?]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:?]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_121]
at org.elasticsearch.plugins.PluginsService.loadPlugin(PluginsService.java:373) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.plugins.PluginsService.loadBundles(PluginsService.java:336) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:132) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.node.Node.<init>(Node.java:294) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.node.Node.<init>(Node.java:229) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Bootstrap$6.<init>(Bootstrap.java:214) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:214) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:306) ~[elasticsearch-5.1.2.jar:5.1.2]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-5.1.2.jar:5.1.2]
... 6 more