【问题一】使用helm安装Elasticsearch时提示权限不够
[root@k8s-master elasticsearch]# kubectl logs elasticsearch-master-0 -n efk OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release. {"type": "server", "timestamp": "2020-03-01T09:01:32,837Z", "level": "ERROR", "component": "o.e.b.ElasticsearchUncaughtExceptionHandler", "cluster.name": "elasticsearch", "node.name": "elasticsearch-master-0", "message": "uncaught exception in thread [main]", "stacktrace": ["org.elasticsearch.bootstrap.StartupException: ElasticsearchException[failed to bind service]; nested: AccessDeniedException[/usr/share/elasticsearch/data/nodes];", "at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:174) ~[elasticsearch-7.6.0.jar:7.6.0]", "at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:161) ~[elasticsearch-7.6.0.jar:7.6.0]", "at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-7.6.0.jar:7.6.0]", "at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:125) ~[elasticsearch-cli-7.6.0.jar:7.6.0]", "at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-7.6.0.jar:7.6.0]", "at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:126) ~[elasticsearch-7.6.0.jar:7.6.0]", "at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-7.6.0.jar:7.6.0]", "Caused by: org.elasticsearch.ElasticsearchException: failed to bind service",
【分析】
这是由于PV挂载目录权限不够导致，特别是HostPath类型，挂载在宿主机上的PV，很多时候会忘记赋予权限。
【解决】
找到PV对应服务器上的目录，更改权限即可（chmod -R 777 els）。
