es启动报错解决 maybe these locations are not writable or multiple nodes were started without increasing

es启动报错解决 maybe these locations are not writable or multiple nodes were started without increasing

1.启动报错 maybe these locations are not writable or multiple nodes were started without increasing

在使用elk的时候，有时候会因为服务器突然宕机，导致es无法重新启动。其中一个常见的错误便是maybe these locations are not writable or multiple nodes were started without increasing [[node.max_local_storage_nodes] (was [1])

具体的报错信息大致如下：

[elk@master elasticsearch-7.2.1]$ ./bin/elasticsearch
OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
[2021-08-13T11:02:10,661][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [master] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: failed to obtain node locks, tried [[/data/elasticsearch-7.2.1/data]] with lock id [0]; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [1])?
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:163) ~[elasticsearch-7.2.1.jar:7.2.1]
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-7.2.1.jar:7.2.1]
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-7.2.1.jar:7.2.1]
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-7.2.1.jar:7.2.1]
    at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-7.2.1.jar:7.2.1]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115) ~[elasticsearch-7.2.1.jar:7.2.1]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-7.2.1.jar:7.2.1]
Caused by: java.lang.IllegalStateException: failed to obtain node locks, tried [[/data/elasticsearch-7.2.1/data]] with lock id [0]; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [1])?
    at org.elasticsearch.env.NodeEnvironment.<init>(NodeEnvironment.java:298) ~[elasticsearch-7.2.1.jar:7.2.1]
    at org.elasticsearch.node.Node.<init>(Node.java:271) ~[elasticsearch-7.2.1.jar:7.2.1]
    at org.elasticsearch.node.Node.<init>(Node.java:251) ~[elasticsearch-7.2.1.jar:7.2.1]
    at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:221) ~[elasticsearch-7.2.1.jar:7.2.1]

这个错误的原因是因为之前用root用户启动了es，之后切换用户运行就会报这个错误，解决这个错误只需要删除根目录下data目录中的nodes文件，然后用其它用户启动就能解决了

2.启动报permission denied

具体报错信息如下：

[elk@testmachine root]$ 2021-09-27 10:51:02,939 main ERROR RollingFileManager (/home/elasticsearch/logs/my-application_server.json) java.io.FileNotFoundException: /home/elasticsearch/logs/my-application_server.json (Permission denied) java.io.FileNotFoundException: /home/elasticsearch/logs/my-application_server.json (Permission denied)
        at java.base/java.io.FileOutputStream.open0(Native Method)
        at java.base/java.io.FileOutputStream.open(FileOutputStream.java:291)
        at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:234)
        at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:155)
        at org.apache.logging.log4j.core.appender.rolling.RollingFileManager$RollingFileManagerFactory.createManager(RollingFileManager.java:640)
        at org.apache.logging.log4j.core.appender.rolling.RollingFileManager$RollingFileManagerFactory.createManager(RollingFileManager.java:608)
        at org.apache.logging.log4j.core.appender.AbstractManager.getManager(AbstractManager.java:113)
        at org.apache.logging.log4j.core.appender.OutputStreamManager.getManager(OutputStreamManager.java:114)
        at org.apache.logging.log4j.core.appender.rolling.RollingFileManager.getFileManager(RollingFileManager.java:188)
        at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:145)
        at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:61)
        at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:123)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:959)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:899)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:891)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:514)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:238)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:250)
        at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:547)
        at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:263)
        at org.elasticsearch.common.logging.LogConfigurator.configure(LogConfigurator.java:225)

从报错信息中可以看出是logs/my-application_server.json 这个文件的权限问题，可以进入到es的logs目录下通过ls -l命令查看所有文件的所属用户，会发现有些文件是属于root用户，这就是导致报错的原因

解决方法，回到根目录执行以下指令

chown -R elk:elk logs
chmod -R 777 logs

进入logs目录下查看是否所有文件都属于elk:elk用户

如果是的话，重启es，就能成功启动了