elasticsearch 安装常见问题解决办法

本文章记录安装es过程中碰到的各种常见问题及解决方案

目录

本文章记录安装es过程中碰到的各种常见问题及解决方案

1、./elasticsearch-7.6.1/bin/elasticsearch 启动报以杀死  这个问题 没有生成其他日志 只有gc的，根据gc 日志分析 分配内存问题

 解决:

2、type [START_OBJECT] but found [VALUE_STRING]];

解决：

3、

[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535][2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144][3]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts,

这里是三个问题

[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]

[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

[3]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts,

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1、./elasticsearch-7.6.1/bin/elasticsearch 启动报以杀死  这个问题 没有生成其他日志 只有gc的，根据gc 日志分析 分配内存问题

Java HotSpot(TM) 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
已杀死

 解决:

编辑   vi config/jvm.options  文件

找到

-Xms1g
-Xmx1g

修改成你本身机器所能承受的范围即可 如 512m

2、type [START_OBJECT] but found [VALUE_STRING]];

[elsearch@k8a elasticsearch-7.6.1]$ ./bin/elasticsearch
Java HotSpot(TM) 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
Exception in thread "main" 2020-04-02 10:33:21,459 main ERROR No Log4j 2 configuration file found. Using default configuration (logging only errors to the console), or user programmatically provided configurations. Set system property 'log4j2.debug' to show Log4j 2 internal initialization logging. See https://logging.apache.org/log4j/2.x/manual/configuration.html for instructions on how to configure Log4j 2
SettingsException[Failed to load settings from [elasticsearch.yml]]; nested: ParsingException[Failed to parse object: expecting token of type [START_OBJECT] but found [VALUE_STRING]];
    at org.elasticsearch.common.settings.Settings$Builder.loadFromStream(Settings.java:1097)
    at org.elasticsearch.common.settings.Settings$Builder.loadFromPath(Settings.java:1070)
    at org.elasticsearch.node.InternalSettingsPreparer.prepareEnvironment(InternalSettingsPreparer.java:83)
    at org.elasticsearch.cli.EnvironmentAwareCommand.createEnv(EnvironmentAwareCommand.java:100)
    at org.elasticsearch.cli.EnvironmentAwareCommand.createEnv(EnvironmentAwareCommand.java:91)
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86)
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:125)
    at org.elasticsearch.cli.Command.main(Command.java:90)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:126)
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92)
Caused by: ParsingException[Failed to parse object: expecting token of type [START_OBJECT] but found [VALUE_STRING]]
    at org.elasticsearch.common.xcontent.XContentParserUtils.ensureExpectedToken(XContentParserUtils.java:78)
    at org.elasticsearch.common.settings.Settings.fromXContent(Settings.java:617)
    at org.elasticsearch.common.settings.Settings.access$400(Settings.java:82)
    at org.elasticsearch.common.settings.Settings$Builder.loadFromStream(Settings.java:1093)
 

解决：

这个是因为编辑   vi config/elasticsearch.yml  的key 和value 写错了导致， 仔细检查你所修改的地方就可以发现问题

提示，key 和value 之间除了：还有个 空格 如：    key: (空格)value

3、

[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[3]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts,

这里是三个问题

[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[3]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured
ERROR: Elasticsearch did not exit normally - check the logs at /home/elsearch/elasticsearch-7.6.1/logs/elasticsearch.log

[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]

解决 

编辑文件 用root 用户

 vi /etc/security/limits.conf

 请将es修改为你对应的 启动 elasticsearch 用户名 

es hard nofile 65536
es soft nofile 65536

重启服务器  在重新启动es即可

[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

解决：

切换到root用户修改配置sysctl.conf

vi /etc/sysctl.conf 

添加下面配置：

vm.max_map_count=655360

并执行命令：

sysctl -p

然后，重新启动elasticsearch，即可启动成功。

[3]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts,

解决

修改 

vi /conf/elasticsearch.yml

找到  默认是有注释的，把注释去掉 后保存  

cluster.initial_master_nodes: ["node-1"]

重启es 即可