ElasticSearch启动报错如下：
ERROR: [4] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
[2]: max number of threads [3870] for user [elk] is too low, increase to at least [4096]
[3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[4]: 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

第[1]-[2]项问题解决：
使用root用户，编辑文件/etc/security/limits.conf，在文件的末尾处，增加如下参数
elk hard nofile 65536 #elk 为运行ElasticSearch程序的用户
elk soft nofile 65536 #elk 为运行ElasticSearch程序的用户
elk hard nproc 4096 #elk 为运行ElasticSearch程序的用户
elk soft nproc 4096 #elk 为运行ElasticSearch程序的用户

保存并退出编辑

第[3]项问题解决：
使用root用户，编辑文件/etc/sysctl.conf，在文件的末尾处，增加如下参数
vm.max_map_count = 655360
保存并退出编辑
sysctl -p //使配置生效

第[4]项问题解决：
编辑elasticsearch目录下，config/elasticsearch.yml文件，修改如下的参数下如：
#cluster.initial_master_nodes: ["node-1", "node-2"]
cluster.initial_master_nodes: ["node-1"]
保存并退出编辑

然后使用elk用户重新启动ElasticSearch

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ElasticSearch启动报错 ERROR: [4] bootstrap checks failed

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