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Elasticsearch 启动报错信息一：
ERROR: [2] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
解决方法：
# vim /etc/sysctl.conf
添加下面配置：
vm.max_map_count=655360
并执行命令：
# sysctl -p
报错信息二：
ERROR: [1] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
解决方法：
切换到 root 用户
# ulimit -Hn 查看硬限制
# vim /etc/security/limits.conf
## 在末尾添加下面设置
* soft nofile 655350
* hard nofile 655350
退出用户重新登录，使配置生效
重新 ulimit -Hn 查看硬限制 会发现数值有 4096 改成 65535
# vim /etc/security/limits.d/90-nproc.conf
找到如下内容：
soft nproc 1024
修改为
soft nproc 2048
报错信息三：
org.elasticsearch.bootstrap.StartupException: Java.lang.IllegalStateException: failed to obtain node locks, tried [[/data/elasticsearch/data/elasticsearch]] with lock id [0]; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [1])?
解决方法：
在开启多个 elasticsearch 实例时，config/elasticsearch.yml 文件中新增一个配置变量：
[elsearch@Elk_Server elasticsearch]$ vim config/elasticsearch.yml
node.max_local_storage_nodes: 256
报错信息四：
ERROR: [1] bootstrap checks failed
[1]: system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk
[2019-03-01T16:20:49,025][INFO][o.e.n.Node] [node-data1] stopping …
[2019-03-01T16:20:49,081][INFO][o.e.n.Node] [node-data1] stopped
[2019-03-01T16:20:49,081][INFO][o.e.n.Node] [node-data1] closing …
[2019-03-01T16:20:49,100][INFO][o.e.n.Node] [node-data1] closed
解决方法：
CentOS6 不支持 SecComp，而 ES5.2.0 默认 bootstrap.system_call_filter 为 true
禁用：在 elasticsearch.yml 中配置 bootstrap.system_call_filter 为 false，注意要在 Memory 下面:
bootstrap.memory_lock: false
bootstrap.system_call_filter: false
：
