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
