[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536] 切换到root用户，编辑limits.conf添加如下内容
vi /etc/security/limits.conf * soft nofile 65536 * hard nofile 65536[2]: max number of threads [3818] for user [es] is too low, increase to at least [4096] 最大线程个数太低。修改配置文件etc/security/limits.conf，增加配置
* soft nproc 4096 * hard nproc 4096[3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] 修改/etc/sysctl.conf文件，增加配置vm.max_map_count=262144
vi /etc/sysctl.conf sysctl -p执行命令sysctl -p生效
[4]: system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk
问题原因：因为Centos6不支持SecComp，而ES5.2.1默认bootstrap.system_call_filter为true进行检测，所以导致检测失败，失败后直接导致ES不能启动
解决方法：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