使用./elasticsearch启动es时，报错解决

ERROR: [3] bootstrap checks Failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
[2]: max number of threads [3795] for user [esuser] 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]

解决：

1. 首先打开limits.conf文件：vim /etc/security/limits.conf
2. 在end前贴入指令：

* soft nofile 65536
* hard nofile 131072
* soft nproc 2048
* hard nproc 4096