linux部署elasticsearch6.x可能遇到的问题

[4] bootstrap checks failed
[1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]
[2]: max number of threads [1024] 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]
[4]: system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk

1.[1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]

sudo vi /etc/security/limits.conf
修改如下：
* soft nofile 65536
* hard nofile 131072
* soft nproc 2048
* hard nproc 4096

2.[2]:max number of threads [1024] for user [esuser] is too low, increase to at least [4096]

sudo vi /etc/security/limits.d/90-nproc.conf
配置如下：
*          soft    nproc     4096
root       soft    nproc     unlimited

3.[3]max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

sudo vi /etc/sysctl.conf
配置如下：
vm.max_map_count=262144
配置保存后执行：
sudo vi  /etc/sysctl.conf

4.[4] bootstrap checks failed

[4]system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk

sudo vi elasticsearch.yml
添加如下配置：
bootstrap.memory_lock:  false
bootstrap.system_call_filter: false

说明：如果具有root用户权限，以上所有操作可以直接执行vi 命令，不用加sudo，直接执行 vi /etc/security/limits.conf 等

以上关于线程数和内存等信息的配置，如果服务器内存充足，可适当增大，以免反复修改