elasticsearch-6.0.0 安装的问题

问题一：
ERROR: bootstrap checks failed
max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]
max number of threads [1024] for user [lishang] likely too low, increase to at least [2048]
解决：
切换到root用户，编辑limits.conf 添加类似如下内容
vi /etc/security/limits.conf 
添加如下内容:
* soft nofile 65536
* hard nofile 131072
* soft nproc 2048
* hard nproc 4096

问题二：
max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]

解决：
切换到root用户修改配置sysctl.conf
vi /etc/sysctl.conf 
添加下面配置：
vm.max_map_count=655360
并执行命令：
sysctl -p