启动./elasticsearch后报错：
1.bootstrap checks failed
max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
找到/etc/security文件夹下的limits.conf文件，通过vi或者vim进行编辑，添加以下信息：
* soft nofile 65536
* hard nofile 65536
* soft nproc 4096
* hard nproc 4096
2.max number of threads [2048] for user [tongtech] is too low, increase to at least [4096]
找到**/etc/security/limits.d**的文件夹下中的文件进行编辑，我这里是20-nproc.conf，编辑将里面的数改为4096，如下：
然后保存退出，1,2点改好后，重新登录之后生效。
3.max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
找到/etc文件夹下的sysctl.conf文件进行编辑，添加以下信息或者修改信息：vm.max_map_count=655360
然后保存退出，进行sysctl -p进行确认，成功如下：
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