Elasticsearch5.4 版本安装错误

问题一：

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

修改配置文件：

sudo vim /etc/sysctl.conf

加入：

vm.max_map_count=262144

保存即可

问题二：

max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]

这个问题

sudo vim /etc/security/limits.conf

加入以下两行：

es hard nofile 65536
es soft nofile 65536

es这里为用户名

然后重启启动elasticsearch即可

max number of threads [1024] for user [lish] likely too low, increase to at least [2048]

问题三：max number of threads [1024] for user [lish] likely too low, increase to at least [2048]
解决：切换到root用户，进入limits.d目录下修改配置文件。
vi /etc/security/limits.d/90-nproc.conf 
修改如下内容：
* soft nproc 1024
#修改为
* soft nproc 2048
问题四：

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

解决：

vim config/elasticsearch.yml

bootstrap.system_call_filter: false