Elasticsearch启动报错

报错信息一：

ERROR: [2] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

解决方法：

# vim /etc/sysctl.conf

添加下面配置：

vm.max_map_count=655360

并执行命令：

# sysctl -p

报错信息二：

ERROR: [1] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]

解决方法：

切换到root用户

# ulimit -Hn  查看硬限制

# vim /etc/security/limits.conf 

#添加下面设置 hadoop是用户

elsearch soft nofile 65536
elsearch hard nofile 65536

退出用户重新登录，使配置生效

重新 ulimit -Hn  查看硬限制 会发现数值有4096改成65535

# vim /etc/security/limits.d/90-nproc.conf 

找到如下内容：

soft nproc 1024

修改为

soft nproc 2048