Elasticsearch启动报错

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　　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
##在末尾添加下面设置
* soft nofile 655350   
* hard nofile 655350
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

　　报错信息三：

org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: failed to obtain node locks, tried [[/data/elasticsearch/data/elasticsearch]] with lock id [0]; maybe these locations are not writable or multiple nodes were started without increasing [node.max_local_storage_nodes] (was [1])?
　　解决方法：
在开启多个elasticsearch 实例时，config/elasticsearch.yml文件中新增一个配置变量：

[elsearch@Elk_Server elasticsearch]$ vim config/elasticsearch.yml
node.max_local_storage_nodes: 256