centos7下安装elasticSearch错误总结(单节点模式)

1、首先确定你安装了jdk，版本需要1.8以上

2、上传elasticsearchjar包，只需配置一个文件即可

修改配置文件config/elasticsearch.yml
    network.host: 192.168.100.211

3、启动测试

进入到elasticsearch主目录执行   bin/elasticsearch

4、报错

os::commit_memory(0x000000008a660000, 1973026816, 0) failed; error='Cannot allocate memory' (errno=12)

原因：由于elasticsearch5.0以上默认分配jvm空间大小为2g，修改jvm空间分配
解决方案：

5、配好之后再次启动 bin/elasticsearch 报如下错

#出现错误
    [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]

解决办法 设置如下2个参数 
#用户最大可创建文件数太小

sudo vi /etc/security/limits.conf
    * soft nofile 65536
    * hard nofile 65536

#最大虚拟内存太小
    sudo vi /etc/sysctl.conf 
    vm.max_map_count=262144
6、重启linux
    shutdown -r now

7、如果不是root运行也会报错

Caused by: java.lang.RuntimeException: can not run elasticsearch as root

at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:100) ~[elasticsearch-5.1.1.jar:5.1.1]

at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:176) ~[elasticsearch-5.1.1.jar:5.1.1]

at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:306) ~[elasticsearch-5.1.1.jar:5.1.1]

at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-5.1.1.jar:5.1.1]

解决：新建一个用户

adduser xxx

password xxx

切换用户 用普通用户访问 结果OK