elasticsearch 学习系列一 安装

安装elasticsearch的步骤如下

1、下载elasticsearch安装包

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.6.0.tar.gz

2、解压安装包

tar -zxvf elasticsearch-6.6.0.tar.gz

3、启动elasticserarch

     进入安装bin目录

./elasticsearch　

如果出现以下错误

[2018-01-02T17:42:42,296][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException:can not run elasticsearch as root
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:125) ~[elasticsearch-6.1.1.jar:6.1.1]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-6.1.1.jar:6.1.1]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.1.1.jar:6.1.1]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.1.1.jar:6.1.1]
at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.1.1.jar:6.1.1]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-6.1.1.jar:6.1.1]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) ~[elasticsearch-6.1.1.jar:6.1.1]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:104) ~[elasticsearch-6.1.1.jar:6.1.1]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:171) ~[elasticsearch-6.1.1.jar:6.1.1]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:322) ~[elasticsearch-6.1.1.jar:6.1.1]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-6.1.1.jar:6.1.1]
... 6 more

 说明你是用root账号执行的。

出于安全考虑，elasticsearch建议用一个单独的账号去运行elasticsearch

4、新增账号

adduser yyy
passwd  yyy

添加权限

chown -R elasticsearch安装目录 yyy
su yyy
./elasticsearch (./elasticsearch -d 后台运行)

5、 如果这是报"max virtual memory areas vm.max_map_count[65530] is too low"

       这说明elasticsearch用户拥有的内存权限太小，至少需要262144

       解决办法：

       1、切换到root账号修改配置sysctl.conf

vi /etc/sysctl.conf

　　在最后一行添加

vm.max_map_count = 262144

　　执行命令

sysctl -p