elasticsearch-02.使用logstash将mysql数据库中的数据同步至elasticsearch

1.安装logstash

• 执行以下脚本，下载安装包
  注意版本，本人使用的是elastaic6.2.4，logstash的版本也是6.2.4

  wget https://artifacts.elastic.co/downloads/logstash/logstash-6.2.4.tar.gz

• 执行以下命令，解压安装包
  tar -xzvf logstash-6.2.4.tar.gz


2.安装插件

因为要从mysql中取数据，输出到elasticsearch，故需要安装以下两款插件
logstash-input-jdbc
logstash-output-elasticsearch

• 进入logstash的bin文件夹下，执行以下两个命令，安装上述两款插件

   ./logstash-plugin install logstash-input-jdbc
   ./logstash-plugin install logstash-output-elasticsearch

安装完成后会有成功提示

3.安装mysql驱动

下载mysql-connector-java-5.1.6.jar，上传至logstash的bin文件夹下。

4.配置logstash conf文件

• 在logstash的bin文件夹下创建mysql-es.conf文件，内容如下：

  input{
       jdbc {
           jdbc_driver_library => "mysql-connector-java-5.1.6.jar"
           jdbc_driver_class => "com.mysql.jdbc.Driver"
           jdbc_connection_string => "jdbc:mysql://192.168.1.15:3306/test"
           jdbc_user => "test"
           jdbc_password => "test"
           jdbc_paging_enabled => "true"
           jdbc_page_size => "1000"
           jdbc_default_timezone =>"Asia/Shanghai"
           schedule => "* * * * *"
           statement => "select * from test where gmt_modified > :sql_last_value order by id
           "
           use_column_value => true
           tracking_column => "updatetime"
           last_run_metadata_path => "./logstash_jdbc_last_run"
         } 
  } 
  output{
      elasticsearch {
          hosts => "192.168.1.103:9200"
          index => "test"
          user => "elastic"
          password => "es_password"
          document_id => "%{id}"
          document_type => "order"
       }
       stdout {
          codec => json_lines
       }
   } 

5.开始同步

• 进入logstash的bin目录下，执行以下命令，开始同步数据到elsasticsearch

./logstash -f mysql-es.conf

然后logstash就默默开始同步了。

6.如果同步不小心中断了，我们得切换到更新模式了

elasticsearch中如果该id不存在则创建，如果存在则更新
mysql-es.conf需要修改成如下样子：

input{
     jdbc {
         jdbc_driver_library => "mysql-connector-java-5.1.6.jar"
         jdbc_driver_class => "com.mysql.jdbc.Driver"
         jdbc_connection_string => "jdbc:mysql://192.168.1.102:3306/caibaotc"
         jdbc_user => "test"
         jdbc_password => "test"
         jdbc_paging_enabled => "true"
         jdbc_page_size => "500"
         jdbc_default_timezone =>"Asia/Shanghai"
         schedule => "* * * * *"
         statement => "select * from test where gmt_modified > :sql_last_value order by id"
         use_column_value => true
         tracking_column => "gmt_modified"
         last_run_metadata_path => "./logstash_jdbc_last_run"
     codec => plain{ charset => "UTF-8" }
       } 
} 
output{
      elasticsearch {
         action => "update"
         doc_as_upsert => true
         hosts => ["192.168.1.11:9200","192.168.1.12:9200","192.168.1.13:9200"]
         index => "test"
         document_id => "%{id}"
         document_type => "order"
     codec => plain{ charset => "UTF-8" }
      }
     # stdout {
     #    codec => json_lines
    # }
 } 

参考：
https://www.elastic.co/guide/en/logstash/6.3/output-plugins.html
https://www.elastic.co/guide/en/logstash/6.3/plugins-inputs-jdbc.html