Logstash无法连接MySQL数据库

Question

我正在尝试使用logstash 同步MySQL 数据库和Elasticsearch 之间的数据。为此，我创建了一个docker-compose文件，为 Elasticsearch、MySQL 和 Logstash 创建容器。

这是文件：

docker-compose.yml

version: '3.1'

services:
   elasticsearch:
     image: docker.elastic.co/elasticsearch/elasticsearch:7.1.1
     container_name: pelasticsearch
     environment:
     - discovery.type=single-node
     - cluster.name=docker-cluster
     - bootstrap.memory_lock=true
     - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
     ulimits:
       memlock:
         soft: -1
         hard: -1
     volumes:
     - elasticsearch:/home/django/elasticsearch
     ports:
     - 9200:9200

   db:
    image: mysql
    container_name: pmysqldb
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    volumes:
      - ${PWD}/pdata/data:/docker-entrypoint-initdb.d
    environment:
      MYSQL_ROOT_PASSWORD: example
      MYSQL_DATABASE: ecommerce

   adminer:
    image: adminer
    restart: always
    ports:
      - 8080:8080

   logstash:
       image: docker.elastic.co/logstash/logstash:7.1.1
       links:
       - elasticsearch
       volumes:
       - ${PWD}/ls_config:/usr/share/logstash/config/
       command: bin/logstash-plugin install logstash-input-jdbc
       command: logstash -f /usr/share/logstash/config/logstash.conf
       depends_on:
       - elasticsearch

volumes:
  elasticsearch:

我还有logstash.yml和logstash.conf文件来配置我的logstash 插件。

Logstash.conf

input {
  jdbc {
    jdbc_driver_library => "./mysql-connector-java-5.1.36-bin.jar"
    jdbc_driver_class => "com.mysql.jdbc.Driver"
    jdbc_connection_string => "jdbc:mysql://localhost:3306/ecommerce"
    jdbc_user => "root"
    jdbc_password => "exmaple"
    schedule => "* * * * *"
    statement => "SELECT * from ecommerce.table;"
  }
}
output {
   elasticsearch {
        hosts => ["elasticsearch:9200"]
        user => elastic
        password => changeme
   }
}

Logstash.yml

---
http.host: '0.0.0.0'
xpack.monitoring.elasticsearch.hosts: [ "elasticsearch:9200"]
xpack.monitoring.elasticsearch.username: elastic
xpack.monitoring.elasticsearch.password: changeme
xpack.monitoring.enabled: true

因此，当我运行时，docker-compose up我的所有容器都在运行，包括logstash，但是当logstash尝试运行conf文件时，它似乎无法加载驱动程序并返回错误，如下所示：

logstash_1       |   2056     LogStash::ConfigurationError
logstash_1       |   2056     com.mysql.jdbc.Driver not loaded. Are you sure you've included the correct jdbc driver in :jdbc_driver_library?
logstash_1       |   2056       /usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-input-jdbc-4.3.13/lib/logstash/plugin_mixins/jdbc/jdbc.rb:163:in `open_jdbc_connection'

由于我对 docker 和logstash 都是新手，我做错了什么吗？以及如何解决这个错误。

Answer 1

所以我发布此内容以防有人遇到与我相同的问题。我找到了解决方案：所以首先是使用MariaDB而不是MySQL，似乎MySQL和logstash有很多bug。我还创建了一个用户，而不是以 root 身份连接（这将意味着对文件的更改logstash.conf）docker-compose.yml，我的目标MariaDB如下

   db:
    image: mariadb # mysql
    container_name: ph_mariadb
    restart: always
    volumes:
      - ${PWD}/ph_datalake/data/shopware:/docker-entrypoint-initdb.d
    environment:
      MYSQL_USER: "toto"
      MYSQL_PASSWORD: "123456"
      MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
      MYSQL_DATABASE: ecommerce

   adminer:
    image: adminer
    restart: always
    ports:
      - 8080:8080

接下来，将jar包含类的文件com.mysql.jdbc.Driver直接复制到我的容器中 jar 所在的位置。docker-compose.yml我在logstash目标中的文件上使用卷目标来做到这一点，所以它变成：

   logstash:
       image: docker.elastic.co/logstash/logstash:7.1.1
       links:
       - elasticsearch
       - db
       volumes:
       - ${PWD}/ls_config/logstash.conf:/usr/share/logstash/config/logstash.conf
       - ${PWD}/ls_config/logstash.yml:/usr/share/logstash/config/logstash.yml
       - ${PWD}/ls_config/mariadb-java-client-2.4.3.jar:/usr/share/logstash/logstash-core/lib/jars/mariadb-java-client-2.4.3.jar 
       command: bin/logstash-plugin install logstash-input-jdbc
       command: logstash -f /usr/share/logstash/config/logstash.conf
       depends_on:
       - elasticsearch
       - db

我的logstash.conf文件也会改变：

• jdbc_driver_library => "./mysql-connector-java-5.1.36-bin.jar"从配置文件中删除。

• 将用户和密码修改为与MariaDB实例上的用户和密码相同。

所以它看起来像这样：

input {
  jdbc {
    jdbc_driver_class => 'org.mariadb.jdbc.Driver'
    jdbc_connection_string => 'jdbc:mariadb://db:3306/ecommerce'
    jdbc_user => 'toto'
    jdbc_password => '123456'
    schedule => "* * * * *"
    statement => 'SELECT * from ecommerce.table;'
  }
}
output {
   elasticsearch {
        hosts => ["elasticsearch:9200"]
        user => elastic
        password => changeme
        index => "logstash"
   }
}

到目前为止，我的logstash 设法找到该类并启动一个Driver 实例进行连接，但它没有连接。由于某种原因，连接将地址解释jdbc:mariadb://db:3306/ecommerce为我的logstash的本地主机，这意味着当logstash尝试连接时，toto它会尝试连接到它自己的IP地址。

因此，解决方案是仅启动Logstash，并且由于它依赖于它连接的数据库（MariaDB）和elasticsearch $ docker-compose up logstash

logstash_1       | [2019-08-16T11:22:12,572][INFO ][logstash.inputs.jdbc     ] (3.050417s) SELECT * from ecommerce.table;
logstash_1       | [2019-08-16T11:23:53,329][INFO ][logstash.inputs.jdbc     ] (3.014069s) SELECT * from ecommerce.table;
logstash_1       | [2019-08-16T11:25:35,980][INFO ][logstash.inputs.jdbc     ] (4.357945s) SELECT * from ecommerce.table;
logstash_1       | [2019-08-16T11:27:11,420][INFO ][logstash.inputs.jdbc     ] (3.188877s) SELECT * from ecommerce.table;
logstash_1       | [2019-08-16T11:28:50,292][INFO ][logstash.inputs.jdbc     ] (3.456620s) SELECT * from ecommerce.table;