Logstash无法连接到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：

泊坞窗，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docker docker-compose up时，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，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'

既然我是docker和logstash的新手，那么我有什么问题吗？ 以及如何解决这个错误。

Answer 1

所以我发布这个以防有人和我有同样的问题。 我找到了解决方案：首先是使用MariaDB而不是MySQL ，似乎MySQL和logstash存在很多错误。 我还创建了一个用户，而不是以root用户身份连接（这意味着对logstash.conf文件进行了更改）我的MariaDB docker-compose.yml目标如下所示

   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，将包含com.mysql.jdbc.Driver类的jar文件直接复制到我的容器中的jar所在的位置。 我使用logstash目标中的docker docker-compose.yml文件上的卷目标执行此操作，因此它变为：

   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文件也将改变：

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

• 将用户和密码更改为与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设法找到了类并启动了一个要连接的Driver实例，但它没有连接。 由于某种原因，连接是将地址jdbc:mariadb://db:3306/ecommerce ecommerce解释为我的logstash的本地主机，这意味着当logstash尝试与toto连接时，它会尝试连接到自己的IP地址。

所以解决这个问题的方法是只启动Logstash，因为它依赖于db（MariaDB）和$ docker-compose up logstash它连接了$ 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;