ELK 记录 java log4j 类型日志
ELK 记载 java log4j 时，一个报错会生成很多行，阅读起来很不方便。
类似这样
解决这个问题的方法
1.使用多行合并
合并多行数据(Multiline)
有些时候，应用程序调试日志会包含非常丰富的内容，为一个事件打印出很多行内容。这种日志通常都很难通过命令行解析的方式做分析。
而 logstash 正为此准备好了 codec/multiline 插件！
小贴士：multiline 插件也可以用于其他类似的堆栈式信息，比如 linux 的内核日志。
配置文件
input {
file {
path => "/root/error.log"
codec => multiline {
pattern => "^\["
negate => true
what => "previous"
}
start_position => "beginning"
sincedb_path => "/dev/null"
ignore_older=>0
}
}
output {
elasticsearch { hosts => ["10.10.15.90:9200"]
index => "testjava"
}
stdout { codec => rubydebug }
}
以上配置文件，将 不是以 " [ " 这个符号开头的行并入上一个事件中。
测试文本error.log
[2018-06-05 17:23:57]ERROR com.alibaba.druid.pool.DruidAbstractDataSource(line:1134) -oracle.jdbc.driver.OracleDriver is deprecated. [2018-06-05 17:23:57]ERROR com.alibaba.druid.pool.DruidAbstractDataSource(line:1134) -oracle.jdbc.driver.OracleDriver is deprecated. [2018-06-05 17:23:59]ERROR com.alibaba.dubbo.container.Main(line:86) - [DUBBO] Error creating bean with name 'YSWPurchaseListService': Cannot resolve reference to bean 'ySWPurchaseListServiceImpl' while setting bean property 'ref'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'ySWPurchaseListServiceImpl' available, dubbo version: 2.5.3, current host: 127.0.0.1 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'YSWPurchaseListService': Cannot resolve reference to bean 'ySWPurchaseListServiceImpl' while setting bean property 'ref'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'ySWPurchaseListServiceImpl' available at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:378) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:110) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1613) Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'ySWPurchaseListServiceImpl' available at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:367) ... 17 more [2018-06-05 17:25:05]ERROR com.alibaba.druid.pool.DruidAbstractDataSource(line:1134) -oracle.jdbc.driver.OracleDriver is deprecated. [2018-06-05 17:26:05]ERROR com.alibaba.druid.pool.DruidAbstractDataSource(line:1134) -oracle.jdbc.driver.OracleDriver is deprecated.hello world [hello world 111111111111111hello world [222222222hello world [333333hello world
运行结果
{ "@timestamp" => 2018-08-29T02:02:56.340Z, "message" => "[2018-06-05 17:23:57]ERROR com.alibaba.druid.pool.DruidAbstractDataSource(line:1134) -oracle.jdbc.driver.OracleDriver is deprecated.", "path" => "/root/error.log", "host" => "localhost.localdomain", "@version" => "1" } { "@timestamp" => 2018-08-29T02:02:56.264Z, "message" => "[2018-06-05 17:23:57]ERROR com.alibaba.druid.pool.DruidAbstractDataSource(line:1134) -oracle.jdbc.driver.OracleDriver is deprecated.", "path" => "/root/error.log", "host" => "localhost.localdomain", "@version" => "1" } { "tags" => [ [0] "multiline" ], "host" => "localhost.localdomain", "@version" => "1", "@timestamp" => 2018-08-29T02:02:56.349Z, "message" => "[2018-06-05 17:23:59]ERROR com.alibaba.dubbo.container.Main(line:86) - [DUBBO] Error creating bean with name
'YSWPurchaseListService': Cannot resolve reference to bean 'ySWPurchaseListServiceImpl' while setting bean property 'ref'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'ySWPurchaseListServiceImpl' available, dubbo version: 2.5.3,
current host: 127.0.0.1\norg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'YSWPurchaseListService':
Cannot resolve reference to bean 'ySWPurchaseListServiceImpl' while setting bean property 'ref'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'ySWPurchaseListServiceImpl'
available\n\tat org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:378)\n\tat
org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:110)\n\tat org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1613)\nCaused by:
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'ySWPurchaseListServiceImpl' available\n\tat
org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:367)\n\t... 17 more", "path" => "/root/error.log" } { "@timestamp" => 2018-08-29T02:02:56.353Z, "message" => "[2018-06-05 17:25:05]ERROR com.alibaba.druid.pool.DruidAbstractDataSource(line:1134) -oracle.jdbc.driver.OracleDriver is deprecated.", "path" => "/root/error.log", "host" => "localhost.localdomain", "@version" => "1" } { "@timestamp" => 2018-08-29T02:02:56.353Z, "message" => "[2018-06-05 17:26:05]ERROR com.alibaba.druid.pool.DruidAbstractDataSource(line:1134) -oracle.jdbc.driver.OracleDriver is deprecated.hello world", "path" => "/root/error.log", "host" => "localhost.localdomain", "@version" => "1" } { "tags" => [ [0] "multiline" ], "host" => "localhost.localdomain", "@version" => "1", "@timestamp" => 2018-08-29T02:02:56.354Z, "message" => "[hello world\n111111111111111hello world", "path" => "/root/error.log" } { "@timestamp" => 2018-08-29T02:02:56.354Z, "message" => "[222222222hello world", "path" => "/root/error.log", "host" => "localhost.localdomain", "@version" => "1" } q^H^C[WARN ] 2018-08-29 10:13:19.902 [SIGINT handler] runner - SIGINT received. Shutting down. { "@timestamp" => 2018-08-29T02:13:20.848Z, "message" => "[333333hello world", "path" => "/root/error.log", "host" => "localhost.localdomain", "@version" => "1" }
测试结果：
测试文本中的语句，按照 "[" 这个符号，被分割成了 7 个事件（总共8个事件），最后一个事件没有显示是正常的
这是因为你最后输入的回车符 \n 并不匹配设定的 ^\[ 正则表达式，
logstash 还得等下一行数据直到匹配成功后才会输出这个事件。
解释
其实这个插件的原理很简单，就是把当前行的数据添加到前面一行后面，，直到新进的当前行匹配 ^\[ 正则为止。
这个正则还可以用 grok 表达式，稍后你就会学习这方面的内容。
2.使用插件input/log4j
logstash 还提供了另一种处理 log4j 的方式：input/log4j。
与 codec/multiline 不同，这个插件是直接调用了 org.apache.log4j.spi.LoggingEvent 处理 TCP 端口接收的数据。
