logstash pipeline 包含两个必须的元素：input和output，和一个可选元素：filter。
从input读取事件源，（经过filter解析和处理之后），从output输出到目标存储库（elasticsearch或其他）。
在生产环境使用logstash，一般使用都将配置写入文件里面，然后启动logstash。
具体参照官网：https://www.elastic.co/guide/en/logstash/7.1/index.html
处理nginx日志
# vim nginx_access.conf
input{
file{
path => "/var/log/nginx/access.log"
start_position => "beginning"
type => "nginx_access_log"
}
}
filter{
grok{
match => {"message" => "%{IPORHOST:clientip} %{USER:ident} %{USER:auth} \[%{HTTPDATE:timestamp}\] \"%{WORD:verb} %{DATA:request} HTTP/%{NUMBER:httpversion}\" %{NUMBER:response:int} (?:-|%{NUMBER:bytes:int}) \"(?:-|%{DATA:referrer})\" \"%{DATA:user_agent}\" (?:%{IP:proxy}|-) %{DATA:upstream_addr} %{NUMBER:upstream_request_time:float} %{NUMBER:upstream_response_time:float}"}
match => {"message" => "%{IPORHOST:clientip} %{USER:ident} %{USER:auth} \[%{HTTPDATE:timestamp}\] \"%{WORD:verb} %{DATA:request} HTTP/%{NUMBER:httpversion}\" %{NUMBER:response:int} (?:-|%{NUMBER:bytes:int}) \"%{DATA:referrer}\" \"%{DATA:user_agent}\" \"%{DATA:proxy}\""}
}
if [request] {
urldecode {
field => "request"
}
ruby {
init => "@kname = ['url_path','url_arg']"
code => "
new_event = LogStash::Event.new(Hash[@kname.zip(event.get('request').split('?'))])
event.append(new_event)"
}
if [url_arg] {
ruby {
init => "@kname = ['key', 'value']"
code => "event.set('url_args', event.get('url_arg').split('&').collect {|i| Hash[@kname.zip(i.split('='))]})"
}
}
}
geoip{
source => "clientip"
}
useragent{
source => "user_agent"
target => "ua"
remove_field => "user_agent"
}
date {
match => ["timestamp","dd/MMM/YYYY:HH:mm:ss Z"]
locale => "en"
}
mutate{
remove_field => ["message","timestamp","request","url_arg"]
}
}
output{
elasticsearch {
hosts => "localhost:9200"
index => "nginx-access-log-%{+YYYY.MM.dd}"
}
# stdout {
# codec => rubydebug
# }
}
如果是想测试配置文件写的是否正确，用下面这个方式启动测试一下
/usr/share/logstash/bin/logstash -t -f /etc/logstash/conf.d/nginx.conf #测试配置文件 Configuration OK /usr/share/logstash/bin/logstash -f /etc/logstash/conf.d/nginx_access.conf #启动logstash
启动logstash
# systemctl start logstash
input plugin 让logstash可以读取特定的事件源。
官网：https://www.elastic.co/guide/en/logstash/current/input-plugins.html
事件源可以是从stdin屏幕输入读取，可以从file指定的文件，也可以从es，filebeat，kafka，redis等读取
stdin 标准输入
file 从文件读取数据
file{ path => ['/var/log/nginx/access.log'] #要输入的文件路径 type => 'nginx_access_log' start_position => "beginning" } # path 可以用/var/log/*.log,/var/log/**/*.log，如果是/var/log则是/var/log/*.log # type 通用选项. 用于激活过滤器 # start_position 选择logstash开始读取文件的位置，begining或者end。 还有一些常用的例如：discover_interval，exclude，sincedb_path,sincedb_write_interval等可以参考官网syslog 通过网络将系统日志消息读取为事件
syslog{ port =>"514" type => "syslog" } # port 指定监听端口(同时建立TCP/UDP的514端口的监听) #从syslogs读取需要实现配置rsyslog： # cat /etc/rsyslog.conf 加入一行 *.* @172.17.128.200:514 #指定日志输入到这个端口，然后logstash监听这个端口，如果有新日志输入则读取 # service rsyslog restart #重启日志服务beats 从Elastic beats接收事件
beats { port => 5044 #要监听的端口 } # 还有host等选项 # 从beat读取需要先配置beat端，从beat输出到logstash。 # vim /etc/filebeat/filebeat.yml .......... output.logstash: hosts: ["localhost:5044"]kafka 将 kafka topic 中的数据读取为事件
kafka{ bootstrap_servers=> "kafka01:9092,kafka02:9092,kafka03:9092" topics => ["access_log"] group_id => "logstash-file" codec => "json" }kafka{ bootstrap_servers=> "kafka01:9092,kafka02:9092,kafka03:9092" topics => ["weixin_log","user_log"] codec => "json" }# bootstrap_servers 用于建立群集初始连接的Kafka实例的URL列表。 # topics 要订阅的主题列表，kafka topics # group_id 消费者所属组的标识符，默认为logstash。kafka中一个主题的消息将通过相同的方式分发到Logstash的group_id # codec 通用选项，用于输入数据的编解码器。
还有很多的input插件类型，可以参考官方文档来配置。
filter plugin 过滤器插件，对事件执行中间处理
grok 解析文本并构造 。把非结构化日志数据通过正则解析成结构化和可查询化
grok { match => {"message"=>"^%{IPORHOST:clientip} %{USER:ident} %{USER:auth} \[%{HTTPDATE:timestamp}\] "%{WORD:verb} %{DATA:request} HTTP/%{NUMBER:httpversion}" %{NUMBER:response:int} (?:-|%{NUMBER:bytes:int}) %{QS:referrer} %{QS:agent}$"} } 匹配nginx日志 # 203.202.254.16 - - [22/Jun/2018:16:12:54 +0800] "GET / HTTP/1.1" 200 3700 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/601.7.7 (KHTML, like Gecko) Version/9.1.2 Safari/601.7.7" #220.181.18.96 - - [13/Jun/2015:21:14:28 +0000] "GET /blog/geekery/xvfb-firefox.html HTTP/1.1" 200 10975 "-" "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"注意这里grok 可以有多个match匹配规则，如果前面的匹配失败可以使用后面的继续匹配。例如
grok { match => ["message", "%{IP:clientip} - %{USER:user} \[%{HTTPDATE:raw_datetime}\] \"(?:%{WORD:verb} %{URIPATHPARAM:request} HTTP/%{NUMBER:httpversion})\" (?:\"%{DATA:body}\" )?(?:\"%{DATA:cookie}\" )?%{NUMBER:response} (?:%{NUMBER:bytes:int}|-) \"%{DATA:referrer}\" \"%{DATA:agent}\" (?:(%{IP:proxy},? ?)*|-|unknown) (?:%{DATA:upstream_addr} |)%{NUMBER:request_time:float} (?:%{NUMBER:upstream_time:float}|-)"] match => ["message", "%{IP:clientip} - %{USER:user} \[%{HTTPDATE:raw_datetime}\] \"(?:%{WORD:verb} %{URI:request} HTTP/%{NUMBER:httpversion})\" (?:\"%{DATA:body}\" )?(?:\"%{DATA:cookie}\" )?%{NUMBER:response} (?:%{NUMBER:bytes:int}|-) \"%{DATA:referrer}\" \"%{DATA:agent}\" (?:(%{IP:proxy},? ?)*|-|unknown) (?:%{DATA:upstream_addr} |)%{NUMBER:request_time:float} (?:%{NUMBER:upstream_time:float}|-)"] }
grok 语法：%{SYNTAX:SEMANTIC} 即 %{正则:自定义字段名}
官方提供了很多正则的grok pattern可以直接使用 :https://github.com/logstash-plugins/logstash-patterns-core/blob/master/patterns
grok debug工具： http://grokdebug.herokuapp.com
正则表达式调试工具： https://www.debuggex.com/
需要用到较多的正则知识，参考文档有：https://www.jb51.net/tools/zhengze.html
自定义模式： (?<字段名>the pattern)
例如： 匹配 2018/06/27 14:00:54
(?<datetime>\d\d\d\d\/\d\d\/\d\d \d\d:\d\d:\d\d)
得到结果： "datetime": "2018/06/27 14:00:54"
date 日期解析 解析字段中的日期，然后转存到@timestamp
[2018-07-04 17:43:35,503] grok{ match => {"message"=>"%{DATA:raw_datetime}"} } date{ match => ["raw_datetime","YYYY-MM-dd HH:mm:ss,SSS"] remove_field =>["raw_datetime"] } #将raw_datetime存到@timestamp 然后删除raw_datetime #24/Jul/2018:18:15:05 +0800 date { match => ["timestamp","dd/MMM/YYYY:HH:mm:ss Z] }mutate 对字段做处理 重命名、删除、替换和修改字段。
covert 类型转换。类型包括：integer，float，integer_eu，float_eu，string和boolean
filter{ mutate{ # covert => ["response","integer","bytes","float"] #数组的类型转换 convert => {"message"=>"integer"} } } #测试-------> { "host" => "localhost", "message" => 123, #没带“”,int类型 "@timestamp" => 2018-06-26T02:51:08.651Z, "@version" => "1" }split 使用分隔符把字符串分割成数组
mutate{ split => {"message"=>","} } #----------> aaa,bbb { "@timestamp" => 2018-06-26T02:40:19.678Z, "@version" => "1", "host" => "localhost", "message" => [ [0] "aaa", [1] "bbb" ]} 192,128,1,100 { "host" => "localhost", "message" => [ [0] "192", [1] "128", [2] "1", [3] "100" ], "@timestamp" => 2018-06-26T02:45:17.877Z, "@version" => "1" }merge 合并字段 。数组和字符串 ，字符串和字符串
filter{ mutate{ add_field => {"field1"=>"value1"} } mutate{ split => {"message"=>"."} #把message字段按照.分割 } mutate{ merge => {"message"=>"field1"} #将filed1字段加入到message字段 } } #---------------> abc { "message" => [ [0] "abc," [1] "value1" ], "@timestamp" => 2018-06-26T03:38:57.114Z, "field1" => "value1", "@version" => "1", "host" => "localhost" } abc,.123 { "message" => [ [0] "abc,", [1] "123", [2] "value1" ], "@timestamp" => 2018-06-26T03:38:57.114Z, "field1" => "value1", "@version" => "1", "host" => "localhost" }rename 对字段重命名
filter{ mutate{ rename => {"message"=>"info"} } } #--------> 123 { "@timestamp" => 2018-06-26T02:56:00.189Z, "info" => "123", "@version" => "1", "host" => "localhost" }remove_field 移除字段
mutate { remove_field => ["message","datetime"] }join 用分隔符连接数组，如果不是数组则不做处理
mutate{ split => {"message"=>":"} } mutate{ join => {"message"=>","} } ------> abc:123 { "@timestamp" => 2018-06-26T03:55:41.426Z, "message" => "abc,123", "host" => "localhost", "@version" => "1" } aa:cc { "@timestamp" => 2018-06-26T03:55:47.501Z, "message" => "aa,cc", "host" => "localhost", "@version" => "1" }gsub 用正则或者字符串替换字段值。仅对字符串有效
mutate{ gsub => ["message","/","_"] #用_替换/ } ------> a/b/c/ { "@version" => "1", "message" => "a_b_c_", "host" => "localhost", "@timestamp" => 2018-06-26T06:20:10.811Z }update 更新字段。如果字段不存在，则不做处理
mutate{ add_field => {"field1"=>"value1"} } mutate{ update => {"field1"=>"v1"} update => {"field2"=>"v2"} #field2不存在 不做处理 } ----------------> { "@timestamp" => 2018-06-26T06:26:28.870Z, "field1" => "v1", "host" => "localhost", "@version" => "1", "message" => "a" }replace 更新字段。如果字段不存在，则创建
mutate{ add_field => {"field1"=>"value1"} } mutate{ replace => {"field1"=>"v1"} replace => {"field2"=>"v2"} } ----------------------> { "message" => "1", "host" => "localhost", "@timestamp" => 2018-06-26T06:28:09.915Z, "field2" => "v2", #field2不存在，则新建 "@version" => "1", "field1" => "v1" }geoip 根据来自Maxmind GeoLite2数据库的数据添加有关IP地址的地理位置的信息
geoip { source => "clientip" database =>"/tmp/GeoLiteCity.dat" }ruby ruby插件可以执行任意Ruby代码
filter{ urldecode{ field => "message" } ruby { init => "@kname = ['url_path','url_arg']" code => " new_event = LogStash::Event.new(Hash[@kname.zip(event.get('message').split('?'))]) event.append(new_event)" } if [url_arg]{ kv{ source => "url_arg" field_split => "&" target => "url_args" remove_field => ["url_arg","message"] } } } # ruby插件 # 以？为分隔符，将request字段分成url_path和url_arg --------------------> www.test.com?test { "url_arg" => "test", "host" => "localhost", "url_path" => "www.test.com", "message" => "www.test.com?test", "@version" => "1", "@timestamp" => 2018-06-26T07:31:04.887Z } www.test.com?title=elk&content=学习elk { "url_args" => { "title" => "elk", "content" => "学习elk" }, "host" => "localhost", "url_path" => "www.test.com", "@version" => "1", "@timestamp" => 2018-06-26T07:33:54.507Z }urldecode 用于解码被编码的字段,可以解决URL中 中文乱码的问题
urldecode{ field => "message" } # field :指定urldecode过滤器要转码的字段,默认值是"message" # charset(缺省): 指定过滤器使用的编码.默认UTF-8kv 通过指定分隔符将字符串分割成key/value
kv{ prefix => "url_" #给分割后的key加前缀 target => "url_ags" #将分割后的key-value放入指定字段 source => "message" #要分割的字段 field_split => "&" #指定分隔符 remove_field => "message" } --------------------------> a=1&b=2&c=3 { "host" => "localhost", "url_ags" => { "url_c" => "3", "url_a" => "1", "url_b" => "2" }, "@version" => "1", "@timestamp" => 2018-06-26T07:07:24.557Zuseragent 添加有关用户代理(如系列,操作系统,版本和设备)的信息
if [agent] != "-" { useragent { source => "agent" target => "ua" remove_field => "agent" } } # if语句，只有在agent字段不为空时才会使用该插件 #source 为必填设置,目标字段 #target 将useragent信息配置到ua字段中。如果不指定将存储在根目录中
logstash 比较运算符
等于: ==, !=, <, >, <=, >=
正则: =~, !~ (checks a pattern on the right against a string value on the left)
包含关系: in, not in
支持的布尔运算符：and, or, nand, xor
支持的一元运算符: !
output plugin 输出插件，将事件发送到特定目标。
stdout 标准输出。将事件输出到屏幕上
output{ stdout{ codec => "rubydebug" } }file 将事件写入文件
file { path => "/data/logstash/%{host}/{application} codec => line { format => "%{message}"} } }kafka 将事件发送到kafka
kafka{ bootstrap_servers => "localhost:9092" topic_id => "test_topic" #必需的设置。生成消息的主题 }elasticseach 在es中存储日志
elasticsearch { hosts => "localhost:9200" index => "nginx-access-log-%{+YYYY.MM.dd}" } #index 事件写入的索引。可以按照日志来创建索引，以便于删旧数据和按时间来搜索日志
补充一个codec plugin 编解码器插件
codec 本质上是流过滤器，可以作为input 或output 插件的一部分运行。例如上面output的stdout插件里有用到。
multiline codec plugin 多行合并, 处理堆栈日志或者其他带有换行符日志需要用到
input { stdin { codec => multiline { pattern => "pattern, a regexp" #正则匹配规则，匹配到的内容按照下面两个参数处理 negate => "true" or "false" # 默认为false。处理匹配符合正则规则的行。如果为true，处理不匹配符合正则规则的行。 what => "previous" or "next" #指定上下文。将指定的行是合并到上一行或者下一行。 } } } codec => multiline { pattern => "^\s" what => "previous" } # 以空格开头的行都合并到上一行 codec => multiline { # Grok pattern names are valid! :) pattern => "^%{TIMESTAMP_ISO8601} " negate => true what => "previous" } # 任何不以这个时间戳格式开头的行都与上一行合并 codec => multiline { pattern => "\\$" what => "next" } # 以反斜杠结尾的行都与下一行合并
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