ELK实战之java日志收集
1、Java日志收集使用codec的multiline插件实现多行匹配，这是一个可以将多行进行合并的插件，而且可以使用what指定将匹配到的行与前面的行合并还是和后面的行合并。
https://www.elastic.co/guide/en/logstash/6.0/plugins-codecs-multiline.html
语法例子：
input {
stdin {
codec => multiline { #使用multiline插件
pattern => "pattern, a regexp" #正则匹配
negate => "true" or "false" #匹配是否成功
what => "previous" or "next" #和上面的还是和下面的内容合并
}
}
}
命令行测试输入输出
# /usr/share/logstash/bin/logstash -e 'input { stdin {codec => multiline { pattern => "^\[" negate => "true" what => "previous"} }} output { stdout {codec => rubydebug}}'
OpenJDK 64-Bit Server VM warning: If the number of processors is expected to increase from one, then you should configure the number of parallel GC threads appropriately using -XX:ParallelGCThreads=N
WARNING: Could not find logstash.yml which is typically located in $LS_HOME/config or /etc/logstash. You can specify the path using --path.settings. Continuing using the defaults
Could not find log4j2 configuration at path /usr/share/logstash/config/log4j2.properties. Using default config which logs errors to the console
The stdin plugin is now waiting for input:
111111111
22222222222
333333333
[5555555555
{
"@version" => "1",
"host" => "linux-node1",
"@timestamp" => 2017-12-28T03:06:11.663Z,
"message" => "111111111\n22222222222\n333333333", #会将[开头前面的进行合并
"tags" => [
"multiline"
]
}
666666666666666666
77777777777777777
8888888888
[999999999
{
"@version" => "1",
"host" => "linux-node1",
"@timestamp" => 2017-12-28T03:06:37.326Z,
"message" => "[5555555555\n666666666666666666\n77777777777777777\n8888888888",
"tags" => [
"multiline"
]
}
2、举例
（1）查看elk集群日志
elk集群日志上都是以"["开头并且每一个信息都是如此，寻找规律
# tailf /data/logs/elk-cluster.log
zen-disco-node-join[{elk-node2}{CcF5fl9sRqCAGYYpT3scuw}{ncgZ1UsPRq-iz6zWHPl7PQ}{192.168.56.12}{192.168.56.12:9300}], reason: added {{elk-node2}{CcF5fl9sRqCAGYYpT3scuw}{ncgZ1UsPRq-iz6zWHPl7PQ}{192.168.56.12}{192.168.56.12:9300},}
added {{elk-node2}{CcF5fl9sRqCAGYYpT3scuw}{ncgZ1UsPRq-iz6zWHPl7PQ}{192.168.56.12}{192.168.56.12:9300},}, reason: apply cluster state (from master source ]])
value for setting "discovery.zen.minimum_master_nodes" is too low. This can result in data loss! Please set it to at least a quorum of master-eligible nodes (current value: [-1], total number of master-eligible nodes used for publishing in this round: )
Cluster health status changed from to (reason: ] ...]).
creating index, cause , templates , shards /, mappings
create_mapping
Cluster health status changed from to (reason: ] ...]).
（2）配置logstash
# vim /etc/logstash/conf.d/java.conf
input {
file{
path => "/data/logs/elk-cluster.log"
type => "elasticsearch-java-log"
start_position => "beginning"
stat_interval => "2"
code => multiline {
pattern => "^\[" #以"["开头进行正则匹配
negate => "true"#正则匹配成功
what => "previous"#和前面的内容进行合并
}
}
}
output {
if == "elasticsearch-java-log" {
elasticsearch {
hosts => ["192.168.56.11:9200"]
index => "elasticsearch-jva-log-%{+YYYY.MM.dd}"
}
}
}
# /usr/share/logstash/bin/logstash -f /etc/logstash/conf.d/java.conf -t
OpenJDK 64-Bit Server VM warning: If the number of processors is expected to increase from one, then you should configure the number of parallel GC threads appropriately using -XX:ParallelGCThreads=N
WARNING: Could not find logstash.yml which is typically located in $LS_HOME/config or /etc/logstash. You can specify the path using --path.settings. Continuing using the defaults
Could not find log4j2 configuration at path /usr/share/logstash/config/log4j2.properties. Using default config which logs errors to the console
Configuration OK
# systemctl restart logstash
（3）elasticsearch的head插件查看
http://i2.运维网.com/images/blog/201712/28/75eebe060e1bd4691deef7493d877953.png
数据浏览：
http://i2.运维网.com/images/blog/201712/28/7ba778d29015bc2d8ceb4096d6b3351a.png
（4）添加到Kibana
http://i2.运维网.com/images/blog/201712/28/f5b80a53d4c282e689a63dfae37c7da8.png
可以看到以“[”开头的信息都合并了，如图：
http://i2.运维网.com/images/blog/201712/28/690661910d8652c90935a821491f1b4b.png
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