目录
1、使用codec的multiline插件收集java日志... 1
2、收集nginx日志... 2
3、收集系统syslog日志... 3
4、使用fliter的grok模块收集mysql日志... 4
1、使用codec的multiline插件收集java日志
对于采用ELK作为应用日志来说，多行消息的友好展示是必不可少的，否则ELK的价值就大大打折了。要正确的处理多行消息，需使用multiline插件
比如，对于java日志而言，可以使用：
multiline.pattern: '^\['
multiline.negate: true
multiline.match: after
这样，下面的日志就算一个事件了。
input {
file {
path => "/var/log/elasticsearch/chuck-clueser.log"
type => "es-error"
start_position => "beginning"
codec => multiline {
pattern => "^\[" #使用正则表式， 以中括号开头的就是一行日志
negate => true
what => "previous"
}
}
}
output {
if [type] == "es-error" {
elasticsearch {
hosts => ["192.168.100.163:9200"]
index => "es-error-%{+YYYY.MM.dd}"
}
}
}
2、收集nginx日志
使用codec的json插件将日志的域进行分段，使用key-value的方式，使日志格式更清晰，易于搜索，还可以降低cpu的负载
2.1 更改nginx的配置文件的日志格式，使用json
[root@linux-node1 ~]# vim /etc/nginx/nginx.conf #添加日志格式，把自带的格式注释掉
17 http {
18 #log_format main '$remote_addr - $remote_user [$time_local] "$request" '
19 # '$status $body_bytes_sent "$http_referer" '
20 # '"$http_user_agent" "$http_x_forwarded_for"';
21 #access_log /var/log/nginx/access.log main;
22 log_format json '{ "@timestamp": "$time_local", '
23 '"@fields": { '
24 '"remote_addr": "$remote_addr", '
25 '"remote_user": "$remote_user", '
26 '"body_bytes_sent": "$body_bytes_sent", '
27 '"request_time": "$request_time", '
28 '"status": "$status", '
29 '"request": "$request", '
30 '"request_method": "$request_method", '
31 '"http_referrer": "$http_referer", '
32 '"body_bytes_sent":"$body_bytes_sent", '
33 '"http_x_forwarded_for": "$http_x_forwarded_for", '
34 '"http_user_agent": "$http_user_agent" } }';
35 access_log /var/log/nginx/access_json.log json;
[root@linux-node1 ~]# nginx -t #检查配置文件
[root@linux-node1 ~]# systemctl start nginx
日志格式如下
2.2 使用logstash将nginx访问日志收集起来
[root@linux-node1 ~]# cat log_nginx.conf 4、
input {
file {
path => "/var/log/nginx/access_json.log"
codec => "json"
start_position => "beginning"
type => "nginx-log"
}
}
output {
elasticsearch {
hosts => ["http://192.168.100.163:9200"]
index => "nginx-%{+YYY.MM.dd}"
}
}
[root@linux-node1 ~]# /usr/local/logstash/bin/logstash -f log_nginx.conf
3、收集系统syslog日志
[root@linux-node1 ~]# vim syslog.conf
input {
syslog {
type => "system-syslog"
#绑定个ip，监听个514端口，启动后，别的机器可以通过网络把日志发过来
host => "192.168.100.161"
port => "514"
}
}
output {
elasticsearch {
hosts => ["192.168.100.161:9200"]
index => "system-syslog-%{+YYYY.MM.dd}"
}
}
[root@linux-node1 ~]# /usr/local/logstash/bin/logstash -f syslog.conf
修改服务器的syslog配置文件，把日志信息发送到514端口上
[root@linux-node2 ~]# vim /etc/rsyslog.conf
90 *.* @@192.168.100.161:514
[root@linux-node2 ~]# systemctl restart rsyslog
4、使用fliter的grok模块收集mysql日志
filter插件有很多，在这里就学习grok插件，使用正则匹配日志里的域来拆分。在实际生产中，apache日志不支持jason，就只能使用grok插件匹配；mysql慢查询日志也是无法拆分，只能使用grok正则表达式匹配拆分。
在如下链接，github上有很多写好的grok模板，可以直接引用
https://github.com/logstash-plugins/logstash-patterns-core/blob/master/patterns/grok-patterns
在装好的logstash中也会有grok匹配规则，直接可以引用，路径如下
[root@linux-node1 patterns]# pwd
/usr/local/logstash/vendor/bundle/jruby/1.9/gems/logstash-patterns-core-4.1.0/patterns
4.1日志文件
[root@linux-node1 ~]# cat slow.log
# Time: 160108 15:46:14
# User@Host: dev_select_user[dev_select_user] @ [192.168.97.86] Id: 714519
# Query_time: 1.638396 Lock_time: 0.000163 Rows_sent: 40 Rows_examined: 939155
SET timestamp=1452239174;
SELECT DATE(create_time) as day,HOUR(create_time) as h,round(avg(low_price),2) as low_price
FROM t_actual_ad_num_log WHERE create_time>='2016-01-07' and ad_num<=10
GROUP BY DATE(create_time),HOUR(create_time);
4.2编写slow.conf
[root@linux-node1 ~]# cat mysql-slow.conf
input{
file {
path => "/root/slow.log"
type => "mysql-slow-log"
start_position => "beginning"
codec => multiline {
pattern => "^# User@Host:"
negate => true
what => "previous"
}
}
}
filter {
# drop sleep events
grok {
match => { "message" =>"SELECT SLEEP" }
add_tag => [ "sleep_drop" ]
tag_on_failure => [] # prevent default _grokparsefailure tag on real records
}
if "sleep_drop" in [tags] {
drop {}
}
grok {
match => [ "message", "(?m)^# User@Host: %{USER:user}\[[^\]]+\] @ (?:(?
}
date {
match => [ "timestamp", "UNIX" ]
remove_field => [ "timestamp" ]
}
}
output {
stdout{
codec => "rubydebug"
}
}
执行该配置文件，查看grok正则匹配结果