Logstash requires Java 8. Java 9 is not supported.
1、检测是否安装了java环境
[root@node3 ~]# java -version java version "1.8.0_144" Java(TM) SE Runtime Environment (build 1.8.0_144-b01) Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
2、安装logstash，这里采用rpm安装
https://artifacts.elastic.co/downloads/logstash/logstash-5.6.1.rpm
yum install logstash
查看生成了哪些文件，查看logstash的执行文件位置：
/etc/logstash/conf.d /etc/logstash/jvm.options /etc/logstash/log4j2.properties /etc/logstash/logstash.yml /etc/logstash/startup.options /usr/share/logstash/CHANGELOG.md /usr/share/logstash/CONTRIBUTORS /usr/share/logstash/Gemfile /usr/share/logstash/Gemfile.jruby-1.9.lock /usr/share/logstash/LICENSE /usr/share/logstash/NOTICE.TXT /usr/share/logstash/bin/cpdump /usr/share/logstash/bin/ingest-convert.sh /usr/share/logstash/bin/logstash /usr/share/logstash/bin/logstash-plugin /usr/share/logstash/bin/logstash-plugin.bat /usr/share/logstash/bin/logstash.bat /usr/share/logstash/bin/logstash.lib.sh /usr/share/logstash/bin/ruby /usr/share/logstash/bin/setup.bat /usr/share/logstash/bin/system-install /usr/share/logstash/data
配置文件：
1、配置jvm
/etc/logstash/jvm.options
2、logstash的一些配置
/etc/logstash/logstash.yml
3、环境变量一些的配置
/etc/logstash/startup.options
4、日志与log4j2的配置
/etc/logstash/log4j2.properties
开始第一个任务：
[root@node3 conf.d]# /usr/share/logstash/bin/logstash -e 'input { stdin {} } output { stdout {} }'
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
提示warning，解决办法：
mkdir -p /usr/share/logstash/config/
ln -s /etc/logstash/* /usr/share/logstash/config
chown -R logstash:logstash /usr/share/logstash/config/
bin/logstash -e 'input { stdin { } } output { stdout {} }'
如果logstash不适用命令行执行，而是作为一个服务：
logstash启动：
/etc/init.d/logstash start
systemctl start logstash.service
开始编写配置文件进行logstash解析：
1、input插件中file插件的使用
[root@node3 conf.d]# cat file.conf
input {
file {
path => ["/var/log/messages"]
start_position => "beginning"
}
}
output {
stdout {
codec => rubydebug
}
}
[root@node3 conf.d]# /usr/share/logstash/bin/logstash -f file.conf
2、多个log日志的输入、
[root@node3 conf.d]# cat file_more_choose.conf
input {
file {
path => ["/var/log/messages"]
start_position => "beginning"
}
file {
path => ["/var/log/elasticsearch/my-elastic.log"]
start_position => "beginning"
}
}
output {
stdout {
codec => rubydebug
}
}
[root@node3 conf.d]# /usr/share/logstash/bin/logstash -f file_more_choose.conf
但是发现只打印出elastic的日志，message的日志没有stdout，收集的日志是增量的，之前收集的日志已经存在sincedb中了，所以会默认从之后开始存
Path of the sincedb database file (keeps track of the current position of monitored log files) that will be written to disk. The default will write sincedb files to <path.data>/plugins/inputs/file NOTE: it must be a file path and not a directory path，这是一段sincedb_path的解释
检查配置文件的语法是否正确：
-t, --config.test_and_exit Check configuration for valid syntax and then exit.
(default: false)
-r, --config.reload.automatic Monitor configuration changes and reload
whenever it is changed.
NOTE: use SIGHUP to manually reload the config
(default: false)
[root@node3 conf.d]# /usr/share/logstash/bin/logstash -f file.conf -t
Sending Logstash's logs to /var/log/logstash which is now configured via log4j2.properties
Configuration OK
3、以elasticsearch插件输出：
input {
file {
path => ["/var/log/logstash/logstash-plain.log"]
start_position => "beginning"
type => "logstash"
}
}
output {
elasticsearch {
hosts => ["192.168.44.134:9200"]
index => "logstash-log"
codec => rubydebug
}
}
4、根据插件type来定义输出插件：
[root@node3 conf.d]# cat type.conf
input {
file {
path => ["/var/log/logstash/logstash-plain.log"]
start_position => "beginning"
type => "logstash_2"
}
file {
path => ["/var/log/messages"]
start_position => "beginning"
type => "system"
}
}
output {
if [type] == "logstash_2" {
elasticsearch {
hosts => ["192.168.44.134:9200"]
index => "logstash_2"
codec => rubydebug
}
}
if [type] == "system" {
stdout {
codec => rubydebug
}
}
}
现在向messages日志中echo一段话：
echo "`date +%F`" >> /var/log/messages
然后开始执行：
[root@node3 conf.d]# /usr/share/logstash/bin/logstash -f type.conf
Sending Logstash's logs to /var/log/logstash which is now configured via log4j2.properties
{
"@version" => "1",
"host" => "node3",
"path" => "/var/log/messages",
"@timestamp" => 2017-09-20T08:19:05.782Z,
"message" => "2017-09-20", 这是刚刚echo新增的内容
"type" => "system"
}
查看es中的索引是否有生成：
