ELFK日志平台入门5---Logstash+Filebeat集群搭建

这个章节我们介绍下logstash+filebeat集群搭建。

1、环境准备

资源规划：

2、Logstash集群部署

下面操作均在三台机器操作：

解压Logstash安装包：

# tar zxf logstash-6.7.1.tar.gz && mv logstash-6.7.1/ /usr/local/logstash

# mkdir /usr/local/logstash/conf.d

修改Logstash配置：

# vim /usr/local/logstash/config/logstash.yml

http.host: "192.168.0.0"                    #填本机ip
http.port: 9600

配置Logstash服务：

新增服务配置文件：

# vim /etc/default/logstash

LS_HOME="/usr/local/logstash"
LS_SETTINGS_DIR="/usr/local/logstash"
LS_PIDFILE="/usr/local/logstash/run/logstash.pid"
LS_USER="elk"
LS_GROUP="elk"
LS_GC_LOG_FILE="/usr/local/logstash/logs/gc.log"
LS_OPEN_FILES="16384"
LS_NICE="19"
SERVICE_NAME="logstash"
SERVICE_DESCRIPTION="logstash"

新增服务文件：

# vim /etc/systemd/system/logstash.service

[Unit]
Description=logstash

[Service]
Type=simple
User=elk
Group=elk
# Load env vars from /etc/default/ and /etc/sysconfig/ if they exist.
# Prefixing the path with '-' makes it try to load, but if the file doesn't
# exist, it continues onward.
EnvironmentFile=-/etc/default/logstash
EnvironmentFile=-/etc/sysconfig/logstash
ExecStart=/usr/local/logstash/bin/logstash "--path.settings" "/usr/local/logstash/config" "--path.config" "/usr/local/logstash/conf.d"
Restart=always
WorkingDirectory=/
Nice=19
LimitNOFILE=16384

[Install]
WantedBy=multi-user.target

管理服务：

# mkdir /usr/local/logstash/{run,logs} && touch /usr/local/logstash/run/logstash.pid

# touch /usr/local/logstash/logs/gc.log && chown -R elk:elk /usr/local/logstash

# systemctl daemon-reload

# systemctl enable logstash

3、Filebeat部署

解压Filebeat安装包：

# tar zxf filebeat-6.2.4-linux-x86_64.tar.gz && mv filebeat-6.2.4-linux-x86_64 /usr/local/filebeat

配置filebeat服务：

新增服务配置文件：

# vim /usr/lib/systemd/system/filebeat.service

[Unit]
Description=Filebeat sends log files to Logstash or directly to Elasticsearch.
Documentation=https://www.elastic.co/products/beats/filebeat
Wants=network-online.target
After=network-online.target

[Service]
ExecStart=/usr/local/filebeat/filebeat -c /usr/local/filebeat/filebeat.yml -path.home /usr/local/filebeat -path.config /usr/local/filebeat -path.data /usr/local/filebeat/data -path.logs /usr/local/filebeat/logs
Restart=always

[Install]
WantedBy=multi-user.target

管理服务：

# mkdir /usr/local/filebeat/{data,logs}

# systemctl daemon-reload

# systemctl enable filebeat

3、与Kafka结合

这里以收集/app/log/app.log目录下日志为例：

配置filebeat：

# vim /usr/local/filebeat/filebeat.yml

filebeat.inputs:
- type: log
  enabled: true
  paths:
    - /app/log/app.log                 #日志路径
  fields:
    log_topics: app-service-log
  
output.kafka:
  enabled: true
  hosts: ["192.168.0.0:9092","192.168.0.1:9092","192.168.0.2:9092"]
  topic: '%{[fields][log_topics]}'

Kafka集群创建topic：

# /usr/local/kafka/bin/kafka-topics.sh --create --zookeeper 192.168.0.0:2181 --replication-factor 3 --partitions 1 --topic app-service-log

Created topic app-service-log.

配置Logstash:

# vim /usr/local/logstash/conf.d/messages.conf

input {
    kafka {
        bootstrap_servers => "192.168.0.0:9092,192.168.0.1:9092,192.168.0.2:9092"
        group_id => "app-service"     #默认为logstash
        topics => "app-service-log"
        auto_offset_reset => "latest"               #从最新的偏移量开始消费
        consumer_threads => 5               #消费的线程数
        decorate_events => true                #在输出消息的时候回输出自身的信息，包括：消费消息的大小、topic来源以及consumer的group信息
        type => "app-service"
    }
}

output {
    elasticsearch {
        hosts => ["192.168.0.0:9200","192.168.0.1:9200","192.168.0.2:9200"]
        index => "sys_messages.log-%{+YYYY.MM.dd}"
    }
}

安装logstash-input-kafka插件：

# chown -R elk:elk /usr/local/logstash

# /usr/local/logstash/bin/logstash-plugin install logstash-input-kafka

启动相关服务：

# systemctl start filebeat                  #启动filebeat

# systemctl start logstash                  #启动kafka

浏览器访问Kibana，新增索引查询：

4、Elasticsearch数据定时清理

由于生产环境日志量较大，长期存放Elasticsearch，会导致磁盘空间爆满风险，那如何保留近两天的日志呢？

这边要采用crontab来支持，Linux crontab是用来定期执行程序的命令。

创建sh可执行文件：

# vi /user/local/elasticsearch/es-index-clear.sh

#!/bin/bash
LAST_DATA=`date -d "-2 days" "+%Y.%m.%d"`                  #两天前的时间
curl -XDELETE http://192.168.0.0:9200/*-${LAST_DATA}       #删除es两天前数据

# chmod 777 es-index-clear.sh

配置执行时间、文件路径：

# crontab -e

10 00 * * * /usr/local/elasticsearch/es-index-clear.sh  #每天00点10分执行

重启crontab服务：

# service crond restart

至此ELFK+Kafka集群已经搭建完成，开始体验日志分析平台带来的快捷。

斑马工

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