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07. ELK架构-ELKF+Kafka

部署ELKF+Kafka

基础部分

系统架构

主机规划

主机地址主机名称CPU/MEM主机用途192.168.23.141elk-node-014C/8Gjdk+zookeeper+kafkaElasticsearch+Filebeat+Nginx192.168.23.142elk-node-024C/8Gjdk+zookeeper+kafkaElasticsearch+Filebeat+Tomcat192.168.23.143elk-node-034C/8Gjdk+zookeeper+kafkaElasticsearch+Logstash+Kibana

基础配置

三节点都执行

  • 设置主机名称

三节点分别执行

#各个主机单独执行命令
hostnamectl set-hostname elk-node-01
hostnamectl set-hostname elk-node-02
hostnamectl set-hostname elk-node-03
  • 配置hosts
cat>> /etc/hosts <<EOF
#for zookeeper
192.168.23.141 elk-node-01
192.168.23.142 elk-node-02
192.168.23.143 elk-node-03
EOF
  • 关闭防火墙
#所有节点都要执行（可以选择关闭防火墙，也可以选择添加防火墙策略）
systemctl stop firewalld
systemctl disable firewalld
  • 关闭selinux
#所有节点都要执行
setenforce 0sed-i"s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
  • 关闭swap
swapoff -a&&sysctl-wvm.swappiness=0sed-ri'/^[^#]*swap/s@^@#@' /etc/fstab
  • 配置yum源
#所有节点都要执行wget-O /etc/yum.repos.d/Centos-7.repo http://mirrors.aliyun.com/repo/Centos-7.repo
wget-O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum clean all
yum makecache
  • 优化sshd服务
#所有节点都要执行sed-ri's/^#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config
sed-ri's/^GSSAPIAuthentication yes/GSSAPIAuthentication no/g' /etc/ssh/sshd_config
  • 集群时间同步
#所有节点都要执行
yum -yinstall ntpdate chrony
sed-ri's/^server/#server/g' /etc/chrony.conf
echo"server ntp.aliyun.com iburst">> /etc/chrony.conf
systemctl start chronyd
systemctl enable chronyd

#显示chronyd服务正在使用的NTP源服务器的详细状态
chronyc sourcestats -v
  • 调整限制
cat>> /etc/security/limits.conf <<EOF
#change for kafka
* soft nofile 65536
* hard nofile 131072
* soft nproc 65535
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited　
EOF
  • 调整限制-内存限制
sysctl-wvm.max_map_count=262144

Kafka部分

安装服务

三节点都安装

  1. jdk
  • 下载JDK

由于每次去oracle下载JDK都要登录密码，此次上传的JDK1.8版本

  • 解压JDK
tar-zxvf jdk-8u401-linux-x64.tar.gz -C /usr/local/
  • 环境变量
cat>> /etc/profile <<'EOF'
#for jdk
export HISTTIMEFORMAT="%F %T "
export JAVA_HOME=/usr/local/jdk1.8.0_401/
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
EOFsource /etc/profile
  • 查看版本
java-version
  1. zookeeper
  • 下载Zookeeper
wget https://archive.apache.org/dist/zookeeper/zookeeper-3.8.3/apache-zookeeper-3.8.3-bin.tar.gz
  • 解压Zookeeper
tar-zxvf apache-zookeeper-3.8.3-bin.tar.gz -C /usr/local/
  • 环境变量
cat>> /etc/profile <<'EOF'
#for zookeeper
export ZOOKEEPER_HOME=/usr/local/apache-zookeeper-3.8.3-bin
PATH=$ZOOKEEPER_HOME/bin:$JAVA_HOME/bin:$PATH
EOFsource /etc/profile
  • 查看版本
zkServer.sh version
  1. kafka
  • 下载Kafka
wget https://downloads.apache.org/kafka/3.7.0/kafka_2.12-3.7.0.tgz
  • 解压Kafka
tar-zxvf kafka_2.12-3.7.0.tgz -C /usr/local/
  • 环境变量
cat>> /etc/profile <<'EOF'
#for kafka
export KAFKA_HOME=/usr/local/kafka_2.12-3.7.0
PATH=$KAFKA_HOME/bin:$JAVA_HOME/bin:$PATH
EOFsource /etc/profile
  • 查看版本
kafka-server-start.sh --version

配置服务

三节点都执行

  1. zookeeper
  • 创建目录
mkdir-p /usr/local/apache-zookeeper-3.8.3-bin/{logs,data}
  • 编辑配置
cat> /usr/local/apache-zookeeper-3.8.3-bin/conf/zoo.cfg <<EOF
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/usr/local/apache-zookeeper-3.8.3-bin/data
dataLogDir=/usr/local/apache-zookeeper-3.8.3-bin/logs
clientPort=2181
admin.serverPort=8888

#集群配置
server.141=elk-node-01:2888:3888
server.142=elk-node-02:2888:3888
server.143=elk-node-03:2888:3888
EOF
  • 编辑myid

三节点分别执行

#kafka-node-01echo"141"> /usr/local/apache-zookeeper-3.8.3-bin/data/myid

#kafka-node-02echo"142"> /usr/local/apache-zookeeper-3.8.3-bin/data/myid

#kafka-node-03echo"143"> /usr/local/apache-zookeeper-3.8.3-bin/data/myid
  1. Kafka
  • 创建目录
mkdir-p /usr/local/kafka_2.12-3.7.0/data
  • 编辑配置
cat> /usr/local/kafka_2.12-3.7.0/config/server.properties <<EOF
#每个节点的broker.id都能一样，broker.id是集群中唯一值
broker.id=0
num.network.threads=3
num.io.threads=8
socket.send.buffer.bytes=102400
socket.receive.buffer.bytes=102400
socket.request.max.bytes=104857600
#端口设置

#集群中数据存储路径
log.dirs=/usr/local/kafka_2.12-3.7.0/data
num.partitions=1
num.recovery.threads.per.data.dir=1
offsets.topic.replication.factor=1
transaction.state.log.replication.factor=1
transaction.state.log.min.isr=1
log.retention.hours=168
log.retention.check.interval.ms=300000
#集群连接ZooKeeper设置
zookeeper.connect=elk-node-01:2181,elk-node-02:2181,elk-node-03:2181/kafka
zookeeper.connection.timeout.ms=18000
group.initial.rebalance.delay.ms=0
EOF
  • 修改broker.id

三节点分别执行

#kafka-node-01sed-i's/broker.id=0/broker.id=141/g' /usr/local/kafka_2.12-3.7.0/config/server.properties

#kafka-node-02sed-i's/broker.id=0/broker.id=142/g' /usr/local/kafka_2.12-3.7.0/config/server.properties

#kafka-node-03sed-i's/broker.id=0/broker.id=143/g' /usr/local/kafka_2.12-3.7.0/config/server.properties

启动服务

三节点都执行

  1. ZooKeeper
#启动服务
zkServer.sh start
  1. Kafka
#启动服务
kafka-server-start.sh -daemon /usr/local/kafka_2.12-3.7.0/config/server.properties

检查服务

三节点都执行

  1. ZooKeeper
  • 查看ZooKeeper集群状态
zkServer.sh status
  • 查看ZooKeeper集群端口
ss -ntl
  • 查看ZooKeeper进程
jps -l
  1. Kafka
  • 查看Kafka集群端口
ss -ntl
  • 查看Kafka进程
jps -l

ELKF部分

安装服务

  1. Elasticsearch

三节点都执行

  • 创建用户
useradd elasticstack
  • 下载安装包
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.17.22-linux-x86_64.tar.gz
  • 安装Elasticsearch
tar-zxvf elasticsearch-7.17.22-linux-x86_64.tar.gz -C /usr/local/
mkdir-p /usr/local/elasticsearch-7.17.22/{data,logs}chown-R elasticstack:elasticstack /usr/local/elasticsearch-7.17.22/
  • 环境变量
cat>> /etc/profile <<'EOF'
#for elasticsearch
export ELASTICSEARCH_HOME=/usr/local/elasticsearch-7.17.22
PATH=$ELASTICSEARCH_HOME/bin:$PATH
EOFsource /etc/profile
  1. Logstash

elk-node-03节点安装

  • 下载安装包
wget https://artifacts.elastic.co/downloads/logstash/logstash-7.17.22-linux-x86_64.tar.gz
  • 安装Logstash
tar-zxvf logstash-7.17.22-linux-x86_64.tar.gz -C /usr/local/
mkdir-p /usr/local/logstash-7.17.22/{data,logs}chown-R elasticstack:elasticstack /usr/local/logstash-7.17.22/
  • 环境变量
cat>> /etc/profile <<'EOF'
#for logstash
export LOGSTASH_HOME=/usr/local/logstash-7.17.22
PATH=$LOGSTASH_HOME/bin:$PATH
EOFsource /etc/profile
  1. Kibana

elk-node-03节点安装

  • 下载安装包
wget https://artifacts.elastic.co/downloads/kibana/kibana-7.17.22-linux-x86_64.tar.gz
  • 安装Kibana
tar-zxvf kibana-7.17.22-linux-x86_64.tar.gz -C /usr/local/
mkdir-p /usr/local/kibana-7.17.22-linux-x86_64/{data,logs}chown-R elasticstack:elasticstack /usr/local/kibana-7.17.22-linux-x86_64/
  • 环境变量
cat>> /etc/profile <<'EOF'
#for kibana
export KIBANA_HOME=/usr/local/kibana-7.17.22-linux-x86_64
PATH=$KIBANA_HOME/bin:$PATH
EOFsource /etc/profile
  1. Filebeat

elk-node-01和elk-node-02节点安装

  • 下载安装包
wget https://artifacts.elastic.co/downloads/beats/filebeat/filebeat-7.17.22-linux-x86_64.tar.gz
  • 安装Filebeat
tar-zxvf filebeat-7.17.22-linux-x86_64.tar.gz -C /usr/local/
chown-R elasticstack:elasticstack /usr/local/filebeat-7.17.22-linux-x86_64/
  • 环境变量
cat>> /etc/profile <<'EOF'
#for filebeat
export FILEBEAT_HOME=/usr/local/filebeat-7.17.22-linux-x86_64
PATH=$FILEBEAT_HOME:$PATH
EOFsource /etc/profile

配置服务

  1. Elasticsearch
  • 编辑配置文件

三节点都执行

cp /usr/local/elasticsearch-7.17.22/config/elasticsearch.yml /usr/local/elasticsearch-7.17.22/config/elasticsearch.yml_`date +%F`cat> /usr/local/elasticsearch-7.17.22/config/elasticsearch.yml <<EOF
cluster.name: ELK-learning
node.name: elk-node
path.data: /usr/local/elasticsearch-7.17.22/data
path.logs: /usr/local/elasticsearch-7.17.22/logs
network.host: 192.168.23.1
http.port: 9200
discovery.seed_hosts: ["192.168.23.141", "192.168.23.142", "192.168.23.143"]
cluster.initial_master_nodes: ["192.168.23.141", "192.168.23.142", "192.168.23.143"]
EOF
  • 调整配置文件

三节点分别执行

#elk-node-01sed-i's/node.name: elk-node/node.name: elk-node-01/g' /usr/local/elasticsearch-7.17.22/config/elasticsearch.yml
sed-i's/network.host: 192.168.23.1/network.host: 192.168.23.141/g' /usr/local/elasticsearch-7.17.22/config/elasticsearch.yml

#elk-node-02sed-i's/node.name: elk-node/node.name: elk-node-02/g' /usr/local/elasticsearch-7.17.22/config/elasticsearch.yml
sed-i's/network.host: 192.168.23.1/network.host: 192.168.23.142/g' /usr/local/elasticsearch-7.17.22/config/elasticsearch.yml

#elk-node-03sed-i's/node.name: elk-node/node.name: elk-node-03/g' /usr/local/elasticsearch-7.17.22/config/elasticsearch.yml
sed-i's/network.host: 192.168.23.1/network.host: 192.168.23.143/g' /usr/local/elasticsearch-7.17.22/config/elasticsearch.yml
  1. Logstash
  • 编辑配置文件

elk-node-03节点执行

cp /usr/local/logstash-7.17.22/config/logstash.yml /usr/local/logstash-7.17.22/config/logstash.yml_`date +%F`cat> /usr/local/logstash-7.17.22/config/logstash.yml <<EOF
#设置节点名称，一般使用主机名
node.name: elk-node-03
#logstash存储插件等数据目录
path.data: /usr/local/logstash-7.17.22/data
#Logstash监听地址
http.host: "0.0.0.0"
#Logstash监听端口，可以是单个端口，也可以是范围端口，默认9600-9700
http.port: 9600
#Logstash日志存放路径
path.logs: /usr/local/logstash-7.17.22/logs
EOF
  1. Kibana
  • 编辑配置文件

elk-node-03节点执行

cp /usr/local/kibana-7.17.22-linux-x86_64/config/kibana.yml /usr/local/kibana-7.17.22-linux-x86_64/config/kibana.yml_`date +%F`cat> /usr/local/kibana-7.17.22-linux-x86_64/config/kibana.yml <<EOF
server.port: 5601
server.host: "192.168.23.143"
server.maxPayload: 1048576
server.name: "ELK-Kibana"
elasticsearch.hosts: ["http://192.168.23.141:9200", "http://192.168.23.142:9200", "http://192.168.23.143:9200"]
i18n.locale: "zh-CN"
EOF
  1. Filebeat

elk-node-01和elk-node-02节点执行

  • 编辑配置
cat> /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-stdin-to-console.yml <<EOF
filebeat.inputs:
- type: stdin

output.console:
  pretty: true
EOF

启动/检查服务

  1. Elasticsearch

三节点都执行

  • 启动服务
su - elasticstack
nohup elasticsearch &
  • 检查端口
ss -ntl
  • 验证服务
curl-iv192.168.23.141:9200
curl-iv192.168.23.142:9200
curl-iv192.168.23.143:9200
  1. Logstash

elk-node-03节点执行

  • 编译采集配置–测试使用
cp /usr/local/logstash-7.17.22/config/logstash-sample.conf /usr/local/logstash-7.17.22/config/logstash-sample.conf_`date +%F`cat> /usr/local/logstash-7.17.22/config/logstash-sample.conf <<EOF
input {
  stdin { }
}

output {
  stdout { }
}
EOFchown elasticstack:elasticstack /usr/local/logstash-7.17.22/config/logstash-sample.conf
  • 启动服务
su - elasticstack
logstash -f /usr/local/logstash-7.17.22/config/logstash-sample.conf
  1. Kibana

elk-node-03节点执行

  • 启动服务
su - elasticstack
nohup kibana &
  • 验证服务
curl-iv http://192.168.23.143:5601
  1. Filebeat

elk-node-01和elk-node-02节点执行

  • 编辑采集配置–测试使用
cat> /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-stdin-to-console.yml <<EOF
filebeat.inputs:
- type: stdin

output.console:
  pretty: true
EOFchmod go-w /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-stdin-to-console.yml
chown elasticstack:elasticstack /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-stdin-to-console.yml
  • 启动服务
su - elasticstack
filebeat -e-c /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-stdin-to-console.yml

ELKF+Kafka整合

Kafka调整

  • 创建topic
#测试使用topic
kafka-topics.sh --bootstrap-server "192.168.23.141:9092,192.168.23.142:9092,192.168.23.143:9092"--create--topic"test"--partitions3 --replication-factor 3
  • 查看topic
kafka-topics.sh --bootstrap-server "192.168.23.141:9092,192.168.23.142:9092,192.168.23.143:9092"--list

Logstash调整

  • 编辑采集文件
cat> /usr/local/logstash-7.17.22/config/logstash-kafka.conf <<EOF
input {
  kafka {
    bootstrap_servers => ["192.168.23.141:9092,192.168.23.142:9092,192.168.23.143:9092"]
    topics => "test"
  }
}

output {
  elasticsearch {
    hosts => ["http://192.168.23.141:9200", "http://192.168.23.142:9200", "http://192.168.23.143:9200"]
    index => "app-logs-%{+YYYY.MM.dd}"
    #user => "elastic"
    #password => "changeme"
  }
}
EOFchown elasticstack:elasticstack /usr/local/logstash-7.17.22/config/logstash-kafka.conf
  • 启动Logstash
nohup logstash -f /usr/local/logstash-7.17.22/config/logstash-kafka.conf &

Filebeat调整-测试使用

  • 编辑配置文件
cat> /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-kafka.yml <<EOF
filebeat.inputs:
- type: stdin

#定义日志输出
output.kafka:
  enabled: true
  hosts: ["192.168.23.141:9092","192.168.23.142:9092","192.168.23.143:9092"]
  topic: "test"
EOFchown elasticstack:elasticstack /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-kafka.yml
  • 启动Filebeat
filebeat -e-c /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-kafka.yml

ELKF+Kafka采集日志

Kafka主题

  • 创建主题
#创建Nginx主题
kafka-topics.sh --bootstrap-server "192.168.23.141:9092,192.168.23.142:9092,192.168.23.143:9092"--create--topic"nginx"--partitions3 --replication-factor 3#创建Tomcat主题
kafka-topics.sh --bootstrap-server "192.168.23.141:9092,192.168.23.142:9092,192.168.23.143:9092"--create--topic"tomcat"--partitions3 --replication-factor 3
  • 查看主题
kafka-topics.sh --bootstrap-server "192.168.23.141:9092,192.168.23.142:9092,192.168.23.143:9092"--list

Nginx环境

安装Nginx

useradd nginx
wget https://nginx.org/download/nginx-1.22.1.tar.gz
tar-zxvf nginx-1.22.1.tar.gz -C /usr/local/
cd /usr/local/nginx-1.22.1
./configure --prefix=/usr/local/nginx \--user=nginx --group=nginx \
--with-http_realip_module \
--with-http_v2_module \
--with-http_stub_status_module \
--with-http_ssl_module \
--with-http_gzip_static_module \
--with-stream \
--with-stream_ssl_module \
--with-http_sub_module
chown-R nginx:nginx /usr/local/nginx

配置Nginx

mkdir-p /data/html/
cat> /data/html/index.html <<EOF
test learning for EFK
EFK 的学习测试
EOFchown-R nginx:nginx /data/html/

cat> /usr/local/nginx/conf/nginx.conf <<'EOF'
worker_processes  1;
error_log  logs/error.log  info;
pid        logs/nginx.pid;
events {
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  application/octet-stream;
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    access_log  logs/access.log  main;
    sendfile        on;
    keepalive_timeout  65;
    server {
        listen       80;
        server_name  localhost;
        charset utf-8;
        location / {
            root   /data/html/;
            index  index.html index.htm;
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}
EOF

启动Nginx

setcap cap_net_bind_service=+ep /usr/local/nginx/sbin/nginx
su - nginx
/usr/local/nginx/sbin/nginx -t
/usr/local/nginx/sbin/nginx

日志采集-原生日志

  • 编辑filebeat配置文件
cat> /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-kafka.yml <<EOF
filebeat.inputs:
#定义Nginx access日志收集
- type: log
  enabled: true
  paths:
  - /usr/local/nginx/logs/access.log*
  #自定义tag
  tags: ["Nginx", "logs", "access"]

#定义Nginx error日志收集
- type: log
  enabled: true
  paths:
  - /usr/local/nginx/logs/error.log*
  #自定义tag
  tags: ["Nginx", "logs", "error"]
  
#定义Elasticsearch模板配置
setup.template.settings:
  #定义Elasticsearch中每个索引的主分片数量，单位个
  index.number_of_shards: 3
  #定义Elasticsearch中每个索引的副本分片数量，单位个（注意：设置的副本数量需要小于Elasticsearch集群的主机数量）
  index.number_of_replicas: 2
  #定义Elasticsearch中每个索引的刷新频率，单位秒（s）
  index.refresh_interval: 5s

#禁用索引生命周期管理(如果不禁用，自定义索引无法生效)
setup.ilm.enabled: false
#自定义索引名称
setup.template.name: "app-logs"
#自定义索引匹配规则
setup.template.pattern: "app-logs*"

#定义日志输出
output.kafka:
  enabled: true
  hosts: ["192.168.23.141:9092","192.168.23.142:9092","192.168.23.143:9092"]
  topic: "nginx"
EOF
  • 启动Filebeat
filebeat -e-c /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-kafka.yml

Tomcat环境

安装Tomcat

#安装JDK#上传JDK安装包tar-zxvf jdk-8u401-linux-x64.tar.gz -C /usr/local/
cat>> /etc/profile <<'EOF'exportHISTTIMEFORMAT="%F %T "exportJAVA_HOME=/usr/local/jdk1.8.0_401/
exportPATH=$JAVA_HOME/bin:$PATHexportCLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
EOF

#安装Tomcatwget https://archive.apache.org/dist/tomcat/tomcat-7/v7.0.109/bin/apache-tomcat-7.0.109.tar.gz
tar-zxvf apache-tomcat-7.0.109.tar.gz -C /usr/local/

useradd tomcat
chown-R tomcat:tomcat /usr/local/apache-tomcat-7.0.109/

启动Tomcat

su - tomcat
/usr/local/apache-tomcat-7.0.109/bin/startup.sh

日志采集-原生日志

  • 编辑Filebeat配置文件
cat> /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-kafka.yml <<EOF
filebeat.inputs:
#定义Tomcat catalina日志收集
- type: log
  enabled: true
  paths:
  - /usr/local/apache-tomcat-7.0.109/logs/catalina*
  #自定义tag
  tags: ["Tomcat", "logs", "catalina"]

#定义Tomcat host-manager日志收集
- type: log
  enabled: true
  paths:
  - /usr/local/apache-tomcat-7.0.109/logs/host-manager*
  #自定义tag
  tags: ["Tomcat", "logs", "host-manager"]
  
#定义Tomcat localhost日志收集
- type: log
  enabled: true
  paths:
  - /usr/local/apache-tomcat-7.0.109/logs/localhost*
  #自定义tag
  tags: ["Tomcat", "logs", "localhost"]
  
#定义Tomcat manager日志收集
- type: log
  enabled: true
  paths:
  - /usr/local/apache-tomcat-7.0.109/logs/manager*
  #自定义tag
  tags: ["Tomcat", "logs", "manager"]
  
#定义Elasticsearch模板配置
setup.template.settings:
  #定义Elasticsearch中每个索引的主分片数量，单位个
  index.number_of_shards: 3
  #定义Elasticsearch中每个索引的副本分片数量，单位个（注意：设置的副本数量需要小于Elasticsearch集群的主机数量）
  index.number_of_replicas: 2
  #定义Elasticsearch中每个索引的刷新频率，单位秒（s）
  index.refresh_interval: 5s

#禁用索引生命周期管理(如果不禁用，自定义索引无法生效)
setup.ilm.enabled: false
#自定义索引名称
setup.template.name: "app-logs"
#自定义索引匹配规则
setup.template.pattern: "app-logs*"

#定义日志输出
output.kafka:
  enabled: true
  hosts: ["192.168.23.141:9092","192.168.23.142:9092","192.168.23.143:9092"]
  topic: "tomcat"
EOF
  • 启动Filebeat
filebeat -e-c /usr/local/filebeat-7.17.22-linux-x86_64/filebeat-kafka.yml
标签： elk
本文转载自: https://blog.csdn.net/weixin_40901913/article/details/140490288
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