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INSTALL-CentOS7.md

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Installation instructions for CentOS 7

Assumptions

server.example.com (ELK master)

client.example.com (client machine)

ELK Stack installation on server.example.com

Install Java 8
yum install -y java-1.8.0-openjdk
Import PGP Key
rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch
Create Yum repository
cat >>/etc/yum.repos.d/elk.repo<<EOF
[ELK-6.x]
name=ELK repository for 6.x packages
baseurl=https://artifacts.elastic.co/packages/6.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md
EOF

Elasticsearch

Install Elasticsearch
yum install -y elasticsearch
Enable and start elasticsearch service
systemctl daemon-reload
systemctl enable elasticsearch
systemctl start elasticsearch

Kibana

Install kibana
yum install -y kibana
Enable and start kibana service
systemctl daemon-reload
systemctl enable kibana
systemctl start kibana
Install Nginx
yum install -y epel-release
yum install -y nginx
Create Proxy configuration

Remove server block from the default config file /etc/nginx/nginx.conf And create a new config file

cat >>/etc/nginx/conf.d/kibana.conf<<EOF
server {
    listen 80;
    server_name server.example.com;
    location / {
        proxy_pass http://localhost:5601;
    }
}
EOF
Enable and start nginx service
systemctl enable nginx
systemctl start nginx

Logstash

Install logstash
yum install -y logstash
Generate SSL Certificates
openssl req -subj '/CN=server.example.com/' -x509 -days 3650 -nodes -batch -newkey rsa:2048 -keyout /etc/pki/tls/private/logstash.key -out /etc/pki/tls/certs/logstash.crt
Create Logstash config file
vi /etc/logstash/conf.d/01-logstash-simple.conf

Paste the below content

input {
  beats {
    port => 5044
    ssl => true
    ssl_certificate => "/etc/pki/tls/certs/logstash.crt"
    ssl_key => "/etc/pki/tls/private/logstash.key"
  }
}

filter {
    if [type] == "syslog" {
        grok {
            match => {
                "message" => "%{SYSLOGTIMESTAMP:syslog_timestamp} %{SYSLOGHOST:syslog_hostname} %{DATA:syslog_program}(?:\[%{POSINT:syslog_pid}\])?: %{GREEDYDATA:syslog_message}"
            }
            add_field => [ "received_at", "%{@timestamp}" ]
            add_field => [ "received_from", "%{host}" ]
        }
        syslog_pri { }
        date {
            match => [ "syslog_timestamp", "MMM  d HH:mm:ss", "MMM dd HH:mm:ss" ]
        }
    }
}

output {
    elasticsearch {
        hosts => "localhost:9200"
        index => "%{[@metadata][beat]}-%{+YYYY.MM.dd}"
    }
}
Enable and Start logstash service
systemctl enable logstash
systemctl start logstash

FileBeat installation on client.example.com

Create Yum repository
cat >>/etc/yum.repos.d/elk.repo<<EOF
[ELK-6.x]
name=ELK repository for 6.x packages
baseurl=https://artifacts.elastic.co/packages/6.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md
EOF
Install Filebeat
yum install -y filebeat
Copy SSL certificate from server.example.com
scp server.example.com:/etc/pki/tls/certs/logstash.crt /etc/pki/tls/certs/
Configure Filebeat

[Refer my youtube video]

Enable and start Filebeat service
systemctl enable filebeat
systemctl start filebeat

Configure Kibana Dashboard

All done. Now you can head to Kibana dashboard and add the index.