ELK 安装过程补充(不建议看，很少)

1、yum 安装ELK服务

参考文档：https://blog.csdn.net/tonghudan/article/details/81414387

rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

cat>/etc/yum.repos.d/elasticsearch.repo<<EOF
[elasticsearch-6.x]
name=Elasticsearch 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

yum clean all
yum install elasticsearch logstash kibana -y