rpm 安装Logstash
下载地址：https://www.elastic.co/cn/downloads/past-releases#logstash
安装：rpm -ivh logstash-7.8.1.rpm
配置：vi /etc/logstash/logstash-sample.conf
复制到配置文件下下面：cp /etc/logstash/logstash-sample.conf /etc/logstash/conf.d/logstash-sample.conf
启动：systemctl start logstash
启动失败查看日志：could not find java; set JAVA_HOME or ensure java is in PATH
使用java -version发现是配置好的，找到安装目录下/bin/logstash.lib.sh文件，并写入以下内容就可以了：
JAVA_HOME=/usr/local/java/jdk1.8.0_231
停止：systemctl stop logstash
重启：systemctl restart logstash
开机自启动：systemctl enable logstash
开机不启动：systemctl disable logstash