问题：重新安装php7.4-fpm时报错
Not replacing deleted config file /etc/php/7.4/fpm/php.ini
Failed to start The PHP 7.4 FastCGI Process Manager.
ERROR: failed to open configuration file '/etc/php/7.4/fpm/php-fpm.conf': No such file or directory

解决：这是因为卸载的不干净，所以无法安装

方法：

重新卸载
sudo apt remove php7.4-fpm
sudo dpkg -P php7.4-fpm
再次安装
sudo apt install php7.4-fpm

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问题：logstash如何配置系统服务？

方法：

在logstash项目下

bin/system-install

服务启动

sudo su
systemctl daemon-reload
systemctl start logstash.service

如果报错logstash.service: Failed with result 'exit-code'.
查看错误日志

vim /var/log/message
logstash.service: Failed at step USER spawning

说明是没有用户

vim /etc/systemd/system/logstash.service

将user,group改成当前logstash目录的用户和组，然后

systemctl daemon-reload
systemctl restart logstash.service

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问题：

npm install 安装elasticsearch-head报错，需要安装phantomjs-prebuilt@2.1.14

参考：

https://blog.csdn.net/Stars1sea/article/details/133337740
https://blog.csdn.net/yangkei/article/details/126708031

问题：rpm如何指定安装路径？

方法：

sudo rpm -i elasticsearch-7.12.0-x86_64.rpm --prefix=/opt/module/
不过安装elasticsearch不建议指定目录

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