安装redis服务
sudo apt-get install redis-server
装好之后默认就是自启动、后台运行的，无需过多设置，安装目录应该是/etc/redis
启动
sudo service redis-server start
然后运行客户端命令redis-cli能够出现命令提示符127.0.0.1:6379: >就算成功了！
安装 PHP 7.4
sudo apt-get update
sudo apt -y install software-properties-common
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt -y install php7.4
验证版本
php -v
PHP 7.4.8 (cli) (built: Jul 13 2020 16:45:47) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
with Zend OPcache v7.4.8, Copyright (c), by Zend Technologies
安装依赖
sudo apt-get install -y php7.4-{bcmath,bz2,intl,gd,mbstring,mysql,zip,redis}
sudo apt-get install -y php7.4-{bcmath,bz2,calendar,ctype,curl,dom,exif,ffi,fileinfo,ftp,gd,gettext,iconv,igbinary,intl,json,mbstring,mysqlnd,mysqli,opcache,pdo,phar,posix,readline,redis,shmop,simplexml,soap,sockets,sysvmsg,sysvsem,sysvshm,tokenizer,xmlreader,xml,xmlwriter,xsl,zip}
要是也频繁超时的话，可以一个个安装。
例如redis
sudo apt-get install -y php7.4-redis
验证扩展
$ php -m |grep redis
redis
