1： build redis模块redis.so：

//For Debian-based Linux distros you need a php-dev and pkg-php-tools packages 
//to build native PHP extension from phpredis source code
sudo apt update
sudo apt install php-dev pkg-php-tools --yes
sudo pecl channel-update pecl.php.net
sudo pecl install redis

如果遇到第三步pecl有warning

Warning: foreach() argument must be of type array|object, null given in Command.php on line 249
PHP Warning:  foreach() argument must be of type array|object, null given in /usr/share/php/PEAR/Command.php on line 249

Warning: Undefined array key "phpfile" in Role.php on line 204
PHP Warning:  Undefined array key "phpfile" in /usr/share/php/PEAR/Installer/Role.php on line 204

Warning: Undefined array key "config_vars" in Role.php on line 46
PHP Warning:  Undefined array key "config_vars" in /usr/share/php/PEAR/Installer/Role.php on line 46

Warning: Undefined array key "config_vars" in Role.php on line 46
PHP Warning:  Undefined array key "config_vars" in /usr/share/php/PEAR/Installer/Role.php on line 46

执行这行，更新php到最新版8.0.3

sudo apt-get install php-xml php7.0-xml

2: 配置启动redis.so extension

//Build process completed successfully
//Installing '/usr/lib/php/20200930/redis.so'
//install ok: channel://pecl.php.net/redis-5.3.3
//configuration option "php_ini" is not set to php.ini location
//You should add "extension=redis.so" to php.ini

sudo vim /etc/php/8.0/cli/php.ini

//add one line of extension

extension=redis.so