ubuntu18安装LEMP

sudo apt update 
sudo apt install nginx
ps -aux | grep nginx
nginx -v
sudo ufw allow 'Nginx HTTP'
sudo ufw status
curl localhost
sudo apt install mysql-server-5.7
sudo mysql_secure_installation

xhs@xhs:~$ sudo apt install php-fpm
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package php-fpm

apt-cache search fpm
换成阿里云的源装了个php5-fpm
打算再换回官方的源装php7-mysql
转念一想，fpm或cgi都只是nginx和php的通讯工具，装哪个都可以
就还是装php7-cgi
sudo apt remove php5-fpm
转来转去，还是要安装 fpm
先添加源
add-apt-repository ppa:ondrej/php
apt update 后终于有php-fpm了
但依赖有点问题
xhs@xhs:/etc/nginx$ sudo apt install php7.2-fpm
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 php7.2-fpm : Depends: php7.2-common (= 7.2.9-1+ubuntu18.04.1+deb.sury.org+1) but 7.2.10-0ubuntu0.18.04.1 is to be installed
E: Unable to correct problems, you have held broken packages.
先卸载之前的吧
dpkg -l | grep php
没理解提示信息，卸载了还是装不上，又update了一下
看到有php7.3版本的，试着安装
sudo apt install php7.3-fpm
可以了
xhs@xhs:/etc/nginx$ systemctl restart php7.3-fpm.service 
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to restart 'php7.3-fpm.service'.
Authenticating as: xhs
Password: 
==== AUTHENTICATION COMPLETE ===
xhs@xhs:/etc/nginx$ sudo netstat -pantu | grep 9000
xhs@xhs:/etc/nginx$ sudo netstat -pantu | grep 9000
xhs@xhs:/etc/nginx$ systemctl status php
php5-fpm.service         php7.3-fpm.service       php-fpm.service          phpsessionclean.service  phpsessionclean.timer    
xhs@xhs:/etc/nginx$ systemctl status php
php5-fpm.service         php7.3-fpm.service       php-fpm.service          phpsessionclean.service  phpsessionclean.timer    
xhs@xhs:/etc/nginx$ systemctl status php7.3-fpm.service 
● php7.3-fpm.service - The PHP 7.3 FastCGI Process Manager
   Loaded: loaded (/lib/systemd/system/php7.3-fpm.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2018-09-27 10:24:05 UTC; 33s ago
     Docs: man:php-fpm7.3(8)
 Main PID: 20140 (php-fpm7.3)
   Status: "Processes active: 0, idle: 2, Requests: 0, slow: 0, Traffic: 0req/sec"
    Tasks: 3 (limit: 2322)
   CGroup: /system.slice/php7.3-fpm.service
           ├─20140 php-fpm: master process (/etc/php/7.3/fpm/php-fpm.conf)
           ├─20154 php-fpm: pool www
           └─20155 php-fpm: pool www

Sep 27 10:24:05 xhs systemd[1]: Stopped The PHP 7.3 FastCGI Process Manager.
Sep 27 10:24:05 xhs systemd[1]: Starting The PHP 7.3 FastCGI Process Manager...
Sep 27 10:24:05 xhs systemd[1]: Started The PHP 7.3 FastCGI Process Manager.
xhs@xhs:/etc/nginx$ 
启动fpm
systemctl restart php7.2-fpm #重启
其他相关命令
systemctl start php7.2-fpm #启动
systemctl stop php7.2-fpm #关闭
systemctl status php7.2-fpm #检查状态

接着修改nginx配置文件
ps -aux | grep 9000 查不到 fpm 9000 端口的开启信息
原来还有另一种方式连接，unix sock
    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
    
        #With php-fpm (or other unix sockets):
        fastcgi_pass unix:/var/run/php/php7.3-fpm.sock;
        #With php-cgi (or other tcp sockets):
        #fastcgi_pass 127.0.0.1:9000;
    }