php 5.3.3 以后的php-fpm 不再支持 php-fpm(start|stop|reload)等命令，所以不在介绍旧的方法，需要使用新的信号控制：

INT, TERM 立刻终止

QUIT 平滑终止

USR1 重新打开日志文件

USR2 平滑重载所有worker进程并重新载入配置和二进制模块

现在看下如何重启：

1.先查看php-fpm的master进程号

[root@iZ2ze1o1f17iu7osdy7bukZ ~]# ps aux | grep php-fpm  |grep  master

root       84659  0.0  0.2 129476  8216 ?        Ss   Feb19   0:12 php-fpm: master process (/www/server/php/56/etc/php-fpm.conf)

root       84676  0.0  0.2 129476  8208 ?        Ss   Feb19   0:12 php-fpm: master process (/www/server/php/56/etc/php-fpm.conf)

root      125290  0.0  0.2 126836  9528 ?        Ss   Feb20   0:11 php-fpm: master process (/www/server/php/73/etc/php-fpm.conf)

root      526126  0.0  0.3 275668 12116 ?        Ss   21:27   0:00 php-fpm: master process (/www/server/php/73/etc/php-fpm.conf)

2.从上面找到php7.3的配置文件查看里面pid路径

[root@iZ2ze1o1f17iu7osdy7bukZ ~]# cat  /www/server/php/73/etc/php-fpm.conf

[global]pid = /www/server/php/73/var/run/php-fpm.pid

error_log = /www/server/php/73/var/log/php-fpm.log

log_level = notice

[www]

listen = /tmp/php-cgi-73.sock

listen.backlog = 8192

listen.allowed_clients = 127.0.0.1

listen.owner = www

listen.group = www

listen.mode = 0666

user = www

group = www

pm = dynamic

pm.status_path = /phpfpm_73_status

pm.max_children = 80

pm.start_servers = 5

pm.min_spare_servers = 5

pm.max_spare_servers = 20

request_terminate_timeout = 100

request_slowlog_timeout = 30

slowlog = var/log/slow.log

3.查看php7.3的php-fpm的pid

[root@iZ2ze1o1f17iu7osdy7bukZ ~]# cat  /www/server/php/73/var/run/php-fpm.pid

526899

4.重启7.3的php-fpm

kill -USR2   526899

5.整合到一起重启php7.3的php-fpm，注意下面不是单引号，是反引号

重启

kill -USR2    `cat  /www/server/php/73/var/run/php-fpm.pid`

停止

kill -INT    `cat  /www/server/php/73/var/run/php-fpm.pid`