Easyswoole利用Nginx实现服务不中断部署

1. 介绍

近几天有幸接触到Nginx反向代理、负载均衡相关知识，为了加深印象，感觉还是有必要自己去踩一遍坑。

2. 学习案例

EasySwoole+git+Nginx 实现服务的不中断部署

• 1. 先部署9501服务
• 2. 单起一个进程，定时轮询Git分支是否有新版本发布
• 3. 如有新版本发布，clone一份
• 4. composer update 更新库
• 5. 启动9502服务
• 6 更改nginx配置为9502并重启

只要有新版本发布，就轮询上面那几个步骤

整个过程的简单架构图

image.png

3. 提前需要了解的知识点

1. Nginx负载均衡和反向代理
2. EasySwoole自定义进程
3. Nginx reload 和 restart的区别

4. Nginx 配置

nginx.conf

当有新版本发布的时候EasySwoole自定义进程会将nginx.conf 的端口改为最新服务

worker_processes  1;

events {
    worker_connections  1024;
}

http {

    include       mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    sendfile        on;
 
    keepalive_timeout  65;
    
    // 轮询配置(这里是重点)
    upstream  easyswoole.relase.com {
           server    127.0.0.1:9501;
    }

    server {
        listen       8080;
        server_name  localhost;
    }

    include servers/*;
}

es-release.conf

server {
        listen       80;
        server_name  easyswoole.relase.com;

        location / {
            root html;
            index index.html index.htm;
            proxy_pass http://easyswoole.relase.com; // 这里是重点
        }

        access_log /usr/local/etc/nginx/logs/es.access.log main;
        error_log /usr/local/etc/nginx/logs/es.error.log error;
}%

5. EasySwoole 代码实现

只是为了学习记录，代码有些粗糙，并且这种定时检查代码是否有新版本，最好单独去做，比如用shell脚本

自定义进程文件

> /Users/xxx/sites/shell.log';
                error_log('开始检测代码是否更新5'.PHP_EOL, 3, '/Users/xxx/sites/es-log.log');

                // 检查Git是否有新代码发布
                $diffExec = 'cd ' .EASYSWOOLE_ROOT. '; git fetch; git diff --stat master origin/master;';
                $pullResult = exec($diffExec);
                error_log(json_encode($pullResult), 3, '/Users/xxx/sites/es-log.log');

                if ($pullResult !== '') {
                    error_log('有新版本发布'.PHP_EOL, 3, '/Users/xxx/sites/es-log.log');

                    // 新版本项目的目录
                    $newVersionPath = '/Users/xxx/sites/relase-'.time();

                    // 开始clone, 初始化代码
                    $cloneExec = "git clone https://github.com/huizhang-Easyswoole/release.git {$newVersionPath} {$shellLog};cd {$newVersionPath} {$shellLog};composer update {$shellLog}; {$shellLog}";
                    $res = exec($cloneExec, $a, $b);
                    error_log('新版本代码clone'.PHP_EOL, 3, '/Users/xxx/sites/es-log.log');

                    // 判断当前是哪个端口正在服务
                    $lsofExec = "lsof -i:9501 {$shellLog}";
                    $lsofResult = exec($lsofExec);
                    $newPort = 9501;
                    $oldPort = 9502;
                    if ($lsofResult !== '') {
                        $newPort = 9502;
                        $oldPort = 9501;
                    }

                    // 将另一个闲置的端口，替换到新版本中
                    error_log('开始替换端口'.$newPort.PHP_EOL, 3, '/Users/xxx/sites/es-log.log');

                    $devConfig = file_get_contents($newVersionPath.'/dev.php');
                    $devConfig = str_replace($oldPort, $newPort, $devConfig);
                    file_put_contents($newVersionPath.'/dev.php', $devConfig);

                    // 启动新服务(这一刻新旧服务是同时存在的)
                    error_log('新服务启动'.PHP_EOL, 3, '/Users/xxx/sites/es-log.log');
                    $startExec = "cd {$newVersionPath}; php easyswoole start d {$shellLog}";
                    exec($startExec);

                    // 替换nginx配置
                    error_log('开始替换ng端口'.PHP_EOL, 3, '/Users/xxx/sites/es-log.log');
                    $ngConfigPath = '/usr/local/etc/nginx/nginx.conf';
                    $ngConfig  = file_get_contents($ngConfigPath);
                    $ngConfig = str_replace($oldPort, $newPort, $ngConfig);
                    file_put_contents($ngConfigPath, $ngConfig);

                    // 重启Nginx
                    error_log('重启ng'.PHP_EOL, 3, '/Users/xxx/sites/es-log.log');
                    $reloadNgExec = "nginx -s reload {$shellLog}";
                    exec($reloadNgExec);

                    // 停掉旧服务
                    error_log('旧服务停掉'.PHP_EOL, 3, '/Users/xxx/sites/es-log.log');
                    $stopExec = "cd ".EASYSWOOLE_ROOT."; php easyswoole stop {$shellLog}";
                    exec($stopExec);

                    // 每30秒同步一次代码
                    Coroutine::sleep(30);
                } else {
                    error_log('无新版本'.PHP_EOL, 3, '/Users/xxx/sites/es-log.log');

                }

            }
        });

    }

}

进程注册

getSwooleServer()->addProcess($process->getProcess());
    }

    public static function onRequest(Request $request, Response $response): bool
    {
        // TODO: Implement onRequest() method.
        return true;
    }

    public static function afterRequest(Request $request, Response $response): void
    {
        // TODO: Implement afterAction() method.
    }
}

7. 测试

绑定host

127.0.0.1 easyswoole.relase.com

访问easyswoole.relase.com

image.png

查看Nginx配置的端口

➜  nginx cat nginx.conf | grep 950
           server    127.0.0.1:9501;

发布新版本

重新clone一份代码，更改内容提交。

查看Nginx配置的端口

➜  nginx cat nginx.conf | grep 950
           server    127.0.0.1:9502;

这样就简单实现了利用Nginx的反向代理+负载均衡功能实现了EasySwoole的服务不中断部署功能。