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
-
- 先部署
9501服务
- 先部署
-
- 单起一个进程，定时轮询Git分支是否有新版本发布
-
- 如有新版本发布，clone一份
-
- composer update 更新库
-
- 启动
9502服务
- 启动
- 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
- Nginx负载均衡和反向代理
- EasySwoole自定义进程
- 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。