传统滚动发版

nginx探活

server 192.168.4.20:9090 weight=1;
server 192.168.3.20:9090 weight=1;
check interval=2000 rise=3 fall=3 timeout=1000 type=http;
check_http_send "GET /healthcheck HTTP/1.0\r\n\r\n";
check_http_expect_alive http_2xx http_3xx;

Spring boot健康检查

@Controller
public class HealthController {
    private static ApplicationHome home = new ApplicationHome(Application.class);
    private static Path path = Path.of(home.getDir() + "/healthcheck.html");

    @RequestMapping("/healthcheck")
    public void health(HttpServletRequest request, HttpServletResponse response) throws IOException {
        OutputStream os = response.getOutputStream();
        if (Files.exists(path.toAbsolutePath())) {
            response.setStatus(200);
            os.write("up".getBytes(StandardCharsets.UTF_8));
            response.flushBuffer();
        } else {
            os.write("down".getBytes(StandardCharsets.UTF_8));
            response.setStatus(500);
        }
    }
}

Jenkins 配置

pipeline {
    agent any
    tools {
        jdk 'jdk13'
        maven 'mvn3.6.3'
    }
    environment {
        backup_time='$(date +%Y%m%d-%H%M%S)'
        p_name='edu-chat-1.0-SNAPSHOT.jar'
        aws_dir='/data/work/chatservice/'
        w_dir='/data/jenkins/workspace/${JOB_NAME}/chat/target/'
    }
    stages {
        stage('拉取代码') {
            steps {
                deleteDir()
                git branch: 'dev_add_healthcheck_20210622_congsl', credentialsId: 'f2874221-e912-4949-8646-ca450254799f', url: 'git@github.com:pplingo/chatservice.git'
            }
        }
        stage('安装依赖&&构建项目') {
            steps {
                sh """
                echo "---> 安装依赖&&构建项目"
                mvn -v
                java -version
                mvn clean install
                """
            }
        }
        stage('发布') {
            steps {
                sh """
                echo "---> 发布java_c_api"
                #ansible awsbackend1$num -m shell -a 'cp -rp ${env.aws_dir}${env.p_name} ${env.aws_dir}${env.p_name}-${env.backup_time}'
				#已经存在/data/work/chatservice/healthcheck.html 文件，拉取代码后删除此文件，程序检测文件不存在将后端请求设置为非200,300。Tengine将后端服务端口设为Down,不会在向后端服务器转发请求，这时候可也进行Update。
				ansible awsbackend1$num -m shell -a 'rm -rf /data/work/chatservice/healthcheck.html'
				#休眠6秒，Tengine检测后端超时时间
				sleep 6
				echo "---> 已将后端java端口设为down"
                ansible awsbackend1$num -m copy -a 'src=${env.w_dir}${p_name} dest=${env.aws_dir} owner=centos group=centos force=yes'
                ansible awsbackend1$num -m shell -a 'unlink ${env.aws_dir}edu-chat.jar'
                ansible awsbackend1$num -b -m shell -a 'ln -sf ${env.aws_dir}edu-chat-1.0-SNAPSHOT.jar ${env.aws_dir}edu-chat.jar'
                ansible awsbackend1$num -b -m shell -a 'supervisorctl restart edu-chat'
				echo "---> 服务已重启，休眠17秒"
				#服务重启，休眠17秒，保证服务重启。
				sleep 17
				#服务重启后，进行创建文件，Tengine会将端口重新转发到后端服务器。
				ansible awsbackend1$num -m shell -a 'touch /data/work/chatservice/healthcheck.html'
                """
            }
        }        

    }
}