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  • varnish-4.x VCL之healthy check

    varnish-4.x VCL之healthy check

    更多帮助请man vcl

    示例：
    如下是本人测试的示例文件,包含healthcheck申明,director引用, purge acl

    vcl 4.0;

    import std;
    import directors;

    probe healthcheck_nginx {
        .url = "/healthy.jpg";
        .timeout = 3s;
        .interval = 5s;
        .window = 5;
        .threshold = 3;
    }
    probe healthcheck_apache {
        .url = "/healthy.jpg";
        .timeout = 3s;
        .interval = 5s;
        .window = 5;
        .threshold = 3;
    }
    backend nginx {
        .host = "192.168.192.10";
        .port = "8080";
        .connect_timeout = 3s;
        .first_byte_timeout = 5s;
        .between_bytes_timeout = 5s;
        .max_connections = 30000;
        .probe = healthcheck_nginx;
    }
    backend apache {
        .host = "192.168.192.10";
        .port = "8081";
        .connect_timeout = 3s;
        .first_byte_timeout = 5s;
        .between_bytes_timeout = 5s;
        .max_connections = 3000;
        .probe = healthcheck_apache;
    }

    sub vcl_init {
        new round_robin_director = directors.round_robin();
        round_robin_director.add_backend(apache);
        round_robin_director.add_backend(nginx);

        new random_director = directors.random();
        random_director.add_backend(nginx, 10);
        random_director.add_backend(apache, 5);

        new hash_director = directors.hash();
        hash_director.add_backend(nginx, 10);
        hash_director.add_backend(apache, 5);
    }

    acl purgers {
        "127.0.0.1";
        "192.168.0.0"/24;
    }

    sub vcl_recv {
        # allow PURGE from localhost and 192.168.0...
        if (req.restarts == 0) {
            unset req.http.X-Purger;
        }
        if (req.method == "PURGE") {
            if (!client.ip ~ purgers) {
                return (synth(405, "Purging not allowed for " + client.ip));
            }
            return (purge);
        }
        #set req.backend_hint = round_robin_director.backend();
        set req.backend_hint = hash_director.backend(req.http.cookie);
    }

    sub vcl_purge {
        set req.method = "GET";
        set req.http.X-Purger = "Purged";
        return (restart);
    }

    sub vcl_deliver {
        if (req.http.X-Purger) {
            set resp.http.X-Purger = req.http.X-Purger;
        }
    }

    如下这段定义healthcheck,格式
           probe name {
                .attribute = "value";
           }

    probe healthcheck_nginx {
        .url = "/healthy.jpg";
        .timeout = 3s;
        .interval = 5s;
        .window = 5;
        .threshold = 3;
    }
    一句话，5秒监测一次，最新的5次监测中，有3次成功则判定为healthy

    实时查看健康状态
    watch -n.5 varnishadm backend.list
    watch -n.5 varnishadm debug.health
    varnishlog -g raw -i Backend_health

    相关栏位解释
    varnish-4.x <wbr>VCL之healthy <wbr>check
    varnish-4.x <wbr>VCL之healthy <wbr>check

    varnish-4.x <wbr>VCL之healthy <wbr>check

    root@config-p:~#varnishlog -g raw -i Backend_health
             0 Backend_health - nginx Still healthy 4--X-RH 5 3 5 0.000235 0.000241 HTTP/1.1 200 OK
             0 Backend_health - apache Still healthy 4--X-RH 5 3 5 0.000323 0.000378 HTTP/1.1 200 OK
             0 Backend_health - nginx Still healthy 4--X-RH 5 3 5 0.000297 0.000255 HTTP/1.1 200 OK
             0 Backend_health - apache Still healthy 4--X-RH 5 3 5 0.000324 0.000365 HTTP/1.1 200 OK
             0 Backend_health - nginx Still healthy 4--X-RH 5 3 5 0.000216 0.000245 HTTP/1.1 200 OK
             0 Backend_health - apache Still healthy ------- 4 3 5 0.000000 0.000365
             0 Backend_health - nginx Still healthy 4--X-RH 5 3 5 0.000244 0.000245 HTTP/1.1 200 OK
             0 Backend_health - apache Still healthy ------- 3 3 5 0.000000 0.000365
             0 Backend_health - nginx Still healthy 4--X-RH 5 3 5 0.000226 0.000240 HTTP/1.1 200 OK
             0 Backend_health - apache Went sick ------- 2 3 5 0.000000 0.000365
             0 Backend_health - nginx Still healthy 4--X-RH 5 3 5 0.000222 0.000236 HTTP/1.1 200 OK
             0 Backend_health - apache Still sick ------- 1 3 5 0.000000 0.000365
             0 Backend_health - nginx Still healthy 4--X-RH 5 3 5 0.000274 0.000245 HTTP/1.1 200 OK
             0 Backend_health - apache Still sick ------- 0 3 5 0.000000 0.000365
             0 Backend_health - nginx Still healthy 4--X-RH 5 3 5 0.000625 0.000340 HTTP/1.1 200 OK
             0 Backend_health - apache Still sick 4--X-RH 1 3 5 0.000936 0.000507 HTTP/1.1 200 OK
             0 Backend_health - nginx Still healthy 4--X-RH 5 3 5 0.000225 0.000311 HTTP/1.1 200 OK
             0 Backend_health - apache Still sick 4--X-RH 2 3 5 0.000793 0.000579 HTTP/1.1 200 OK
             0 Backend_health - nginx Still healthy 4--X-RH 5 3 5 0.000220 0.000288 HTTP/1.1 200 OK
             0 Backend_health - apache Back healthy 4--X-RH 3 3 5 0.000959 0.000674 HTTP/1.1 200 OK


    root@config-p:jlive#varnishadm debug.health
    Backend nginx is Healthy
    Current states  good:  5 threshold:  3 window:  5
    Average responsetime of good probes: 0.000249
    Oldest                                                    Newest
    ================================================================
    4444444444444444444444444444444444444444444444444444444444444444 Good IPv4
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Good Xmit
    RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR Good Recv
    HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH Happy
    Backend apache is Healthy
    Current states  good:  4 threshold:  3 window:  5
    Average responsetime of good probes: 0.000363
    Oldest                                                    Newest
    ================================================================
    444444444444444444444444444444444-----4444444444444444444444444- Good IPv4
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX-----XXXXXXXXXXXXXXXXXXXXXXXXX- Good Xmit
    RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR-----RRRRRRRRRRRRRRRRRRRRRRRRR- Good Recv
    HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH-----HHHHHHHHHHHHHHHHHHHHHHHHH- Happy

    root@config-p:~#varnishadm debug.health
    Backend nginx is Healthy
    Current states  good:  5 threshold:  3 window:  5
    Average responsetime of good probes: 0.000243
    Oldest                                                    Newest
    ================================================================
    4444444444444444444444444444444444444444444444444444444444444444 Good IPv4
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Good Xmit
    RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR Good Recv
    HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH Happy
    Backend apache is Sick
    Current states  good:  2 threshold:  3 window:  5
    Average responsetime of good probes: 0.000363
    Oldest                                                    Newest
    ================================================================
    4444444444444444444444444444444-----4444444444444444444444444--- Good IPv4
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX-----XXXXXXXXXXXXXXXXXXXXXXXXX--- Good Xmit
    RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR-----RRRRRRRRRRRRRRRRRRRRRRRRR--- Good Recv
    HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH-----HHHHHHHHHHHHHHHHHHHHHHHHH--- Happy
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  • 原文地址：https://www.cnblogs.com/lixuebin/p/10814200.html
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