我有一台运行 Varnish 和 nginx 的服务器。前端网站报503错误:
错误 503 服务不可用
暂停服务
上师冥想:
XID:317911182优化缓存服务器
这是的内容/etc/varnish/foo.vcl
:
backend default {
.host = "127.0.0.1";
.port = "8080";
.connect_timeout = 1s;
.first_byte_timeout = 90s;
.between_bytes_timeout = 90s;
}
varnishlog
显然没有显示任何问题:
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1486463718 1.0
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1486463721 1.0
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1486463724 1.0
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1486463727 1.0
但是,本地主机上的 8080 端口上没有运行任何服务:
server# netstat -anp | grep 8080
server# telnet localhost 8080
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
事实上,nginx 日志在尝试连接时报告了一个错误:
2017/02/07 11:51:11 [error] 2008#0: *188 connect() failed (111: Connection refused) while connecting to upstream, client: 10.2.3.4, server: _, request: "GET /mydir/ HTTP/1.1", upstream: "http://127.0.0.1:8080/mydir/", host: "myhost.example.com"
我可以检查什么来进一步解决问题?
答案1
以下几行显示正常操作 - Varnish 正在检查其缓存是否正常。这是正常现象,与后端连接无关。
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1486473078 1.0
如果后端配置了健康检查,您将看到类似以下内容:
清漆日志输出:
0 CLI - Rd ping
0 CLI - Wr 200 19 PONG 1486473075 1.0
0 Backend_health - boot.default Still sick ------- 1 3 3 0.000000 0.000000
0 Backend_health - boot.default Still sick ------- 0 3 3 0.000000 0.000000
或者
32771 Timestamp b Start: 1486473576.634500 0.000000 0.000000
32771 BereqMethod b GET
32771 BereqURL b /
32771 BereqProtocol b HTTP/1.1
32771 BereqHeader b Host: 127.0.0.1:8080
32771 BereqHeader b User-Agent: curl/7.51.0
32771 BereqHeader b Accept: */*
32771 BereqHeader b X-Forwarded-For: 127.0.0.1
32771 BereqHeader b Accept-Encoding: gzip
32771 BereqHeader b X-Varnish: 32771
32771 VCL_call b BACKEND_FETCH
32771 VCL_return b fetch
32771 FetchError b no backend connection
默认.vlc:
backend default {
.host = "127.0.0.1";
.port = "8081";
.probe = {
.url = "/status";
.timeout = 60 ms;
.interval = 10s;
.window = 3;
.threshold = 3;
}
}