问题现象

我之前在docker里部署的容器，今天突然访问不了了，一开始我以为是容器的问题，将容器restart，销毁重建，都没有解决。
最后准备重启docker service，在重启之前，看了一眼docker的状态：

1. ck94 ~]# systemctl status docker
   
2. ● docker.service - Docker Application Container Engine
   
3.    Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   
4.    Active: active (running) since Tue 2023-04-25 10:06:23 CST; 1 months 3 days ago
   
5.      Docs: https://docs.docker.com
   
6. Main PID: 2615 (dockerd)
   
7.     Tasks: 172
   
8.    Memory: 8.3G
   
9.    CGroup: /system.slice/docker.service
   
10.            ├─ 2615 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
    
11.            ├─ 5610 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 55433 -container-ip 172.17.0.3 -container-port 5432
    
12.            ├─ 5627 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 55433 -container-ip 172.17.0.3 -container-port 5432
    
13.            ├─ 5671 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 3000 -container-ip 172.17.0.4 -container-port 3000
    
14.            ├─ 5698 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 3000 -container-ip 172.17.0.4 -container-port 3000
    
15.            ├─21981 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 9200 -container-ip 172.20.0.2 -container-port 9200
    
16.            ├─21994 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 9200 -container-ip 172.20.0.2 -container-port 9200
    
17.            ├─23558 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 10086 -container-ip 172.20.0.3 -container-port 9000
    
18.            ├─23575 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 10086 -container-ip 172.20.0.3 -container-port 9000
    
19.            ├─23624 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 38080 -container-ip 172.20.0.4 -container-port 8080
    
20.            ├─23640 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 38080 -container-ip 172.20.0.4 -container-port 8080
    
21.            ├─26535 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 49001 -container-ip 172.17.0.2 -container-port 9001
    
22.            ├─26552 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 49001 -container-ip 172.17.0.2 -container-port 9001
    
23.            ├─26602 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 49000 -container-ip 172.17.0.2 -container-port 9000
    
24.            ├─26620 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 49000 -container-ip 172.17.0.2 -container-port 9000
    
25.            ├─39170 /usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 5601 -container-ip 172.20.0.5 -container-port 5601
    
26.            └─39182 /usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 5601 -container-ip 172.20.0.5 -container-port 5601
    
27. 
    
28. May 29 09:24:38 ck94 dockerd[2615]: time="2023-05-29T09:24:38.161269040+08:00" level=warning msg="[resolver] failed to read from DNS server: 223.6.6.6:53, query: ;elasticse... i/o timeout"
    
29. May 29 09:26:22 ck94 dockerd[2615]: time="2023-05-29T09:26:22.679628216+08:00" level=warning msg="[resolver] failed to read from DNS server: 223.6.6.6:53, query: ;elasticse... i/o timeout"
    
30. May 29 09:26:27 ck94 dockerd[2615]: time="2023-05-29T09:26:27.683446445+08:00" level=warning msg="[resolver] failed to read from DNS server: 223.6.6.6:53, query: ;elasticse... i/o timeout"
    
31. May 29 09:27:38 ck94 dockerd[2615]: time="2023-05-29T09:27:38.328922576+08:00" level=warning msg="ShouldRestart failed, container will not be restarted" container=4af5eb860cbfea8961372e...
    
32. May 29 09:34:18 ck94 dockerd[2615]: time="2023-05-29T09:34:18.236630475+08:00" level=warning msg="[resolver] failed to read from DNS server: 223.6.6.6:53, query: ;elasticse... i/o timeout"
    
33. May 29 09:35:02 ck94 dockerd[2615]: time="2023-05-29T09:35:02.949012103+08:00" level=warning msg="ShouldRestart failed, container will not be restarted" container=9969a986040d0f91bc80d9...
    
34. May 29 09:36:23 ck94 dockerd[2615]: time="2023-05-29T09:36:23.261658623+08:00" level=warning msg="[resolver] failed to read from DNS server: 223.6.6.6:53, query: ;elasticse... i/o timeout"
    
35. May 29 09:37:48 ck94 dockerd[2615]: time="2023-05-29T09:37:48.429139761+08:00" level=warning msg="[resolver] failed to read from DNS server: 223.6.6.6:53, query: ;elasticse... i/o timeout"
    
36. May 29 09:39:50 ck94 dockerd[2615]: time="2023-05-29T09:39:50.051518136+08:00" level=warning msg="[resolver] failed to read from DNS server: 223.6.6.6:53, query: ;elasticse... i/o timeout"
    
37. May 29 09:43:18 ck94 dockerd[2615]: time="2023-05-29T09:43:18.733473159+08:00" level=warning msg="[resolver] failed to read from DNS server: 223.6.6.6:53, query: ;elasticse... i/o timeout"
    
38. Hint: Some lines were ellipsized, use -l to show in full.

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里面报大量的DNS解析错误。
我尝试在不同机器上curl该容器的url，在本机执行：

1. ck94 ~]# curl http://192.168.101.94:49001/browser
   
2. <!doctype html><html lang="en"><head><meta charset="utf-8"/><base href="/" rel="external nofollow" /><meta content="width=device-width,initial-scale=1" name="viewport"/><meta content="#081C42" media="(prefers-color-scheme: light)" name="theme-color"/><meta content="#081C42" media="(prefers-color-scheme: dark)" name="theme-color"/><meta content="MinIO Console" name="description"/><meta name="minio-license" content="agpl" /><link href="./styles/root-styles.css" rel="external nofollow"  rel="stylesheet"/><link href="./apple-icon-180x180.png" rel="external nofollow"  rel="apple-touch-icon" sizes="180x180"/><link href="./favicon-32x32.png" rel="external nofollow"  rel="icon" sizes="32x32" type="image/png"/><link href="./favicon-96x96.png" rel="external nofollow"  rel="icon" sizes="96x96" type="image/png"/><link href="./favicon-16x16.png" rel="external nofollow"  rel="icon" sizes="16x16" type="image/png"/><link href="./manifest.json" rel="external nofollow"  rel="manifest"/><link color="#3a4e54" href="./safari-pinned-tab.svg" rel="external nofollow"  rel="mask-icon"/><title>MinIO Console</title><script defer="defer" src="./static/js/main.5efdfa93.js"></script><link href="./static/css/main.57e739f5.css" rel="external nofollow"  rel="stylesheet"></head><body><noscript>You need to enable JavaScript to run this app.</noscript><div id="root"><div id="preload"><img src="./images/background.svg"/> <img src="./images/background-wave-orig2.svg"/></div><div id="loader-block"><img src="./Loader.svg"/></div></div></body></html>

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是没有问题的。
我在其他机器上执行：

1. chenyanchang@chenyanchangdeMacBook-Pro ~ % curl http://192.168.101.94:49001/browser
   
2. curl: (7) Failed to connect to 192.168.101.94 port 49001: Operation timed out

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解决方案

重启docker服务，重启docker0网卡：

1. service docker stop
   
2. ip link set dev docker0 down
   
3. ip link set dev docker0 up
   
4. service docker start

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再次查看， 问题解决：

总结

以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。

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