Docker运行hello-world镜像失败或超时

docker run hello-world时超时告警

​ 跟着官方文档进行docker安装时，测试docker是否运行成功执行docker run hello-world时，效果和别人的不一样
正常情况：

我们的：

1. Unable to find image 'hello-world:latest' locally
2. latest: Pulling from library/hello-world
3. c1ec31eb5944: Retrying in 10 seconds
4. docker: error pulling image configuration: download failed after attempts=6: dial tcp 128.242.245.93:443: connect: connection refused.
5. See 'docker run --help'.

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  原因：就是我们的镜像源不可，需要更换镜像源
  但是我们就算知道原因，去找度娘会发现大部门都是说更换阿里的镜像源，但是我们实行之后并没有作用
   常规方案没作用

1. #针对Docker客户端版本大于 1.10.0 的用户
2. #您可以通过修改daemon配置文件/etc/docker/daemon.json来使用加速器
4. sudo mkdir -p /etc/docker
5. sudo tee /etc/docker/daemon.json <<-'EOF'
6. {
7.   "registry-mirrors": ["https://5nkcn10r.mirror.aliyuncs.com"]
8. }
9. EOF
10. sudo systemctl daemon-reload
11. sudo systemctl restart docker

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2.1、解决方案
配置加速地址：设置registry mirror

1. sudo mkdir -p /etc/docker
2. sudo tee /etc/docker/daemon.json <<-'EOF'
3. {
4.     "registry-mirrors": [
5.         "https://do.nark.eu.org",
6.         "https://dc.j8.work",
7.         "https://docker.m.daocloud.io",
8.         "https://dockerproxy.com",
9.         "https://docker.mirrors.ustc.edu.cn",
10.         "https://docker.nju.edu.cn"
11.     ]
12. }
13. EOF
14. sudo systemctl daemon-reload
15. sudo systemctl restart docker
16. systemctl status docker

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重启完docker之后查抄registry mirror刚刚配置的加速地址是否成功

1. [root@wzy1303 docker]# docker info
2. Client: Docker Engine - Community
3. Version:    26.1.4
4. Context:    default
5. Debug Mode: false
6. Plugins:
7.   buildx: Docker Buildx (Docker Inc.)
8.     Version:  v0.14.1
9.     Path:     /usr/libexec/docker/cli-plugins/docker-buildx
10.   compose: Docker Compose (Docker Inc.)
11.     Version:  v2.27.1
12.     Path:     /usr/libexec/docker/cli-plugins/docker-compose
14. Server:
15. Containers: 1
16.   Running: 0
17.   Paused: 0
18.   Stopped: 1
19. Images: 1
20. Server Version: 26.1.4
21. Storage Driver: overlay2
22.   Backing Filesystem: xfs
23.   Supports d_type: true
24.   Using metacopy: false
25.   Native Overlay Diff: true
26.   userxattr: false
27. Logging Driver: json-file
28. Cgroup Driver: cgroupfs
29. Cgroup Version: 1
30. Plugins:
31.   Volume: local
32.   Network: bridge host ipvlan macvlan null overlay
33.   Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
34. Swarm: inactive
35. Runtimes: io.containerd.runc.v2 runc
36. Default Runtime: runc
37. Init Binary: docker-init
38. containerd version: d2d58213f83a351ca8f528a95fbd145f5654e957
39. runc version: v1.1.12-0-g51d5e94
40. init version: de40ad0
41. Security Options:
42.   seccomp
43.    Profile: builtin
44. Kernel Version: 3.10.0-1160.119.1.el7.x86_64
45. Operating System: CentOS Linux 7 (Core)
46. OSType: linux
47. Architecture: x86_64
48. CPUs: 8
49. Total Memory: 2.761GiB
50. Name: wzy1303
51. ID: 74efae68-ef43-45a9-b547-ffa2c3805423
52. Docker Root Dir: /var/lib/docker
53. Debug Mode: false
54. Username: inkling1303
55. Experimental: false
56. Insecure Registries:
57.   127.0.0.0/8
58. Registry Mirrors:
59.   https://do.nark.eu.org/
60.   https://dc.j8.work/
61.   https://docker.m.daocloud.io/
62.   https://dockerproxy.com/
63.   https://docker.mirrors.ustc.edu.cn/
64.   https://docker.nju.edu.cn/
65. Live Restore Enabled: false

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可以看到我们已经配置成功：

运行docker run hello-world,成功运行

1. [root@wzy1303 docker]# docker run hello-world
2. Unable to find image 'hello-world:latest' locally
3. latest: Pulling from library/hello-world
4. c1ec31eb5944: Pull complete
5. Digest: sha256:53cc4d415d839c98be39331c948609b659ed725170ad2ca8eb36951288f81b75
6. Status: Downloaded newer image for hello-world:latest
8. Hello from Docker!
9. This message shows that your installation appears to be working correctly.
11. To generate this message, Docker took the following steps:
12. 1. The Docker client contacted the Docker daemon.
13. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
14.     (amd64)
15. 3. The Docker daemon created a new container from that image which runs the
16.     executable that produces the output you are currently reading.
17. 4. The Docker daemon streamed that output to the Docker client, which sent it
18.     to your terminal.
20. To try something more ambitious, you can run an Ubuntu container with:
21. $ docker run -it ubuntu bash
23. Share images, automate workflows, and more with a free Docker ID:
24. https://hub.docker.com/
26. For more examples and ideas, visit:
27. https://docs.docker.com/get-started/
29. #查看是否成功拉取hello-world镜像
30. [root@wzy1303 docker]# docker images
31. REPOSITORY    TAG       IMAGE ID       CREATED         SIZE
32. hello-world   latest    d2c94e258dcb   15 months ago   13.3kB
33. [root@wzy1303 docker]# docker images -a
34. REPOSITORY    TAG       IMAGE ID       CREATED         SIZE
35. hello-world   latest    d2c94e258dcb   15 months ago   13.3kB
36. [root@wzy1303 docker]# docker images -aq
37. d2c94e258dcb

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