docker  缺少签名密钥

<font color=red>问题：

[root@web ~]# docker pull nginx
Using default tag: latest
Trying to pull repository docker.io/library/nginx ... 
missing signature key

提示：缺少签名密钥

<font color=bleen>解决方法

1.在其他设备上运行查看是否可以垃取；

2.查看docker的版本

[root@web ~]# docker   version
Client:
 Version:         1.13.1
 API version:     1.26
 Package version: docker-1.13.1-210.git7d71120.el7.centos.x86_64
 Go version:      go1.10.3
 Git commit:      7d71120/1.13.1
 Built:           Wed Mar 20 16:04:34 2024
 OS/Arch:         linux/amd64

Server:
 Version:         1.13.1
 API version:     1.26 (minimum version 1.12)
 Package version: docker-1.13.1-210.git7d71120.el7.centos.x86_64
 Go version:      go1.10.3
 Git commit:      7d71120/1.13.1
 Built:           Wed Mar 20 16:04:34 2024
 OS/Arch:         linux/amd64
 Experimental:    false

3.移除docker

sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine

4.更新docker

[root@web ~]# sudo yum install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

5.查看更新之后的版本

[root@web ~]# docker version
Client: Docker Engine - Community
 Version:           26.0.2
 API version:       1.45
 Go version:        go1.21.9
 Git commit:        3c863ff
 Built:             Thu Apr 18 16:30:00 2024
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          26.0.2
  API version:      1.45 (minimum version 1.24)
  Go version:       go1.21.9
  Git commit:       7cef0d9
  Built:            Thu Apr 18 16:28:58 2024
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.31
  GitCommit:        e377cd56a71523140ca6ae87e30244719194a521
 runc:
  Version:          1.1.12
  GitCommit:        v1.1.12-0-g51d5e94
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

6.再次垃取镜像测试

[root@web ~]# docker pull nginx 
Using default tag: latest
latest: Pulling from library/nginx
13808c22b207: Downloading [>                                                  ]  294.9kB/29.13MB
c46d32988911: Downloading [>                                                  ]    426kB/41.79MB
b9d060e68bbc: Download complete 
c028eb95b065: Download complete 
e74ab6743f66: Pulling fs layer 
4a666f159bd0: Waiting 
297a65ba6f04: Waiting

可以垃取了，原因就是应用docker的版本低的原因