安装docker报错

执行docker安装命令：sudo yum install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin，出现如下错误

更换yum源

[root@localhost yum.repos.d]# sudo mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
[root@localhost yum.repos.d]# ll
total 40
-rw-r--r--. 1 root root 1664 Apr 28  2018 CentOS-Base.repo.backup
-rw-r--r--. 1 root root 1309 Apr 28  2018 CentOS-CR.repo
-rw-r--r--. 1 root root  649 Apr 28  2018 CentOS-Debuginfo.repo
-rw-r--r--. 1 root root  314 Apr 28  2018 CentOS-fasttrack.repo
-rw-r--r--. 1 root root  630 Apr 28  2018 CentOS-Media.repo
-rw-r--r--. 1 root root 1331 Apr 28  2018 CentOS-Sources.repo
-rw-r--r--. 1 root root 4768 Apr 28  2018 CentOS-Vault.repo
-rw-r--r--. 1 root root 2294 Feb  6 23:55 docker-ce.repo
-rw-r--r--. 1 root root 2081 Feb  6 23:55 docker-ce.repo.bk
[root@localhost yum.repos.d]# sudo curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2523  100  2523    0     0   4448      0 --:--:-- --:--:-- --:--:--  4441
[root@localhost yum.repos.d]# sudo yum clean all
Loaded plugins: fastestmirror, langpacks
Cleaning repos: base docker-ce-stable extras updates
Cleaning up everything
Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos
Cleaning up list of fastest mirrors
[root@localhost yum.repos.d]# sudo yum makecache
Loaded plugins: fastestmirror, langpacks
Determining fastest mirrors
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
base                                                                                                                                 | 3.6 kB  00:00:00
docker-ce-stable                                                                                                                     | 3.5 kB  00:00:00
extras                                                                                                                               | 2.9 kB  00:00:00
updates                                                                                                                              | 2.9 kB  00:00:00
(1/14): docker-ce-stable/x86_64/filelists_db                                                                                         |  66 kB  00:00:00
(2/14): docker-ce-stable/x86_64/updateinfo                                                                                           |   55 B  00:00:00
(3/14): base/7/x86_64/group_gz                                                                                                       | 153 kB  00:00:00
(4/14): docker-ce-stable/x86_64/primary_db                                                                                           | 152 kB  00:00:00
(5/14): base/7/x86_64/other_db                                                                                                       | 2.6 MB  00:00:00
(6/14): extras/7/x86_64/primary_db                                                                                                   | 253 kB  00:00:00
(7/14): extras/7/x86_64/other_db                                                                                                     | 154 kB  00:00:00
(8/14): extras/7/x86_64/filelists_db                                                                                                 | 305 kB  00:00:00
(9/14): docker-ce-stable/x86_64/other_db                                                                                             | 145 kB  00:00:00
(10/14): updates/7/x86_64/filelists_db                                                                                               |  15 MB  00:00:01
(11/14): updates/7/x86_64/other_db                                                                                                   | 1.6 MB  00:00:00
(12/14): updates/7/x86_64/primary_db                                                                                                 |  27 MB  00:00:02
base/7/x86_64/primary_db       FAILED
http://mirrors.cloud.aliyuncs.com/centos/7/os/x86_64/repodata/6d0c3a488c282fe537794b5946b01e28c7f44db79097bb06826e1c0c88bad5ef-primary.sqlite.bz2: [Errno 12] Timeout on http://mirrors.cloud.aliyuncs.com/centos/7/os/x86_64/repodata/6d0c3a488c282fe537794b5946b01e28c7f44db79097bb06826e1c0c88bad5ef-primary.sqlite.bz2: (28, 'Connection timed out after 30003 milliseconds')
Trying other mirror.
base/7/x86_64/filelists_db     FAILED
http://mirrors.aliyuncs.com/centos/7/os/x86_64/repodata/d6d94c7d406fe7ad4902a97104b39a0d8299451832a97f31d71653ba982c955b-filelists.sqlite.bz2: [Errno 12] Timeout on http://mirrors.aliyuncs.com/centos/7/os/x86_64/repodata/d6d94c7d406fe7ad4902a97104b39a0d8299451832a97f31d71653ba982c955b-filelists.sqlite.bz2: (28, 'Connection timed out after 30001 milliseconds')
Trying other mirror.
(13/14): base/7/x86_64/primary_db                                                                                                    | 6.1 MB  00:00:00
(14/14): base/7/x86_64/filelists_db                                                                                                  | 7.2 MB  00:00:00
Metadata Cache Created

安装docker更换为国内镜像源

由于CentOS 7的官方支持已经结束，建议更换为国内的镜像源，以确保能够正常下载和安装Docker。以下是使用阿里云镜像源的步骤：

1.1 安装必要的工具

bash复制

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

1.2 添加Docker的阿里云镜像源

bash复制

sudo yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sudo sed -i 's+download.docker.com+mirrors.aliyun.com/docker-ce+' /etc/yum.repos.d/docker-ce.repo

1.3 更新YUM缓存

bash复制

sudo yum makecache fast

2. 安装Docker

使用以下命令安装Docker：

bash复制

sudo yum install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

3. 启动Docker服务

安装完成后，启动Docker服务并设置为开机自启：

bash复制

sudo systemctl start docker
sudo systemctl enable docker

4. 验证Docker安装

使用以下命令验证Docker是否安装成功：

bash复制

docker --version
docker info