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 CurrentDload 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 lvm21.2 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.repo1.3 更新YUM缓存
bash复制
sudo yum makecache fast2. 安装Docker
使用以下命令安装Docker：
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sudo yum install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin3. 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 docker4. 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
