解决
Error downloading packages:
docker-compose-plugin-2.27.1-1.el7.x86_64: [Errno 256] No more mirrors to try

这个是 VMware17 虚拟机中 CentOS7 下载docker时出现的问题
不知道是因为什么，但是用下面的方法解决了，最后下载成功了

结果

启动没有报错

解决方法

1. 进入文件

sudo vi /etc/yum.repos.d/CentOS-Base.repo 

我的文件内容如下，把下面的粘贴进自己的文件

建议大家先复制自己当前的保存，虚拟机左键选中即复制

• 文件界面 摁 i 可进行修改文件
• 先摁 Esc （可以多摁几次观察），界面不显示INSERT以后就是命令模式，输入 :q! 命令是不保存修改退出；输入 :wq命令是保存当前修改并退出

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
 
[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
 
#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
 
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
 
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
baseurl=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
 

复制完以后 Esc 输入 :wq保存并退出回到命令行界面

2. 安装yum工具

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

3. 添加阿里云 Docker 源（推荐国内用户，速度更快）

sudo yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

4. 生成缓存（加速后续安装）

sudo yum makecache fast

5. 安装Docker组件

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

6. 启动和校验

# 启动Docker
sudo systemctl start docker

# 停止Docker
sudo systemctl stop docker

# 重启
systemctl restart docker

# 设置开机自启
systemctl enable docker

# 验证 Docker 版本
docker --version

# 验证 docker-compose 插件是否安装成功
docker compose version

# 执行docker ps命令，如果不报错，说明安装启动成功
docker ps

以上命令输完，就已经在虚拟机安装好dockers，校验完毕