错误提示：

error pulling image configuration: download failed after attempts=6: dial tcp 67.228.102.32:443: connect: connection refused
 

latest: Pulling from freeradius/freeradius-server
a8b1c5f80c2d: Retrying in 1 second 
37ffe8884f09: Retrying in 1 second 
d27a0b429208: Retrying in 1 second 
0c655c7a2c3d: Waiting 
0cc468852d4f: Waiting 
error pulling image configuration: download failed after attempts=6: dial tcp 67.228.102.32:443: connect: connection refused
 

解决方法：

设置国内镜像源，复制下面的命令执行

sudo mkdir -p /etc/docker

sudo tee /etc/docker/daemon.json <<-'EOF'
 
 {
  "registry-mirrors": [
          "https://ox288s4f.mirror.aliyuncs.com",
          "https://registry.docker-cn.com",
          "http://hub-mirror.c.163.com",
          "https://mirror.ccs.tencentyun.com"
  ]
}
 
EOF

重启docker

sudo systemctl daemon-reload
sudo systemctl restart docker
 
或者
 
sudo service docker restart

测试拉取：

6e0aa5e7af40: Pull complete 
d47239a868b3: Pull complete 
49cbb10cca85: Pull complete 
f051142e9713: Pull complete 
75f30d55de42: Pull complete 
fb0580c8b82f: Pull complete 
Digest: sha256:a3192c706a9897147f617307869de6deb7fead67b8aa7b9e7d053bcb27ef6adc
Status: Downloaded newer image for freeradius/freeradius-server:latest
docker.io/freeradius/freeradius-server:latest