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