使用docker-compose安装caddy:

version: '3'
services:
  caddy:
    container_name: caddy
    image: caddy:latest
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./caddy/Caddyfile:/etc/caddy/Caddyfile
      - ./caddy/wwwroot:/srv
      - ./caddy/data:/data
      - ./caddy/config:/config
    restart: unless-stopped

Caddyfile配置如下：

# 配置 HTTPS 服务，注blog为docker镜像名, 也可以是ip
peos.cn {
    reverse_proxy * blog:80 {
        header_up Host {host}
        header_up X-Real-IP {remote}
        header_up X-Forwarded-For {remote}
        header_up X-Forwarded-Proto {scheme}
    }
}

#www转无www，301跳转，反之 无www转www一样
www.peos.cn { 
    redir https://peos.cn{uri} permanent
}

#其它访问
:80 {
    reverse_proxy * blog:80 {
        header_up Host {host}
        header_up X-Real-IP {remote}
        header_up X-Forwarded-For {remote}
        header_up X-Forwarded-Proto {scheme}
    }
}