如何彻底删除NextCloud Docker相关内容以实现全新重装？

你之前的清理操作没有触达Docker绑定挂载的本地目录：你的docker-compose.yml中NextCloud应用的配置、数据、主题等文件都通过./app/开头的路径直接挂载到了宿主机本地，SQLite数据库文件、已经写入的数据库配置也存在这些目录中。docker system prune命令仅会清理未被使用的Docker托管卷、镜像、容器资源，不会修改或删除宿主机上的绑定挂载目录内容，因此重启后始终加载旧的SQLite实例。

• 首先进入docker-compose.yml所在的目录，执行以下命令停止所有服务并删除关联的Docker托管命名卷：

  docker compose down -v
  

• 删除宿主机上的本地挂载目录，彻底清除所有旧配置、旧数据：

  rm -rf ./app ./proxy
  

• （可选）清理残留的相关镜像，避免缓存导致的异常：

  docker image rm nextcloud:latest mariadb jwilder/nginx-proxy:alpine jrcs/letsencrypt-nginx-proxy-companion
  

• 确认你的docker-compose.yml配置已修改正确（包括域名、邮箱、MariaDB参数等），重新启动服务：

  docker compose up -d
  

服务启动完成后访问你的NextCloud域名，会进入全新的初始化界面：

• 数据库选择MySQL/MariaDB
• 数据库用户填nextcloud，密码填你配置的MYSQL_PASSWORD值，数据库名填nextcloud
• 数据库地址填db:3306，完成初始化即可使用MariaDB作为数据库

version: '3' 

services:

  proxy:
    image: jwilder/nginx-proxy:alpine
    labels:
      - "com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy=true"
    container_name: nextcloud-proxy
    networks:
      - nextcloud_network
    ports:
      - 80:80
      - 443:443
    volumes:
      - ./proxy/conf.d:/etc/nginx/conf.d:rw
      - ./proxy/vhost.d:/etc/nginx/vhost.d:rw
      - ./proxy/html:/usr/share/nginx/html:rw
      - ./proxy/certs:/etc/nginx/certs:ro
      - /etc/localtime:/etc/localtime:ro
      - /var/run/docker.sock:/tmp/docker.sock:ro
    restart: unless-stopped
  
  letsencrypt:
    image: jrcs/letsencrypt-nginx-proxy_companion
    container_name: nextcloud-letsencrypt
    depends_on:
      - proxy
    networks:
      - nextcloud_network
    volumes:
      - ./proxy/certs:/etc/nginx/certs:rw
      - ./proxy/vhost.d:/etc/nginx/vhost.d:rw
      - ./proxy/html:/usr/share/nginx/html:rw
      - /etc/localtime:/etc/localtime:ro
      - /var/run/docker.sock:/var/run/docker.sock:ro
    restart: unless-stopped

  db:
    image: mariadb
    container_name: nextcloud-mariadb
    networks:
      - nextcloud_network
    volumes:
      - db:/var/lib/mysql
      - /etc/localtime:/etc/localtime:ro
    environment:
      - MYSQL_ROOT_PASSWORD=toor
      - MYSQL_PASSWORD=mysql
      - MYSQL_DATABASE=nextcloud
      - MYSQL_USER=nextcloud
    restart: unless-stopped
    command: ['--innodb_read_only_compressed=OFF'] 
  
  app:
    image: nextcloud:latest
    container_name: nextcloud-app
    networks:
      - nextcloud_network
    depends_on:
      - letsencrypt
      - proxy
      - db
    volumes:
      - nextcloud:/var/www/html
      - ./app/config:/var/www/html/config
      - ./app/custom_apps:/var/www/html/custom_apps
      - ./app/data:/var/www/html/data
      - ./app/themes:/var/www/html/themes
      - /etc/localtime:/etc/localtime:ro
    environment:
      - VIRTUAL_HOST=your-subdomain.duckdns.org
      - LETSENCRYPT_HOST=your-subdomain.duckdns.org
      - LETSENCRYPT_EMAIL=you@youremail.com
    restart: unless-stopped

volumes:
  nextcloud:
  db:

networks:
  nextcloud_network:

内容的提问来源于stack exchange，提问作者JayCo741