Update registry_v2_cmd.md

Author: xueqing

docker/registry_v2_cmd.md

@@ -8,14 +8,23 @@ docker pull registry_ip:registry_port/image_name:image_tag
 # 搜索镜像：registry v2 不支持 search 命令，会报错 Error response from daemon: Unexpected status code 404”
 ##  需要通过 REST API 查询
 ### 1. 列出所有镜像仓库
+curl http://registry_ip:registry_port/v2/_catalog
 curl -X GET http://registry_ip:registry_port/v2/_catalog
 ### 2. 列出指定镜像的所有标签
+curl http://registry_ip:registry_port/v2/image_name/tags/list
 curl -X GET http://registry_ip:registry_port/v2/image_name/tags/list
 # 删除镜像：需要先查到指定标签镜像的 digest(sha256 校验和)，再根据 digest 删除镜像
 ### 3. 获取指定标签镜像的 digest(sha256 校验和)，查看 Docker-Content-Digest 字段内容
-curl --header "Accept: application/vnd.docker.distribution.manifest.v2+json" -I -X GET http://registry_ip:registry_port/v2/image_name/manifests/<tag>
+curl -H "Accept: application/vnd.docker.distribution.manifest.v2+json" -I http://registry_ip:registry_port/v2/image_name/manifests/<tag>
+curl -H "Accept: application/vnd.docker.distribution.manifest.v2+json" -I -X GET http://registry_ip:registry_port/v2/image_name/manifests/<tag>
 ### 4. 根据 digest 删除镜像
 curl -X DELETE http://registry_ip:registry_port/v2/image_name/manifests/digest_hash
 # 如果报错 {"errors":[{"code":"UNSUPPORTED","message":"The operation is unsupported."}]}，
 # 需要更改 registry 容器内的 / etc/docker/registry/config.yml 文件，修改 storage.delete.enabled 为 true
+## 修改方法：docker cp registry:/etc/docker/registry/config.yml .
+## 修改之后拷贝回镜像：docker cp config.yml registry:/etc/docker/registry/config.yml
+## 然后重启：docker restart registry
+## 再次执行命令 4
+# 垃圾回收
+docker exec registry bin/registry garbage-collect /etc/docker/registry/config.yml
 ```