1. 下载 Registry 镜像 

 [root@docker ~]# docker pull registry

#可以查看开放的端口，需要把端口暴露出来

[root@docker ~]# docker history registry:latest 

[root@docker ~]# docker run -d -p 5000:5000 --restart=always registry
9f389c98fbd2163fb6487a5bfd2358751eb4ecb07eb47f463ae76f12b117361c
[root@docker ~]# docker ps
CONTAINER ID   IMAGE      COMMAND                  CREATED          STATUS          PORTS                                       NAMES
9f389c98fbd2   registry   "/entrypoint.sh /etc…"   14 seconds ago   Up 12 seconds   0.0.0.0:5000->5000/tcp, :::5000->5000/tcp   hardcore_saha

#推送push   #把当前镜像 nginx:v2 推送到 5000 端口

[root@docker ~]# docker tag nginx:v2 172.25.254.5:5000/nginx.v3

[root@docker ~]# docker push 172.25.254.5:5000/nginx.v3
Using default tag: latest
The push refers to repository [172.25.254.5:5000/nginx.v3]
Get "https://172.25.254.5:5000/v2/": http: server gave HTTP response to HTTPS client

## 默认用 https 的方式：得做认证
[root@docker ~]# 

#也可以不用https，而用http的方式，必须得配置非加密端口信息。/etc/docker/daemon.json

[root@docker ~]# vim /etc/docker/daemon.json 
[root@docker ~]# cat /etc/docker/daemon.json 
{
  "insecure-registries" : ["http://172.25.254.5:5000"]
}

[root@docker ~]# systemctl restart docker
[root@docker ~]# docker push 172.25.254.5:5000/nginx.v3
Using default tag: latest
The push refers to repository [172.25.254.5:5000/nginx.v3]
54a2c5fcea1c: Pushed 
a8df99e45168: Pushed 
174f56854903: Pushed 
latest: digest: sha256:2d45824da0f28c4087c7a2c009cc4dba14efc637fdd8bef91fd49a1dcbda8b8c size: 947

## 推上去的数据在哪？

[root@docker ~]# docker ps
CONTAINER ID   IMAGE      COMMAND                  CREATED          STATUS         PORTS                                       NAMES
9f389c98fbd2   registry   "/entrypoint.sh /etc…"   13 minutes ago   Up 4 minutes   0.0.0.0:5000->5000/tcp, :::5000->5000/tcp   hardcore_saha
[root@docker ~]# docker inspect hardcore_saha 

真机中位于：

# 最终数据位于容器的：

# 进去真机中的路径下看看，有 nginx:v3

[root@docker ~]# cd /var/lib/docker/volumes/fbc4139d10af9999ee19f7856fb7b5d187337af25eb9c927ef0e99eff304f0f0/_data
[root@docker _data]# ls
docker
[root@docker _data]# cd docker/
[root@docker docker]# cd registry/
[root@docker registry]# ls
v2
[root@docker registry]# cd v2/
[root@docker v2]# ls
blobs  repositories
[root@docker v2]# cd repositories/
[root@docker repositories]# l
bash: l: command not found...
[root@docker repositories]# ls
nginx.v3

[root@docker ~]# curl 172.25.254.5:5000/v2/_catalog
{"repositories":["nginx.v3"]}

# 再推一个试试：

[root@docker ~]# docker tag busybox:latest 172.25.254.5:5000/busybox:xixi
[root@docker ~]# docker push 172.25.254.5:5000/busybox:xixi 
The push refers to repository [172.25.254.5:5000/busybox]
d51af96cf93e: Pushed 
xixi: digest: sha256:28e01ab32c9dbcbaae96cf0d5b472f22e231d9e603811857b295e61197e40a9b size: 527