Docker系列-5.分发镜像

Docker系列-5.分发镜像

镜像的管理分为手工分发和docker-hub或者Registry仓库两种方式

手工分发镜像

使用docker savedocker load可以在没有Registry的情况下实现image的线下分发和迁移

[root@localhost ~]# docker save ubuntu:latest -o ubuntu:tatest.tar
[root@localhost ~]# docker save ubuntu:latest | gzip > ubuntu:tatest.tgz

[root@localhost ~]# ls -lh
-rw-------. 1 root root  73M Aug  2 12:58 ubuntu:tatest.tar
-rw-r--r--. 1 root root  27M Aug  2 12:59 ubuntu:tatest.tgz

[root@localhost ~]# docker save redis:4.0.14_man | gzip >  redis:4.0.14_man.tgz         

[root@localhost ~]# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
ubuntu              update              3c7832c9920b        3 hours ago         96.4MB
ubuntu              latest              1e4467b07108        9 days ago          73.9MB
httpd               latest              9d2a0c6e5b57        10 days ago         166MB
nginx               latest              8cf1bfb43ff5        11 days ago         132MB
centos              latest              831691599b88        6 weeks ago         215MB
hello-world         latest              bf756fb1ae65        7 months ago        13.3kB

[root@localhost ~]# docker load -i redis:4.0.14_man.tgz
4014348e492a: Loading layer [==================================================>]  173.8MB/173.8MB
f3aafaca0eb9: Loading layer [==================================================>]   7.69MB/7.69MB
d0549792a5c2: Loading layer [==================================================>]  103.1MB/103.1MB
bc8ef3880d58: Loading layer [==================================================>]  3.584kB/3.584kB
Loaded image: redis:4.0.14_man

简易Registry镜像仓库

Registry用于保存 Docker 镜像,包括镜像的层次结构和元数据,利用它可以方便的实现镜像的下载、上传与修改。一般来说仓库有Docker Hub主仓库、公有云Registry,私有云Registry。

公有云Registry

Docker Hub是默认的Docker Registry。 Docker Hub 允许任何人在线托管自己的镜像。

另外可以在/etc/docker/daemon.json 中加入更多的其他的国内Registry镜像,一般公有云的Registry都是可以支持匿名Pull出镜像的。

自建私有Registry

docker-registry历经2代,registry1是python语言写的,而现在registry2版本即docker-distribution更加安全和快速,并且是用go语言写的,docker1.6及其以上版本已经不再支持老的Registry。

两种方式安装和部署Registry,第一种是用yum安装docker-distribution系统服务的方式

1 使用 yum 安装docker-distribution

2 以容器方式安装registry

安装

用yum安装docker-distribution这种方式并不是docker官方文档提到的方式,安装后通过systemctl来管理仓库服务。

1 主机规划

IP 虚拟机实例 Hostname 配置 OS 软件
192.168.56.107 registry-docker-distribution registry-docker-distribution docker-distribution.x86_64 0:2.6.2

2 安装docker-distribution

[root@localhost ~]# yum info docker-distribution
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.huaweicloud.com
Available Packages
Name        : docker-distribution
Arch        : x86_64
Version     : 2.6.2
Release     : 2.git48294d9.el7
Size        : 3.5 M
Repo        : extras/7/x86_64
Summary     : Docker toolset to pack, ship, store, and deliver content
URL         : https://github.com/docker/distribution
License     : ASL 2.0
Description : Docker toolset to pack, ship, store, and deliver content

[root@localhost ~]# yum install -y docker-distribution
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.huaweicloud.com
Resolving Dependencies
--> Running transaction check
---> Package docker-distribution.x86_64 0:2.6.2-2.git48294d9.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

====================================================================================================================================================
 Package                                  Arch                        Version                                     Repository                   Size
====================================================================================================================================================
Installing:
 docker-distribution                      x86_64                      2.6.2-2.git48294d9.el7                      extras                      3.5 M

Transaction Summary
====================================================================================================================================================
Install  1 Package

Total download size: 3.5 M
Installed size: 12 M
Downloading packages:
docker-distribution-2.6.2-2.git48294d9.el7.x86_64.rpm                                                                        | 3.5 MB  00:00:01     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
  Installing : docker-distribution-2.6.2-2.git48294d9.el7.x86_64                                                                                1/1 
  Verifying  : docker-distribution-2.6.2-2.git48294d9.el7.x86_64                                                                                1/1 

Installed:
  docker-distribution.x86_64 0:2.6.2-2.git48294d9.el7                                                                                               

Complete!

3 设置registry

  [root@registry-docker-distribution ~]# vi /etc/docker-distribution/registry/config.yml
  version: 0.1
  log:
    fields:
      service: registry
  storage:
      cache:
          layerinfo: inmemory
      filesystem:
          rootdirectory: /var/lib/registry
  http:
      addr: :5000

rootdirectory: /var/lib/registry ---镜像仓库的绝对路径

addr: :5000 ----服务绑定5000端口

4 启动服务

[root@registry-docker-distribution ~]# systemctl enable docker-distribution
Created symlink from /etc/systemd/system/multi-user.target.wants/docker-distribution.service to /usr/lib/systemd/system/docker-distribution.service.

[root@registry-docker-distribution ~]# systemctl list-unit-files  |grep docker
docker-distribution.service                   enabled 

[root@registry-docker-distribution ~]# systemctl start docker-distribution 

[root@registry-docker-distribution ~]# systemctl status docker-distribution
● docker-distribution.service - v2 Registry server for Docker
   Loaded: loaded (/usr/lib/systemd/system/docker-distribution.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat 2020-08-22 12:34:20 EDT; 7s ago
 Main PID: 4485 (registry) 
   CGroup: /system.slice/docker-distribution.service
           └─4485 /usr/bin/registry serve /etc/docker-distribution/registry/config.yml

Aug 22 12:34:20 registry-docker-distribution systemd[1]: Started v2 Registry server for Docker.
Aug 22 12:34:20 registry-docker-distribution registry[4485]: time="2020-08-22T12:34:20-04:00" level=warning msg="No HTTP secret provided - generated random secret. This may cause proble...
Aug 22 12:34:20 registry-docker-distribution registry[4485]: time="2020-08-22T12:34:20-04:00" level=info msg="redis not configured" go.version=go1.9.4 instance.id=590a593d-ca7...2+unknown"
Aug 22 12:34:20 registry-docker-distribution registry[4485]: time="2020-08-22T12:34:20-04:00" level=info msg="using inmemory blob descriptor cache" go.version=go1.9.4 instance...2+unknown"
Aug 22 12:34:20 registry-docker-distribution registry[4485]: time="2020-08-22T12:34:20-04:00" level=info msg="listening on [::]:5000" go.version=go1.9.4 instance.id=590a593d-c...2+unknown"
Aug 22 12:34:20 registry-docker-distribution registry[4485]: time="2020-08-22T12:34:20-04:00" level=info msg="Starting upload purge in 18m0s" go.version=go1.9.4 instance.id=59...2+unknown"
Hint: Some lines were ellipsized, use -l to show in full.
  • 防火墙问题
[root@registry-docker-distribution ~]#  systemctl enable firewalld
[root@registry-docker-distribution ~]#  systemctl start  firewalld
[root@registry-docker-distribution ~]#  firewall-cmd --zone=public --add-port=5000/tcp
[root@registry-docker-distribution ~]#  firewall-cmd --zone=public --add-port=5000/tcp --permanent
[root@registry-docker-distribution ~]#  firewall-cmd --zone=public --list-ports
5000/tcp

验证镜像仓库

将自建的registry仓库地址写入docker的模板机

[root@localhost ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.56.107 registry-docker-distribution

修改docker仓库配置

[root@localhost ~]# cat /etc/docker/daemon.json
{
  "insecure-registries" :["registry-docker-distribution:5000"]
}

上传自定义镜像

这里将Docker系列-4.构建镜像中使用dokerfile构建的redis自定义镜像上传至docker-distribution仓库

[root@localhost ~]# docker push registry-docker-distribution:5000/redis:4.0.14_man
The push refers to repository [registry-docker-distribution:5000/redis]
An image does not exist locally with the tag: registry-docker-distribution:5000/redis

[root@localhost ~]# docker tag redis:4.0.14_man  registry-docker-distribution:5000/redis:4.0.14_man

[root@localhost ~]# docker push registry-docker-distribution:5000/redis:4.0.14_man                 
The push refers to repository [registry-docker-distribution:5000/redis]
bc8ef3880d58: Pushed 
d0549792a5c2: Pushed 
f3aafaca0eb9: Pushed 
4014348e492a: Pushed 
eb29745b8228: Pushed 
4.0.14_man: digest: sha256:7bb931ff2fccaefedc66c131b3037fe853bb6fd15a11d7542e75044b1b761291 size: 1371

查看仓库registry-docker-distribution

[root@registry-docker-distribution redis]# tree docker/registry/v2/repositories/redis/
.
├── _layers
│   └── sha256
│       ├── 06490819811d503e757ecdb931c9dd91ed848a9f2bcdbd4f8ee1b56c7bff2850
│       │   └── link
│       ├── 508b9f6e54059456fda2cf30bcc8dc6a91608fbc86a13f98979584935bcf151f
│       │   └── link
│       ├── 6910e5a164f725142d77994b247ba20040477fbab49a721bdbe8d61cf855ac23
│       │   └── link
│       ├── 9c78867b86b984247452b9ca50437f7df6c1e1134bc560af1935bf3edfa5d8b0
│       │   └── link
│       ├── acea11d173b3aacef42265759e0f6a41996e4f179fdb45b39eae172fc11b4d1f
│       │   └── link
│       └── ebe4e876b1daeb438b123e335553f4fd3745327d524cb2369b05ec6d09b0a501
│           └── link
├── _manifests
│   ├── revisions
│   │   └── sha256
│   │       └── 7bb931ff2fccaefedc66c131b3037fe853bb6fd15a11d7542e75044b1b761291
│   │           └── link
│   └── tags
│       └── 4.0.14_man
│           ├── current
│           │   └── link
│           └── index
│               └── sha256
│                   └── 7bb931ff2fccaefedc66c131b3037fe853bb6fd15a11d7542e75044b1b761291
│                       └── link
└── _uploads

19 directories, 9 files

参考

Install and Configure Docker Registry on CentOS 7

Using the docker command and service

posted @ 2020-08-19 22:15  ElfCafe  阅读(659)  评论(0编辑  收藏  举报