利用 Harbor 搭建企业级私有镜像仓库
背景
docker中要使用镜像，一般会从本地、docker Hup公共仓库和其它第三方公共仓库中下载镜像，一般出于安全和外网(墙)资源下载速率的原因考虑企业级上不会轻易使用。那么有没有一种办法可以存储自己的镜像又有安全认证的仓库呢?
—-> 企业级环境中基于Harbor搭建自己的安全认证仓库。
Harbor是VMware公司最近开源的企业级Docker Registry项目, 其目标是帮助用户迅速搭建一个企业级的Docker registry服务。
安装Harbor
harbor需要安装docker和docker-compose才能使用，安装docker的步骤可参考之前的旧文：Docker容器技术入门（一）
安装docker-dompose
docker-dompose安装步骤如下：
下载最新版的docker-compose文件
$ curl -L https://github.com/docker/compose/releases/download/1.23.2/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose添加可执行权限
$ chmod +x /usr/local/bin/docker-compose验证版本
$ docker-compose -v
docker-compose version 1.23.2, build 1110ad01获取Harbor软件包
https://storage.googleapis.com/harbor-releases/release-1.7.0/harbor-offline-installer-v1.7.1.tgz解压
tar -xf harbor-offline-installer-v1.7.1.tgz -C /usr/local/编辑配置文件
$ cd /usr/local/harbor
$ vim harbor.cfg
hostname = reg.for-k8s.com
# 本机外网IP或域名，该地址供用户通过UI进行访问，不要使用127.0.0.1
ui_url_protocol = https
# 用户访问私仓时使用的协议，默认时http，配置成https
db_password = root123
# 指定mysql数据库管理员密码
harbor_admin_password：Harbor12345
# harbor的管理员账户密码
ssl_cert = /data/cert/reg.for-k8s.com.crt
# 设置证书文件路径
ssl_cert_key = /data/cert/reg.for-k8s.com.key
# 设置证书密钥文件路径
####其他配置选项按需填写即可生成ssl证书
生成根证书
$ cd /dada/cert/
$ openssl req -newkey rsa:4096 -nodes -sha256 -keyout ca.key -x509 -days 365 -out ca.crt -subj "/C=CN/L=Shanghai/O=harbor/CN=harbor-registry"生成一个证书签名, 设置访问域名为 reg.for-k8s.com
$ openssl req -newkey rsa:4096 -nodes -sha256 -keyout reg.for-k8s.com.key -out server.csr -subj "/C=CN/L=Shanghai/O=harbor/CN=reg.for-k8s.com"生成主机证书
$ openssl x509 -req -days 365 -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out reg.for-k8s.com.crt通过自带脚本一键安装
安装步骤如下：
$ cd /usr/local/harbor/
./install.sh
......
......
......
✔ ----Harbor has been installed and started successfully.----
Now you should be able to visit the admin portal at https://reg.for-k8s.com.
For more details, please visit https://github.com/goharbor/harbor .然后绑定hosts访问即可:
默认账号密码 admin / Harbor12345
ok 那上面的私有仓库服务已经搭建完毕了，该怎么使用呢？
首先在harbor上创建一个项目myproject(我这里不使用默认的libary)
这里我选择私有仓库, pull/push都需要在主机上面执行docker login才行;
1、当我通过Dockerfile构建一个新镜像的时候, 直接指明registry和标签, 比如:
$ docker build -t reg.for-k8s.com/myproject/mydocker-image:v1.0.1 .
Sending build context to Docker daemon 97.21MB
Step 1/12 : FROM 1and1internet/ubuntu-16
---> dbf985f1f449
Step 2/12 : MAINTAINER guomaoqiu <guomaoqiu@gmail.com>
---> Using cache
---> 598894333db9
......
......
Successfully built b190966f3773
Successfully tagged reg.for-k8s.com/myproject/mydocker-image:v1.0.1
$ docker images | grep myproject
reg.for-k8s.com/myproject/mydocker-image v1.0.1 b190966f3773 44 seconds ago 482MB2、加入当你从别处获取的镜像想上传到私有仓库呢？就是打个tag就行啦, 比如我想把从官网的这个nginx镜像放到我的仓库:
$ docker tag nginx reg.for-k8s.com/myproject/mynginx:latest
$ docker images | grep myproject
reg.for-k8s.com/myproject/mydocker-image v1.0.1 b190966f3773 2 minutes ago 482MB
reg.for-k8s.com/myproject/mynginx latest 568c4670fa80 5 weeks ago 109MB3、登录仓库
$ docker login -u admin -p Harbor12345 reg.for-k8s.com
Username: admin
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
Login Succeeded4、最后把本地的镜像push到仓库
当我执行这个的时候报错了：
docker push reg.for-k8s.com/myproject/mynginx:latest
Error response from daemon: Get https://reg.for-k8s.com/v2/: x509: certificate signed by unknown authority解决办法就是如果不在客户端部署证书，那么在Docker启动时设置参数 “–insecure-registry IP/仓库域名”,然后重载服务重启docker进程；注意的是我这里使用的这个域名是自定义的，那么需要在需要上传下载镜像的机器上，同样需要修改docker进程参数，并且绑定hosts,否则即使配置了参数，这个域名没法解析也是push/pull不到镜像的。
5、再次执行push操作:
$ docker push reg.for-k8s.com/myproject/mynginx:latest
The push refers to repository [reg.for-k8s.com/myproject/mynginx]
b7efe781401d: Pushed
c9c2a3696080: Pushed
7b4e562e58dc: Pushed
latest: digest: sha256:e2847e35d4e0e2d459a7696538cbfea42ea2d3b8a1ee8329ba7e68694950afd3 size: 948
$ [root@k8s-m1 kubectl-terminal-ubuntu]# docker push reg.for-k8s.com/myproject/mydocker-image:v1.0.1
The push refers to repository [reg.for-k8s.com/myproject/mydocker-image]
96dca48ee72c: Pushed
fa879b69764c: Pushed
4d823b00e6b7: Pushed
6bf6e96da4a0: Pushed
eedda540c6a8: Pushed
f2a971e53afa: Pushed
3ee1a3b3fd18: Pushed
8a225cfa6dea: Pushed
428c1ba11354: Pushed
b097f5edab7b: Pushed
27712caf4371: Pushed
8241afc74c6f: Pushed
v1.0.1: digest: sha256:a20629f62d73cff93bf73b31958878a1d76c2dd42e36ebb2cb6d0ac294a46da7 size: 2826
以上push成功；
测试pull
那为了测试pull并且能成功运行，我这里通过kuernetes运行一个DaemonSet，镜像采用: mynginx ,并且设置镜像pull策略为Always, 然后创建一个服务在集群内部通过ClusterIP能够访问, yaml如下:
$ cat >> test.yaml << EOF
apiVersion: v1
kind: Service
metadata:
labels:
app: mynginx-service
name: mynginx-service
spec:
ports:
- name: 80-80
port: 80
protocol: TCP
targetPort: 80
selector:
run: mynginx
type: ClusterIP
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
labels:
run: mynginx
name: mynginx
spec:
selector:
matchLabels:
run: mynginx
template:
metadata:
labels:
run: mynginx
spec:
containers:
- image: reg.for-k8s.com/myproject/mynginx:latest
imagePullPolicy: Always
name: mynginx
EOF
$ kubectl apply -f daemonset.yaml
service/mynginx-service created
daemonset.extensions/mynginx create由于我刚才创建仓库的时候设置的仓库隐私性为私有的，需要docker login 登录成功之后，k8s kubectl create 就拉取不了镜像；如果设置为公开，那么久不需要配置这一步骤。只需要docker login 登录成功之后，k8s kubectl create 就可以拉取镜像; 但是我不想让其为公开的；所以还需要配置如下步骤：
配置一个私有仓库harbor的secret：
kubectl create secret docker-registry registry-secret --namespace=default \
--docker-server=https://reg.for-k8s.com --docker-username=admin \
--docker-password=Harbor12345部署时指定imagePullSecrets, 修改在上面的yaml中添加这个选项:
$ cat >> test.yaml << EOF
apiVersion: v1
kind: Service
metadata:
labels:
app: mynginx-service
name: mynginx-service
spec:
ports:
- name: 80-80
port: 80
protocol: TCP
targetPort: 80
selector:
run: mynginx
type: ClusterIP
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
labels:
run: mynginx
name: mynginx
spec:
selector:
matchLabels:
run: mynginx
template:
metadata:
labels:
run: mynginx
spec:
containers:
- image: reg.for-k8s.com/myproject/mynginx:latest
imagePullPolicy: Always
name: mynginx
imagePullSecrets:
- name: registry-secret
EOF
$ kubectl apply -f daemonset.yaml
service/mynginx-service created
daemonset.extensions/mynginx create
以上就是基于Harbor组建企业级私有镜像仓库的全部过程。
版权申明：本文系作者原创投稿，版权归原作者所有。
