上一篇，我们已经成功通过 registry 搭建了一个 docker 私有仓库，但仔细点我们会发现，在拉取和推送镜像时，需要附加 --insecure-registry 参数，很不方便，这次来优化一下这块。

一、生成证书

1. 生成 CA 根证书

openssl genrsa -out ca.key 2048
openssl req -x509 -new -nodes -key ca.key -subj "/CN=<YOUR IP>" -days 36500 -out ca.crt

2. 生成registry ca 证书

cat > domain_ssl.cnf <<EOF
[ req ]
req_extensions = v3_req
distinguished_name = req_distinguished_name

[ req_distinguished_name ]

[ v3_req ]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = @alt_names

[ alt_names ]
DNS.1 = <YOUR HOSTNAME>
IP.1 = <YOUR IP>
EOF

• DNS.1 写成 registry 的访问域名
• IP.1 写成 registry 所在的机器的IP

3. 生成 key 和 crt

openssl genrsa -out domain.key 2048

openssl req -new -key domain.key -config etcd_ssl.cnf -subj "/CN=etcd-server" -out domain.csr

openssl x509 -req -in domain.csr -CA ca.crt -CAkey ca.key -CAcreateserial -days 36500 -extensions v3_req -extfile domain_ssl.cnf -out domain.crt

4. 将 domain.crt 和 domain.key 复制到 /etc/docker/registry/certs/ 目录

二、配置systemd环境变量

systemctl edit registryd

文件内容如下：

[Service]
Environment="REGISTRY_HTTP_TLS_CERTIFICATE=/etc/docker/registry/certs/domain.crt"
Environment="REGISTRY_HTTP_TLS_KEY=/etc/docker/registry/certs/domain.key"

重启并查看服务状态：

[root@qijing0 ~]# systemctl restart registryd && systemctl status registryd  
● registryd.service - private registry
   Loaded: loaded (/usr/lib/systemd/system/registryd.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/registryd.service.d
           └─override.conf
   Active: active (running) since Mon 2022-11-21 23:08:20 EST; 8ms ago
     Docs: https://github.com/distribution/distribution#readme
 Main PID: 15662 (registry)
    Tasks: 5
   Memory: 6.5M
   CGroup: /system.slice/registryd.service
           └─15662 /usr/bin/registry serve /etc/docker/registry/config.yml

Nov 21 23:08:20 qijing0 systemd[1]: Started private registry.

三、在客户端机器安装证书

复制 domain.crt 到 /etc/containerd/certs.d/domain/ 目录下。
并重启 containerd

四、验证

推送镜像验证：

[root@k8s0 server]# nerdctl push domain/test-server:0.0.5
INFO[0000] pushing as a reduced-platform image (application/vnd.docker.distribution.manifest.v2+json, sha256:e0f152bb79f22dcbaaf4429cf8bc3cff75d831a5bee8042acf018560f5900586) 
manifest-sha256:e0f152bb79f22dcbaaf4429cf8bc3cff75d831a5bee8042acf018560f5900586: done           |++++++++++++++++++++++++++++++++++++++| 
config-sha256:cf3c9b089da1f8120c9ee912752dd14d56d7ef769d81d6a81423dea7324a3e5b:   done           |++++++++++++++++++++++++++++++++++++++| 
elapsed: 0.1 s                                                                    total:  6.4 Ki (63.3 KiB/s)   

• 可以看到现在能正常推送镜像了

拉取镜像验证：

[root@k8s1 tmp]# nerdctl pull registry.domain.cn/test-server:0.0.5
registry.domain.cn/test-server:0.0.5:                                          resolved       |++++++++++++++++++++++++++++++++++++++| 
manifest-sha256:e0f152bb79f22dcbaaf4429cf8bc3cff75d831a5bee8042acf018560f5900586: done           |++++++++++++++++++++++++++++++++++++++| 
config-sha256:cf3c9b089da1f8120c9ee912752dd14d56d7ef769d81d6a81423dea7324a3e5b:   done           |++++++++++++++++++++++++++++++++++++++| 
elapsed: 0.1 s                                                                    total:   0.0 B (0.0 B/s)                                         
[root@k8s1 tmp]# date
Tue Nov 22 13:54:41 CST 2022

• 可以看到现在能正常拉取镜像了

【附加1】、安装 konradkleine/docker-registry-frontend:v2 用户界面

上一节安装的是joxit/docker-registry-ui，没升级成https之前还蛮好使用的，升级之后，就一直报 CORS 跨域错误，折腾了会，还是决定换一个用户界面程序，来支持 https：

docker run \
  -d \
  -e ENV_DOCKER_REGISTRY_HOST=registry.domain.cn \
  -e ENV_DOCKER_REGISTRY_PORT=443 \
  -e ENV_DOCKER_REGISTRY_USE_SSL=1 \
  -p 5001:80 \
  konradkleine/docker-registry-frontend:v2

安装完之后，也不是一帆风顺，刚开始也获取不到镜像列表，我从浏览器访问，按f12之后，发现解析不了域名，于是手动进入容器内部，在 /etc/hosts 中添加了域名：

[root@qijing0 ~]# docker exec -it 6d /bin/bash
root@6d48c37a52c5:/# cat >>/etc/hosts<<EOF
> 192.168.3.1 registry.domain.cn
> EOF

ok!，现在可以了，通过浏览器能顺利访问到镜像列表了，足够了。

用户界面首页
镜像列表