x509: cannot validate certificate because of not containing any IP SANs

CentOs中docker 安装私有仓库，并通过https方式上传镜像

• 安装仓库registry, Tag为2

  [weshzhu@weshzhu ~]$ docker pull registry:2
  2: Pulling from library/registry
  Digest: sha256:672d519d7fd7bbc7a448d17956ebeefe225d5eb27509d8dc5ce67ecb4a0bce54
  Status: Image is up to date for registry:2
  

  查看仓库，此时先不启动容器。

  [weshzhu@weshzhu certs]$ docker images
  REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
  registry              2                   d1fd7d86a825        4 weeks ago         33.3MB

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• 通过OpenSSL工具生成自签名的证书，后面将用于对请求进行校验

  对于证书以及OpenSSL, 请移目那些证书相关的玩意儿

  首先找到OpenSSL工具配置文件openssl.cnf，对于Centos,目录在/etc/pki/tls/中

  [weshzhu@weshzhu ~]$ cd /etc/pki/tls/
  [weshzhu@weshzhu tls]$ ll
  total 12
  lrwxrwxrwx. 1 root root    49 Jan 26 19:10 cert.pem -> /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem
  drwxr-xr-x. 2 root root   193 Feb  7 21:42 certs
  drwxr-xr-x. 2 root root    74 Jan 26 19:10 misc
  -rw-r--r--. 1 root root 10955 Feb  7 20:12 openssl.cnf
  drwxr-xr-x. 2 root root     6 Aug  4  2017 private

  编辑openssl.cnf,在[v3_ca]下面添加：subjectAltName = IP:域名|IP地址

  [ v3_ca ]
  subjectAltName = IP:172.10.15.110

  否则将会报错：

  x509: cannot validate certificate for  because it doesn't contain any IP SANs

  这是因为在证书中，要包含一些信息，比如国家、机构等等，好像访问的私有仓库ip或者域名必须要有，否则不予通过，就会报上面的错误。如果有读者发现此处有错误，请在下方提出。谢谢！

  修改完openssl配置文件后，可以生产私有证书，要记住生成证书的目录，后面会用到。

  [weshzhu@weshzhu certs]$ sudo openssl req -newkey rsa:2048 -new -nodes -x509 -days 3650 -keyout registry.key -out registry.crt
  [sudo] password for weshzhu: 
  Generating a 2048 bit RSA private key
  .................................................................................................................................................+++
  .........................................................................................................................................................+++
  
  writing new private key to 'registry.key'
  -----
  
  You are about to be asked to enter information that will be incorporated
  into your certificate request.
  What you are about to enter is what is called a Distinguished Name or a DN.
  There are quite a few fields but you can leave some blank
  For some fields there will be a default value,
  
  If you enter '.', the field will be left blank.
  -----
  
  Country Name (2 letter code) [XX]:       #该处让交互输入国家、省等，可以直接Enter跳过
  State or Province Name (full name) []:
  Locality Name (eg, city) [Default City]:
  Organization Name (eg, company) [Default Company Ltd]:
  Organizational Unit Name (eg, section) []:
  Common Name (eg, your name or your server's hostname) []:172.10.15.110  #该处输入私有仓库的ip地址或者域名
  Email Address []:

  当然，上面私有证书生成，可以通过-subj指定证书信息：

   sudo openssl req -subj '/C=CN/ST=BeiJing/L=HaiDian/CN= ' -newkey rsa:2048 -new -nodes -x509 -days 3650 -keyout registry.key -out
   # -subj 通过C指定国家、ST指定省份、L指定区、CN指定域名或者IP

  此方法并没有经过试验，请感兴趣的童靴验证一下。

  可以看到在当前目录中，有.crt 和 .key文件

  [weshzhu@weshzhu certs]$ ll
  total 8
  -rw-r--r--. 1 root root 1306 Feb  8 15:04 registry.crt
  -rw-r--r--. 1 root root 1704 Feb  8 15:04 registry.key

---

• 将生成的私有证书追加到系统的证书管理文件中，否则后面push和login和pull时会报如下错误：

  [weshzhu@weshzhu certs]# cat ./registry.crt >> /etc/pki/tls/certs/ca-bundle.crt

  未cat到系统的crt文件中
  [weshzhu@weshzhu ~]$ docker push 192.168.0.123/rabbitmq:3.7
  The push refers to repository [192.168.0.123/rabbitmq]
  Get https:///v2/: x509: certificate signed by unknown authority

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• 重启docker, 该步骤一定不要省略，否则有可能加载私钥失败
  systemctl restart docker

---

• 启动私有仓库镜像 registry
  注意：在启动时，有参数需要配置
  
docker run -d -p 443:443 --name registry -v /deploy/certs:/certs -e REGISTRY_HTTP_ADDR=0.0.0.0:443 -e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/registry.crt -e REGISTRY_HTTP_TLS_KEY=/certs/registry.key registry:2

  -d 后台运行
  -p 443:443 将容器的端口443映射到主机的443端口
  –name 给容器起个名字 registry
  -v /deploy/certs:/certs 主机的目录/deploy/certs映射到容器的/certs ，目的是将生成的私有证书映射到容器中
  -e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/registry.crt 指定TLS协议验证的证书目录：该目录为容器的registry.crt所在的目录
  -e REGISTRY_HTTP_TLS_KEY=/certs/registry.key 指定TLS协议使用的key的目录：该目录为容器的registry.key所在的目录

---

• 上面的步骤按顺序操作完成后，可以尝试docker push一个镜像到私有仓库中。
  查看docker安装了哪些镜像：

  [weshzhu@weshzhu certs]$ docker images
  REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
  registry              2                   d1fd7d86a825        4 weeks ago         33.3MB
  nginx                 latest              3f8a4339aadd        6 weeks ago         108MB
  

  将上传的镜像重新Tag一下：

  docker tag nginx[:tag] [ipaddress]/nginx
  
  #:tag 为镜像的tag,如果该镜像的tag为latest，则可以省略
  
  
  #[ipaddress] 为私有仓库的ip地址或域名，也就是上面步骤在openssl中添加的`subjectAltName = IP:172.10.15.110`地址或域名
  
  

  查看镜像，发现多了一个以ip地址为开头的image

  [weshzhu@weshzhu certs]$ docker images
  REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
  registry              2                   d1fd7d86a825        4 weeks ago         33.3MB
  192.168.0.123/nginx   latest              3f8a4339aadd        6 weeks ago         108MB
  nginx                 latest              3f8a4339aadd        6 weeks ago         108MB
  

  此时push该带ip地址的镜像到私有仓库中

  [weshzhu@weshzhu certs]# docker push 172.10.15.110/nginx
  The push refers to repository [172.10.15.110/nginx]
  a103d141fc98: Pushed 
  73e2bd445514: Pushed 
  2ec5c0a4cb57: Pushing [===========================================>       ]   48.2MB/55.26MB
  

  [weshzhu@weshzhu certs]# docker push 172.10.15.110/nginx
  The push refers to repository [172.10.15.110/nginx]
  a103d141fc98: Pushed 
  73e2bd445514: Pushed 
  2ec5c0a4cb57: Pushed 
  latest: digest: sha256:926b086e1234b6ae9a11589c4cece66b267890d24d1da388c96dd8795b2ffcfb size: 948