spring cloud config center Git SSH configuration

Git SSH configuration using properties

By default, the JGit library used by Spring Cloud Config Server uses SSH configuration files such as ~/.ssh/known_hosts and /etc/ssh/ssh_config when connecting to Git repositories by using an SSH URI. In cloud environments such as Cloud Foundry, the local filesystem may be ephemeral or not easily accessible. For those cases, SSH configuration can be set by using Java properties. In order to activate property-based SSH configuration, the spring.cloud.config.server.git.ignoreLocalSshSettings property must be set to true, as shown in the following example:

  spring:
    cloud:
      config:
        server:
          git:
            uri: git@gitserver.com:team/repo1.git
            ignoreLocalSshSettings: true
            hostKey: someHostKey
            hostKeyAlgorithm: ssh-rsa
            privateKey: |
                         -----BEGIN RSA PRIVATE KEY-----
                         MIIEpgIBAAKCAQEAx4UbaDzY5xjW6hc9jwN0mX33XpTDVW9WqHp5AKaRbtAC3DqX
                         IXFMPgw3K45jxRb93f8tv9vL3rD9CUG1Gv4FM+o7ds7FRES5RTjv2RT/JVNJCoqF
                         ol8+ngLqRZCyBtQN7zYByWMRirPGoDUqdPYrj2yq+ObBBNhg5N+hOwKjjpzdj2Ud
                         1l7R+wxIqmJo1IYyy16xS8WsjyQuyC0lL456qkd5BDZ0Ag8j2X9H9D5220Ln7s9i
                         oezTipXipS7p7Jekf3Ywx6abJwOmB0rX79dV4qiNcGgzATnG1PkXxqt76VhcGa0W
                         DDVHEEYGbSQ6hIGSh0I7BQun0aLRZojfE3gqHQIDAQABAoIBAQCZmGrk8BK6tXCd
                         fY6yTiKxFzwb38IQP0ojIUWNrq0+9Xt+NsypviLHkXfXXCKKU4zUHeIGVRq5MN9b
                         BO56/RrcQHHOoJdUWuOV2qMqJvPUtC0CpGkD+valhfD75MxoXU7s3FK7yjxy3rsG
                         EmfA6tHV8/4a5umo5TqSd2YTm5B19AhRqiuUVI1wTB41DjULUGiMYrnYrhzQlVvj
                         5MjnKTlYu3V8PoYDfv1GmxPPh6vlpafXEeEYN8VB97e5x3DGHjZ5UrurAmTLTdO8
                         +AahyoKsIY612TkkQthJlt7FJAwnCGMgY6podzzvzICLFmmTXYiZ/28I4BX/mOSe
                         pZVnfRixAoGBAO6Uiwt40/PKs53mCEWngslSCsh9oGAaLTf/XdvMns5VmuyyAyKG
                         ti8Ol5wqBMi4GIUzjbgUvSUt+IowIrG3f5tN85wpjQ1UGVcpTnl5Qo9xaS1PFScQ
                         xrtWZ9eNj2TsIAMp/svJsyGG3OibxfnuAIpSXNQiJPwRlW3irzpGgVx/AoGBANYW
                         dnhshUcEHMJi3aXwR12OTDnaLoanVGLwLnkqLSYUZA7ZegpKq90UAuBdcEfgdpyi
                         PhKpeaeIiAaNnFo8m9aoTKr+7I6/uMTlwrVnfrsVTZv3orxjwQV20YIBCVRKD1uX
                         VhE0ozPZxwwKSPAFocpyWpGHGreGF1AIYBE9UBtjAoGBAI8bfPgJpyFyMiGBjO6z
                         FwlJc/xlFqDusrcHL7abW5qq0L4v3R+FrJw3ZYufzLTVcKfdj6GelwJJO+8wBm+R
                         gTKYJItEhT48duLIfTDyIpHGVm9+I1MGhh5zKuCqIhxIYr9jHloBB7kRm0rPvYY4
                         VAykcNgyDvtAVODP+4m6JvhjAoGBALbtTqErKN47V0+JJpapLnF0KxGrqeGIjIRV
                         cYA6V4WYGr7NeIfesecfOC356PyhgPfpcVyEztwlvwTKb3RzIT1TZN8fH4YBr6Ee
                         KTbTjefRFhVUjQqnucAvfGi29f+9oE3Ei9f7wA+H35ocF6JvTYUsHNMIO/3gZ38N
                         CPjyCMa9AoGBAMhsITNe3QcbsXAbdUR00dDsIFVROzyFJ2m40i4KCRM35bC/BIBs
                         q0TY3we+ERB40U8Z2BvU61QuwaunJ2+uGadHo58VSVdggqAo0BSkH58innKKt96J
                         69pcVH/4rmLbXdcmNYGm6iu+MlPQk4BUZknHSmVHIFdJ0EPupVaQ8RHT
                         -----END RSA PRIVATE KEY-----

　　The following table describes the SSH configuration properties.

 Table 1. SSH Configuration Properties

Property Name	Remarks
ignoreLocalSshSettings	If true, use property-based instead of file-based SSH config. Must be set at as spring.cloud.config.server.git.ignoreLocalSshSettings, not inside a repository definition.
privateKey	Valid SSH private key. Must be set if ignoreLocalSshSettings is true and Git URI is SSH format.
hostKey	Valid SSH host key. Must be set if hostKeyAlgorithm is also set.
hostKeyAlgorithm	One of ssh-dss, ssh-rsa, ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, or ecdsa-sha2-nistp521. Must be set if hostKey is also set.
strictHostKeyChecking	true or false. If false, ignore errors with host key.
knownHostsFile	Location of custom .known_hosts file.
preferredAuthentications	Override server authentication method order. This should allow for evading login prompts if server has keyboard-interactive authentication before the publickey method.

根据官网的配置写，报了个错：Property 'spring.cloud.config.server.git.privateKey' is not a valid private key

　　仔细查看后发现我的私钥是以BEGIN OPENSSH PRIVATE KEY开头，END OPENSSH PRIVATE KEY结尾，而

现在服务端如mysql，gitee等还不支持这种格式，因此我们还是生成原来的格式：以BEGIN RSA PRIVATE KEY开头，

END RSA PRIVATE KEY结尾。

　　现在使用命令 ssh-keygen -t rsa -C  生成ssh，默认是以新的格式生成，id_rsa的第一行变成了“BEGIN OPENSSH PRIVATE KEY” 而不在是“BEGIN RSA PRIVATE KEY”，解决方法：使用 ssh-keygen -m PEM -t rsa -b 4096 -C "邮箱"  来生成。

　　　　-m 参数指定密钥的格式，PEM（也就是RSA格式）是之前使用的旧格式

　　　　-b：指定密钥长度；

　　　　-e：读取openssh的私钥或者公钥文件；

　　　　-C：添加注释；

　　　　-f：指定用来保存密钥的文件名；

　　　　-i：读取未加密的ssh-v2兼容的私钥/公钥文件，然后在标准输出设备上显示openssh兼容的私钥/公钥；

　　　　-l：显示公钥文件的指纹数据；

　　　　-N：提供一个新密语；

　　　　-P：提供（旧）密语；

　　　　-q：静默模式；

　　　　-t：指定要创建的密钥类型

　　重新配置私钥，就可以啦。

参考链接：

　　https://www.cnblogs.com/alinainai/p/11100089.html

　　https://www.cnblogs.com/soner/p/10412888.html

重新生成密钥并且同步到github上之后本地测试链接 ssh -T git@github.com 通过之后，config服务重启再次测试报错：org.eclipse.jgit.api.errors.TransportException: git@github.xxx.git: remote hung up unexpectedly

解决方法：

#          ignoreLocalSshSettings: true
          ignore-local-ssh-settings: false

　　因为我看true爆红，所以替换YML的配置，有时启动会链接超时，不过不妨碍链接github。