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| <h1>安全化 Datanode</h1> |
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| <!--- |
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| <p>Hadoop 中 datanode 的安全机制是通过给每个节点创建 Keytab 文件实现的。Ozone 的 datanode 安全机制不依赖 Kerberos，而是改用 datanode 证书。</p> |
| <p>但是我们也支持传统的基于 Kerberos 的认证来方便现有用户，用户只需要在 hdfs-site.xml 里配置下面参数即可：</p> |
| <table> |
| <thead> |
| <tr> |
| <th>参数名</th> |
| <th>描述</th> |
| </tr> |
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| <tbody> |
| <tr> |
| <td>dfs.datanode.kerberos.principal</td> |
| <td>datanode 的服务主体名 <br/> 比如：dn/_<a href="mailto:HOST@REALM.COM">HOST@REALM.COM</a></td> |
| </tr> |
| <tr> |
| <td>dfs.datanode.kerberos.keytab.file</td> |
| <td>datanode 进程所使用的 keytab 文件</td> |
| </tr> |
| <tr> |
| <td>hdds.datanode.http.auth.kerberos.principal</td> |
| <td>datanode http 服务器的服务主体名</td> |
| </tr> |
| <tr> |
| <td>hdds.datanode.http.auth.kerberos.keytab</td> |
| <td>datanode http 服务器的服务主体登录所使用的 keytab 文件</td> |
| </tr> |
| </tbody> |
| </table> |
| <h2 id="如何安全化-datanode">如何安全化 datanode</h2> |
| <p>在 Ozone 中，当 datanode 启动并发现 SCM 的地址之后，datanode 首先创建私钥并向 SCM 发送证书请求。</p> |
| <h3>通过 Kerberos 颁发证书<span class="badge badge-secondary">当前模型</span></h3> |
| SCM 有一个内置的 CA 用来批准证书请求，如果 datanode 已经有一个 Kerberos keytab，SCM 会信任它并自动颁发一个证书。 |
| <h3>手动颁发<span class="badge badge-primary">开发中</span></h3> |
| 如果 datanode 是新加入的并且没有 keytab，那么证书请求需要等待管理员的批（手动批准功能尚未完全支持）。换句话说，信任关系链由集群管理员建立。 |
| <h3>自动颁发 <span class="badge badge-secondary">开发中</span></h3> |
| 如果你通过 Kubernetes 这样的容器编排软件运行 Ozone，Kubernetes 需要为 datanode 创建一次性 token，用于在启动阶段证明 datanode 容器的身份。（这个特性也正在开发中。） |
| <p>证书颁发后，datanode 的安全就得到了保障，并且 OM 可以颁发块 token。如果 datanode 没有证书或者 SCM 的根证书，datanode 会自动进行注册，下载 SCM 的根证书，并获取自己的证书。</p> |
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