Configuring and using the ssh-agent.
配置和使用ssh - agent。
Automating machine access using ssh-agent.
使用ssh - agent自动化机器访问。
Next, query ssh-agent to generate Bourne shell commands on stdout.
接下来，查询ssh - agent以在标准输出中生成Bourneshell命令。
The ssh-agent program ACTS like a gatekeeper, securely providing access to security keys as needed.
ssh - agent程序如同一个看门人，它根据需要安全地提供对安全密钥的访问。
We can instruct the shell to execute the output commands which ssh-agent displays using the shell's eval command.
使用eval命令可以指示shell执行ssh - agent显示的输出命令。
The reason that cron processes can't communicate with ssh-agent is that cron jobs are executed as child processes by cron and thus do not inherit the $SSH_AUTH_SOCK shell variable.
cron进程不能与ssh-agent通信的原因是，cron作业是作为 cron 的子进程来执行，这样它们就不会继承 $SSH_AUTH_SOCK。
So far, we've learned about several OpenSSH programs (SSH, SCP, ssh-agent and ssh-add), and we've created and installed private and public keys to enable a secure and automated login process.
迄今为止，我们已经学习了几个OpenSSH程序(ssh、scp、ssh - agent和ssh - add)，而且我们已经创建并安装了私钥与公钥来支持安全、自动化登录过程。
Ssh-agent has now become a background process which is visible using the top and ps commands.
现在，ssh - agent已经成为后台进程，可以使用命令top和ps查看。
Normally, you have to enter this passphrase every time you want to connect to any remote cloud instance that USES the key, but there is a secure way to avoid this annoyance: Employ an SSH agent.
通常，每次连接使用此密钥的任何远程云实例时，都必须输入这个密码，但是有一种安全的方法可以避免这种麻烦：使用SSH代理。
Then check the attribute of the hosts-the object should be online, its agent level should be level 1, and the supported protocols are SSH and CIM.
然后检查主机的属性—对象应该保持联机状态，其代理级别应该为一级，支持的协议应为ssh和CIM。
Then check the attribute of the hosts-the object should be online, its agent level should be level 1, and the supported protocols are SSH and CIM.
然后检查主机的属性—对象应该保持联机状态，其代理级别应该为一级，支持的协议应为ssh和CIM。
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