Networking

管理一个网络的时候需要经常通过SSH登录多个系统，为了方便起见，我会设置SSH的无密码登录。另外一个原因是，有些使用脚本生成的cronjob中需要通过SSH在另一个系统上执行某些命令，如果不设置SSH的无密码登录，则脚本就无法在无人值守的状态下完成。
那么如何设置SSH的无密码登录呢？
假设你的账号为bsdplus，工作在一台名为openbsd45的机器上，想要不用密码登录到名为Server1的机器上。下面即是需要执行的步骤:
1. 在client上，以bsdplus登录，执行”ssh-keygen -t rsa”命令，生成RSA密钥：

[bsdplus@openbsd45 ~]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/bsdplus/.ssh/id_rsa):
2. 直接回车，确认密钥文件的路径。然后系统提示你输入passphrase：
Enter file in which to save the key (/home/bsdplus/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):

Virtual Memory

This article describes how the prstat utility can be used to provide views of a system’s activity and resource consumption. In addition, identifying activity and resource consumption of individual processes and threads is discussed. The advantages of prstat over top are identified. Examples of commonly encountered performance problems, and solutions that utilize prstat, are included.

This article will help:

1. Solaris developers understand how their applications are consuming system resources and how the applications are spending time. With this understanding, developers can identify and correct resource leaks in their applications and gain an understanding of how their applications can be changed to perform better on the Solaris platform.
2. Solaris system administrators understand how prstat can be used to identify the resources consumption taking place on their systems. With this understanding of resource consumption, system administrators can identify system performance problems and correct them.