By Nathan Campi, Kirk Bauer

Having the authors consultant you thru the method of configuring computerized installations and configuration of servers is priceless.

This e-book is a needs to for any linux/unix sysadmin available in the market. i am hoping there's a third version with the hot Cfengine three soon!

This booklet isn't really for the start linux/unix admin, although. you will have a radical wisdom of the platforms already. upon getting that, utilizing the equipment during this ebook will prevent and your bosses numerous hours of dealing with your servers.

I wish to thank the authors for a super piece of labor.

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Extra resources for Automating Linux And Unix System Administration

Sample text

SSH and cfengine share the same distributed authentication model. SSH clients use a public-key exchange to verify the identity of an SSH server, with the option of trusting the remote host’s identity the first time the host’s key is seen. Cfengine also uses public-key authentication, although the cfengine server daemon also authenticates connecting clients for additional security. As with SSH, you can configure cfengine to trust the identity of other hosts upon initial connection. We recommend you allow cfengine to trust the identity of other hosts in this manner.

Defining Policy We keep mentioning “policy,” which might sound like a big document handed down from on high, bound in leather and signed in blood by all executives at your company. This isn’t what we mean. , legislation, credit card–security guidelines, site security policy, and so on), it is purely a statement of how the SA team believes the systems should be configured. The problem with most sites (whether running UNIX-like operating systems, Windows, or other OSs) is that many machines will at best only partially comply with policy.

Getting Advanced with ssh-agent You can also use ood)]cajp without starting a new process. In the Bash shell (or any POSIX-compliant shell) you can, for example, start ood)]cajp like this: ar]h\ood)]cajp\ C HA P TER 3 ฀ U S ING S S H TO A U T O M A T E S Y S T E M A D M I N I S T R A T I O N S E C U R E LY Note the backticks around ood)]cant; they cause the output of this command to be passed to the ar]h command that will execute the code. In fact, all ood)]cajp really does is start itself and print out some environment variables to be set by the shell.

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