By Kirk Bauer, Nate Campi

ISBN-10: 1430210605

ISBN-13: 9781430210603

No matter if you would like a community of ten Linux computers and a server or an information heart with a number of thousand UNIX nodes, you must know the way to automate a lot of the set up, configuration, and conventional process administration.

Build your community as soon as utilizing cfengine, and the community construct will paintings, with no person intervention, on any you wish. Automating Linux and Unix method management, moment version is exclusive in its specialize in how you can make the method administrator's task more uncomplicated and extra effective: rather than simply coping with the procedure administrator's time, the ebook explains the know-how to automate repetitive projects and the method to automate successfully.

* either new and pro execs will cash in on industry–leading insights into the automation process.
*System directors will reach a radical seize of cfengine, kickstart, and shell scripting for automation.
*After interpreting all chapters and following all workouts during this ebook, the reader should be capable of organize something from a Linux facts heart to a small place of work community.

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Additional resources for Automating Linux and Unix System Administration (2nd Edition)

Example text

Forwarding Keys You can configure your SSH client to forward your ood)]cajp as well. If you enable this option, you can connect from machine to machine while your private key is in memory only on the original machine (the start of the chain). The key itself is never transmitted over the network. You’ll find the agent useful when connecting to machines on private networks. You can connect to the gateway machine and then connect to internal machines that you cannot access directly from your workstation.

Barrett, Richard E. Silverman, and Robert G. , 2005). ” The SSH suite of programs provides secure communications for remote logins, and cfengine provides secure communications for system automation (along with the automation framework itself). 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.

To do so, put the following in your ]qpdkneva`[gauo file on the remote host (the key has been trimmed down for easier reading): jk)T--)bkns]n`ejc(jk)]cajp)bkns]n`ejc(bnki9&*g]u^aa*knc ood)no]=>***UV This example also limits connections to this account. The key will be granted access only if the canonical hostname is okiapdejc*g]u^aa*knc. Allowing Limited Command Execution Suppose you have a script that monitors a set of servers. Root access is not necessary for monitoring the systems. The script does, however, need to reboot the machines in some C HA P TER 3 N US 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 L Y cases, which does require root access.

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Automating Linux and Unix System Administration (2nd Edition) by Kirk Bauer, Nate Campi


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