By Nathan Campi, Kirk Bauer
Bauer K., Campi N. Automating Linux and Unix approach management, moment variation (Apress, 2008)(ISBN 1430210591)
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Extra resources for Automating Linux and Unix System Administration
So, does your environment consist of several systems that are intricately related? Do these systems need to be updated and modified together at all times? Does the update process unavoidably cause some amount of service outage? If so, you probably want to push any changes to these systems. If these aren’t issues for you, and especially if you have a large number of systems, then the pull method is generally preferable. 2EGARDLESS OF THE METHOD YOU CHOOSE YOU STILL MUST BE AWARE OF THE LOADS THAT WILL BE placed on your systems, your network, and especially your servers.
Once logged in, you can run ood)]cajp^]od and you will have a new shell running through the agent. Or, if you use the wonderful screen program (included with most Linux installations and available from dppl6++ `ena_pknu*bob*knc+lnkfa_p+o_naaj+), you can use ood)]cajpo_naaj to begin your screen session. Use the following script as your z+*T_heajpo (or z+*tejepn_) to allow easy use of ood)]cajp within X: +^ej+^]od _`z ata_ood)]cajp^ej+op]npt)_kjpejqa 33 34 CHAPTER 3 N USING S S H TO A U TOMA TE S YS TEM A D M I N I S T R A T I O N S E C U R E LY As you can see, ood)]cajp runs the op]npt)_kjpejqa script.
So, if users can connect to a gateway machine via SSH, they can forward ports from your private network to their remote machines, possibly bypassing some or all security. This prevents a specific key from forwarding any ports over its connection. jk)T--)bkns]n`ejc6 SSH can also forward X11 connections over the encrypted connection, allowing you (and the nkkp user) to run X11 applications that display on the computer initiating the SSH connection. The jk)T--)bkns]n`ejc command disables this feature for the key in question.
Automating Linux and Unix System Administration by Nathan Campi, Kirk Bauer