By Nathan Campi, Kirk Bauer
Bauer K., Campi N. Automating Linux and Unix method management, moment version (Apress, 2008)(ISBN 1430210591)
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Extra resources for Automating Linux and Unix System Administration
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.
The bulk of what we’ll be doing in this book is copying files, modifying files, and taking actions based on the success or failure of earlier file operations. Certain operations might prove tricky, but most of what we’re doing should be familiar to UNIX SAs. Understanding the Procedure Before Automating It We’ve seen many administrators open a cfengine config file to automate a task and end up sitting there, unsure of what to do. It’s an easy mistake to make when you need to modify many hosts and want to start the automation right away.
No spaces are allowed within the option string unless they are contained within double quotes. If you specify multiple options, you must separate them with commas. Here’s a list of the options and a brief description of each (the ood` man page contains more detailed information): bnki9l]ppanj)heop: This option can specify a list of hosts from which the connection must be made. This way, even if the key (and the passphrase) is stolen, the connection still must be made from the appropriate host(s).