Cfengine-Tutorial. AUTOMATED SYSTEM ADMINISTRATION. Kirk: “I’m curious, Doctor, why is it called the M5?” Daystrom: “Well you see, M1 to M4 were not. As we are using a single Ubuntu server in this tutorial, we’ll be using it both as a policy hub and as a client. To start CFEngine’s policy hub, you. Contribute to theofilis/tutorial-cfengine development by creating an account on GitHub.
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Invoking cfengineUp: As a system administrator you should, of course, exercise great caution when making rules which can delete users’ files. In fact, the non-uniformity of Unix was a major headache. This describes how things should be; with a little bit of imperative which describes how to do it, or what to do.
Spamming and securityNext: It is not the purpose of this section to explain the use of the automounter in detail, only to offer hints as to how cfengine can be used to simplify and rationalize automount configuration for the already initiated. From this point the search for files proceeds recursively into subdirectories with a maximum limit set by the recurse directive, and various options for dealing with symbolic links and device boundaries.
cfengine-Tutorial – Informatique
Unlike the shell, cfengine treats these three delimiters in precisely the same way. This is probably not the right way to think when using cfengine. Learning these fully will take some time, and only then will you harness the full power of cfengine.
More advanced concepts Defining classes and making exceptions Cfengine communicates with itself by passing messages in the form of classes. Building flexible time classesNext: There is no difference between them.
These classes could be used to determine when students have their summer vacation, for instance, in order to perform extra tidying, or to specially maintain some administrative policy for the duration of a conference. The dots in this string will be replaced by underscores. ActionSequence – files files: If you run cfengine without arguments so that the default filename is cfengine. Use nano or your favorite text editor to create a new file called myPolicy.
This file should contain every host name you ever want to configure remotely, because you can still select subsets of the file by specifying classes which the remote host will understand.
For security reasons, iteration is supported only in the following contexts: Save file changes by typing: Moreover, since the homepattern matches any filesystem ending in u-something, it recognizes the two home directories in the mountables list — and therefore the two binary directories also.
Prerequisites Before you begin, you should cfenyine access to: Here are some examples: Finally, there is a number of reserved classes.
This is determined by the actionsequencesee the reference manual. A regular expression is a generalized wildcard. Thus the regular expression cfengine would match only the string “cfengine”, not “Cfengine” or “cfengin” etc. The default value is unlimited. If we don’t, the declaration will be ignored. Safe defaults exist for these directives so that in practice they may be treated as options.
This means that anyone in your NIS domain has password free access to the system!! Equivalent one-line sed operations involve editing the same file perhaps many times to achieve the same results–without the safety checks in addition. Since such files are a potential security risk, cfengine always prints a warning when it encounters cfebgine new one one which is not already in its list. Feedback classesNext: Acommonscenarioisthatyou,asadministrator,fetchanewpackageusingFTP,compile it and install it without thinking too carefully.