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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This is determined by the actionsequencesee the reference manual. Remote execution of cfengineNext: How it works Remote file distribution This section describes how you can set up cfd as a remote file server which can result in the distrubution of files to client hosts tutorail a more democratic way than with programs like rdist.

Global configurations Cfengine’s model for NFS-mounted filesystems Most of the filesystems that you will want to make available across the network are going to fall into one of two categories. Log filesUp: This file has the suffix. You need to switch on relevant tasks and switch off unwanted tasks depending on the time of day. Emulating rdistNext: If you are not the NIS administrator, you will have to ask to have a netgroup installed.

An individual section-declaration in the program looks something like this: Feedback classesPrevious: Cfengine uses a hashing algorithm to generate a number between zero and a maximum value in minutes which you define, like this: If we really wanted to burn jacobswe could remove all rights to the file like this user: Inafter more than five years of research, CFEngine 3 was introduced, which incorporated promise theory as “a way to make CFEngine both simpler and more powerful at the same time”, according to Burgess.


Examples and Tutorials

Global configurations Managing processes Cfengine allows you to check tutotial the existence of processes on your system, send those processes signals such as kill and perhaps restart those processes.

Cfengine 3 is the original configuration management solution, but also the most newly refurbished of the Open Source configuration tools, and the only one based on actual research. There is no particular advantage to doing this unless you are running cfengine on some very slow hardware. Files can be deleted if they have not been accessed for n-days. As such, all hosts read the same configuration file. If you want to manage multiple machines using your Ubuntu server, you will have to repeat steps 1, 2, and 3 on each of the machines.

Your path might vary depending on your platform and the packages your are using. When the automounter is running, filesystems are mounted only when a user tries to access a file which resides on one of those filesystem. The above structure can be repeated to build up a configuration file or script.

An ACL alias is defined in a separate part of the program which looks like this: Changes in the system might require all users to define a new environment variable, for instance.

Safe defaults exist for these directives so that in practice they may be treated as options. Because cfengine always uses a reliable TCP protocol for connections, it verifies each connection rather than simply broadcasting openly. Copy a single file to all users on the system, changing the owner of the file for each user automatically.

Defining classes tutorisl, Next: Had we used the method overwrite above, we would have eliminated all other access permissions for every user and added the above. Since cfengine assumes that any class it does not understand is the name of some host, it will simply ignore entries it does not recognize.


Automating System Administration with Cfengine 3: An Introduction

In fact, the non-uniformity of unix was a major headache. Thus a system which does not require a filesystem will not attempt to mount it. Invoking cfengineUp: Run my example code to copy the file from cf-serverd: An interpreter runs on every host on your network and parses the master file or file-set ; the configuration of each host is checked against this file and then, if you request it, any deviations from the defined configuration are fixed automatically.

For completeness, here is a complete summary of the structure of a very general cfengine configuration program. This way you do not have to rely on cron running on every system.

The lesson is that, if we want to use cfengine to make one single program which can be run on any host of any type, then we need some way of restricting the above link so that it only gets checked on SunOS systems.

Monitoring important filesNext: Its internal editing functions operate at a higher level which are designed for transparency rather than flexibility.

How to Install and Use CFEngine Community Edition on Ubuntu | DigitalOcean

Thus this expression would match the empty string, “c”, “cccc”, “ccccccccc”, but not “cccx”. The new feature here is the acl directive.

As part of a copy action, while recursively checking whether to copy a file tree.