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.
| Author: | Tekora Tor |
| Country: | Benin |
| Language: | English (Spanish) |
| Genre: | Automotive |
| Published (Last): | 24 August 2016 |
| Pages: | 206 |
| PDF File Size: | 20.25 Mb |
| ePub File Size: | 15.43 Mb |
| ISBN: | 890-7-66691-333-3 |
| Downloads: | 32969 |
| Price: | Free* [*Free Regsitration Required] |
| Uploader: | Zulkile |
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. The generic tutorila anyPrevious: In a short space of time, he developed the notion of convergent operatorswhich remains a core of CFEngine.
The remaining options are treated as classes to be sent to all the hosts on the network.
Learn – CFEngine
tuotrial If not, file could be binary, refuse to edit. In particular it means that you don’t have to update multiple copies of a list of hosts. In other words, it can run standalone, as as part of a distributed system. Minutes tutoriak the hour in the form Min00, Min If we don’t, the declaration will be ignored.
You do this by adding a class name to one on the actions in action sequence by using a dot. Run cfengine from cron every hour on all your systems.
Clearly the first number must be less than the second to make a valid search expression. Disabling and the file repositoryPrevious: In the variable declaration, replace “cftesting” with your domain name:.
cfengine-Tutorial
By default, policies added to the server are executed once every 5 minutes by cf-agent. Afterall, itwouldbetragictospendmanyhourssettingupasystem by hand only to lose everything in an unfortunate disk crash a week or even a year later when you have forgotten what you had to do. You can use all of your carefully crafted groups tutirial user-defined classes to identify which host should run which programs.
To run the policy automatically — and, more importantly, on multiple machines — you should add it to the policy server. There is no particular advantage to doing this unless you are running cfengine on some very slow hardware. In other words, if you have a disk which is physically connected to host A, you would like to make the contents of that disk available to hosts B, C, D The locking mechanisms will protect you from silliness, See Deadlocks and runaway loops.
A netgroup is a list of hostnames or user names which are registered in the network information service NIS database under a specific name. Cfengine checks to see whether each of these filesystems is mounted and, if not, it builds the necessary directories, edits the necessary files and mounts the filesystems.
What is needed is a separate record of all of the patches required on all of the systems on the network; a record which can be compared to the state of each host at any time and which a suitable engine can use to fix any deviations from that reference standard.
CFEngine – Wikipedia
But this is, and you can run it to get familiar with Cfengine 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.
It consists of several components: If it is, Cfengine does nothing. Cfengine opens each matching directory and iterates the action over all directories which match. Set up cfd on all your systems so tutoria cfengine can be executed remotely, so that you can cfwngine “push” changes to all your hosts with cfrun.
The symbol designates a comment and means: For example, some administrators consider the finger service to be a threat to security and want to disable it.
Most configuration files are line-based text files, a fact which explains the popularity of, for example, the Perl programming language. Classes are dealt with in detail in the next chapter.
Automating System Administration with Cfengine 3: An Introduction
Cfengine incorporates a declarative language—much higher level than Perl or shell: Variables are referred to in either of two different ways, depending on your taste. To automate a system administration task cfenngine CFEngine, you should create a policy file for it.
Building flexible time classesNext: Classes works like this: Files and linksPrevious: Files can be deleted if they have not been accessed for n-days.
Cfengine runs regularly, bringing the system back to the correct state, or keeping it there.