The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".
The following errata were submitted by our customers and approved as valid errors by the author or editor.
Version |
Location |
Description |
Submitted By |
Date submitted |
Date corrected |
Printed, PDF |
Page ix
4th paragraph |
"the tutorial the CFEngine never had" should be "the tutorial that CFEngine never had"
Fixed.
|
![Diego Zamboni](http://cdn.oreillystatic.com/images/people/weblogs/diego_zamboni.jpg) Diego Zamboni |
Mar 21, 2012 |
Oct 16, 2013 |
Printed, PDF |
Page ix
4th paragraph |
"the tutorial the CFEngine never had" should be "the tutorial that CFEngine never had".
Fixed.
|
![Diego Zamboni](http://cdn.oreillystatic.com/images/people/weblogs/diego_zamboni.jpg) Diego Zamboni |
Mar 21, 2012 |
Oct 16, 2013 |
PDF |
Page 1
top code sample |
In this code sample
bundle type name(arguments)
{
promise_type:
class_expression:
promise
...
}
class_expression should end with "::" not only ":"
I think this is a syntax error, but I'm learning as I'm reading ;)
Note from the Author or Editor: Thank you for the report, this is indeed a syntax error. I have fixed it.
|
Laurent Raufaste |
Apr 26, 2012 |
Oct 16, 2013 |
|
2
,3. CFEngine Basics > CFEngine Policy Structure>classes and decision making |
cf-promises -v | grep Defined
Does not return any thing at all to me when i am using CFEngine Core 3.5.0b2.0887729
however i can check classes greping for "class" and i can see some hard, soft, and global classes
Note from the Author or Editor: Thank you Walid, indeed the output changed in CFEngine 3.5.0. For the upcoming new edition of the book, I have changed the command to "grep classes", which works on all versions of CFEngine.
Thank you for your report.
|
Walid Shaari |
May 25, 2013 |
Oct 16, 2013 |
PDF, Other Digital Version |
Page 4
4th paragraph |
The brief description of Puppet says that it is written in Python. According to the project website[1] Puppet is written in Ruby.
[1] http://docs.puppetlabs.com/guides/faq.html#why-is-puppet-written-in-ruby
Kind regards,
Grant
Note from the Author or Editor: Confirmed and fixed. Thanks for catching it!
|
Grant Hammond |
Dec 11, 2011 |
Oct 16, 2013 |
PDF |
Page 17
Step 4 |
It's not clear here that cf-agent will recognise its own address when bootstrapping and set itself up as a policy hub. However, this is stated on page 59.
Note from the Author or Editor: Thank you for the report. I have added a note clarifying this.
|
Anonymous |
Jun 30, 2013 |
Oct 16, 2013 |
PDF |
Page 19
first command block |
After creating the example motd cf-snippet it is advised to run "cf-agent.exe".
Suggestion:
- highlight differences between Windows and Unix Cfengine so the user is able to pick the correct executable
or
- ignore Windows completely / defer until later since the typical usage scenario is probably UNIX/Linux centric. Windows is kind of
an advanced topic.
additional suggestion: Rewrite the first example(s) so it/they may run without elevated privileges? Since the user is 'Learning CFEngine3' it may be nice to avoid accidentally breaking the system.
Note from the Author or Editor: Good catch! Leftover from a time when I was editing the book on a Windows machine and copy-pasted the commands. Fixed.
|
Yoothahv |
Jan 13, 2012 |
Oct 16, 2013 |
PDF |
Page 21
bottom quarter / bullet points |
Current: "Make sure process httpd is/is not running"
Suggestion: "Make sure process httpd is (not) running"
The is/is alternation is a confusing unless one considers the next word and re-parses the sentence accordingly.
Note from the Author or Editor: Good suggestion, fixed.
|
Yoothahv |
Jan 13, 2012 |
Oct 16, 2013 |
PDF |
Page 28
top quarter |
- not equal
The cfengine snippet for editing the sshd configuration is NOT equivalent to the previously given shell script.
If there already is a line "AllowRoot yes", "AllowRoot<tab>no" or any other deviation then "AllowRoot no" will be added by cfengine and corrupt the config file.
Suggestion:
a) Use replace_or_add(pattern,line) instead? <http://cfengine.com/manuals/CfengineStdLibrary.html#bundle-edit_005fline-replace_005for_005fadd>
b) Use a different example? (e.g. /etc/modules)
- regex tweaks
Additionally the shell script could be changed a little in order to avoid changing commented lines. (Maybe ".*" was intended to swallow leading whitespace?)
sed -i 's/.*AllowRoot .*/AllowRoot no/;'
->
sed -i 's/^AllowRoot .*/AllowRoot no/;'
(Tabs are not matched with this regex. I would include them in production grade code, for an example it may be better to stick to simple cases.)
- syntax error
AllowRoot is not a valid keyword (OpenSSH 5.9). Did you mean "PermitRootLogin" instead?
Note from the Author or Editor: Re: not equal - correct, I have changed the example to use replace_or_add().
Re: regex tweaks - the .* is intended exactly to catch commented-out lines, with the intention of uncommenting and modifying them to the desired value instead of appending a new line at the end. This behavior is intended.
Re: syntax error. Thanks for the catch. I have corrected it, and also "EnableDNS", which should be "UseDNS".
|
Yoothahv |
Jan 13, 2012 |
Oct 16, 2013 |
PDF |
Page 30
Bottom of page, last word in text on page 30. |
"Synonyms" misspelled as "synonims."
Note from the Author or Editor: Fixed.
|
Mack Rhinelander |
Jan 22, 2012 |
Oct 16, 2013 |
Printed, PDF, ePub, Mobi, , Other Digital Version |
Page 32
"Not shown in this example is the set_config_values() bundle, which is part of the CFEngine Standard Library" |
Need clarification about CFEngine Standard Library. Only at page 66 you recommend to download the latest version of library. For beginners who uses old version of CFEngine (my is 3.2.4) it isn't clear why provided example does not work.
So need to move note about CFEngine Standard Library at least to page 32 from page 66. Or even specify at the very beginning of the book which version of CFEngine Core and COPBL was used in examples. I know that COPBL hasn't versions (hey, it really should! ;) because it's almost impossible to find which snapshot of COPBL repository included in specific CFEngine Core release) so you can specify which exactly package/tarball you used for examples.
Thanks.
Note from the Author or Editor: Thank you for the report. I have added some clarification to the first mention of the stdlib.
|
alex |
Oct 25, 2012 |
Oct 16, 2013 |
Printed |
Page 33
3rd paragraph (excluding "tips" and "code") |
"This snippet uses the grep command to determine if the file **alredady** contains the PermitRootLogin string..."
(emphasis mine around typo)
Note from the Author or Editor: Thank you, will fix.
|
Christina Plummer |
Nov 18, 2013 |
|
PDF |
Page 34
the last paragraph (above the example) |
"For integers, CFEngine sup-
ports .... the
prefixes K, M and G to represent powers of 2 (that is, 1024, etc.)"
In fact, from the example "i3" uses suffix, rather than prefixes as described here.
Note from the Author or Editor: Thank you, I have fixed the text in the next edition of the book.
|
Yen-Wei Liu |
Mar 17, 2013 |
Oct 16, 2013 |
PDF |
Page 35
2nd Paragraph |
Found in epub version but that is not a selectable option.
In reference to CFEngine Nova "it also includes man convenience features, such as native support for databse" As of 3.3.0 "Database promises, which allow to maintain schema of MySQL and
PostgreSQL databases. Database promises are in "technical preview"
status: this promise type is subject to change in future." https://github.com/cfengine/core/blob/master/ChangeLog
Note from the Author or Editor: I have updated this paragraph and other references throughout the book to reflect the recent changes.
|
Nick Anderson |
Mar 23, 2012 |
Oct 16, 2013 |
Printed |
Page 36
3rd paragraph |
The explanation of the "policy" attribute in a variable declaration is confusing; an example here would help. Does "policy" apply to all vars in a bundle, or is it defined per variable? If the latter, what is the syntax?
Note from the Author or Editor: Will clarify.
|
Christina Plummer |
Nov 18, 2013 |
|
Printed |
Page 37
first code block, and corresponding output |
Both examples of a MULTILINE string use "multine" instead of "multiline":
this
is a
multine string
Note from the Author or Editor: Thank you, will fix.
|
Christina Plummer |
Nov 18, 2013 |
|
ePub |
Page 40
example with ifvarclass and @(words) list |
Is'n clear why exactly class "darwin" is defined. Is this machine where example was run has hostname "darwin"? So this is hard class and it will be defined.
"Here is output on a Mac" -- why class "apple" isn't defined then? (I don't have mac to check, but I suppose that instead of hard class "linux" on Linux machines,hard class "apple" will be defined on Mac's).
As for beginner it was really hard to understand behavior of this example. Could you please clarify something in example's description?
Thanks.
Note from the Author or Editor: Thank you for your report. I have added some clarification and removed the class "apple" which causes confusion. The class "darwin" is defined on Macs because the core OS is Darwin: http://en.wikipedia.org/wiki/Darwin_(operating_system)
|
alex |
Oct 25, 2012 |
Oct 16, 2013 |
Printed, PDF, ePub, Mobi, , Other Digital Version |
Page 42
description of additional agent promises in commercial editions of CFEngine |
* services: to configure Windows system services
While "services" used in the text above (for community edition of CFEngine) it will be better to say something like:
* services: additionaly has class "windows" to configure Windows system services
Note from the Author or Editor: Fixed.
|
alex |
Oct 25, 2012 |
Oct 16, 2013 |
PDF |
Page 42
Example after first paragraph |
class_expression: should be class_expression::
There are two colons after a class expression in cfengine.
Note from the Author or Editor: Fixed.
|
Paul Dejean |
Nov 02, 2012 |
Oct 16, 2013 |
Printed |
Page 43
bottom of page, cf-agent run example |
The code example defines @(words) with the following list members:
"chair", "darwin", "table", "linux"
But the output of the cf-agent run that should be iterating over $(words) implies the following list members instead:
"darwin", "apple", "table", "linux"
This was confusing.
Note from the Author or Editor: Thank you, will fix.
|
Christina Plummer |
Nov 18, 2013 |
|
Printed |
Page 50
4th paragraph (files: code block) |
This code block doesn't seem to work. I get a syntax error on "edit_lines" - I thought perhaps it was a typo and should be "edit_line". But after making that change I got this error:
"Undefined bundle insert_lines with type edit_line"
I was able to get it to work when I added the following bundle, but I'm not sure if that's what you had in mind:
bundle edit_line insert_lines(line) {
insert_lines: "$(line)";
}
Note from the Author or Editor: Thank you - indeed "edit_lines" should be "edit_line". The "undefined bundle" is fixed by including the standard library, which is where the insert_lines bundle is defined. I will add a clarification about this.
|
Christina Plummer |
Nov 18, 2013 |
|
PDF |
Page 79/80
code snippets |
In the first code snippet the field is named "gecos" but in the second one it is referenced as "fullname".
Technical issue: I think this example has a serious flaw. If a user exists but has a differing configuration then as far cfengine is concerned this promise is kept. This may or may not be intentional so it should at least be mentioned.
Note from the Author or Editor: The gecos/fullname issue has been fixed.
About the technical issue mentioned, the behavior is intentional, and mentioned in a "warning" note in the description.
|
Yoothahv |
Jan 16, 2012 |
Oct 16, 2013 |
Printed |
Page 85
Bottom code block , line marked with "1" |
I believe "$(configfiles.files[sshdconfig])" should be
"$(configfiles.files[sshd])".
When I look at the bundle configfiles above, I see the "sshd" array used for setting the desired values - I don't see "sshdconfig" anywhere.
Note from the Author or Editor: Yes, this is a mistake. Thanks for reporting it!
|
Christina Plummer |
Dec 04, 2013 |
|
PDF |
Page 135
code of the bundle agent configfiles |
Hi,
with cfengine 3.4.4, I needed to change the files: section of configfiles5.cf to be
files:
"$($(id)[$(allfiles)]).original"
comment => "Ensure we have a backup of previous versions of $(allfiles)",
copy_from => backup_local_cp("$($(id)[$(allfiles)])");
e.g. $(allfiles) to be $($(id)[$(allfiles)]).
Thanks for your excellent book.
Note from the Author or Editor: Of course, you are correct. I have fixed the examples. Thank you for your report!
|
YP |
May 21, 2013 |
Oct 16, 2013 |
Printed |
Page 139
13 |
Small typo: "the bar calss is defined" should be "the bar class is defined"
Note from the Author or Editor: Thank you for the report- fixed.
|
Lo?c Pefferkorn |
Aug 07, 2012 |
Oct 16, 2013 |
Printed |
Page 142
line 11 |
a missing "e":
"it might be easir" => "it might be easier"
Note from the Author or Editor: Fixed.
|
Loic Pefferkorn |
Aug 29, 2012 |
Oct 16, 2013 |
Printed |
Page 142
line 25 |
3rd paragraph (or line 25)
missing "e":
"to differenciate betwen them" => "to differenciate between them"
Note from the Author or Editor: Fixed - thanks for the report.
|
Loic Pefferkorn |
Aug 29, 2012 |
Oct 16, 2013 |
Printed |
Page 162
top |
My first edition dead tree version has no index! IMO that's a serious problem, as one reason I love ORA books is awesome indexes.
(I talked to Diego about this a while ago, and I know why it's missing. I'm creating this because I think it *is* a serious problem and I wanted to get it on the record.)
Note from the Author or Editor: I agree. At some point I will create the index myself.
|
![JP Vossen](http://cdn.oreillystatic.com/images/people/weblogs/jp_vossen.jpg) JP Vossen |
Jan 02, 2013 |
Oct 16, 2013 |