I have installed Java through some cookbook and have set some default variables, now I want to add some more variables (Application specific) through my cookbook. How can I do that through Recipes in Chef. I tried to pass some variables in setenv.sh but it is overriding the default values instead I want to merge the variables and override existing variable values.
My code in setenv.sh:
export JAVA_OPTS="$JAVA_OPTS -Xmx2048m"
where $JAVA_OPTS - default variables
First way to do it would be to update the attribute defining the bases values in your application cookbook, as the attributes are read before the recipes are evaluated your file would end up with the correct values.
You're not saying with which cookbook you're using so I'll base the example on the tomcat cookbook
This cookbook define an attribute default['tomcat']['java_options'] = '-Xmx128M -Djava.awt.headless=true'
The easiest way it to complement this by using something like
default['tomcat']['java_options'] = "#{default['tomcat']['java_options']} -Xmx2048m"
The obvious problem is that you end up with 2 -Xmx values, usually the JVM will take the latest but it become hard to find what options is at which value when there's a lot of overwriting.
Second option is to take advantage of jvmargs cookbook wich gives helpers functions to deine the java options and use in your setenv.sh template at end.
Related
I am using the Config crate in Rust, and would like to use environment variables to set keys inside a section of the config. The end goal is to override application settings from a docker compose file, or docker command line, using the environment.
If my config was the following, could I use a specifically crafted environment variable to set database.echo ?
(code blurb below is taken from this example)
debug = true
[database]
echo = true
The example code to configure this using the environment variables illustrates only to set keys at the top level. Wondering how to extend this. The .set() takes a hierarchical key, so I'm hopeful that there's a way to encode the path in the env variable name.
Answering my own question.
I just noticed that the Environment code accepts a custom separator which will get replaced with . (dot).
So one can set the separator to something like _XX_ and that would get mapped to a ".". Setting DATABASE_XX_ECHO=true, for instance would then change the database.echo key.
part question. First, how do I configure the size of a branch predictor?
I can see that I can set the type using the se.py config script and the --bp-type argument. (In my case I'm setting it to LTAGE), but how do I change the size of the tables? And is there an easy way to see the total size of all tables?
My second part, is looking at the code, I don't understand the LTAGE constructor:
LTAGE::LTAGE(const LTAGEParams *params)
: TAGE(params), loopPredictor(params->loop_predictor)
{
}
The LTAGEParams doesn't appear to be defined anywhere except here:
LTAGE*
LTAGEParams::create()
{
return new LTAGE(this);
}
How can I see what all the members of LTAGEParams are?
About the size, have a look at m5out/config.ini after running a simulation, it contains all SimObject parameters.
In the case of branch predictors, all Python-visible parameters of each implemented predictor will be defined in its respective class declaration at src/cpu/pred/BranchPredictor.py. They also inherit the parameters of their base class. For example, LTAGE has all the parameters of the TAGE class - out of which the tage object is re-assigned to be an instance of LTAGE_TAGE - and a new parameter, loop_predictor, which is a LoopPredictor instance.
You can then just set any of the values in that file from your Python config and they will be used (double check in config.ini after re-running).
The C++ constructor of SimObjects takes a param object like LTAGEParams and that object is autogenerated from the corresponding Python SimObject file, and passes values from Python configs to C++ using pybind11.
gem5 has a lot of code generation, so whenever you can't find a definition, grep inside the build directory. This is also why I recommend setting up Eclipse inside the build directory: How to setup Eclipse IDE for gem5 development?
SimObject autogeneration is described further at: https://cirosantilli.com/linux-kernel-module-cheat/#gem5-python-c-interaction
So in the website for the plugin, the change-log for Version 0.61 (Mar 30, 2016) mentions that they have exposed Jenkins and project bindings for use in a groovy script. I'm currently trying to set a parameter (multi select) and i want it to have different options based on the value of another parameter which is set before this one in the Jenkins job. However i'm not able to get the value of that other parameter in the script.
My problem is very similar to the one explained here
I've tried using ${param}, $(param), $param, bindings.variables.get('param') in the script, and none of it works
I've also tried to set that parameter in the Variable bindings section of the script but still no success.
Any ideas about the correct way to obtain the value?
I set the variable binding as param on the other field that you want to dynamically populate and used param (please note that i didnt use $ ${} or binding.get etc). It worked for me.
As a side note, Will active choice reactive parameter work in your case?
I am looking for specific instructions on how to override default values in a third party cookbook. For example, i am using apache_spark cookbook (https://github.com/clearstorydata-cookbooks/apache_spark)
And i want to override the attribute
default['apache_spark']['standalone']['master_host']
I tried it my making a main recipe, in which i add
node.default['apache_spark']['standalone']['master_host'] = 'foo.com'
And execute it using chef solo like:
run_list(
'recipe[main]',
'recipe[apache_spark::spark-standalone-worker]'
)
But that does not seem to work. Any suggestions on how it needs to be done?
My main recipe is here https://github.com/Vibhuti/chef-main
The correct fix would be to make a wrapper cookbook and set your values in the cookbook's attributes file (main/attributes/default.rb):
override['apache_spark']['standalone']['master_host'] = 'foo.com'
Also make sure you add a dependency in main's metadata.rb to force the load ordering to be correct:
depends 'apache_spark'
Any environment variable prefixed with "FACTER_" is automatically added to the facter collection. I've successfully added a "FACTER_" environment variable it is indeed showing up in the facter -p list, so it should be able to be used by puppet...
The problem, though, is in my .pp file the variable name that should be set to the FACTER_ value is empty (or non existant)
Is there something else I need to do to get FACTER_ variables into puppet variables?
Cheers
You are most likely setting up the system so that the FACTER_ variables are available in interactive shells. This is not sensible if you want your background agent to respect them.
I can see two direct approaches:
Modify your initscript or its configuration to set the appropriate environment variables.
Forego the approach entirely and use /etc/facter/facts.d instead.
I would advise towards the latter.