After spending most of they day digging around and researching, I find
Puppet's immutable variables are keeping me from properly handling what I'm
trying to do, so I want to see if anyone else has some suggestions on how
to handle was I need to accomplish.
Goal: Ingest a CSV file provided by a user and generate a start / stop
script, dynamically, for every server in scope, based on CSV file.
CSV Format:
SERVER,start command
Example.
SERVERA, /usr/local/bin/prog start databasea
SERVERA, /usr/local/bin/prog start databaseb
SERVER1, /usr/local/bin/prog start database123
The basic design I had in mind for the manifest is to:
1. Read in the file as provided,
2. Convert <A>,<B> to downcase(A) => B
3. if $hostname == A
$my_server_script_lines = $my_hash[A][B]
file {
...
content => template("basic_start_script"),
}
4. Create a template that runs through the $my_server_script_lines to put
each start line under start) and under stop) after doing a substr
replacement of start for stop in B.
Code so far
include stdlib
$my_data = file("/home/me/database.csv")
$my_subst = downcase(split($my_data2,'[,\n]'))
$my_hash = hash($my_subst)
notice ($my_hash[SERVERA])
$ puppet apply --verbose test.pp
Info: Loading facts
*Notice: Scope(Class[main]): '/usr/local/bin/prog start databaseb'*
Notice: Compiled catalog for myhost.net in environment production in 0.16
seconds
Info: Applying configuration version '1484340247'
Notice: Applied catalog in 0.03 seconds
Here are the values of the variables as it processes through
$my_data = "SERVERA,/usr/local/bin/prog start databasea
SERVERA,/usr/local/bin/prog start databaseb
SERVERB,/usr/local/bin/prog start database123"
$my_subst = [servera, '/usr/local/bin/prog start databasea' , servera,
'/usr/local/bin/prog start databaseb' , serverb, '/usr/local/bin/prog start
database123' ]
$my_hash = {servera => '/usr/local/bin/prog start databaseb' , serverb =>
'/usr/local/bin/prog start database123' }
So I already know why the hash conversion dropped the "start databasea" for
the servera key, what I can't seem to figure out is how to have it convert
into a array of value pairs for a specific key.
{ servera => ['/usr/local/bin/prog start
databasea', '/usr/local/bin/prog start databaseb'], serverb =>
['/usr/local/bin/prog start database123'] }
I tried various iterations of .each to try to create and fill the array
pointed to by the hash, but Puppet doesn't permit that as it would be
changing an already assigned variable / hash.
I was able use the $my_subst variable in an erb template to create the
start/stop lines. It worked ok for the 3 line example above, but when I
got to dozens of servers / start lines being applied to hundreds of servers
on each check-in it soon killed the CPU in my master server as it ran
through a loop checking if $hostname == servername.
Is it possible to have Puppet handle parsing the data in $my_substr, or
even right from the raw file data to do the following?
1. Run through incoming data to fill start command array.
['/usr/local/bin/prog
start databasea', '/usr/local/bin/prog start databaseb']
2. Assign that to the array of key-pairs. { servera =>
['/usr/local/bin/prog start databasea', '/usr/local/bin/prog start
databaseb'], serverb => ['/usr/local/bin/prog start database123'] }
Thanks!
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