I really thought this was going to solve it.
I
- created user:group gmond:gmond.
- granted gmond sudo NOPASSWD on /usr/sbin/rndc
- edited the Popen to prepend a 'sudo' to the '/usr/sbin/rndc' call
To test, I su - gmond and ran the script as a unit test successfully.
Just to prove that these were valid steps, I removed the 'sudo' prefix
to the Popen call which caused the script to crash -readded, and was
able to run as a test as gmond once again.
Just to reiterate too, the metric_init is definitely being callled.
I've even combed through the strace a few times
After doing lots of python things like reads and mmaps on python
modules and builtins, it parses named.stats via a read call....then a
few brk's(can't remember what this syscall is) and then it's off doing
it's own built-in metrics seemingly never to return to my python
things.
brk(0x9a08000) = 0x9a08000
read(5, "+++ Statistics Dump +++ (1228912"..., 139264) = 139264
read(5, "4)\n+++ Statistics Dump +++ (1229"..., 4096) = 1089
read(5, "", 4096) = 0
close(5) = 0
munmap(0xb7ce3000, 4096) = 0
brk(0x9a29000) = 0x9a29000
brk(0x9a4a000) = 0x9a4a000
brk(0x9a6b000) = 0x9a6b000
gettimeofday({1229082545, 192223}, NULL) = 0
fstat64(4, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb7ce3000
write(4, "LastRecord (1229082545.1922231, "..., 213) = 213
getdents(3, /* 0 entries */, 4096) = 0
close(3) = 0
gettimeofday({1229082545, 195632}, NULL) = 0
open("/proc/stat", O_RDONLY)
On Fri, Dec 12, 2008 at 6:07 AM, Brad Nicholes <[email protected]> wrote:
> I haven't tried to actually run your module yet, but can this be a
> permissions problem. What user are you running gmond as? Does that user
> have permissions to run rndc and access named.stats? All modules run by
> gmond will be run as the same user as gmond. Therefore you have to make sure
> that the user that gmond is running as, has sufficient permissions to perform
> any work being done by the modules.
>
> Brad
>
>
>>>> On 12/12/2008 at 4:24 AM, in message
> <[email protected]>, "David
> Birdsong"
> <[email protected]> wrote:
>> I'm having the same exact problem. I can run the if __name__ ==
>> '__main__' test and have the script define and execute the callbacks
>> via the descriptor list, but when running from gmond, all that gets
>> called is the metric_init()
>>
>> I put an open in the init and set the open filename to global as a
>> test because I thought maybe I couldn't rely on STDOUT from inside the
>> hanlder. Only the metric_init writes to it depite my putting a file
>> write in the handler.
>>
>> Any clue on why it's gmond's initializing but not calling the handler
>> in the module?
>>
>> Heres' my pyconf:
>> modules {
>> module {
>> name = "dns"
>> language = "python"
>> }
>> }
>>
>> collection_group {
>> collect_every = 20
>> time_threshold = 45
>> metric {
>> name = "zDNS_success"
>> title = "Temperature"
>> value_threshold = 10
>> }
>>
>> metric {
>> name = "zDNS_nxrrset"
>> title = "Temperature"
>> value_threshold = 10
>> }
>>
>> metric {
>> name = "zDNS_referral"
>> title = "Temperature"
>> value_threshold = 10
>> }
>>
>> metric {
>> name = "zDNS_nxdomain"
>> title = "Temperature"
>> value_threshold = 10
>> }
>>
>> metric {
>> name = "zDNS_recursion"
>> title = "Temperature"
>> value_threshold = 10
>> }
>>
>> metric {
>> name = "zDNS_failure"
>> title = "Temperature"
>> value_threshold = 10
>> }
>>
>> metric {
>> name = "zDNS_duplicate"
>> title = "Temperature"
>> value_threshold = 10
>> }
>>
>> metric {
>> name = "zDNS_dropped"
>> title = "Temperature"
>> value_threshold = 10
>> }
>>
>>
>> }
>>
>>
>> ###### Here's my python module:
>> #!/usr/bin/python
>>
>>
>> import re
>> import sys
>> import time
>> import subprocess
>>
>> NamePrefix = 'zDNS'
>> LastRecord = {}
>> MaxAge = 30
>> descriptors = []
>>
>> out_file = ''
>>
>> def return_collection_data(collection_string):
>> global NamePrefix
>> collection_date_re = re.compile(r'^.*\(([0-9]+)\)$')
>> collection = filter(lambda x: x, collection_string.split('\n'))
>> collection_date = collection_date_re.search(collection.pop()).group(1)
>>
>> collection_map = {}
>> for record in collection:
>> name, value = record.split()
>> name = '%s_%s' % (NamePrefix, name)
>> collection_map[name] = int(value)
>>
>> return (int(collection_date), collection_map)
>>
>> def return_latest_record():
>>
>> collections_splitter_re =
>> re.compile(r'^\+\+\+\sStat.*Dump\s\+\+\+\s\([0-9]+\)$', re.MULTILINE)
>> cmd = ['/usr/sbin/rndc', 'stats']
>> x = subprocess.Popen(cmd)
>> r_code = x.wait()
>> if r_code != 0 :
>> print >> sys.stderr, 'bad things happened calling %s ' % cmd
>> print >> sys.stderr, 'need to throw and catch an exception'
>>
>> f = '/var/named/named.stats'
>> collections = collections_splitter_re.split(open(f).read())
>> collections = map(lambda x: x.strip(), collections)
>> foo = {}
>> for collection in collections:
>> collection = collection.strip()
>> if not collection: continue
>> collection_date, collection_data = return_collection_data(collection)
>> foo[collection_date] = collection_data
>> k = foo.keys()
>> k.sort()
>> return (time.time(), foo[k.pop()])
>>
>> def named_stats_handler(value):
>> global LastRecord
>> global MaxAge
>> global out_file
>>
>> out_file.write('in handler name %s \n' % value)
>> timestamp, data = LastRecord
>> if time.time() - timestamp > MaxAge: timestamp, data =
>> return_latest_record()
>> LastRecord = (timestamp, data)
>> out_file.write('Current Record %s\n' % LastRecord.__str__())
>> out_file.flush()
>> return data[value]
>>
>> def metric_init(params):
>> global descriptors
>> global NamePrefix
>> global LastRecord
>> global out_file
>>
>> out_file = open('/tmp/ganglia_david', 'w')
>> LastRecord = return_latest_record()
>> out_file.write('LastRecord %s\n' % LastRecord.__str__())
>> out_file.flush()
>> descriptors = [
>>
>> { 'name' : '%s_success' % NamePrefix,
>> 'call_back': named_stats_handler,
>> 'time_max': 60,
>> 'value_type': 'uint32',
>> 'units': 'ticks',
>> 'slope': 'positive',
>> 'format': '%u',
>> 'description': 'Successful Queries',
>> 'groups': NamePrefix
>> },
>> { 'name' : '%s_nxrrset' % NamePrefix,
>> 'call_back': named_stats_handler,
>> 'time_max': 60,
>> 'value_type': 'uint32',
>> 'units': 'ticks',
>> 'slope': 'positive',
>> 'format': '%u',
>> 'description': 'Dunno',
>> 'groups': NamePrefix
>> },
>> { 'name' : '%s_referral' % NamePrefix,
>> 'call_back': named_stats_handler,
>> 'time_max': 60,
>> 'value_type': 'uint32',
>> 'units': 'ticks',
>> 'slope': 'positive',
>> 'format': '%u',
>> 'description': 'DNS Forwards',
>> 'groups': NamePrefix
>> },
>> { 'name' : '%s_nxdomain' % NamePrefix,
>> 'call_back': named_stats_handler,
>> 'time_max': 60,
>> 'value_type': 'uint32',
>> 'units': 'ticks',
>> 'slope': 'positive',
>> 'format': '%u',
>> 'description': 'No RR in Zones',
>> 'groups': NamePrefix
>> },
>> { 'name' : '%s_recursion' % NamePrefix,
>> 'call_back': named_stats_handler,
>> 'time_max': 60,
>> 'value_type': 'uint32',
>> 'units': 'ticks',
>> 'slope': 'positive',
>> 'format': '%u',
>> 'description': 'Recursive Queries',
>> 'groups': NamePrefix
>> },
>> { 'name' : '%s_failure' % NamePrefix,
>> 'call_back': named_stats_handler,
>> 'time_max': 60,
>> 'value_type': 'uint32',
>> 'units': 'ticks',
>> 'slope': 'positive',
>> 'format': '%u',
>> 'description': 'SERV Fail',
>> 'groups': NamePrefix
>> },
>> { 'name' : '%s_duplicate' % NamePrefix,
>> 'call_back': named_stats_handler,
>> 'time_max': 60,
>> 'value_type': 'uint32',
>> 'units': 'ticks',
>> 'slope': 'positive',
>> 'format': '%u',
>> 'description': 'dunno',
>> 'groups': NamePrefix
>> },
>> { 'name' : '%s_dropped' % NamePrefix,
>> 'call_back': named_stats_handler,
>> 'time_max': 60,
>> 'value_type': 'uint32',
>> 'units': 'ticks',
>> 'slope': 'positive',
>> 'format': '%u',
>> 'description': 'Client went away',
>> 'groups': NamePrefix
>> }
>> ]
>> return descriptors
>>
>> def metric_cleanup():
>> '''Clean up the metric module.'''
>> global out_file
>> out_file.close()
>> # pass
>>
>> #This code is for debugging and unit testing
>> if __name__ == '__main__':
>> metric_init(None)
>> for d in descriptors:
>> v = d['call_back'](d['name'])
>> print 'value for %s is %u' % (d['name'], v)
>>
>>
>>
>> On Thu, Dec 11, 2008 at 10:58 PM, Bernard Li <[email protected]> wrote:
>>> Hi Guolin:
>>>
>>> On Thu, Dec 11, 2008 at 4:46 PM, Guolin Cheng <[email protected]> wrote:
>>>
>>>> Then I setup the config mytest.pyconf and copy it to under
>>>> /etc/ganglia/conf.d/, and copy the python script to under
>>>> /usr/lib64/ganglia/python_modules/ as well. At last I fire up gmond
>>>> again.
>>>
>>> It might help for us to have a look at your mytest.pyconf and mytest.py.
>>>
>>> Which version of Ganglia are you using?
>>>
>>> Cheers,
>>>
>>> Bernard
>>>
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>>
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