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From Christopher Jackson <jackson.christopher....@gmail.com>
Subject Re: Checking installed services.
Date Thu, 10 Dec 2015 00:47:15 GMT
Thanks Bhuvnesh,

I was actually already doing something similar to what you suggested:

has_knox = 'topology' in config['configurations’]

I was hoping there was a way that felt less hackish. 

Regards,

Christopher Jackson

> On Dec 9, 2015, at 5:37 PM, Bhuvnesh Chaudhary <bchaudhary@pivotal.io> wrote:
> 
> Hello Christopher,
> 
> You can check the key clusterHostInfo and examine its content if they have any component
for Knox (knox_gateway_hosts). In params.py you can probably use the below.
> config = Script.get_config()
> config['clusterHostInfo']
> 
> Example of config['clusterHostInfo'] with knox during start of the component.
> 
> {'snamenode_host': ['c6402.ambari.apache.org <http://c6402.ambari.apache.org/>'],
'nm_hosts': ['c6402.ambari.apache.org <http://c6402.ambari.apache.org/>', 'c6403.ambari.apache.org
<http://c6403.ambari.apache.org/>', 'c6401.ambari.apache.org <http://c6401.ambari.apache.org/>'],
'app_timeline_server_hosts': ['c6402.ambari.apache.org <http://c6402.ambari.apache.org/>'],
'hawqsegment_hosts': ['c6401.ambari.apache.org <http://c6401.ambari.apache.org/>'],
'all_ping_ports': ['8670', '8670', '8670'], 'rm_host': ['c6402.ambari.apache.org <http://c6402.ambari.apache.org/>',
'c6401.ambari.apache.org <http://c6401.ambari.apache.org/>'], 'all_hosts': ['c6402.ambari.apache.org
<http://c6402.ambari.apache.org/>', 'c6403.ambari.apache.org <http://c6403.ambari.apache.org/>',
'c6401.ambari.apache.org <http://c6401.ambari.apache.org/>'], 'slave_hosts': ['c6402.ambari.apache.org
<http://c6402.ambari.apache.org/>', 'c6403.ambari.apache.org <http://c6403.ambari.apache.org/>',
'c6401.ambari.apache.org <http://c6401.ambari.apache.org/>'], 'all_racks': ['/default-rack',
'/default-rack', '/default-rack'], 'all_ipv4_ips': ['192.168.64.102', '192.168.64.103', '192.168.64.101'],
'hs_host': ['c6402.ambari.apache.org <http://c6402.ambari.apache.org/>'], 'knox_gateway_hosts':
['c6401.ambari.apache.org <http://c6401.ambari.apache.org/>'], 'hawqmaster_hosts': ['c6403.ambari.apache.org
<http://c6403.ambari.apache.org/>'], 'namenode_host': ['c6401.ambari.apache.org <http://c6401.ambari.apache.org/>'],
'pxf_hosts': ['c6402.ambari.apache.org <http://c6402.ambari.apache.org/>', 'c6403.ambari.apache.org
<http://c6403.ambari.apache.org/>', 'c6401.ambari.apache.org <http://c6401.ambari.apache.org/>'],
'ambari_server_host': ['c6401.ambari.apache.org <http://c6401.ambari.apache.org/>'],
'zookeeper_hosts': ['c6402.ambari.apache.org <http://c6402.ambari.apache.org/>', 'c6403.ambari.apache.org
<http://c6403.ambari.apache.org/>', 'c6401.ambari.apache.org <http://c6401.ambari.apache.org/>'],
'hawqstandby_hosts': ['c6402.ambari.apache.org <http://c6402.ambari.apache.org/>']}
> 
> Thanks,
> Bhuvnesh Chaudhary
> Email: bchau <mailto:bchaudhary@gopivotal.com>dhary@pivotal.io <mailto:dhary@pivotal.io>

> Desk: +1-650-846-1696 | Mobile: +1-973-906-6976
> 
> On Wed, Dec 9, 2015 at 12:53 PM, Christopher Jackson <jackson.christopher.lee@gmail.com
<mailto:jackson.christopher.lee@gmail.com>> wrote:
> Hi All,
> 
> Does the core ambari.resource.management python scripts provide any mechanism for checking
if a given service is installed? For instance how would I go about setting a flag whether
or not Knox is installed in the params.py file for a custom service?
> 
> Regards,
> Christopher Jackson
> 


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