question Re: ambari custom alert script in host_scripts is not populating to the agent cache after ambari server and agent restart in Support Questions

ambari custom alert script in host_scripts is not populating to the agent cache after ambari server and agent restart

fpaul — Thu, 21 Mar 2019 21:46:51 GMT

https://community.hortonworks.com/articles/38149/how-to-create-and-register-custom-ambari-alerts.html doesn't seems to be working with ambari 2.7.1, stuck at step 3)

No exception in ambari server or agent logs

@Jay Kumar SenSharma

Re: ambari custom alert script in host_scripts is not populating to the agent cache after ambari server and agent restart

jsensharma — Fri, 22 Mar 2019 12:43:38 GMT

@Franklin

Please try this:

1. On ambari agent host please find this script "/usr/lib/ambari-agent/lib/ambari_agent/CustomServiceOrchestrator.py" and then search for a string with 'if the return type is not used'

# grep -A2 'if the return type is not used' /usr/lib/ambari-agent/lib/ambari_agent/CustomServiceOrchestrator.py
        # if the return type is not used
        base_dir = self.file_cache.get_service_base_dir(command)
        script_path = self.resolve_script_path(base_dir, script)

2. Just add a new line on all agent hosts self.file_cache.get_host_scripts_base_dir(command) there as following Just below the commented line:

# grep -A2 'if the return type is not used' /usr/lib/ambari-agent/lib/ambari_agent/CustomServiceOrchestrator.py
        # if the return type is not used
        self.file_cache.get_host_scripts_base_dir(command)
        base_dir = self.file_cache.get_service_base_dir(command)
        script_path = self.resolve_script_path(base_dir, script)

**NOTE:** Python is Indentation sensitive so you will need to put the same indentation while adding the line there (else it might cause some syntax error)

3. Clear the Agent Cache Dir (or move it as backup)

# mv /var/lib/ambari-agent/cache /var/lib/ambari-agent/cache_OLD

4. Restart the ambari server and agent.

# ambari-server restart
# ambari-agent restart

5. Now check the host script dir if it has pulled file the custom scripts from ambari server host.

# ls -lart /var/lib/ambari-agent/cache/host_scripts/

Re: ambari custom alert script in host_scripts is not populating to the agent cache after ambari server and agent restart

fpaul — Fri, 22 Mar 2019 14:32:14 GMT

@Jay Kumar SenSharma, It resolves the issue

Re: ambari custom alert script in host_scripts is not populating to the agent cache after ambari server and agent restart

SaloniU — Tue, 17 Dec 2019 14:03:19 GMT

As the description mentions that nothing from /var/lib/ambari-server/resources is populated in agent cache, I see a behavior where custom dashboard files which are placed at /var/lib/ambari-server/resources/common-services/AMBARI_METRICS/0.1.0/package/files/grafana-dashboards/HDP/ are also not available in /var/lib/ambari-agent/cache/common-services/AMBARI_METRICS/0.1.0/package/files/grafana-dashboards/HDP/. How to make this work?