An Ambari Stack for NTPD

Ambari stack for easily installing and managing NTPD on HDP cluster

Limitations:

• This is not an officially supported service and is not meant to be deployed in production systems. It is only meant for testing demo/purposes
• It does not support Ambari/HDP upgrade process and will cause upgrade problems if not removed prior to upgrade

Steps:

• Download HDP 2.2 sandbox VM image (Sandbox_HDP_2.2_VMware.ova) from Hortonworks website
• Import Sandbox_HDP_2.2_VMware.ova into VMWare and set the VM memory size to 8GB
• Now start the VM
• After it boots up, find the IP address of the VM and add an entry into your machines hosts file e.g.

192.168.191.241 sandbox.hortonworks.com sandbox    

• Connect to the VM via SSH (password hadoop) and start Ambari server

ssh root@sandbox.hortonworks.com
/root/start_ambari.sh

• To deploy the NTPD stack, run below

VERSION=`hdp-select status hadoop-client | sed 's/hadoop-client - \([0-9]\.[0-9]\).*/\1/'`
sudo git clone https://github.com/abajwa-hw/ntpd-stack.git /var/lib/ambari-server/resources/stacks/HDP/$VERSION/services/NTPD-DEMO

sudo service ambari restart

• Then you can click on 'Add Service' from the 'Actions' dropdown menu in the bottom left of the Ambari dashboard:

On bottom left -> Actions -> Add service -> check NTPD service -> Next -> Next -> Next -> Deploy

• On successful deployment you will see the NTPD service as part of Ambari stack and will be able to start/stop the service from here:

• You can see the parameters you configured under 'Configs' tab

Use ntpd service

• Check the contents of the ntpd log file we specified

# cat /var/log/ntpd.log
Starting ntpd: [  OK  ]

• Use ntpd service

# service ntpd status
ntpd (pid  9180) is running...

• One benefit to wrapping the component in Ambari service is that you can now monitor/manage this service remotely via REST API

export SERVICE=NTPD
export PASSWORD=admin
export AMBARI_HOST=sandbox.hortonworks.com
export CLUSTER=Sandbox

#get service status
curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X GET http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE

#start service
curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Start $SERVICE via REST"}, "Body": {"ServiceInfo": {"state": "STARTED"}}}' http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE

#stop service
curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Stop $SERVICE via REST"}, "Body": {"ServiceInfo": {"state": "INSTALLED"}}}' http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE

Remove ntpd service

• To remove the NTPD service:

  • Stop the service via Ambari

  • Delete the service

    curl -u admin:admin -i -H 'X-Requested-By: ambari' -X DELETE http://sandbox.hortonworks.com:8080/api/v1/clusters/Sandbox/services/NTPD
    

  • Remove artifacts

    rm -rf /var/lib/ambari-server/resources/stacks/HDP/2.2/services/ntpd-stack
    

  • Restart Ambari

    service ambari restart