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/$VERSION/services/NTPD-DEMO
sudo service ambari restart
- Then you can click on 'Add Service' from the 'Actions' dropdown menu in the bottom left of the Ambari dashboard:
On bottom left -> Actions -> Add service -> check NTPD service -> Next -> Next -> Next -> Deploy
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On successful deployment you will see the NTPD service as part of Ambari stack and will be able to start/stop the service from here:
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You can see the parameters you configured under 'Configs' tab
Use ntpd service
- Check the contents of the ntpd log file we specified
# cat /var/log/ntpd.log
Starting ntpd: [ OK ]
- Use ntpd service
# service ntpd status
ntpd (pid 9180) is running...
- One benefit to wrapping the component in Ambari service is that you can now monitor/manage this service remotely via REST API
export SERVICE=NTPD
export PASSWORD=admin
export AMBARI_HOST=sandbox.hortonworks.com
export CLUSTER=Sandbox
#get service status
curl -u admin:$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:
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Stop the service via Ambari
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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
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