An Ambari Stack for Redis

Ambari stack for easily installing and managing Redis on HDP cluster

###Assumptions

• Ambari is installed and running. If not, you can use sandbox VM Image provided by Hortonworks website
• No previous installations of Redis exist. If there any, you can either remove it or rename it.

Follow given step to install and manage Redis using Ambari.

####Connect to the VM via SSH (password hadoop for sandbox image) and start Ambari server

ssh root@ambari.machine

####To deploy the Redis, run below

cd /var/lib/ambari-server/resources/stacks/HDP/2.2/services
git clone https://github.com/nikunjness/redis-ambari.git   

####Restart Ambari #####on sandbox sudo service ambari restart

#####on non-sandbox sudo service ambari-server 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 Redis -> Next -> Next -> Next -> Deploy

####On successful deployment you will see the Redis 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 Redis

• Check the contents of the redis log file we specified

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

• Check status of Redis

# service redis status
redis-server (pid  8175) 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=REDIS
export PASSWORD=admin
export AMBARI_HOST="your_ambari_hostname"
export CLUSTER="your_ambari_cluster_name"

#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 Redis

• To remove the Redis:

  • Stop the service via Ambari

  • Delete the service

    curl -u admin:admin -i -H 'X-Requested-By: ambari' -X DELETE http://replace_with_your_ambari_hostname.com:8080/api/v1/clusters/ambari_cluster_name/services/REDIS
    

  • Remove artifacts

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

  • Restart Ambari

    service ambari restart
    

###References: https://github.com/abajwa-hw/ntpd-stack