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launch of ambari services getting failed with alerts

when i do localhost:8080, the services are not getting started.. and lots of alerts are popped up for the first time.Please let me know the solution ton resolve this.


Super Mentor

@Divya Thaore

YARN is not running because "HDFS" service is not running hence yarn startup operation is not able to connect to HDFS hence we see the following error:

 curl: (7) Failed connect to; Connection refused 000 stdout: <br>2019-01-06 11:13:50,127 - Stack Feature Version Info: Cluster Stack=2.6, Command Stack=None, Command Version= -> 2019-01-06 11:13:50,234 - Using hadoop conf dir<br>

curl: (7) Failed connect to; Connection refused 


The best thing will be to try starting services in this sequence:

1. Start Zookeeper

2. Start HDFS

3. Start MapReduce/Yarn

4. Start HBase.


Also please check how much memory do you have free on your Sandbox? (Sandbox requires at least 8GB of Dedicated RAM)

# free -m


@Jay Kumar SenSharma

My system Ram is : 8GB and I have allocated 4GB to sandbox.. Also the free memory structure is attached. Please suggest do I need to increase my system Ram or create a new VM with 8gb..? What will be recommended for smooth running and learning ????


Super Mentor

@Divya Thaore

As you mentioned that your system total RAM is: 8GB and you have allocated 4GB to sandbox.


Sandbox Minimum Requirement: In order to run components without issue, Minimum 8GB RAM you should have dedicated on your 64 bit OS to run the Sandbox without any issue. Less RAM allocation might cause a very slow startup of Sandbox and might cause Hung Or Network Service failure.

Example: If your Laptop has 16GB RAM then you can allocate 8GB to your Sandbox VM to use it properly.