I have installed Ambari 3 days ago and was able to get the services HDFS, Yarn, Zookeeper running completely fine but today I got an error of Heartbeat lost for all 3 nodes .

[#1]

I have tried uninstalling and reinstalling Ambari-agent and conform that Ambari-agent is running on all three hosts with /etc/hosts file edited with IP address. How can I get back the heart beat of agents to contact with the server.

[#2]

Hi @Shraddha Singh ,

Can you please share the output of

tail -f /var/log/ambari-agent/ambari-agent.log

probably it wont be able to connect to Ambari-server due to some python vulnerability . refer to . : https://community.hortonworks.com/questions/222311/i-have-installed-ambari-3-days-ago-and-was-able-t...

Hope this helps

[#3]

Please find attached the screenshot of the result of command executed.

[#4 · Accepted solution]

Hi @Shraddha Singh,

There can be two reasons for this issue . you can fix out solutions by one by one

1) Solution 1 : https://community.hortonworks.com/articles/188269/javapython-updates-and-ambari-agent-tls-settings.h...

2) Solution 2: refer to : https://community.hortonworks.com/questions/120861/ambari-agent-ssl-certificate-verify-failed-certif...

sed -i 's/verify=platform_default/verify=disable/'/etc/python/cert-verification.cfg

Refer to . https://community.hortonworks.com/questions/138820/ambari-server-failing-to-communicate-with-ambari-...

Please accept answer as helpfull if it helped you.