question Re: I cant connect to ambari dashboard in Archives of Support Questions (Read Only)

I cant connect to ambari dashboard

kenya868 — Sun, 18 Aug 2019 04:15:47 GMT

Hi all,

i am new, and i have problems to log with ambari dashboard.

I am using VM of sandboox 2.2.4.2 and i have asigned 4 gb of RAM to VM. My friend used this ram and he doesnt problems.

I used puTTy for connect to my VM, with root 127.0.0.1 and port 2222.

I installed all, and when i try to connect to ambari dashboard i have "Loading" in the page (several hours) and i am not able to connect.

I prove the next:

i) ambari-server status-----> Running

ii) ambari-agent status------> Running

iii) service postgresql status---> Running

iv) Service iptables status------> Firewall not running

v) sestatus ---------------------> Disable

vi) netstat -pan | grep 8080 ---------------------> Listen port 8080

vii) ifconfig --------------> eth (10.0.2.15)--lo(127.0.01)----Running

viii) Prove in others navigators too (Mozilla, Internet Explorer, Chrome)

But my picture during hours is:

Can be the memory ram? or the navigator that block the ip? I dont know why this problem exist!

Thank you very much

Re: I cant connect to ambari dashboard

jsensharma — Wed, 04 Apr 2018 18:08:45 GMT

@Juan Gonzalez

This might happen mostly due to memory constraints.

I will suggest , stopping / killing some of the components running on the Sandbox (kill -9 $HIVE_SERVER2_PID) or some other service components like HBase and then restart the ambari server again to see if it works. You can access the browser console to access the terminal http://localhost:4200 or use the SSH (ssh -p 2222 root@localhost). Once you are able to access the ambari UI then you can either put those unwanted components in Maintenance Mode or increase the RAM.

Also please try using "Incognito Mode" of browser to avoid any browser caching issue.

If you notice any WARNING / ERROR in "/var/log/ambari-server/ambari-server.log" then please share.

Re: I cant connect to ambari dashboard

kenya868 — Wed, 04 Apr 2018 19:00:25 GMT

Thank you very much for your response,

when i try to access to http://127.0.0.1:4200 , i guess this is http://localhost:4200, i have message of You can not access this website , connection refused.

Sorry , because i have very little knowledge in networks!!

Thank you very much again!!

Re: I cant connect to ambari dashboard

jsensharma — Wed, 04 Apr 2018 19:24:38 GMT

@Juan Gonzalez

I just noticed that your Sandbox version is bit old "sandbox 2.2.4.2" so it might not have the 4200 (Web Terminal functionality).

In that case you will have to try killing those processes using terminal:

# ssh root@localhost -p 2222
Enter Password: hadoop

Re: I cant connect to ambari dashboard

kenya868 — Wed, 04 Apr 2018 20:23:18 GMT

I tried your command "ssh root@127.0.0.1 -p 2222" but i obtain message:

ssh: connect to host 127.0.0.1 port 2222: Connection refused

It is rare!

Thank you very much and sorry for the time!

Re: I cant connect to ambari dashboard

kenya868 — Wed, 04 Apr 2018 21:42:02 GMT

Sorry again,

i think that maybe i have problem in connection, because i cant enter to ambari dashboard and i cant conect with code because the error is "Connection refused",

I tried see log, but when i use "/var/log/ambari-server/ambari-server.log, i have message "Permission denied".

I dont understand!!

Thank you very much!!

Re: I cant connect to ambari dashboard

kenya868 — Thu, 05 Apr 2018 03:15:07 GMT

Hi, can someone help me please?

i cant enter to dashboard of ambari.

Thank you very much!!

Re: I cant connect to ambari dashboard

Shelton — Thu, 05 Apr 2018 03:23:02 GMT

@Juan Gonzalez

Did you run the below command at any stage ?

# ambari-admin-password-reset

If not please do it and retry usual default is admin/admin

Re: I cant connect to ambari dashboard

kenya868 — Thu, 05 Apr 2018 03:42:35 GMT

Thank you very much,

i am going to apply your command. I am repeat all the steps again!

Re: I cant connect to ambari dashboard

Shelton — Thu, 05 Apr 2018 03:49:35 GMT

@Juan Gonzalez

Here is a link to solutions with issue pertaining to sandboxes

Keep me posted

Re: I cant connect to ambari dashboard

kenya868 — Sun, 18 Aug 2019 04:15:39 GMT

Thank you very much for your help!

I running all again step by step, but now, not listen and i have message in navigator: "Unable to connect to Ambari Server. Confirm Ambari Server is running and you can reach Ambari Server from this machine."

I show capture with commands. I think is a problem of connection, not memory, but i dont understand why this problem.

Thank you very much again!

Re: I cant connect to ambari dashboard

kenya868 — Sun, 18 Aug 2019 04:15:31 GMT

Now, the port are listen, but the navigator is "Loading" and not enter in dashboard of ambari

I show other capture with commands, and i see that port 8080 is listen but port 2222 not, so, i dont understand.

I ejecuted your command but i obtain bash message.

Thank you very much!

Re: I cant connect to ambari dashboard

Shelton — Thu, 05 Apr 2018 05:35:28 GMT

@Juan Gonzalez

Don't ignore ...Yes memory is very important, you MUST have a minimum of 8GB to run a sandbox the more you have the better and that the hortonworks recommendation

Can you try these 2 curl commands to validate
Check Ambari status

curl -u admin:admin -G http://ambari_host:8080/api/v1/check

Desired output <?xml version="1.0"?><status> RUNNING</status>

Check HDFS status

curl -u admin:admin -H "X-Requested-by:ambari" -i -k -X GET http://<AMBARI_HOST>:8080/api/v1/clusters/<CLUSTER_NAME>/services/HDFS/

Remember to replace the ambari_host and cluster_name with your actual value your cluster name should be sandbox I think

Re: I cant connect to ambari dashboard

kenya868 — Sun, 18 Aug 2019 04:15:23 GMT

Thank you very much,i am learning very much!

I ejecuted your commands, and in second command wich clusterName is Sandbox, i have several alerts and i dont understand why this alerts. I show some captures with all commands and results.

And alerts in your second command,

Re: I cant connect to ambari dashboard

kenya868 — Sun, 18 Aug 2019 04:14:53 GMT

And three more captures with all alerts, sorry for the extension!

I wait for your answer!! Thank you very much!

Re: I cant connect to ambari dashboard

jsensharma — Thu, 05 Apr 2018 16:23:28 GMT

@Juan Gonzalez

Based on the API output we can see that the amabri server is running fine and responding to the rest calls.

So the Dashboard not loading issue might be related to the browser caching or from browser side. So as suggested earlier can you please try using "Incognito Mode" (Private Mode) of browser to avoid any browser caching issue.

Also regarding the Alerts , The alerts are mostly normal and usually shows the really situation based on the type of alert. (rarely they are fake/false).

When we invoke the "/api/v1/clusters/Sandbox" API then it will show all the alert destinations as a normal behavior. We can look at the individual alert to know why they are being triggered and if there is some attention required.

However in Sandbox where too many services are running ... hence due to resource limitation we usually see many alerts and hence in order to suppress alerts we can put the servives in Maintenance mode.

Example.

Ambari UI --> Mapreduce --> Service Actions --> Turn ON Maintenance Mode.

https://docs.hortonworks.com/HDPDocuments/Ambari-2.2.2.0/bk_Ambari_Users_Guide/content/_setting_maintenance_mode.html

Re: I cant connect to ambari dashboard

kenya868 — Sun, 18 Aug 2019 04:14:34 GMT

Thank you very much Jay, for your answer!

So, there is not problem in conexion, but then i have to close some services due to resource limitation. How can i make this action with code?. disable some services, or turn on maintenance mode for delete this alerts and enter in dashboard of ambari?

I read your link but help to put maintenance mode in ambari dashboard, but i cant enter in dashboard

I tried "Incognito mode", but the problem still appear:

Re: I cant connect to ambari dashboard

jsensharma — Thu, 05 Apr 2018 17:00:24 GMT

@Juan Gonzalez

To free up some resources we can try to kill some of the components and then once we are able to login to Ambari UI then based on the requirement we can start & stop the required services.

Like:

# free -m
# kill -9 `cat /var/run/hive/hive-server.pid`
# kill -9 `cat /var/run/hbase/hbase-hbase-master.pid`
# kill -9 `cat /var/run/hbase/hbase-hbase-regionserver.pid`

Then restart the ambari-server after checking the free memory.

# free -m
# ambari-server restart

Re: I cant connect to ambari dashboard

kenya868 — Sun, 18 Aug 2019 04:14:26 GMT

Sorry, in the capture attached, appear the memory after kill hive, but when i try kill hbase, appear :

Maybe, kill other service, but the memory used decrease after kill hive. I can try enter to dashboard now!

Re: I cant connect to ambari dashboard

Shelton — Thu, 05 Apr 2018 17:16:00 GMT

@Juan Gonzalez

Your memory is quite below the recommended size 8 GB, and why are you struggling and using an OLD sandbox 2.2.4.2?

If you want to turn on maintenance mode for some components here is the link to the snippets

https://community.hortonworks.com/articles/71199/how-to-manage-maintenance-mode-in-ambari-using-api.html