question Re: Clouderamanger web UI is blank in Archives of Support Questions (Read Only)

Clouderamanger web UI is blank

ehpgopal — Sun, 24 Jan 2016 20:33:32 GMT

Hi,

I have installed clouderamanger but web UI shows blank page.

please help me.

Re: Clouderamanger web UI is blank

michalis — Mon, 25 Jan 2016 16:55:30 GMT

Troubleshooting tip:

On the node where you have installed Cloudera Manager Server, check if it is actually running;

[linux shell]# service cloudera-scm-server status  
[linux shell]# /usr/java/jdk1.7.0_67-cloudera/bin/jcmd | grep "cmf.Main"
11082 com.cloudera.server.cmf.Main
...

Check if your CM is listening on port 7180

[linux shell]# if (exec 6<>/dev/tcp/$(hostname)/7180) 2> /dev/null; then echo "CM _IS_ listening on port 7180"; fi
 
[linux shell]# netstat -lntup | grep LIST
...
tcp        0      0 0.0.0.0:7180                0.0.0.0:*                   LISTEN      11082/java
...

If any of the above fails check your server log files

[linux shell]# less /var/log/cloudera-scm-server/cloudera-scm-server.log

> web UI shows blank page.

Are you behind proxy?

Re: Clouderamanger web UI is blank

ehpgopal — Mon, 25 Jan 2016 22:03:09 GMT

Hi Michelis,

I hope you are doing well. Thank you for looking into my issue.

I have cross verified service and listening ports,both are looking good.

Please check the below output. I am not using any proxy.

[root@cm ~]# /usr/java/jdk1.7.0_67-cloudera/bin/jcmd | grep "cmf.Main"
3986 com.cloudera.server.cmf.Main

[root@cm ~]# netstat -lntup | grep LIST
tcp        0      0 0.0.0.0:7432                0.0.0.0:*                   LISTEN      3138/postgres
tcp        0      0 0.0.0.0:7180                0.0.0.0:*                   LISTEN      3986/java
tcp        0      0 0.0.0.0:7182                0.0.0.0:*                   LISTEN      3986/java
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      1577/rpcbind
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      1803/sshd

Thank you,
Gopal

Re: Clouderamanger web UI is blank

ehpgopal — Mon, 25 Jan 2016 22:15:51 GMT

Hi Michelis,

Thank you for providing the support.

The problem is firefox browser. I have installed opera browser now it is working fine.

Operating System :- RHEL6

Regards
Gopal

Re: Clouderamanger web UI is blank

michalis — Mon, 25 Jan 2016 22:26:15 GMT

- What browser are you using, have you tried another browser?
- May I ask you try performing a tcpdump on your CM host?

1. Open a terminal (ssh/putty) into your CM Server host

2. # ifconfig | grep -B1 "inet "
...
eth0      Link encap:Ethernet  HWaddr DE:AD:BE:EF:DE:AD
          inet addr:10.17.81.7  Bcast:10.17.81.255  Mask:255.255.254.0
...

my host IP is "inet addr: 10.17.81.7" on interface eth0 
use these info for step 3. and 4.

3. # tcpdump -A -s 0 'tcp port 7180' -i eth0

4. Put side by side the terminal window and open your browser
url: http://[ip-of-your-cm]:7180/cmf/login 
- does your terminal window show any output/traffic?

Re: Clouderamanger web UI is blank

ehpgopal — Tue, 26 Jan 2016 17:58:52 GMT

Hi,

Thank you for the help.

the problem with the firefox browser. I have installed opera now it is
working fine.