question Re: Problem during Ambari Confirm Hosts in Support Questions

Problem during Ambari Confirm Hosts

marka_thorson — Tue, 23 Feb 2016 23:51:46 GMT

I am trying to add two more hosts to my existing cluster (only has one right now) but I am running into errors during the Ambari step - Confirm Hosts. The error message is shown below. It says it failed because it finished with a non zero exit code. What does this mean and how can I fix it? I have followed the steps to configure passwordless ssh but I may have done something incorrectly. I have replace the host name with a bunch of x's.

==========================
Creating target directory...
==========================


Command start time 2016-02-23 10:45:50


Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
SSH command execution finished
host=xxxxxxxxxxxxxxxxxxxxx, exitcode=255
Command end time 2016-02-23 10:45:51


ERROR: Bootstrap of host xxxxxxxxxxxxxxxxxxxx fails because previous action finished with non-zero exit code (255)
ERROR MESSAGE: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).


STDOUT: 
Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).

Re: Problem during Ambari Confirm Hosts

aervits — Tue, 23 Feb 2016 23:55:21 GMT

@Mark Thorson

make sure permissions on the public key are set as per the documentation. You can also manually install the ambari agent. Copy the ambari.repo file from a working machine to this machine and put in /etc/yum.repos.d/

double check that server is set to ambari server in /etc/ambari-agent/ambari-agent.ini

then ambari-agent start and try your registration process again.

https://docs.hortonworks.com/HDPDocuments/Ambari-2.2.0.0/bk_ambari_reference_guide/content/ch_amb_ref_installing_ambari_agents_manually.html

Re: Problem during Ambari Confirm Hosts

nsabharwal — Tue, 23 Feb 2016 23:58:14 GMT

@Mark Thorson

This is related to your ssh keys

Make sure that you test this

ssh localhost

if it asks for password then

cd ~/.ssh

cat id_rsa.pub >> authorized_keys

ssh localhost

Re: Problem during Ambari Confirm Hosts

nsabharwal — Wed, 24 Feb 2016 00:00:50 GMT

This can save you lot of time http://docs.hortonworks.com/HDPDocuments/Ambari-2.2.0.0/bk_Installing_HDP_AMB/content/_set_up_password-less_ssh.html

you can set up the ssh keys between ambari server and new nodes

You can use this in case you dont want to setup ssh keys

http://docs.hortonworks.com/HDPDocuments/Ambari-2.1.0.0/bk_ambari_reference_guide/content/_install_the_ambari_agents_manually.html

Its for 2.1.0 and same for 2.2.0

Re: Problem during Ambari Confirm Hosts

Shelton — Wed, 24 Feb 2016 00:35:12 GMT

@Mark Thorson

On the Ambari server as root

cd ./ssh

cat id_rsa.pub >> authorized_keys

then copy the authorized_keys to the .ssh/ directory on 2 remote hosts you want to add to your cluster.

Validate from the Ambari server that the password less setup is working on the first attempt it will ask for the password thats normal buy subsequently it shouldn't ask for the ambari root password .

Apart from that the are a couple of checks on the client to add to the cluster eg Firewall,NTP ;SeLinux etc check this doc attached

Re: Problem during Ambari Confirm Hosts

marka_thorson — Sun, 18 Aug 2019 12:32:20 GMT

I noticed I hadn't set up passwordless ssh between the two I am setting up and that helped but now there's another error. The servers I have are not configured for DNS (will be soon) and are only accessible via IP address. Would this be a factor during setup?

Below xxxxxx(#) represents the FQDN and the specific server its referencing in parentheses

Re: Problem during Ambari Confirm Hosts

nsabharwal — Wed, 24 Feb 2016 00:58:31 GMT

@Mark Thorson Yes, please do not use IP for the host config. You can levergae /etc/hosts but I suggest to wait for the DNS

Re: Problem during Ambari Confirm Hosts

nsabharwal — Wed, 24 Feb 2016 09:27:00 GMT

@Mark Thorson How did it go?

Re: Problem during Ambari Confirm Hosts

marka_thorson — Wed, 24 Feb 2016 09:31:14 GMT

Still waiting on the DNS to be set up. I will update once work has been completed and I try adding the nodes.

Re: Problem during Ambari Confirm Hosts

marka_thorson — Wed, 24 Feb 2016 21:13:40 GMT

DNS has been configured but I still got an error message. One of the nodes I got the initial error I posted and the other I got the second error. What do you mean by leverage the /etc/hosts? @Neeraj Sabharwal

Re: Problem during Ambari Confirm Hosts

nsabharwal — Wed, 24 Feb 2016 21:19:41 GMT

@Mark Thorson

Make sure that you modify the ambari.ini for agents to point to correct ambari server. Link

/etc/ambari-agent/conf/ambari-agent.ini has ambari server address

Re: Problem during Ambari Confirm Hosts

marka_thorson — Wed, 24 Feb 2016 21:26:59 GMT

Alright sounds good. Just to confirm the hostname I should enter would be the server Ambari is running on? Also would the hostname be the FQDN or the DNS name of the server? @Neeraj Sabharwal

Re: Problem during Ambari Confirm Hosts

aervits — Wed, 24 Feb 2016 21:37:31 GMT

look at this http://docs.hortonworks.com/HDPDocuments/Ambari-2.2.1.0/bk_Installing_HDP_AMB/content/_edit_the_host_file.html

Re: Problem during Ambari Confirm Hosts

marka_thorson — Wed, 24 Feb 2016 21:49:45 GMT

I had success during the "confirm hosts" stage for one of the servers. During the install I received the attached error message stating it requires fuse but I am unsure what this is. @Neeraj Sabharwal

ambari-install-error.txt

Re: Problem during Ambari Confirm Hosts

marka_thorson — Wed, 24 Feb 2016 22:14:14 GMT

I have seen that file before and just double checked to ensure all the servers are in the list.

Re: Problem during Ambari Confirm Hosts

marka_thorson — Wed, 24 Feb 2016 23:28:09 GMT

I retried the install and the error message did not appear this time. I was able to set up one of the two new servers with a couple warnings.

I tried to manually install the other server the same way but am getting a blank error message just stating the registration failed. When I look at the repolist something doesn't seem right here. It doesn't look like the table shown in the reference guide. @Neeraj Sabharwal

hadoop-support-ambari.jpg

Registering with the server...
Registration with the server failed.

Re: Problem during Ambari Confirm Hosts

nsabharwal — Wed, 24 Feb 2016 23:55:26 GMT

@Mark Thorson Let me confirm

1) You are installing ambari server in one of the nodes

2) You are manually installing agent in all the nodes

I won't worry about table yet.

You should go ahead and do the install

yum install ambari-server

and yum install ambari-agent --> in all nodes

Re: Problem during Ambari Confirm Hosts

marka_thorson — Sun, 18 Aug 2019 12:32:12 GMT

@Neeraj Sabharwal Yeah that is correct. I have installed Ambari Server on 1 node and Ambari Agent on all 3. The image below is the 3rd server. When I attempt to perform manual registration for this server I get an error message saying the code below.

Registering with the server...
Registration with the server failed.

Re: Problem during Ambari Confirm Hosts

nsabharwal — Thu, 25 Feb 2016 00:42:13 GMT

@Mark Thorson Good news!!! 🙂 We have agent there already

modify ini file and add ambar server address then ambari-server start

Re: Problem during Ambari Confirm Hosts

marka_thorson — Sun, 18 Aug 2019 12:32:04 GMT

@Neeraj Sabharwal To confirm you mean the ini file on the machine running Ambari Server? I previously had the 3 servers listed in the ini file. Does Ambari Server require a restart after they have been added?