@Tom Burke And regarding the SSL related issue. You will need to make sure that you configure a truststore in ambari Server and import the LDAP/AD certificate to Ambari Server's truststore to fix the following message: Failed to connect to KDC - Failed to communicate with the Active Directory at ldaps://xxx.yyy.com:636: simple bind failed: xxx.yyy.com:636 . Please see: https://community.hortonworks.com/content/supportkb/148572/failed-to-connect-to-kdc-make-sure-the-servers-ssl.html ... View more

@Tom Burke Looks like the FQDN is not set correctly on your failing Node. Please run the following commands to verify if the FQDN is setup correctly? (hostname and FQDN are not same) # python<<<"import socket;print socket.getfqdn();" (OR) # hostname -f # hostname If you find a difference in the FQDN then please set the FQDN of your host correctly. You can find the details here about hostname and public_hostname: https://community.hortonworks.com/content/kbentry/42872/why-ambari-host-might-have-different-public-host-n.html ... View more

@Tom Burke I think everything is fine and i see no errors any more in the UI operational logs or in the ambari-agent logs. So it looks good to me. Do you still see any issue? ... View more

@Tom Burke Looks like ambari agent is already installed on your ambari server host. So just try to start it and then see it it is starting fine without any error. # ambari-agent start; tail -f /var/log/ambari-agent/ambari-agent.log . ... View more

@Tom Burke i meant to say on the host where the Agent registration is failing can you check from where Ambari 2.2.1.0 binaries are coming because we saw in your output as : http://public-repo-1.hortonworks.com/ambari/ubuntu14/2.x/updates/2.2.1.0 Ambari . Or can you please share the "ambari-agent.log" from the host where the agent setup is failing? "/var/log/ambari-agent/ambari-agent.log" ... View more

@Tom Burke Can you also please check on the agent host to know why it is referring to Old ambari version 2.2.1.0? May be on the problematic host you can try running this command to find out which version is it using? # dpkg --list | grep ambari . ... View more

@Tom Burke This time i do not see it is failing with the the previous error. But it is strange to see that you are planning to use too old Ambari 2.2.1.0 as i see your output as following: Get:1 http://public-repo-1.hortonworks.com/ambari/ubuntu14/2.x/updates/2.2.1.0 Ambari InRelease [3,187 B] . Is there any specific reason for choosing so old Ambari version? Latest ambari release is 2.7.3 . ... View more

@Tom Burke 1. Please make sure that the permission on these files are correct as following: # ls -lart /root/.ssh/ total 20 -rw-r--r--. 1 root root 409 Jul 21 2018 id_rsa.pub -rw-------. 1 root root 1679 Jul 21 2018 id_rsa . 2. Also please make sure that the id_rsa files are generated on the host after fixing the hostname. (if the host was having multiple hostname earlier then please regenerate the keys again) Also make sure to copy this public key to the mentioned hosts (and all cluster hosts) # ssh-copy-id -i ~/.ssh/id_rsa.pub root@ambari.example.com . 3. Also for a quick check if the passwordless SSH is setup already then you should be able to do SSH without entering password nexttime. # ssh root@ambari.example.com ... View more

@Wael Horchani Ideally the path should exist in HDP 2.6.5 as well. Example: [root@newhwx3 ~]# ls -ld /usr/hdp/current/oozie-client/libext drwxr-xr-x. 2 root root 6 May 11 2018 /usr/hdp/current/oozie-client/libext [root@newhwx3 ~]# ls -ld /usr/hdp/current/oozie-server/libext/ drwxr-xr-x. 2 root root 6 May 11 2018 /usr/hdp/current/oozie-server/libext/ [root@newhwx3 ~]# hdp-select | grep oozie oozie-client - 2.6.5.0-292 oozie-server - 2.6.5.0-292 . Can you please check if you have the Oozie package installed properly? # yum info oozie_2_6_5_0_292* If not installed properly then you can try reinstalling it as following # yum reinstall oozie_2_6_5_0_292* . Path to Oozie WAR: [root@newhwx3 ~]# locate oozie.war /usr/hdp/2.6.5.0-292/oozie/oozie.war /usr/hdp/2.6.5.0-292/oozie/webapps/oozie.war [root@newhwx3 ~]# ls -l /usr/hdp/2.6.5.0-292/oozie/webapps/oozie.war -rw-r--r--. 1 root root 0 May 11 2018 /usr/hdp/2.6.5.0-292/oozie/webapps/oozie.war . ... View more