@raouia What were the components on the deleted host? I don't quite understand "My cluster was composed of an ambari-server and 2 ambari-agents. I removed one node from ambari agents." Do you mean it was a 3 node cluster (1 master and 2 slaves) if so how was the component distributed? I am more concerned about the delete host? ... View more

@subhash parise Your Ambari is SSL enabled did you by chance also enable 2 ways SSL between Ambari Server and Ambari Agents? see doc Here is a HCC document that can also help you achieve that. Enable 2 way SSL between Ambari-Server and Ambari-agents in Ambari 2.5 Hope that helps ... View more

@raouia Could you attach the zookeeper logs in /var/log/zookeeper? You mean the zookeeper was running before did you restart it , that's when you realised it could start? Did you make any config changes through Ambari or not? Is it possible to get a longer stack trace of the error.png? Because the interesting part is missing. ... View more

@ilia kheifets I am positive it will work! And once it does don't forget to accept my answer. That way other HCC users can quickly find the solution when they encounter the same issue. Please let me know ... View more

@ilia kheifets Here we go all the services up and running without major issues !!! Did you install java with JCE? standard procedure? I have seen your comments but at times we ignore the obvious well-documented steps. I followed usual steps and all is up and running. As I have demonstrated that the procedure is OK and valid, this answered your question. ... View more

@Neha G If you have sudo privileges just do this you will need a valid kerberos ticket just realised you have a kerberized cluster $sudo su - hdfs List the correct principal for hdfs $ klist -kt /etc/security/keytabs/hdfs.headless.keytab Keytab name: FILE:/etc/security/keytabs/hdfs.headless.keytab KVNO Timestamp Principal ---- ------------------- ------------------------------------------------------ 1 08/24/2017 15:42:23 hdfs-cluster@YOUR_REALM Then grab a valid kerbero ticket $ kinit -kt /etc/security/keytabs/hdfs.headless.keytab hdfs-cluster@YOUR_REALM Then $ hdfs dfsadmin -safemode leave That should work now ! ... View more

subsequent screenshots ... View more

@ilia kheifets As promised I tried to recreate your environment on a 1 node cluster running Ubuntu 16.04 in a VM with 12 GB RAM.After the installations find below the high-level steps I performed. The Cluster is installing without any issues Generate public and private SSH keys on the Ambari Server host. root@ubuntu17:~# ssh-keygen Accepted default values,copy the SSH Public Key (id_rsa.pub) to the root account on your target hosts if multi-node. .ssh/id_rsa .ssh/id_rsa.pub Add the SSH Public Key to the authorized_keys file on your target hosts. root@ubuntu17:~# cat id_rsa.pub >> authorized_keys root@ubuntu17:~# chmod 700 ~/.ssh root@ubuntu17:~# chmod 600 ~/.ssh/authorized_keys Set NTPD root@ubuntu17:~# apt-get install ntp root@ubuntu17:~# update-rc.d ntp defaults Set the host FQDN in my case the Ambari server vi /etc/hosts ---- IP--FDN--ALIAS 192.168.0.172 ubuntu17.kenya.com ubuntu17 Edit host name root@ubuntu17:~# vi /etc/hostname ubuntu17.kenya.com Firewall settings root@ubuntu17:~# sudo ufw disable The program 'setenforce' is currently not installed.So I installed The program 'setenforce' is currently not installed.So I installed root@ubuntu17:~# apt install selinux-utils Disable SE-Linux root@ubuntu17:~# setenforce 0 Set UMASK root@ubuntu17:~# umask 0022 root@ubuntu17:~# echo umask 0022 >> /etc/profile Download Ambari repo files root@ubuntu17:~# wget -O /etc/apt/sources.list.d/ambari.list http://public-repo-1.hortonworks.com/ambari/ubuntu16/2.x/updates/2.5.2.0/ambari.list Grab the key root@ubuntu17:~# apt-key adv --recv-keys --keyserver keyserver.ubuntu.com B9733A7A07513CAD Update root@ubuntu17:~# apt-get update root@ubuntu17:~# apt-cache showpkg ambari-server root@ubuntu17:~# apt-cache showpkg ambari-agent root@ubuntu17:~# apt-cache showpkg ambari-metrics-assembly Install Java Openjdk comes with JCE root@ubuntu17:~# sudo apt-get install openjdk-8-jdk Install Ambari server here I used the root user root@ubuntu17:~# apt-get install ambari-server root@ubuntu17:~# ambari-server setup Setup as root user with default postgres databases root@ubuntu17:~# ambari-server start Ambari Server 'start' completed successfully. Get the FQDN for the ambari server root@ubuntu17:~# hostname -f ubuntu17.kenya.com So my Ambari URL will be http://ubuntu17.kenya.com:8080 See attached screenshot,got an error with THP so had to disable root@ubuntu17:~/.ssh# cat /sys/kernel/mm/transparent_hugepage/enabled [always] madvise never root@ubuntu17:~/.ssh# echo never > /sys/kernel/mm/transparent_hugepage/enabled root@ubuntu17:~/.ssh# echo never > /sys/kernel/mm/transparent_hugepage/defrag root@ubuntu17:~/.ssh# cat /sys/kernel/mm/transparent_hugepage/enabled always madvise [never] Setup Mysql database for hive ,oozie etc root@ubuntu17:~# sudo apt-get update root@ubuntu17:~# sudo apt-get install mysql-server root@ubuntu17:~# sudo mysql_secure_installation root@ubuntu17:~# apt-get install -y libpostgresql-jdbc-java root@ubuntu17:~# apt-get install libmysql-java root@ubuntu17:~# ls /usr/share/java/mysql-connector-java.jar Check that the mysql connector is present at that location root@ubuntu17:~# ls /usr/share/java/mysql-connector-java.jar Create the hive,oozie and ranger databases in Mysql with the correct privileges created database for hive successfully created database for oozie successfully created database for ranger successfully Run this command # ambari-server setup --jdbc-db=mysql --jdbc-driver=/usr/share/java/mysql-connector-java.jar Proceeded with the cluster installation http://ubuntu17.kenya.com:8080 See attached screenshots ... View more

@Neha G I think I have seen a typo error in your command can you copy and paste the below command sudo su - hdfs hdfs dfsadmin -safemode leave And let me know ... View more