Installing HPE Ezmeral Data Fabric (formerly MapR) version 7.x on a 12-node Linux cluster requires planning and configuration. Here are the detailed steps to install and configure the cluster:

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Step 1: Prerequisites

1. System Requirements:
   • 64-bit Linux (RHEL/CentOS 7 or 8, or equivalent).
   • Minimum hardware for each node:
     • Memory: At least 16GB RAM.
     • CPU: Quad-core or higher.
     • Disk: Minimum of 500GB of storage.
2. Network Configuration:
   • Assign static IP addresses or hostnames to all 12 nodes.
   • Configure DNS or update /etc/hosts with the IP and hostname mappings.
   • Ensure nodes can communicate with each other via SSH.
3. Users and Permissions:
   • Create a dedicated user for HPE Ezmeral (e.g., mapr).
   • Grant the user passwordless SSH access across all nodes.
4. Firewall and SELinux:
   • Disable or configure the firewall to allow required ports.
   • Set SELinux to permissive mode:

sudo setenforce 0

sudo sed -i ‘s/^SELINUX=.*/SELINUX=permissive/’ /etc/selinux/config

5. Java Installation:
   • Install Java (OpenJDK 11 recommended):

sudo yum install java-11-openjdk -y

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Step 2: Download HPE Ezmeral Data Fabric Software

1. Obtain Software:
   • Download the HPE Ezmeral 7.x installation packages from the official HPE Ezmeral website.
2. Distribute Packages:
   • Copy the packages to all 12 nodes using scp or a similar tool.

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Step 3: Install Core Services

1. Install the Core Packages:
   • On each node, install the required packages:

sudo yum install mapr-core mapr-fileserver mapr-cldb mapr-webserver -y

2. Install Additional Services:
   • Based on your use case, install additional packages (e.g., mapr-zookeeper, mapr-nodemanager, etc.).

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Step 4: Configure ZooKeeper

1. Select ZooKeeper Nodes:
2. Choose three nodes to run the ZooKeeper service (e.g., node1, node2, node3).
3. Edit the ZooKeeper Configuration:
4. Update the ZooKeeper configuration file (/opt/mapr/zookeeper/zookeeper-<version>/conf/zoo.cfg) on the ZooKeeper nodes:

tickTime=2000

dataDir=/var/mapr/zookeeper

clientPort=2181

initLimit=5

syncLimit=2

server.1=node1:2888:3888

server.2=node2:2888:3888

server.3=node3:2888:3888

3. Initialize ZooKeeper:
   • On each ZooKeeper node, create a myid file:

echo “1” > /var/mapr/zookeeper/myid  # Replace with 2 or 3 for other nodes

4. Start ZooKeeper:

sudo systemctl start mapr-zookeeper

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Step 5: Configure the Cluster

1. Initialize the Cluster:
   • Run the cluster initialization command from one node:

/opt/mapr/server/configure.sh -C node1,node2,node3 -Z node1,node2,node3

• Replace node1,node2,node3 with the actual hostnames of the CLDB and ZooKeeper nodes.

2. Verify Installation:
   • Check the cluster status:

maprcli cluster info

3. Add Nodes to the Cluster:
   • On each additional node, configure it to join the cluster:

/opt/mapr/server/configure.sh -N <cluster_name> -C node1,node2,node3 -Z node1,node2,node3

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Step 6: Start Core Services

1. Start CLDB:
   • Start the CLDB service on the designated nodes:

sudo systemctl start mapr-cldb

2. Start FileServer and WebServer:
   • Start the file server and web server services on all nodes:

sudo systemctl start mapr-fileserver

sudo systemctl start mapr-webserver

3. Start Node Manager:
4. If using YARN, start the Node Manager service on all nodes:

sudo systemctl start mapr-nodemanager

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Step 7: Post-Installation Steps

1. Access the Web Interface:
   • Open a browser and go to the web interface of your cluster:

http://<CLDB-node-IP&gt;:8443

• Log in using the mapr user credentials.

2. Add Storage:
   • Add storage disks to the cluster using the web interface or CLI:

maprcli disk list

maprcli disk add -all

3. Secure the Cluster:
   • Enable Kerberos or LDAP integration for authentication.
   • Configure SSL/TLS for secure communication.

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Step 8: Verify the Cluster

1. Check Services:
   • Verify that all services are running:

maprcli node list -columns svc

2. Run a Test:
3. Create a directory in the file system and test file creation:

hadoop fs -mkdir /test

hadoop fs -put /path/to/local/file /test