On-Premises (baremetal) Installation

For on-premises (bare-metal) installations, you will need to prepare for installation by:

  1. identifying a master host, from which you will run Karamel;
    1. the master must have a display for Karamel’s user interface;
    2. the master must be able to ping (and connect using ssh) to all of the target hosts.
  2. identifying a set of target hosts, on which the Hops software and 3rd party services will be installed.
    1. the target nodes should have http access to the open Internet to be able to download software during the installation process. (Cookbooks can be configured to download software from within the private network, by changing the ‘download_url’ chef attribute to a URL to a local http server IP address).

The master must be able to connect using SSH to all the target nodes, on which the software will be installed. If you have not already copied the master’s public key to the .ssh/authorized_keys file of all target hosts, you can do so by preparing the machines as follows:

  1. Create an openssh public/private key pair on the master host for your user account. On Linux, you can use the ssh-keygen utility program to generate the keys, which will by default be stored in the $HOME/.ssh/id_rsa and $HOME/.ssh/id_rsa.pub files. If you decided to enter a password for the ssh keypair, you will need to enter it again in Karamel when you reach the ssh dialog, part of Karamel’s Launch step.
  2. Create a user account USER on the all the target machines with full sudo privileges (root privileges) and the same password on all target machines.
  3. Copy the $HOME/.ssh/id_rsa.pub file on the master to the /tmp folder of all the target hosts. A good way to do this is to use pscp utility along with a file (hosts.txt) containing the line-separated hostnames (or IP addresss) for all the target machines. You may need to install the pssh utility programs (pssh), first.
$sudo apt-get install pssh
$yum install pssh

$vim hosts.txt
   # Enter the row-separated IP addresses of all target nodes in hosts.txt

$parallel-scp -h hosts.txt -P PASSWORD -i USER ~/.ssh/id_rsa.pub /tmp
$parallel-ssh -h hosts.txt -i USER -P PASSWORD mkdir -p /home/USER/.ssh
$parallel-ssh -h hosts.txt -i USER -P PASSWORD "cat /tmp/id_rsa.pub
       >> /home/USER/.ssh/authorized_keys && rm /tmp/id_rsa.pub"

Update your Karamel cluster definition file to include the IP addresses of the target machines and the USER account name. After you have clicked on the launch menu item, you will come to a Ssh dialog. On the ssh dialog, you need to open the advanced section. Here, you will need to enter the password for the USER account on the target machines (sudo password text input box). If your ssh keypair is password protected, you will also need to enter it again here in the keypair password text input box.

  1. Find out the network interface(s) on all servers:

These should be the same on all hosts. If they are not, you will need to add a new group in the Karamel cluster definition file for each different network interface. On each target machine, run: >ifconfig

  1. Set the correct hostname

Hops uses TLS/SSL certificates for security and we generate certificates for services such as Kafka. It is important that the common name (CN) in the certificate is the same as the hostname returned by the command line operation:


In ubuntu, the hostname returned by the ‘hostname’ command is in the file /etc/hostname

cat /etc/hostname

On ubuntu versions with support for systemd, you can set the hostname with:

hostnamectl set-hostname hadoop1

You also need to update the entries in /etc/hosts. For example, if you have an ubuntu machine with an old hostname in /etc/hosts:

grep '' /etc/hosts   vagrant1

You should remove this entry from /etc/hosts

If you decide to call your hosts ‘hadoop1..hadoopN’, then the hostname ‘hadoop1’ can be resolved to an IP address in /etc/hosts. This is our recommended way of resolving hostnames to IP addresses, rather than DNS which can be a source of problems if the DNS service is not working or slow or flakey.

grep hadoop1 /etc/hosts
>  hadoop1

#. Hosting installation files on the local network

Install an nginx server to the host deployment files for installation. Edit nginx’ port (do not use the default port 80, as it will clash with Hopsworks). Copy the installation fiiles to ‘/var/www/html/software’. On Ubuntu 16.04, run the following:

sudo apt-get install nginx
vi /etc/nginx/sites-available/default    # Set the port to '1111'
sudo mkdir /var/www/html/software
# Copy all the software to the folder: /var/www/html/software

When you install using Karamel, you should set the download url to be the URL of the nginx server and its software folder. Here is an example of part of a cluster.yml:

name: HopsworksBaremetal
    username: hops
  download_url: ""

#. Gmail Account setup

You will need to create a new gmail account which will be used for email notifications, such as validating new Hopsworks accounts (when a user registers a new account, he/she receives an email and needs to click on a link in the email to validate his/her email address).

You need to enable gmail to send emails using a SMTP server. By default, a gmail account used by Hopsworks will not be allowed to send emails. You need to enable the following: go into the gmail account settings and ‘allow less secure apps’:

Allow less secure apps: ON