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Deploy ERMR

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Jerome Fuselier edited this page Mar 14, 2017 · 1 revision

ERMR is deployed with Ansible, from a guest to a number of hosts. Ansible controls node configuration over SSH to connect to servers and run the configured tasks, you need to have an ssh access from the guest to the hosts. By default it assumes you are using SSH keys.

SSH configuration on the guest

Generating an SSH key

$ ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

Edit Config file

$ nano ~/.ssh/config

Host ermr
User indigo
Hostname %h
Compression yes
PreferredAuthentications publickey
IdentityFile ~/.ssh/id_rsa

VirtualBox Configuration

If you want to experiment on a local virtual machine (VM) using virtualbox for instance, this is the usual configuration I'm using:

  • Create a Host-ony Network in the VirtualBox settings (vboxnet0)
    • IPv4 address 192.168.56.1
  • Basic configuration with enough memory, 1 hard disk
  • Adapter 1 attached to NAT
  • Adapter 2 attached to Host-only adapter (vboxnet0) so Host and Guest can see each other on the 192.168.56.x network.

Hosts configuration

See configure_ubuntu.md for a more precise description of the steps for a ubuntu 14.04 guest.

Ansible Configuration

  • Create a host file for ansible (./inventory/staging for instance)
[indigo-databases]
ermr cassandra_interface=eth1 cassandra_seed_server=ermr

[indigo-webservers]
ermr

[indigo:children]
indigo-databases
indigo-webservers

  • Group variables in ./group_vars/all

    • cluster_name: the cluster name that will be used by all guests in Cassandra ring.
    • num_tokens: number of tokens that a given node will service.

  • Guest variables (This can also be defined in a file ./host_vars/hostname)

    • cassandra_interface: the network interface the guest will be using for Cassandra.
    • cassandra_seed_server: a comma-separated list of guests hostnames/ip that will be used as seeds for Cassandra. If you use hostnames this should be defined in /etc/hosts

  • You can choose if you want to activate the HTTPs mode in the ./webservers.yml file, with the https_mode variable.

Install everything

$ ansible-playbook deploy_standalone.yml -i inventory/staging --ask-become-pass

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