SSH keys are encouraged but password authentication can also be used where needed by supplying the option --ask-pass.

By default, Ansible 1.3 and later will try to use native OpenSSH for remote communication when possible. This enables ControlPersist (a performance feature), Kerberos, and options in ~/.ssh/config such as Jump Host setup. However, when using Enterprise Linux 6 operating systems as the control machine (Red Hat Enterprise Linux and derivatives such as CentOS), the version of OpenSSH may be too old to support ControlPersist. On these operating systems, Ansible will fallback into using a high-quality Python implementation of OpenSSH called ‘paramiko’. If you wish to use features like Kerberized SSH and more, consider using Fedora, OS X, or Ubuntu as your control machine until a newer version of OpenSSH is available for your platform – or engage ‘accelerated mode’ in Ansible

OpenStack software controls large pools of compute, storage, and networking resources throughout a datacenter, managed through a dashboard or via the OpenStack API.

Racktables is a nifty and robust solution for datacenter and server room asset management. It helps document hardware assets, network addresses, space in racks, networks configuration and much much more!

The console running tmux has 5 available windows; their contents are described in the table below, along with keyboard shortcuts used to access them. Note that the keyboard shortcuts are two-part: first press Ctrl+b, then release both keys, and press the number key for the window you want to use

Ceph can run with a cluster containing thousands of Object Storage Devices (OSDs). A minimal system will have at least two OSDs for data replication. To configure OSD clusters, you must provide settings in the configuration file. Ceph provides default values for many settings, which you can override in the configuration file. Additionally, you can make runtime modification to the configuration using command-line utilities.

While it is possible to write a playbook in one very large file (and you might start out learning playbooks this way), eventually you’ll want to reuse files and start to organize things.

OpenNebula Front-end connects to the hypervisor Hosts using SSH. You must distribute the public key of oneadmin user from all machines to the file /var/lib/one/.ssh/authorized_keys in all the machines.

In order to improve the response time of the core daemon, it caches the most recently used data so it reduces the number of queries to the DB. Note that this prevents an active-active HA configuration for OpenNebula.

The GUI for advanced and cloud users as well as system administrators.

t basically assigns a physical host, and a storage area to each VM.

It is the main orchestration component, supervises the life-cycle of each resources (e.g. hosts, VMs or networks) and operates on the physical infrastructure to deploy and manage virtualized resources.

We will be using the classical active-passive cluster architecture which is the recommended solution for OpenNebula.

Some OpenNebula components need Ruby libraries. OpenNebula provides a script that installs the required gems as well as some development libraries

kube-controller-manager is a binary that runs controllers, which are the background threads that handle routine tasks in the cluster

The New Way is to deploy containers based on operating-system-level virtualization rather than hardware virtualization.

Our goal is to foster an ecosystem of components and tools that relieve the burden of running applications in public and private clouds.

best-of-breed

These interactive tutorials let you manage a simple cluster and its containerized applications for yourself.

Mix critical and best-effort workloads in order to drive up utilization and save even more resources.

on-premise

Automated container deployment, scaling, and management

Production-Grade Container Orchestration

We’ll walk you through Puppet installation and show you how to automate some basic tasks that sysadmins regularly perform.

The first step of building a reliable, useful and successful cloud is to decide a clear design.