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Propellor is a configuration management system using Haskell and Git. Each system has a list of properties, which Propellor ensures are satisfied.
The agent has various configuration options that can be specified via the command-line or via configuration files. All of the configuration options are completely optional. Defaults are specified with their descriptions.
The KV endpoint is used to access Consul's simple key/value store, useful for storing service configuration or other metadata.
We've started our first agent and registered and queried a service on that agent. This showed how easy it is to use Consul but didn't show how this could be extended to a scalable, production-grade service discovery infrastructure. In this step, we'll create our first real cluster with multiple members.
When a Consul agent is started, it begins without knowledge of any other node: it is an isolated cluster of one. To learn about other cluster members, the agent must join an existing cluster. To join an existing cluster, it only needs to know about a single existing member. After it joins, the agent will gossip with this member and quickly discover the other members in the cluster. A Consul agent can join any other agent, not just agents in server mode.
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ZooKeeper - A Reliable, Scalable Distributed Coordination System
Tuesday, July 15, 2008 at 12:45AM
ZooKeeper is a high available and reliable coordination system. Distributed applications use ZooKeeper to store and mediate updates key configuration information. ZooKeeper can be used for leader election, group membership, and configuration maintenance. In addition ZooKeeper can be used for event notification, locking, and as a priority queue mechanism. It's a sort of central nervous system for distributed systems where the role of the brain is played by the coordination service, axons are the network, processes are the monitored and controlled body parts, and events are the hormones and neurotransmitters used for messaging. Every complex distributed application needs a coordination and orchestration system of some sort, so the ZooKeeper folks at Yahoo decide to build a good one and open source it for everyone to use.
DMTF Redfish LogoScalability in today’s data center is increasingly achieved with horizontal, scale-out solutions, which often include large quantities of simple servers. The usage model of scale-out hardware is drastically different than that of traditional enterprise platforms, and requires a new approach to management.
Designed to meet the expectations of end users for simple, modern and secure management of scalable platform hardware, the DMTF’s Redfish is an open industry standard specification and schema that specifies a RESTful interface and utilizes JSON and OData to help customers integrate solutions within their existing tool chains.
Industry feedback has been incorporated into each work-in-progress release and previous versions of the standard have converged into Redfish 1.0.
Jinja2 is a modern and designer-friendly templating language for Python, modelled after Django’s templates. It is fast, widely used and secure with the optional sandboxed template execution environment
laybooks are Ansible’s configuration, deployment, and orchestration language. They can describe a policy you want your remote systems to enforce, or a set of steps in a general IT process.
If Ansible modules are the tools in your workshop, playbooks are your design plans.
Manage a cluster of Linux containers as a single system to accelerate Dev and simplify Ops.