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How to Setup Kubernetes on DigitalOcean with CoreOS
Kubernetes on DigitalOcean with CoreOS
Let's look at an example of how to launch a Kubernetes cluster from scratch on DigitalOcean, including kubeadm, an Nginx Ingress controller, and Letsencrypt certificates.
Overview
Environment
We'll be creating a four-node cluster (k8s-master, k8s-000...k8s-002), load balancer, and ssl certificates.
Currently, there is an explosion of tools that aim to manage secrets for automated, cloud native
infrastructure management. Daniel Somerfield did some work classifying the various approaches,
but (as far as I know) no one has made a recent effort to summarize the various tools.
This is an attempt to give a quick overview of what can be found out there. The list is alphabetical.
There will be tools that are missing, and some of the facts might be wrong--I welcome your corrections.
For the purpose, I can be reached via @maxvt on Twitter, or just leave me a comment here.
This is by far the most recommended way of writing resources for all users. There are two gotchas which we're working through:
For helper functions that you used to write in your provider code or used to mixin to your provider code, you have to use an action_class do ... end block.
For this configuration you can use web server you like, i decided, because i work mostly with it to use nginx.
Generally, properly configured nginx can handle up to 400K to 500K requests per second (clustered), most what i saw is 50K to 80K (non-clustered) requests per second and 30% CPU load, course, this was 2 x Intel Xeon with HyperThreading enabled, but it can work without problem on slower machines.
You must understand that this config is used in testing environment and not in production so you will need to find a way to implement most of those features best possible for your servers.
There are many different provisioning tools out there, the most popular of which are Chef and Puppet. Chef uses Ruby, Puppet uses a DSL (Domain Specific Language), there are others that use simple bash too, but today we're going to focus on Chef Solo.
2. Dependencies
To get Chef working properly on your local machine you need a few things.
Make sure you use Ruby 1.9.x and not Ruby 2.x as you will get errors with the json 1.6.1 gem on 2.x.
Use rbenv or RVM to manage several different Rubies on the one machine.
like unix better,deploy rails application with unicorn + nginx <br/>
the tour base on guanxi_cms
Unicorn: Rack HTTP server for fast clients and Unix
Unicorn is an HTTP server for Rack applications designed to only serve fast clients on low-latency, high-bandwidth connections and take advantage of features in Unix/Unix-like kernels. Slow clients should only be served by placing a reverse proxy capable of fully buffering both the the request and response in between Unicorn and slow clients.
Features
Designed for Rack, Unix, fast clients, and ease-of-debugging. We cut out everything that is better supported by the operating system, nginx or Rack.
Compatible with both Ruby 1.8 and 1.9. Rubinius support is in-progress.
Process management: Unicorn will reap and restart workers that die from broken apps. There is no need to manage multiple processes or ports yourself. Unicorn can spawn and manage any number of worker processes you choose to scale to your backend.
Load balancing is done entirely by the operating system kernel. Requests never pile up behind a bus
Print the methods of Jenkins inner object on script console
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