Continental Innovates with Rancher and Kubernetes
Pgweb is a great solution for developers who need quick and secure access to PostgreSQL instances in Kubernetes.
This introduction to Vitess explains what Vitess is and how to get started with the database clustering tool on a Kubernetes cluster. Read more here.
Objective: In this article, we will walk through running a distributed, production-quality database setup managed by Rancher and characterized by stable persistence. We will use Stateful Sets with a Kubernetes cluster in Rancher for the purpose of deploying a stateful distributed Cassandra database.
-- Pre-requisites: We assume that you have a Kubernetes cluster provisioned with a cloud provider. Consult the Rancher resource if you would like to create a K8s cluster in Amazon EC2 using Rancher 2.
In this tutorial Rancher looks at the steps of building out a highly available WordPress deployment using Kubernetes and MySQL. Visit us to learn more.
MongoDB, the popular open source NoSQL database, has been in the news a lot recently—and not for reasons that are good for MongoDB admins. Early this year, reports began appearing of MongoDB databases being “taken hostage” by attackers who delete all of the data stored inside the databases, then demand ransoms to restore it. Security is always important, no matter which type of database you’re using. But the recent spate of MongoDB attacks makes it especially crucial to secure any MongoDB databases that you may use as part of your container stack.
Which databases provide the best performance when used with containers? That’s an important question for people seeking to make the most of containerized infrastructure. In this post, I take a look at some basic performance metrics for three relational databases—PostgreSQL, MySQL, and MariaDB—when they are run as containers.
-- Introduction For the purposes of my tests, I used the official container images available from Docker Hub to install and start the databases.
One of the key features of the Kubernetes integration in Rancher is the application catalog that Rancher provides. Rancher provides the ability to create Kubernetes templates that give users the ability to launch sophisticated multi-node applications with the click of a button. Rancher also adds the support of Application Services to Kubernetes, which leverage the use of Rancher’s meta-data services, DNS, and Load Balancers. All of this comes with a consistent and easy to use UI.
Apache Cassandra is a popular database technology which is gaining popularity these days. It provides adjustable consistency guarantees, is horizontally scalable, is built to be fault-tolerant and provides very low latency, (sub-millisecond) writes. This is why Cassandra is used heavily by large companies such as Facebook and Twitter. Furthermore, Cassandra uses application layer replication for its data which makes it ideal for a containerized environment. However, Cassandra, like most databases, assumes that database nodes are fairly static.
[Recently Rancher introduced the Rancher catalog, an awesome feature that enables Rancher users to one-click deploy common applications and complex services from catalog templates on your infrastructure, and Rancher will take care of creating and orchestrating the Docker containers for you.] Rancher catalog offers a wide variety of applications in its out of the box catalog, including glusterfs or elasticsearch, as well as supporting private catalogs. Today I am going to introduce a new catalog template I developed for deploying a MongoDB replicaset, and show you how I built it.
Visit us to learn more about using Ansible with Docker to deploy a Wordpress service on Rancher. For more tutorials and to request a demo, visit Rancher today.
The latest release of Docker Engine now supports volume plugins, which allow users to extend Docker capabilities by adding solutions that can create and manage data volumes for containers that need to manage and operate on persistent datasets.This is especially important for databases, and addresses one of the key limitations in Docker. Recently at Rancher we released Convoy, an open-source Docker volume driver that makes it simple to snapshot, backup, restore Docker volumes across clouds.
[Since the availability of Rancher’s Beta release a few weeks ago, I’ve been pretty excited about the new scheduling and service discovery capabilities in the platform. To help people understand the impact of these capabilities, today I’m going to show how to use these features to deploy a fully clustered and HA implementation of a Node.js application. I’m going to use ][Let’s Chat as our example application, It is an excellent ][open-source, Slack-like team chat application.
I have already talked about several ways to monitor docker containers and also using Prometheus to monitor Rancher deployments. However, until now it has been a manual process of launching monitoring agents on our various hosts. With the release of the Rancher beta with scheduling and support for Docker compose we can begin to make monitoring a lot more automated. In today’s post we will look at using Rancher’s new \“Rancher compose\” tool to bring up our deployment with a single command, using scheduling to make sure we have a monitoring agent running on every host, and using labels to isolate and present our metrics.
In my last post I showed you how to deploy a Highly Available Wordpress installation using Rancher Services, a Gluster cluster for distributed storage, and a database cluster based on Percona XtraDB Cluster. Now I’m going one step further and we are setting Gluster and PXC clusters using Rancher Services too. And now we are using new service features available on the beta Rancher release like DNS service discovery and Label Scheduling.
Recently Rancher provided a disk image to be used to deploy RancherOS v0.3 on Google Compute Engine (GCE). The image supports RancherOS cloud config functionality. Additionally, it merges the SSH keys from the project, instance and cloud-config and adds them to the rancher user.
Building The Setup In this post, I will cover how to use the RancherOS image on GCE to set up a MongoDB Replica Set. Additionally I will cover how to use one of the recent features of Rancher platform which is the Load Balancer.
Note: Rancher has come a long way since this was first published in June 2015. We’ve revised this post (as of August 2016) to reflect the updates in our enterprise container management service. Read on for the updated tutorial!
Rancher supports multiple orchestration engines for its managed environments, including Kubernetes, Mesos, Docker Swarm, and Cattle (the default Rancher managed environment). The Cattle environment is rich with features like stacks, services, and load balancing, and in this post, we’ll highlight common uses for these features.
A little over a month ago I wrote about setting up a Magento cluster on Docker using Rancher. At the I identified some short comings of Rancher such as its lack of support fot load-balancing. Rancher released support for load balancing and docker machine with 0.16, and I would like to revisit our Magento deployment to cover the use of load balancers for scalability as well as availability. Furthermore, I would also like to cover how the docker machine integration makes it easier to launch Rancher compute nodes directly from the Rancher UI.
Rancher Server has recently added Docker Machine support, enabling us to easily deploy new Docker hosts on multiple cloud providers via Rancher’s UI/API and automatically have those hosts registered with Rancher. For now Rancher supports DigitalOcean and Amazon EC2 clouds, and more providers will be supported in the future. Another significant feature of Rancher is its networking implementation, because it enhances and facilitates the way you connect Docker containers and those services running on them.
Recently I have been playing around with Riak and I wanted to get it running with Docker, using RancherOS and Rancher. If you’re not familiar with Riak, it is a distributed key/value store which is designed for high availability, fault tolerance, simplicity, and near-linear scalability. Riak is written in Erlang programming language and it runs on an Erlang virtual machine. Riak provides availability through replication and faster operations and more capacity through partitions, using the ring design to its cluster, hashed keys are partitioned by default to 64 partitions (or vnodes), each vnode will be assigned to one physical node as following: From Relational to Riak Whitepaper For example, if the cluster consists of 4 nodes: Node1, Node2, Node3, and Node4, we will count around the nodes assigning each vnode to a physical node until the all vnodes are accounted for, so in the previous figure, Riak used 32 partition with 4 node cluster so we get:
In the first part of this post, I created a full Node.js application stack using MongoDB as the application’s database and Nginx as a load balancer that distributed incoming requests to two Node.js application servers. I created the environment on Rancher and using Docker containers.
In this post I will go through setting up Rancher authentication with GitHub, and creating a webhook with GitHub for automatic deployments.
Rancher Access Control Starting from version 0.
So last week I finally got out from my “tech” comfort zone, and tried to set up a Node.js application which uses a MongoDB database, and to add an extra layer of fun I used Rancher to set up the whole application stack using Docker containers.
I designed a small application with Node, its only function is to calculate the number of hits on the website, you can find the code at Github
[Usman is a server and infrastructure engineer, with experience in building large scale distributed services on top of various cloud platforms. You can read more of his work at techtraits.com, or follow him on twitter @usman_ismailor on GitHub.]
Magento is an open-source content management system (CMS) offering a powerful tool-set for managing eCommerce web-sites. Magento is used by thousands of companies including Nike and Office Max. Today we are going to walk through the process of setting up a Magento cluster using Docker and Rancher on the Amazon Elastic Compute Cloud (EC2).
Hussein Galal is a Linux System Administrator, with experience in Linux, Unix, Networking, and open source technologies like Nginx, Apache, PHP-FPM, Passenger, MySQL, LXC, and Docker. You can follow Hussein on Twitter @galal_hussein.
I recently used Docker and Rancher to set up a Redis cluster on Digital Ocean. Redis clustering provides a way to share data across multiple Redis instances, keys are distributed equally across instances using hash slots. Redis clusters provide a number of nice features, such as data resharding and availability between instances.