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Displaying posts with tag: High Availability (reset)

Is Zero downtime even possible on RDS?
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Join 29,000 others and follow Sean Hull on twitter @hullsean. Oh RDS, you offer such promise, but damn it if the devil isn’t always buried in the details. Diving into a recent project, I’ve been looking at upgrading RDS MySQL. Major MySQL upgrades can be a bit messy. Since the entire engine is rebuilt, queries […]

High Availability File Sync and Share - Deploying ownCloud with Galera Cluster for MySQL and GlusterFS
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January 5, 2015 By Severalnines

Cloud storage is hot. Dropbox, Apple iCloud, Google Drive, Microsoft SkyDrive and Amazon Cloud Drive all offer cloud sharing platforms where you can store documents in the cloud and access them from all your devices. For enterprises who require full control, ownCloud is an open source solution that allows files to be stored on-premises and/or a backend cloud. 


In this blog post, we’ll show you how to deploy a high availability setup using ownCloud Community Edition. We will need to set up redundancy in each of the following layers:

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Resources for Database Clusters: New Chef Cookbook, New Devops Webinar for eCommerce and More
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Check Out Our Latest Technical Resources for MySQL, MariaDB & MongoDB Clusters

Like every month this year, we have created new content and tools for you; here is a summary of what we’ve published this December. Please do check it out and let us know if you have any comments or feedback.

And thank you for following us in the past 12 months and for your fidelity; we look forward to “seeing” you next year as well and wish you a great start to 2015!


New Live Technical Webinars


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Typical misconceptions on Galera Replication for MySQL
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Even if a Galera node looks like a regular MySQL server, the underlying replication mechanism is very different. This implies some changes in the way you have to configure the Galera nodes. Here are some of the most common misconceptions about Galera when using Percona XtraDB Cluster.

Q: Why should I enable binary logging as it is not needed by Galera replication?
Unlike for regular asynchronous MySQL replication, it is true that …

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How to setup High Availability PrestaShop on multiple servers with MariaDB Galera Cluster
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November 7, 2014 By Severalnines

PrestaShop is a popular open source e-commerce software powering over 200,000 online stores, according to the company. We’ve seen a bit of interest into high availability PrestaShop setups, so this post will show you how to achieve that on multiple servers. Note that this setup not only caters for failures, but by load balancing traffic across multiple servers, it also allows the system to scale and handle more users.

This post is similar to our previous posts on web application scalability and high availability:

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MySQL ring replication: Why it is a bad option
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I’ve recently worked with customers using replication rings with 4+ servers; several servers accepting writes. The idea behind this design is always the same: by having multiple servers, you get high availability and by having multiple writer nodes, you get write scalability. Alas, this is simply not true. Here is why.

High Availability

Having several servers is a necessary condition to have high availability, but it’s far from sufficient. What happens if for instance C suddenly disappears?

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Active-Active Replication, Performance Improvements & Operational Enhancements – some of what’s available in the new MySQL Cluster 7.4.1 DMR
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Oracle have just made availble the new MySQL Cluster 7.4.1 Development Milestone Release – it can be downloaded from the development release tab here. Note that this is not a GA release and so we wouldn’t recommend using it in production.

There are three main focus areas for this DMR and the purpose of this post is to briefly introduce them:

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ePayment Processing Data over multi-Datacenter MariaDB Cluster - Paytrail chooses ClusterControl
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September 26, 2014 By Severalnines

Paytrail is a leading e-payment method provider from Finland, and is expanding globally. Established in 2007, Paytrail currently has over 4,000 business customers, works with over 350 partners and its solution is available in all SEPA (Single Euro Payments Area) countries.


Paytrail offers a new online shopping solution that allows consumers to use one login for all of their online purchases. And it provides everything that is needed for online shopping in addition to traditional payment methods (bank e-payments, credit and debit card payments, invoicing and …

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Nuances of MySQL Fabric User GRANTs
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MySQL Fabric is a new product and some folks are running into issues when trying to deploy test instances that grow beyond a single server.

The Fabric documentation has an example GRANT statement illustrating the simple localhost use case:

CREATE USER 'fabric'@'localhost' IDENTIFIED BY 'secret';
GRANT ALL ON *.* TO 'fabric'@'localhost';

The example shown above belies the more complex way that Fabric uses the fabric login.

The Fabric config file has 3 sections that deal with user and password values, I will only focus on the …

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Webinar Replay & Slides: Performance Tuning of HAProxy for Database Load Balancing
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September 11, 2014 By Severalnines


Thanks to everyone who attended and participated in this week’s webinar on ‘Performance Tuning of HAProxy for Database Load Balancing’. And special thanks to our guest speaker, Baptiste Assmann of HAProxy Technologies. 


If you missed the sessions or would like to watch the webinar again & browse through the slides, they are now available online.


Watch the replay of this webinar to learn about what HAProxy can tell you about your application and database instances. And understand the difference between …

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10 Newer Entries Showing entries 31 to 40 of 215 10 Older Entries

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