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Displaying posts with tag: cloudflare (reset)
Working with CloudFlare DNS in python

Last week I wrote about aDNS discovery feature in Etcd. As a step in the whole process we need to create DNS records in zone. CloudFlare provides rich API to work with it. We wrapped it into a Python module twindb_cloudflare and opensourced it:

In the post I will show how to use twindb_cloudflare module.

CloudFlare API …

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Setting up Etcd cluster with DNS discovery

Setting up an etcd cluster with DNS discovery may be challenging. There are several building blocks:

  • Etcd – a distributed key value store
  • Amazon EC2 – cloud computing provider
  • Cloudflare – DNS provider
  • Chef – for configuring individual nodes

Each of them has their pitfalls, we will guide you through whole process.

DNS discovery

Any clustered system needs a way to maintain a list of nodes in a cluster. Usually you need to specify all cluster members when starting a node. This is the way zookeeper and consul works. Effectively you have redundancy in configuration – the list of nodes is stored on every node. The list must be consistent and it’s difficult to maintain it especially if the cluster …

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Cloudflare, now offering to be your Single Point of Failure

There have been many articles about the downtime issue with Cloudflare last week, so I won’t get into the technical details of that. However, there’s the fine print to remember. Consider this a subtle reminder that core Internet infrastructure services like Cloudflare’s DNS-based “Always Online” caching and packet inspection security services do not come with Service Level Agreements even at the “Pro” account level. Even with a Pro account you are paying for a service with no uptime guarantee and you must only hope that it resolves your sites the majority of the time. This is fine, this is what the contract says: no SLA unless you pay for the Business account. An odd naming convention given that most Professionals are using their websites for business and would want the SLA, but I digress.

So, the SLA is not really the issue if you look at the architectural alternatives to building an architecture that desires availability when …

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Showing entries 1 to 3