Back in October 2016, Docker released Infrakit, an open source toolkit for creating and managing declarative, self-healing infrastructure. This is the second in a two part series that dives more deeply into the internals of InfraKit.
In the first installment of this two part series about the internals of InfraKit, we presented InfraKit’s design, architecture, and approach to high availability. We also discussed how it can be combined with other systems to give distributed computing clusters self-healing and self-managing properties. In this installment, we present an example of leveraging Docker Engine in Swarm Mode to achieve high availability for InfraKit, which in turn enhances the Docker Swarm cluster by making it self-healing.
One of the key architectural features of Docker in Swarm Mode is the manager quorum powered by SwarmKit. The manager quorum stores information about the cluster, and the consistency of information is achieved through consensus via the Raft consensus algorithm, which is also at the heart of other systems like Etcd. This guide gives an overview of the architecture of Docker Swarm Mode and how the manager quorum maintains the state of the cluster.
One aspect of the cluster state Continue reading
Cisco's new security chief has ambitions bigger than $2B a year.
The Garmin Fenix 3 is a GPS fitness tracker with limited smartwatch functionality. I bought it in May 2016 to be my constant companion when I hike, trail run, Crossfit, and sleep. Here’s my review after tracking over a million steps with the device.
I adore the Fenix 3. The watch was an expensive technology purchase, but I feel the money was well-spent. The Fenix 3 has met or exceeded my expectations in every area. Despite my ardent adoration, the F3 is not perfect.
Folks shopping the Garmin product line should know that there is now a Fenix 5 line out. There was never a Fenix 4. However, I’ve not seen anything in the F5 line that makes me want to upgrade from my F3.
The Fenix 3 is big and bulky. I knew this going in, and so I don’t mind. I especially don’t mind because part of that bulk is due to the battery. However, the bulk does make it difficult to wear under cuffed shirts. The watch stands tall, so if you try buttoning a shirt cuff around the Fenix 3, you’re in for a tight Continue reading
Organizations that implement network virtualization are starting to appreciate another advantage: It enables them to achieve compliance.
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