Mesh Network Open Source
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Apache Kafka and its accompanying key-value store are being used to provide persistent storage for a growing list of relational databases. Most used a key-value store as a foundation. Among the latest to emerge is KarelDB, a relational database built almost entirely on open source components, including Apache Calcite for the SQL engine along with Apache Omid for transactions and control features. The open-source database so far only supports a single node, but database watchers consider it sufficiently promising to track for future scaling. KaralDB and other emerging databases are built on a Kafka embedded key-value store and in-memory cache known as KCache. The new relational database by default uses KCache configured as a RocksDB cache supported by ubiquitous Kafka stream processing software. "This allows KarelDB to support larger datasets and faster startup times, " noted Robert Yokota of Kafka-based streaming platform vendor Confluent. "KCache can also be configured to use an in-memory cache instead of RocksDB if desired, " Yokota added in recent blog post introducing KarelDB.
Open source mesh network
It also allow people to communicate without any central hub to tap into for those that want to listen in on the private communication of citizens, which have become more and more important over the years. So far I have only been able to find one group of people in Oslo working on community mesh networks, over at the hack space Hackeriet at Husmania. They seem to have started with some Freifunk based effort using OLSR, called the Oslo Freifunk project, but that effort is now dead and the people behind it have moved on to a batman-adv based system called meshfx. Unfortunately the wiki site for the Oslo Freifunk project is no longer possible to update to reflect this fact, so the old project page can't be updated to point to the new project. A while back, the people at Hackeriet invited people from the Freifunk community to Oslo to talk about mesh networks. I came across this video where Hans Jørgen Lysglimt interview the speakers about this talk (from youtube): I mentioned OLSR and batman-adv, which are mesh routing protocols.
If anyone know how to use that old wifi access point with batman-adv these days, please let me know. If you find this project interesting and want to join, please join us on IRC, either channel #oslohackerspace or #nuug on While investigating mesh networks in Oslo, I came across an old research paper from the university of Stavanger and Telenor Research and Innovation called The reliability of wireless backhaul mesh networks and elsewhere learned that Telenor have been experimenting with mesh networks at Grünerløkka in Oslo. So mesh networks are also interesting for commercial companies, even though Telenor discovered that it was hard to figure out a good business plan for mesh networking and as far as I know have closed down the experiment. Perhaps Telenor or others would be interested in a cooperation? Update 2013-10-12: I was just told by the Serval project developers that they no longer use batman-adv (but are compatible with it), but their own crypto based mesh system.
Omid also uses a technique called multi-version concurrency control to implement "snapshot isolation" in other relational databases. KarelDB also is touted for its ability to run either as an embedded database or as a server. In the latter case, it uses Apache Avatica to support the Remote Procedure Call wire protocol. Among the advantages of running these and other open-source components with Kafka is the ability of multiple servers to "tail" the same set of topics, Yokota noted. "This allows multiple KarelDB servers to run as a cluster, with no single-point of failure, " he added. KarelDB is named after Karel Capek, a Czech science fiction author who is credited with inventing the word "robot". A programming language is also named for him. Recent items: Kafka in the Cloud: Who Needs Clusters Anyway? Rockset Connects Kafka with SQL
Mesh network management software open source
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Mesh network open source programs
Peer-to-Peer Serverless, peer-to-peer architecture that uses Distributed Hash Tables (DHT). No meta data is stored since even we don't know to whom you are chatting with. Works as LAN chat just as it works on the Internet. Works in private LAN networks not connected to Internet. Anonymous profiles use Tor Network to hide your identity. Secure Uses RSA 2048 bit keys to generate profiles. Provides end-to-end encryption with Perfect Forward Secrecy (PFS) using DHE-2048 or ECDHE-256. Protocol is secured with AES 256-bit encryption with Authenticated Encryption. Changeable user identifier to hide identity. Open source implementation allows you to inspect the code. Why Is Privacy Important? Watch this episode of Last Week Tonight with John Oliver: Government Surveillance (HBO) in which John sits down with Edward Snowden to discuss the NSA, the balance between privacy and security, and dick-pics. You may wish to skip to 13:38 in the video to jump to the interview. "Your rights matter because you never know when you're going to need them. "
Wireless mesh networks are self organising and self healing networks that can be used to connect computers across small and large areas, depending on the radio technology used. Normal wifi equipment can be used to create home made radio networks, and there are several successful examples like Freifunk and Athens Wireless Metropolitan Network (see wikipedia for a large list) around the globe. To give you an idea how it work, check out the nice overview of the Kiel Freifunk community which can be seen from their dynamically updated node graph and map, where one can see how the mesh nodes automatically handle routing and recover from nodes disappearing. There is also a small community mesh network group in Oslo, Norway, and that is the main topic of this blog post. I've wanted to check out mesh networks for a while now, and hoped to do it as part of my involvement with the NUUG member organisation community, and my recent involvement in the Freedombox project finally lead me to give mesh networks some priority, as I suspect a Freedombox should use mesh networks to connect neighbours and family when possible, given that most communication between people are between those nearby (as shown for example by research on Facebook communication patterns).
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There are heaps of different protocols, and I am still struggling to figure out which one would be "best" for some definitions of best, but given that the community mesh group in Oslo is so small, I believe it is best to hook up with the existing one instead of trying to create a completely different setup, and thus I have decided to focus on batman-adv for now. It sure help me to know that the very cool Serval project in Australia is using batman-adv as their meshing technology when it create a self organizing and self healing telephony system for disaster areas and less industrialized communities. Check out this cool video presenting that project (from According to the wikipedia page on Wireless mesh network there are around 70 competing schemes for routing packets across mesh networks, and OLSR, B. A. T. M. N. and B. advanced are protocols used by several free software based community mesh networks. The batman-adv protocol is a bit special, as it provide layer 2 (as in ethernet) routing, allowing ipv4 and ipv6 to work on the same network.