10 Vendors Making Strides In DevOps
There's a lot of hype around DevOps. Find out which vendors are really helping enterprises support a DevOps culture.
Gartner: Network Budgets Should Focus On People, Not Products
Analysts say enterprises can save money on networking technology and invest the savings back into their networking team.
Discussing Disruption to IT
Disruption has come to mean different things in the realm of IT. It’s difficult to read social media for a day without seeing the word "disruption" abused by the great marketing machine.
Using this word in the context of "disruption to service" or put it another way, "What happens when something doesn’t work?", it’s difficult to come up with a good anecdote to describe the impact of something going wrong when you’re in front of customers without sounding like another marketeer. I firmly believe in delivering value by "showing" as opposed to just battering your audience with slide ware.
Still, in networking we are actually going through a period of huge change. The CLI skill set is still dominant and I’m not scare mongering when I say over time this will change. It will. It just won’t change as fast as some people will have you believe. Anyway, I digress.
Fred
At college, I studied the greatest passion in life I had at the time, which was electronics. The local college department was ok and the material was industry standard stuff. Nothing crazy and out there, but useful and real. We had one super hero in the Continue reading
Exascale Code Performance and Portability in the Tune of C
Among the many challenges ahead for programming in the exascale era is the portability and performance of codes on heterogeneous machines.
Since the future plan for architectures includes new memory and accelerator capabilities, along with advances in general purpose cores, developing on a solid base that offers flexibility and support for many hardware architectures is a priority. Some contend that the best place to start is with C++, which has been gathering steam in HPC in recent years.
As our own Douglas Eadline noted back in January, choosing a programming language for HPC used to be an easy task. Select …
Exascale Code Performance and Portability in the Tune of C was written by Nicole Hemsoth at The Next Platform.
Use VRFs to Solve Routing-on-Hosts Challenges
One of my readers sent me interesting feedback after reading my explanation of why I’d try not to use OSPF as a routing protocol between hosts and ToR switches. He said:
Unfortunately we can’t use BGP because IBM mainframes support only OSPF or RIP, so we decided to use VRFs instead.
Here’s what they did:
Read more ...Packet Walk Through-Part 1
The objective of this blog is to discuss end to end packet (client to server) traversing through a service provider network with special consideration on performance effecting factors.
We will suppose client needs to access any of the service hosted in server connected with CE-2, all the network links and NICs on end system are Ethernet based. Almost all the vendors compute machines (PC/ servers) are generating IP data gram with 1500 bytes size (20 bytes header +1480 data bytes) in normal circumstances.
Fragmentation:- If any of link is unable to handle 1500 size IP data-gram then packet will be fragmented and forwarded to its destination where it will be re-assembled. The fragmentation and re-assembly will introduce overhead and defiantly over all performance will be degraded. In IP header following fields are important to detect fragmentation and to re-assemble the packets.
- Identification:- Is unique for all segments if packet is fragmented at all
- Flags – 3 bits . Bit 0 always 0, bit 1 -DF (Fermentation allowed or not 0 and 1 respectively), Bit 2-MF (More fragments expected or Last , 1 and 0 respectively)
- Fragments Offset :- Determine where data will start after removal of IP header in 1st and subsequent segments once packet is re-assembled.
With below Continue reading
No, Trump’s losses doesn’t allow tax avoidance
The New York Times is reporting that Tump lost nearly a billion dollars in 1995, and this would enable tax avoidance for 18 years. No, it doesn't allow "avoidance". This is not how taxes work.Let's do a little story problem:
- You invest in a broad basket of stocks for $100,000
- You later sell them for $110,000
- Capital gains rate on this is 20%
- How much taxes do you owe?
Obviously, since you gained $10,000 net, and tax rate is 20%, you then owe $2,000 in taxes.
But this is only because losses offset gains. All the stocks in your basket didn't go up 10%. Some went up more, some actually lost money. It's not unusual that the losing stocks might go down $50,000, while the gainers go up $60,000, thus giving you the 10% net return, if you are investing in high-risk/high-reward stocks.
What if instead we change the tax code to only count the winners, ignoring the losing stocks. Now, instead of owing taxes on $10,000, you owe taxes on $60,000. At 20% tax rate, this comes out to $12,000 in taxes -- which is actually more than you earned on your investments.
Taxing only investments that Continue reading
Your Guide to LinuxCon and ContainerCon Europe
Hey Dockers! We had such a great time attending and speaking at LinuxCon and ContainerCon North America, that we are doing it again next week in Berlin – only bigger and better this time! Make sure to come visit us at booth #D38 and check out the awesome Docker sessions we have lined up:
Keynote!
Solomon Hykes, Docker’s Founder and CTO, will kick off LinuxCon with the first keynote at 9:25. If you aren’t joining us in Berlin, you can live stream his and the other keynotes by registering here.
Sessions
Tuesday October 4th:
11:15 – 12:05 Docker Captain Adrian Mouat will deliver a comparison of orchestration tools including Docker Swarm, Mesos/Marathon and Kubernetes.
12:15 – 1:05 Patrick Chanezon and David Chung from Docker’s technical team along with Docker Captain and maintainer Phil Estes will demonstrate how to build distributed systems without Docker, using Docker plumbing projects, including RunC, containerd, swarmkit, hyperkit, vpnkit, datakit.
2:30 – 3:20 Docker’s Mike Goelzer will introduce the audience to Docker Services in Getting Started with Docker Services, explain what they are and how to use them to deploy multi-tier applications. Mike will also cover load balancing, service discovery, scaling, security, deployment Continue reading