Happy Thanksgiving!
Today, We wish and hope all of our friends and students have a very Happy Thanksgiving!
Installing CoreOS
If you haven’t heard of CoreOS it’s pretty much a minimal Linux distro designed and optimized to run docker. On top of that, it has some pretty cool services pre-installed that make clustering CoreOS pretty slick. Before we go that far, let’s start with a simple system installation and get one CoreOS host online. In future posts, we’ll bring up more hosts and talk about clustering.
The easiest way to install CoreOS is to use the ‘coreos-install’ script which essentially downloads the image and copies it bit for bit onto the disk of your choosing. The only real requirement here is that you can’t install to a disk you’re currently booted off of. To make this simple, I used a ArchLinux lightweight bootable Linux distro. So let’s download that ISO and get started…
Note: I use a mix of CoreOS VMs and physical servers in my lab. In this walkthrough I’ll be doing the install on a VM to make screenshots easier. The only real difference between the install on either side was how I booted the ArchLinux LiveCD. On the virtual side I just mounted the ISO and booted Continue reading
Thanks for being there!
A third of my readers are celebrating Thanksgiving today, and I’d like to use the opportunity to say what I always wanted to say but somehow never got to it. Let’s make it short: Thank you! Without you, there would be no ipSpace.net.
Read more ...IPv6 in the Enterprise by Jeff Doyle and Orhan Ergun
[player] Orhan Ergun and Jeff Doyle talks about IPv6 design and deployment considerations in the Enterprise networks. They strongly advice you to consider IPv6 deployment in your network. Why IPv6 in the Enterprise , what are the real business drivers for the IPv6 ? Growth of IPv6 in the Enterprise Networks Jeff Doyle’s advices to... Read more »IPv6 in the Enterprise by Jeff Doyle and Orhan Ergun
[player] Orhan Ergun and Jeff Doyle talks about IPv6 design and deployment considerations in the Enterprise networks. They strongly advice you to consider IPv6 deployment in your network. Why IPv6 in the Enterprise , what are the real business drivers for the IPv6 ? Growth of IPv6 in the Enterprise Networks Jeff Doyle’s advices to […]
The post IPv6 in the Enterprise by Jeff Doyle and Orhan Ergun appeared first on Packet Pushers.
IPv6 in the Enterprise by Jeff Doyle and Orhan Ergun
Orhan Ergun and Jeff Doyle talks about IPv6 design and deployment considerations in the Enterprise networks. They strongly advice you to consider IPv6 deployment in your network. Why IPv6 in the Enterprise , what are the real business drivers for the IPv6 ? Growth of IPv6 in the Enterprise Networks Jeff Doyle’s advices to Service […]
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The post IPv6 in the Enterprise by Jeff Doyle and Orhan Ergun appeared first on Packet Pushers Podcast and was written by Orhan Ergun.
War Stories: Unix Security
A different kind of war story this time: Unix security blunders. Old-school Unix-types will mutter about how much more secure Unix systems are than Windows, but that glosses over a lot. In a former life I worked as an HP-UX sysadmin, and I saw some shocking default configurations. I liked HP-UX – so much better laid out than Solaris – but it was very insecure by default. Here’s a few things I’ve come across:
Gaining Root
We’d lost the root password for a test HP-UX server. We had user access, but not root. The server was located in a different DC, and we didn’t really feel like going and plugging in a console cable to reset the root password. So we started looking around at how we might get access. After a while I found these two things:
- Root’s home directory was ‘/‘ – this was the default on HP-UX
- The Remote Login service was running
And now for the kicker:
hpux lhill$ ls -ld / drwxrwxrwx 30 root wheel 1020 1 Nov 13:57 /
Put those together, and you can see it’s easy to gain root. All we needed to do was create /.rhosts, and add whatever Continue reading
The Pando Tor conspiracy troll
Tor, also known as The Onion Router, bounces your traffic through several random Internet servers, thus hiding the source. It means you can surf a website without them knowing who you are. Your IP address may appear to be coming from Germany when in fact you live in San Francisco. When used correctly, it prevents eavesdropping by law enforcement, the NSA, and so on. It's used by people wanting to hide their actions from prying eyes, from political dissidents, to CIA operatives, to child pornographers.Recently, Pando (and Internet infotainment site) released a story accusing Tor of being some sort of government conspiracy.
This is nonsense, of course. Pando's tell-all exposé of the conspiracy contains nothing that isn't already widely known. We in the community have long joked about this. We often pretend there is a conspiracy in order to annoy uptight Tor activists like Jacob Appelbaum, but we know there isn't any truth to it. This really annoys me -- how can I troll about Tor's government connections when Pando claims there's actually truth to the conspiracy?
The military and government throws research money around with reckless abandon. That no more means they created Tor than it means they created the Continue reading
How to Customize CORE Network Emulator Services
When running services on nodes in a CORE Network Emulator scenario, we may wish to customize the services configurations.
Some reasons why a user may customize CORE services are:
- Set up complex network emulation scenarios by adding more configuration information to required services
- Simplify network emulation scenarios by removing default configurations from CORE Services
- Enable the CORE GUI to execute user-generated scripts or commands on network nodes while running a simulation
- Save customized configurations on each node in the CORE Network Emulator configuraion file.
To show how to customize CORE Services, we will work through a detailed tutorial that shows how to customize the IPForward service. We will work through the same steps required to customize any other CORE Service.
The IPForward CORE Service
The IPForward CORE Service provides a script that runs when the node starts in a simulation scenario. The script sets the IP Forwarding kernel parameters so that the node will forward packets from one port to another, according to the routing table on the node. The IPForward script is a default service on the Router node type.
Why customize this service?
The default IPForward CORE service has limited functionality: it can start IP forwarding on a Continue reading
NeDi and Observium
NeDi and Observium are two of my favourites network monitoring tools. I do like to deploy both, they complete each other and since they’re free there is no need to choose. The only problem with the use of two tools is…Tech Notes: Difference Between OS1 and OS2 Fibre Optic Cable
These are two standards for single mode fibre optic cabling from a total of five types of fibre that are generically used today known of “OF types” (OM1, OM2, OM3 for multimode and OS1,OS2 for single mode.) OS1 is for indoor use i.e. Campus, Data Centre. Cabling is is tight buffered (i.e. manufactured into solid […]
The post Tech Notes: Difference Between OS1 and OS2 Fibre Optic Cable appeared first on EtherealMind.
5 ways to tell a cloud poser from a cloud pro
Who would you trust more to fix your car, a licensed mechanic or a guy who once saw someone do an oil change? The choice should be simple. But surprisingly, the debate over trusting an expert versus someone who claims to be an expert happens every day across all industries, so it shouldn’t be shocking that the debate rages in the cloud, too.
Cloud computing enables people and companies to access applications from any computer. But the cloud has created a new group of cloud posers -- inexperienced software developers who make bold (and often untrue) claims about the performance of the cloud-based applications they manage. While on the surface they may seem like a good choice to support your business, once you start asking smart questions, a cloud poser’s true colors (and lack of expertise) will quickly be revealed.
To read this article in full or to leave a comment, please click here
What to consider when negotiating a hybrid cloud SLA
Service Level Agreements (SLA) serve as a roadmap and a warranty for cloud services offerings. All cloud providers offer standard, one-size-fits-all SLAs that cover availably, performance, security, disaster recovery, response times, compliance and termination. This may be adequate for pure cloud applications, however standard SLAs fall short when it comes to hybrid cloud deployments.
There is nothing standard about hybrid deployments. Each one is different and inherently includes a higher level of involvement from IT. SLAs need to establish clear guidelines of engagement for both the enterprise and service provider. Unfortunately, not all cloud service providers are open or equipped to customize SLAs.
To read this article in full or to leave a comment, please click here
Transactional Thoughts on a Stormy Night
It was a dark stormy autumn night and three networking engineers had nothing better to do than ponder the heavy topics of transactional consistency in a distributed SDN environment in Episode 16 of Software Gone Wild podcast.
Here are a few of the topics that crossed our minds:
Read more ...Cisco Champion.
Woke up to a very nice email today.
I have been selected as a Cisco Champion for 2015! – Now i get to see what all the fuzz is about and hopefully be able to contribute something.
Wizards are also for, well, wizards
I always enjoy reading the IPspace blog and as Ivan has stated about our blog, I don’t always agree with his opinion, but they are informative and cover just about everything networking. So this may come as a surprise, but in response to his “Do we have too many knobs” post from about a week ago I have one simple response: “Amen”.
Networking is unnecessarily complicated. We have written several blogs on this topic and related items. I used to run the sustaining organization for all data products at my previous company and when you do the analysis of the customer reported issues that come in to the support organization, you find that a very large percentage stem from configuration mistakes.
Many of those mistakes are not typos. We like to refer to fat fingered configurations often as a reason to move to a more automated configuration and provisioning environment, but most of the configuration mistakes that are made are simply because we have made it so difficult to configure these devices. Type something in the wrong order and it may not work right or behave slightly differently. Simple checks across configurations that could avoid many problems are Continue reading
Ansible 1.8 Now Released!
We're sitting out a few days from Thanksgiving in the U.S., and it's time once again to give thanks to people in our free software community.
On a related note, a while back James Martin and I were having a conversation about what the collective noun for Ansible-using-people was. We came up with "Ansiblings" - somewhat because it reminds me of Starcraft zerglings, because we are numerous, aggressive, and get things done fast-- but that's not so much why. More so, because Ansible users are kind of a family. This year, our way of giving thanks to our family won't be with a tryptofan-soaked turkey (Wikipedia seems to say that's a myth but what do they know?), but rather with another great release of Ansible.
YES -- Ansible 1.8 is now available on PyPi and our official Ubuntu PPA, and will soon be available via other packaging mirrors. And at this point, Ansible's reached an amazing 919 contributors on GitHub, with over 8400stars and 2600 forks, and you can find a large list of dedicated meetup groups all over too.
One of the most notable features in Ansible 1.8 has been the long Continue reading
Riding the SD-WAN Wave
Software Defined Networking has changed the way that organizations think about their network infrastructure. Companies are looking at increasing automation of mundane tasks, orchestration of policy, and even using white box switches with the help of new unbound operating systems. A new class of technologies that is coming to market hopes to reduce complexity and cost for the Achilles Heel of many enterprises: the Wide Area Network (WAN).
Do You WANt To Build A Snowman?
The WAN has always been a sore spot for enterprise networks. It’s necessary to connect your organization to the world. If you have remote sites or branch locations, it is critical for daily operations. If you have an e-commerce footprint your WAN connection needs to be able to handle the generated traffic. But good WAN connectivity costs money. Lots of money.
WAN protocols are constantly being refined to come up with the fastest possible transmission and the highest possible uptime. Frame Relay, Asynchronous Transfer Mode (ATM) and Multi-Protocol Label Switching (MPLS) are a succession of technologies that have shaped enterprise WAN connectivity for over a decade. They have their strengths and weaknesses. But it is difficult to build an enterprise WAN Continue reading
Ansible Tower Demo Webinar
We have been running monthly Ansible Tower demo webinars over the past few months. These webinars are a great way to see Ansible Tower in action and be able to ask questions and have them answered by our own Dave Johnson.
Our Latest Tower Demo Webinar
Be sure to check our events page for all of our upcoming AnsibleFests, trainings and webinars.
PQ Show 36 – ENIGMA NMS – Network Management – The Engineers Monitoring System from NETSAS Australia
Network management and monitoring is at the heart of every network but not every product is based on client requests. Enigma NMS has been built by engineers for engineers to use. That's why the interface will be totally familiar to you and has the features you expect to be in the product.
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The post PQ Show 36 – ENIGMA NMS – Network Management – The Engineers Monitoring System from NETSAS Australia appeared first on Packet Pushers Podcast and was written by Greg Ferro.