Posts Tagged ‘Docker’
Multi tier Docker apps with Fig
I had a play with Fig whilst researching my InfoQ story on Docker’s acquisition of Orchard Labs. Rather than just going through the quick start guide and firing up their example app I thought I’d try out my own three tier demo from when I last wrote about multi tier apps with Docker. The three […]
Filed under: Docker | 2 Comments
Tags: Docker, Fig, Orchard Labs
This was a warm up for a presentation I’ll be doing at AppSec USA later in the year. I got some good feedback on the night, but if you have more then please make a comment below.
Filed under: CohesiveFT, Docker, presentation, security | Leave a Comment
Tags: Chicago, DevOps, Docker, meetup, security
I wrote a few days ago about my first failed attempt to do this. After some perseverance, and with some lessons learned along the way I’m pleased to say that I now have it working. Given that VXLAN (at least in the Linux kernel implementation) needs multicast I’m still not sure that this is a […]
Filed under: Docker, networking | 3 Comments
Tags: 14.04, bridge, Docker, iproute2, multicast, network, open vswitch, tunnel, Ubuntu, vxlan
This seemed like a good idea, as VXLAN has been in the Linux kernel since 3.7. TL;DR – this doesn’t work as I’d hoped. The two major issues being: VXLAN needs a multicast enabled network, which rules out most public clouds. Instability – I’ve managed to provoke multiple kernel panics on stock Ubuntu 14.04. Background […]
Filed under: Docker, networking | 2 Comments
Tags: bridge, Docker, fail, gre, iproute2, multicast, network, open vswitch, tunnel, Ubuntu, vxlan
Beware the default network
I was helping a colleague troubleshoot a deployment issue recently. He’d set up a virtual private cloud (VPC) in Amazon with a public subnet and a bunch of private subnets: 10.0.0.0/16 – VPC (the default) 10.0.0.0/24 – Public subnet 10.0.0.1/24 – Private subnet 1 10.0.0.2/24 – Private subnet 2 10.0.0.3/24 – Private subnet 3 Everything was behaving […]
Filed under: cloud, CohesiveFT, Docker, networking | 1 Comment
Tags: aws, CIDR, conflict, defaults, Docker, howto, LXC, lxcbr0, networks, peering, routing, troubleshooting, VNS3, VPC
Docker memory profiling
Not long after my friend and colleague Leslie Muller created his first virtual machine manager[1] we came to a realisation that the primary resource constraint was RAM (rather than CPU or storage). Virtual machines can quickly consume giant quantities of RAM, and that’s what we ended up carving up the underlying hardware by. Apparently the […]
Filed under: Docker | 1 Comment
Tags: applications, Docker, hosting, KVM, memory, OpenVZ, RAM, VPS
Boot2Docker on Hyper-V
Boot2Docker is a minimal (27MB) Linux image for running Docker. I started using it yesterday whilst investigating Docker on Mac OS X. It’s designed to work with VirtualBox, and comes with a script to control the lifecycle of the Boot2Docker VM inside of VirtualBox. There’s no reason however why it shouldn’t be used with other […]
Filed under: Docker, howto | 6 Comments
Tags: boot2docker, Docker, Docker.io, persistence, VHD
Multi tier apps in Docker.io
Docker provides the means to link containers, which comes in two parts: Outside the container (on the docker command line) a ‘-link name:ref’ is used to create a link to a named container. Inside the container environment variables REF_… are populated with IP addresses and ports. Having linked containers together it’s then necessary to have a little […]
Filed under: code, Docker, howto | 3 Comments
Tags: address, app server, database, Docker, Docker.io, Dockerfile, enviornment, link, linking, MySQL, Nginx, port, Ruby, Sinatra, SSL, ToDoMVC, web server
Ubuntu images on Docker.io
When trying to install node.js into the default official Ubuntu image on Docker the other day I hit a dependency issue. Node.js needs rlwrap[1], and rlwrap is in the universe repository, which it turns out isn’t part of /etc/apt/sources.list for the 12.04 image: deb http://archive.ubuntu.com/ubuntu precise main Things worked using the ubuntu:quantal (== ununtu:12.10) image […]
Filed under: Docker | Leave a Comment
Tags: 12.04, 12.10, Docker, Docker.io, Dockerfile, main, node, node.js, precise, quantal, rlwrap, sed, sources.list, Ubuntu, universe
Node-RED on Docker
Docker is going into the next release of CohesiveFT’s VNS3 cloud networking appliance as a substrate for application network services such as proxy, reverse proxy, load balancing, content caching and intrusion detection. I’ve been spending some time getting familiar with how Docker does things. Since I’ve also been spending some time on Node-RED recently I […]
Filed under: code, CohesiveFT, Docker | 2 Comments
Tags: Docker, Docker.io, Dockerfile, image, index, node, Node-RED, node.js, repository
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