Hollis Silker

You have the desire, the energy, and the skills to beef up the insulation around your house, but the cost of materials has put the job on pause.

This was me a few weeks ago. My wife and I were ready to convert our attic into an art studio and office. My thought had been to fill the bays between the rafters with high-R polyisocyanurate rigid board insulation.

At my local home center, the 2″ polyiso with laminated foil on both sides was selling for $40 per board. With 32 rafter bays to fill, each one 18″ wide, I would need at least 26 sheets at a cost of $1,040 plus tax. What I really wanted was at least 4″-thick panels, so the job would cost over $2,000 in materials.

Polyiso boards are pricier than other types of insulation, because they offer an R-value between 6 and 7 per inch—a big advantage over fiberglass, cellulose, and other rigid board products. With 4″-thick polyiso, I'd have a respectable 24- to 28-R roof. In addition, the boards offer a much better air barrier than fiberglass batts, especially with the joints sealed by caulk or foam for improved performance.

A stroke of luck
Fortunately, I talk through most of my home improvement projects with a knowledgeable co-worker, who recalled seeing an ad for polyiso insulation on Craigslist. I checked it out and sure enough, a guy named Wallie was selling a mix of 3″- and 4″-thick 4′ x 8′ sheets for $24 each. Wallie wouldn't tell me the brand or where he'd gotten the stuff, but he did invite me to his warehouse to check it all out.

The sheets were all wrapped in plastic upon which was printed, in one or two spots, the partially obscured logo of a reputable manufacturer. My guess is that Wallie buys leftovers from large commercial roofing jobs. The laminated facings were not foil, and some of the sheets were irregular in size, but it was twice as much insulation as at the home center for nearly half the cost.

I did have to rent a trailer and drive 25 minutes to pick up, but that was a small price to pay for $1,400 in savings. The deal was made even sweeter when Wallie offered me several dinged sheets to compensate for the extra waste I'd generate when cutting up the 4′ x 4's.

Check classified ads before you buy
A quick survey of offerings in my area shows many Craigslist deals for various kinds of insulation and other types of building materials. New, in-the-package fiberglass batts sell for 20% to 30% less than in stores. There's also water heater insulation, foam pipe insulation, shrink film for windows, caulk, and weatherstripping at prices nearing 50% off. In addition, there are great deals to be found on insulated vinyl replacement windows. There are even 120 used solar collectors for hot water systems going for $125 a piece!

So the next time prices at the home center seem a little stiff, check out Craigslist and similar sources before paying full price at the home center. You'll save some money and help keep some stuff out of the local landfill.

For more on sourcing building materials, consider:

Shopping DIY Online
Great Places to Buy Architectural Salvage
Why Is The Home Depot So Crowded?

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. Docker Hub has free and paid services. If you were provided with a training VM for a hands-on tutorial, you can skip this. Binary download from Docker. Running an entire server cluster on Docker containers, on a single Docker host could introduce the risk of single point of failure. Google started a project called Kubernetes to solve this problem. Kubernetes provides a cluster of Docker hosts for managing Docker containers in a clustered environment. It provides an API on top of Docker API for. Docker CLI. docker build # Build an image from a Dockerfile. docker images # List all images on a Docker host. docker run # Run an image. docker ps # List all running and stopped instances. docker stop # Stop a running instances. docker rm # Remove an instance. docker rmi # Remove an image. Docker Architecture.

The Play with Docker classroom brings you labs and tutorials that help you get hands-on experience using Docker. In this classroom you will find a mix of labs and tutorials that will help Docker users, including SysAdmins, IT Pros, and Developers. There is a mix of hands-on tutorials right in the browser, instructions on setting up and using Docker in your own environment, and resources about best practices for developing and deploying your own applications.

We recommend you start with one of our Getting Started Guides, and then explore the individual labs that explore many advanced features of Docker. For a comprehensive approach to understanding Docker, choose your preferred journey, IT Pros and System Administrators, or Developers.

Getting Started Walk-through for IT Pros and System Administrators

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Learn more about Docker, how it works and how it can help you deploy secure, scalable applications and save money along the way.

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This stage will give you the resources to deploy a production application, developer a strategy for integrating Docker into your production environment, and get recognized as a leader in your organization on implementing Docker. Topics include:

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Learn the core concepts of Docker and how it can make building apps faster, easier, and more secure.

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Or for a full list of individual labs on this site, check out our labs page
Full list of individual labs

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In this tutorial, you'll learn about creating and deploying Docker apps on Windows or Mac using Visual Studio Code, including using multiple containers with a database, and using Docker Compose. You'll also deploy your containerized app to Azure.

Containers are compact virtualized environments, like virtual machines (VMs), that provide a platform for building and running apps, but without the full size and overhead of the complete operating system. Docker is a third-party, industry standard container provider and container management system. Docker Desktop runs on your machine and manages your local containers. Development tools like Visual Studio and VS Code offer extensions that let you to work with a locally installed Docker Desktop service to create containerized apps, deploy apps to containers, and debug apps running on your containers.

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Prerequisites

• Docker Desktop for Windows or Mac.

Start the tutorial

If you've already run the command to get started with the tutorial, congratulations! If not, open a command prompt or bash window, and run the command:

You'll notice a few flags being used. Here's some more info on them:

• -d - run the container in detached mode (in the background)
• -p 80:80 - map port 80 of the host to port 80 in the container
• docker/getting-started - the image to use

Tip

You can combine single character flags to shorten the full command.As an example, the command above could be written as:

The VS Code Extension

Before going too far, we want to highlight the Docker VS Code Extension, which gives you a quick view of the containers running on your machine. It gives you quickaccess to container logs, lets you get a shell inside the container, and lets you easily manage container lifecycle (stop, remove, and so on).

To access the extension, follow the instructions here. Use the Docker icon on the left to open the Docker view. If you open the extension now, you will see this tutorial running! The container name (angry_taussig below) is a randomly created name. So, you'll most likely have a different name.

What is a container

Now that you've run a container, what is a container? Simply put, a container is simply another process on your machine that has been isolated from all other processes on the host machine. That isolation leverages kernel namespaces and cgroups, features that have been in Linux for a long time. Docker has worked to make these capabilities approachable and easy to use.

Note

Creating Containers from ScratchIf you'd like to see how containers are built from scratch, Liz Rice from Aqua Security has a video in which she creates a container from scratch in Go:

What is a container image

When running a container, it uses an isolated filesystem. This custom filesystem is provided by a container image. Since the image contains the container's filesystem, it must contain everything needed to run an application - all dependencies, configuration, scripts, binaries, and so on. The image also contains other configuration for the container, such as environment variables, a default command to run, and other metadata.

We'll dive deeper into images later on, covering topics such as layering, best practices, and more.

Note

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If you're familiar with chroot, think of a container as an extended version of chroot. The filesystem is simply coming from the image. But, a container adds additional isolation not available when simply using chroot.

Next steps

Continue with the tutorial!