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In order to create a pre-populated database we need to create a Dockerfile. What this also means is that you can easily spin up such a container (and shut it down). This can be a simple or a complex database structure and schema. However, the real power of Docker is when you want to easily provision a database that has already content in it. But as you can see the database is completely empty. Once connected you can do anything you want with the database (Create tables, load data etc).

You need to use the following connection details to actually connect to the DB: Now you can connect to this brand new Postgres database in any tool that allows you to communicate with databases. the -name property gives your container a name and means you can easily find it back.

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This is the password that gives you access to your database

POSTGRES_PASSWORD sets the password to docker.

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-p plus the port numbers means you map the containers port 5432 to the external port 5432 - this allows you to connect to it from the outside.

-d means that you enable Docker to run the container in the background.

Last section of the command grabs the latest 'postgres' Docker image from the Docker Hub.

Hands down the easiest way of running a clean Postgres database is by running this command in a terminal window (after Docker has been installed):Įnter fullscreen mode Exit fullscreen mode If this is the case you can quickly follow the 'Hello World' example to get up and running. You can check if it's working when there is a Docker icon (the whale or ship like image with containers) on the top right next to your other small icons. Then you double click the Docker.app and it should start.

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You download the app and drag it to Applications. For a Mac (and I think also for Windows) the installation is fairly straightforward. Windows installation instructions can be found here.

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For this tutorial we're going to install Docker on a Mac. You can either install Docker on a Desktop machine (both Windows and Mac), or on a server (Linux based installations). In order to use Docker you first need to install it. Docker therefore allows you to automate the deployment of applications in these containers.Įnough theory, let's jump into installing Docker and firing up a Postgres database. Whilst when you install Docker, you are going to use the Docker Engine to create isolated entities on the OS. Therefore, the big difference between VMs and Docker containers is that the former can have multiple (Guest) Operating Systems on the same hardware, through for example VMWare (which is called a Hypervisor). In a VM you can have multiple Operating Systems running on the same hardware, whilst with Docker you virtualise the Operating System. Docker doesn't do that and does it differently. What these cloud environments are doing is 'virtualise' the hardware. Whenever you create a VM you are sharing the hardware with others and other VMs. The latter often runs in cloud environments like AWS and Azure. With Docker, you can manage your infrastructure in the same ways you manage your applications."įor fully understanding Docker we also need to talk about the difference between Docker and a Virtual Machine (VM).

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Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. Along the way you also learn some Docker specific lingo.Īccording to the official docs, Docker is and " open platform for developing, shipping, and running applications. My question is this: Can Razor support a script and avoid prompting for variables?ĮDIT: I realize I could use a common table expression for my variables, but it's not real pretty as I have about 20 queries per script, some of which having many table joins.Have you ever had the problem where a tool or a piece of software works fine on your machine, but the moment you install it on someone else's you get all kinds of issues? Well, I have, and particularly for this reason Docker was invented! In this blog post we will take a quick look at what Docker is and how easy it is to run a database in a Docker container. Where log_date between to_date(&start_date,'yyyy/mm/dd') and to_date(&end_date,'yyyy/mm/dd') The following works in Razor, using the prompt-for feature with the variables when running as SQL statement: -query Where log_date between and employee_id = by (emp_id) Sample that works as desired in pgAdmin when running as pg-script: -declare variables 6.3.29) and trying to adapt some pgAdmin scripts over to Razor.