psql in docker - danysoft · psql in docker what is docker? why containers? why not use virtual...

Confidential © 2016 Actian Corporation1 Confidential © 2016 Actian Corporation Version 0.2

PSQL In DockerLearn how to create and use PSQL containers using Docker.

Tom Bates, Principal Software Development Engineer, ActianActian Technical User Group ConferenceOctober 2016

Confidential © 2016 Actian Corporation2

This document is for informational purposes only and is subject to change at any time without notice. The information in this document is proprietary to Actian and no part of this document may be reproduced, copied, or transmitted in any form or for any purpose without the express prior written permission of Actian.

This document is not intended to be binding upon Actian to any particular course of business, pricing, product strategy, and/or development. Actian assumes no responsibility for errors or omissions in this document. Actian shall have no liability for damages of any kind including without limitation direct, special, indirect, or consequential damages that may result from the use of these materials. Actian does not warrant the accuracy or completeness of the information, text, graphics, links, or other items contained within this material. This document is provided without a warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability, fitness for a particular purpose, or non-infringement.


PSQL In Docker

What is Docker?

Why Containers?

Why Not Use Virtual Machines?

PSQL in a Docker Container

PSQL CLI in a Docker Container

PSQL PCC in a Docker Container

Demonstrations

Questions And Answers


Docker is one of the world's leading software containerization platforms.

Docker containers wrap a piece of software in a complete filesystem that contains everything needed to run.

■ Code, runtime, system tools, system libraries.

■ Anything that can be installed on a server.

■ Guarantees that the software will always run the same, regardless of its environment.

Open.

■ Docker containers are based on open standards, enabling containers to run on all major Linux distributions, Mac OSX and Microsoft Windows.

What is Docker?


PSQL In Docker

What is Docker?

Why Containers?





Demonstrations



Lightweight.

■ Containers running on a single machine share the same operating system kernel.

■ They start quickly and use less RAM.

■ Images are constructed from layered filesystems and share common files, making disk usage and image downloads much more efficient.

Secure by default.

■ Containers isolate applications from one another and the underlying infrastructure, while providing an added layer of protection for the application.

Why Containers?


PSQL In Docker

What is Docker?

Why Containers?







Containers and virtual machines have similar resource isolation and allocation benefits but a different architectural approach.

■ Containers are more efficient.

Virtual machines include the application, the necessary binaries and libraries, and an entire guest operating system.

■ Can amount to tens of GBs.

Containers include the application and all of its dependencies but share the kernel with other containers.

■ They run as isolated processes in user space on the host operating system.



PSQL In Docker

What is Docker?

Why Containers?





Demonstrations



Docker Lifecycle.

1. Write a Dockerfile for a command.

2. Build an image from the Dockerfile.

3. Run the command in a new container.

4. Stop the running container.

5. Start the stopped container.

6. Remove the container.

7. Remove the image.



The Dockerfile.

■ -

PSQL CLI in a Docker Container (cont’d)


Build the image from the Dockerfile.

■ docker build --rm=true --force-rm -t psqlcli .

• -rm=true - Remove intermediate containers after a successful build.

• --force-rm - Always remove intermediate containers.

• -t - Name and optionally a tag in the 'name:tag' format.

• . - Path to the Dockerfile.



Run the command in a new container.

■ docker run --tty --interactive --attach=STDIN --attach=STDOUT --attach=STDERR --name psqlcli psqlcli

• --tty - Allocate a pseudo-TTY.

• --interactive - Keep STDIN open even if not attached.

• --attach - Attach to STDIN, STDOUT or STDERR.

• --name - Assign a name to the container.

• psqlcli - The image.

■ -



Run the command in a new container (cont’d).

■ -



Stop the running container.

■ docker stop psqlcli

Start the stopped container.

■ docker start -i -a psqlcli

• -i - Attach container's STDIN.

• -a - Attach STDOUT/STDERR and forward signals.

■ -

Remove the container.

■ docker rm psqlcli



Remove the image.

■ docker rmi psqlcli



PSQL In Docker

What is Docker?

Why Containers?





Demonstrations



The Dockerfile.

■ -




■ docker build --rm=true --force-rm -t pcc .


■ docker run --name pcc -e DISPLAY=:0 -v /tmp/.X11-unix/X0:/tmp/.X11-unix/X0 pcc

• -e - Set environment variables.

• -v - Bind mount a volume.

PSQL PCC in a Docker Container (cont’d)



■ -




■ docker stop pcc




■ docker start pcc

■ -


State is retained.



■ docker rm pcc

Remove the image.

■ docker rmi pcc



PSQL In Docker

What is Docker?

Why Containers?





Demonstrations



The Dockerfile.

■ -



The Docker Command - “run_psql”.

■ -

PSQL in a Docker Container (cont’d)


The Docker Command - “run_psql” (cont’d).

■ -




■ docker build --rm=true --force-rm -t psql .


■ docker run --detach --name psql -p 1583:1583 -p 3351:3351 -e license= psql

• --detach - Run container in background and print container ID.

• -p - Publish a container's port(s) to the host.

■ -




■ docker stop psql


■ docker start psql


■ docker rm psql

Remove the image.

■ docker rmi psql



Attach to the container.

■ docker attach --sig-proxy=false psql

• --sig-proxy - Proxy all received signals to the process.

■ -



Run a command in a running container.

■ docker exec –i -t psql bash

• -i - Keep STDIN open even if not attached.

• -t - Allocate a pseudo-TTY.

■ -



What’s the container’s IP address?

■ docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' psql

• --format - Format the output using the given go template.

■ -



List the images.

■ docker images --all

• --all - Show all images (default hides intermediate images)

■ -

List the containers.

■ docker ps --all

• --all - Show all containers (default shows just running)

■ -



PSQL In Docker

What is Docker?

Why Containers?





Demonstrations



Thank You!

psql in docker - danysoft · psql in docker what is docker? why containers? why not use virtual...

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