From c07fcd760ab48a954b046ac12f40c03892a6104b Mon Sep 17 00:00:00 2001 From: Varban Andreev Date: Mon, 11 May 2020 19:35:53 +0300 Subject: [PATCH] Update readme --- Tasks/4.Building images/README.md | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) diff --git a/Tasks/4.Building images/README.md b/Tasks/4.Building images/README.md index 76df794..0b63eb3 100644 --- a/Tasks/4.Building images/README.md +++ b/Tasks/4.Building images/README.md @@ -1,22 +1,20 @@ # Practice - building images -Your project utilizes microservices and Kuberenetes. On your cluster you have many containers (pods) with your services. There's a special container which runs Ubuntu and can access the other services' databases and other components. To access those components you install a few CLI tools on this special container. The problem - each time the cluster is re-deployed you must install the CLI tools again because they're not part of the container's base Ubuntu image. +Your project utilizes microservices and Kuberenetes. On your cluster you have many containers (pods) with your services. There’s a special container **jumpbox** which runs Ubuntu and can access the other services' databases and other components. To access those components you install a few CLI tools on this special container. The problem - each time the cluster is re-deployed you must install the CLI tools again because they're not part of the container's base Ubuntu image. -You want to automate this process by building a Dockerfile for this container using ubuntu:18.04 as your base image. +You want to automate this process by building a Dockerfile for this container using **ubuntu:18.04** as your base image. To install those tools you normally use the following commands: -- $ `DEBIAN_FRONTEND=noninteractive` # Env var required for postgres +- $ `DEBIAN_FRONTEND=noninteractive` # Env var required for postgres installation - $ `apt-get update && apt-get install -y postgresql` # Install postgres to access dbs - $ `apt-get install -y wget` # Install wget for downloading software packages - $ `apt-get install -y curl` # Install curl for running HTTP requests -:whale: HINT: Research how to set environment variables inside Dockerfiles for the DEBIAN_FRONTEND variable. - -To build the image, navigate to your Dockerfile path and use - - `docker build –t ":" .` - -Run a container from this image in interactive mode and verify the installations: +1. Create the above Dockerfile and build an image **jumpbox** with a **1.0** tag. Run a container with interactive bash and verify the installations: - `psql --version` # You should see the psql version - `wget --version` # You should see the wget version and other info - `curl 'http://example.com'` # You should see some html +2. Change **curl** to **inetutils-ping**. Build a jumpbox version **2.0** and test again: +- `psql --version` +- `ping 8.8.8.8`