feat: add compose task

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 "<name>:<tag>" .`
-
-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`

Tasks/5.Using volumes/README.md

@@ -1,17 +1,17 @@
 # Practice - using volumes
 
-Run a container "mypsql" using **postgres:12** with options to:
- - run the container in detached mode
- - pass an environment variable `POSTGRES_PASSWORD=secretpass`
- - create a named volume with `-v <name>:/var/lib/postgresql/data`
+Run a container **mypsql** using **postgres:12** with options to:
+ - run in detached mode
+ - pass the appropriate environment variable (find it on https://hub.docker.com/)
+ - use a named volume
 
-Run a shell in the container and use psql to add a table and a record:
+Run bash in the container and use psql to add a table and a record:
  - $ `psql -U postgres`
  - $ `create table public.films (id int PRIMARY KEY, name varchar(255));`
  - $ `insert into films(id, name) values(1, 'Some movie');`
 
-Exit the container and delete it. Run a new container with the same options. Use ***the same*** volume name to re-use the existing volume.
+Exit the container and delete it. Run a new container with the same options (use ***the same*** volume name).
 
-Run a shell inside the container and see if your data is still there:
+Run bash inside the new container and see if your data has survived:
  - $ `psql –U postgres`
  - $ `select * from public.films;`

Tasks/6.Compose/README.md

@@ -0,0 +1,7 @@
+# Practice - Docker Compose
+
+## Fix _docker-compose.yml_ and ensure the Voting app is working properly
+ - Review the Voting app [diagram](./voting-app.png)
+ - Fix [docker-compose.yml](./docker-compose.yml)
+ - Execute command: docker-compose up
+ - Ensure the Voting app is working properly

Tasks/6.Compose/docker-compose.yml

@@ -0,0 +1,47 @@
+version: "2"
+
+services:
+  vote:
+    image: dockersamples/examplevotingapp_vote:latest
+    networks:
+      - front-end-subnet
+    ports:
+      - "80:80"
+
+  # Hint: On which port the container is listening?
+  result:
+    image: dockersamples/examplevotingapp_result:latest
+    networks:
+      - back-end-subnet
+    ports:
+      - "8080:8080"
+
+  # Hint: What network is going to be attached to the worker service?
+  worker:
+    image: dockersamples/examplevotingapp_worker:latest
+    depends_on:
+      - "redis"
+      - "db"
+
+  # Hint: Should we care about the service name?
+  redis-mredis:
+    image: redis:3.2
+    networks:
+      - front-end-subnet
+
+  # Hint: environment variable should be set to allow connections without setting database password
+  db:
+    image: postgres:9.4
+    networks:
+      - back-end-subnet
+    volumes:
+      - db-data:/var/lib/postgresql/data
+
+# Hint: Do we need volumes section?
+
+# Hint: Do we need special network drivers to run the app?
+networks:
+  front-end-subnet:
+    driver: custom
+  back-end-subnet:
+    driver: bridge