Docker helloworld.go

What?

Compile a go application, build it into a container and run it. Simple! This also shows how a configuration value ('YOURNAME') can be passed from the docker command line to the container on startup.

Prerequisite

To run this aardvark.code example you need to have following software installed on your system:

• golang
• docker
• aardvark.

Go aardvark

Grab this aardvark.code file:

wget http://data.munging.ninja/aardvarkcode/docker/aardvark.code

Execute

Output of the 'build' :

--- Compiling -----------------------------------------------
--- Build container -----------------------------------------
Sending build context to Docker daemon 75.15 MB
Sending build context to Docker daemon 
Step 0 : FROM debian
 ---> 37c816ae4431
Step 1 : COPY helloworld .
 ---> bd81fc9a712e
Removing intermediate container 49887fffeea8
Step 2 : RUN chmod +x ./helloworld
 ---> Running in 52600566c5e8
 ---> 166b57edb033
Removing intermediate container 52600566c5e8
Step 3 : ENTRYPOINT ./helloworld
 ---> Running in 3e274e23d561
 ---> 952283f977f7
Removing intermediate container 3e274e23d561
Successfully built 952283f977f7

Output of running the container:

--- Run container -------------------------------------------
Yo CarréConfituurke, today is Saturday!

The aardvark.code

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##== tmp/helloworld.go =========================================================
package main

import (
    "fmt"
    "time"
    "os"
)

func main() {
    day := time.Now().Weekday()
    name:=os.Getenv("YOURNAME")
    fmt.Printf("Yo %v, today is %v!\n", name, day) 
}

##== tmp/helloworld.dockerfile =================================================
FROM debian
COPY helloworld . 
ENTRYPOINT [ "./helloworld" ]

##== aardvark.sh ===============================================================
#!/bin/bash 

echo "--- Compiling -----------------------------------------------"
go build tmp/helloworld.go 

echo "--- Build container -----------------------------------------"
docker build -f tmp/helloworld.dockerfile -t helloworld:v1 .

echo "--- Run container -------------------------------------------"
docker run -e YOURNAME=CarréConfituurke  helloworld:v1