[TBD]Alpine Linux

Introduction

Steps to install Alpine docker container

Alpine docker setup

Pull alpine image

root@ubuntu:/personal# docker pull alpine

Using default tag: latest

latest: Pulling from library/alpine

Digest: sha256:3dcdb92d7432d56604d4545cbd324b14e647b313626d99b889d0626de158f73a

Status: Image is up to date for alpine:latest

Verify that image is loaded

root@ubuntu:/personal# docker images | grep alpine

alpine latest 4e38e38c8ce0 22 hours ago 4.799 MB

Create an alpine docker instance

root@ubuntu:/personal/# docker run -dt --name alpine_docker alpine:latest /bin/ash

25078442f25706372f4a06455ff721764a32c3f7e97de031ec667b510d38921e

root@ubuntu:/personal# docker ps | grep alpine_docker

25078442f257 alpine:latest "/bin/ash" 10 seconds ago Up 9 seconds alpine_docker

Execute alpine docker instance

root@ubuntu:/personal# docker exec -it alpine_docker /bin/ash

/ # ls

bin dev etc home lib linuxrc media mnt proc root run sbin srv sys tmp usr var

/ #

Alpine package management

It is done using apk command

Handling dependency installation for cffi package installation

Error on running apk install cffi:

gcc -fno-strict-aliasing -Os -fomit-frame-pointer -g -DNDEBUG -Os -fomit-frame-pointer -g -fPIC -DUSE__THREAD -I/usr/include/ffi -I/usr/include/libffi -I/usr/include/python2.7 -c c/_cffi_backend.c -o build/temp.linux-x86_64-2.7/c/_cffi_backend.o

c/_cffi_backend.c:13:17: fatal error: ffi.h: No such file or directory

#include <ffi.h>

^

compilation terminated.

Resolution:

apk add --no-cache libffi-dev build-base py2-pip python2-dev && pip install cffi

Useful link: https://github.com/gliderlabs/docker-alpine/issues/297

Install curl package

cURL package installation

# apk update

fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/main/x86_64/APKINDEX.tar.gz

v3.7.0-151-gf417903f18 [http://dl-cdn.alpinelinux.org/alpine/v3.7/main/]

OK: 5744 distinct packages available

bash-4.4# apk add curl

(1/3) Installing libssh2 (1.8.0-r2)

(2/3) Installing libcurl (7.59.0-r0)

(3/3) Installing curl (7.59.0-r0)

Executing busybox-1.27.2-r7.trigger

OK: 257 MiB in 57 packages

bash-4.4#

Install openssl package

Add openssl package

bash-4.4# apk add openssl

(1/1) Installing openssl (1.0.2o-r0)

Executing busybox-1.27.2-r7.trigger

Executing ca-certificates-20171114-r3.trigger

OK: 257 MiB in 58 packages

Using alpine docker images with python installed

Example of Dockerfiles using python based on alpine

google519822_student@k8s-workshop-module-1-lab:/kickstart$ cat Dockerfile

# A docker base image based on alpine linux with python 3.6.0 pre-installed.

# Docker images can be stacked on top of each other.

FROM library/python:3.6.0-alpine

# Install tornado library.

RUN pip install tornado

# Copy the webserver python app.

ADD web-server.py /web-server.py

# Set the default execution command for this image.

Reference

https://www.youtube.com/watch?v=axlAUkKzbx8