Alpine on Ubuntu notes

README.md

open terminal in Ubuntu
Note: I'm using Ubuntu 18

create any working folder somewhere, and cd to that folder, e.g. abc

mkdir abc && cd abc

intialize a git local git repo for source tracking (use at own discretion)

Note: Install git before running this command https://git-scm.com/downloads

git init

create folder alpine3.11.3 it will contain the Dockerfile and host/guest folder called shared, where

mkdir alpine3.11.3
mkdir alpine3.11.3/shared

create alpine3.11.3/Dockerfile:

FROM alpine:3.11.3
LABEL maintainer="phpnix+docker@code-sharp.com"
LABEL comment="base os alpine:3.11.3"

build the alpine3.11.3/Dockerfile (from parent folder) tag it alpinebase
Note: This requires Docker https://docs.docker.com/install/

docker build -t alpinebase alpine3.11.3/.

run and open shell repl in docker image

docker run -it alpinebase

verify the distro is alpine

/ # cat /etc/*-release

[Output]

3.11.3
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.11.3
PRETTY_NAME="Alpine Linux v3.11"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://bugs.alpinelinux.org/"

list the files in the docker instance, redirect to shared/files.txt

docker run alpinebase ls -lR > ./alpine3.11.3/shared/files.txt

the result is a file of files in host/guest shared folder

head ./alpine3.11.3/shared/files.txt
.:
total 56
drwxr-xr-x    2 root     root          4096 Jan 16 21:52 bin
drwxr-xr-x    5 root     root           340 Feb 29 15:36 dev
drwxr-xr-x    1 root     root          4096 Feb 29 15:36 etc
drwxr-xr-x    2 root     root          4096 Jan 16 21:52 home
drwxr-xr-x    5 root     root          4096 Jan 16 21:52 lib
drwxr-xr-x    5 root     root          4096 Jan 16 21:52 media
drwxr-xr-x    2 root     root          4096 Jan 16 21:52 mnt
drwxr-xr-x    2 root     root          4096 Jan 16 21:52 opt

clone the docker file for upgrading

cp alpine3.11.3 alpine3.11.3.up 

edit alpine3.11.3.up/Dockerfile, add the update upgrade:

FROM alpine:3.11.3
LABEL maintainer="phpnix+docker@code-sharp.com"
LABEL comment="base alpine:3.11.3 w update upgrade"
RUN apk --update add \
    && apk upgrade \
    && rm /var/cache/apk/*

build new image with update upgrade tag it alpineup

docker build -t alpineup alpine3.11.3.up/.

list the files in the docker instance, redirect to shared/files.txt

docker run alpineup ls -lR > ./alpine3.11.3.up/shared/files.txt

compare the files from the plain to the updated, using colorized output

diff --color ./alpine3.11.3.up/shared/files.txt ./alpine3.11.3/shared/files.txt