Bring-up instructions for alpine VM with docker

Setup VM

Install and run alpine linux. follow through with the setup procedure (setup-alpine)
Login as root user.

#### Install sudo ####
apk is the default package manager.
apk update  <-- updates to the latest packages.
apk add sudo <-- installs sudo

#### Install docker ####

vi /etc/apk/repositories and uncomment http://dl-cdn.alpinelinux.org/alpine/edge/community and save
apk update 
apk add docker <-- installs docker
rc-update add docker boot <-- to start docker at boot time
service docker start <-- start docker service manually
#Note: On older version of Alpine Linux with older version of docker you'll also need to disable some kernel security flags in order to build images:
  sysctl -w kernel.grsecurity.chroot_deny_chmod=0
  sysctl -w kernel.grsecurity.chroot_deny_mknod=0
apk add py-pip <-- install python pip
pip install docker-compose <-- install docker compose
apk del py-pip <-- we no longer require this package.
More info here: https://wiki.alpinelinux.org/wiki/Docker


#### Configure sshd ####
vi /etc/ssh/sshd_config 
Port 22 <-- uncomment this
PermitRootLogin yes <-- add this if you want ssh access to root
save
service sshd restart <-- restart the shh daemon

#### Create non sudo user ####
adduser potato <-- provide requested details such as pwd etc.

#### Mechanism to allow non sudo user to change ip ####

vi setip
#!/bin/sh

usage() {
    echo "setip"
    echo "usage: setip IPADDRESS"
    echo "Configures the eth0 interface with specified IP address"
}

if [ $# -ne 1 ]; then
    usage
    exit 1
fi

IPADDR=$1

ifconfig eth1 $IPADDR

save this file in /usr/local/bin/

chmod +x /usr/local/bin/setip <-- give execute permission

visudo <-- open sudoers file
Add the below line to it.
potato ALL = NOPASSWD: /home/potato/bin/setip <--allow potato userto execute setip executable
save
More info here: https://forums.fedoraforum.org/showthread.php?180471-Editing-sudoers-to-allow-ifconfig-only-on-certain-interfaces
potatop user can now setip using: sudo setip 1.2.3.4


apk add bash <-- install bash shell (reqd for some custom written scritps)
apk add bash-completion <-- bash automatic command completion
apk add inotify-tools <--for the filewatcher methods
apk add openssl <--for encryption