Alpine linux on Qemu/KVM as docker playground

configure.sh

#!/bin/sh

setup-timezone -z UTC

cat <<-EOF > /etc/network/interfaces
iface lo inet loopback
iface eth0 inet dhcp
EOF

ln -s networking /etc/init.d/net.lo
ln -s networking /etc/init.d/net.eth0

sed -Ei \
	-e 's/^[# ](rc_depend_strict)=.*/\1=NO/' \
	-e 's/^[# ](rc_logger)=.*/\1=YES/' \
	-e 's/^[# ](unicode)=.*/\1=YES/' \
	/etc/rc.conf

rc-update add acpid boot
rc-update add networking boot
rc-update add net.eth0 boot 
rc-update add net.lo boot
rc-update add chronyd boot 2>/dev/null
rc-update add crond boot 2>/dev/null
rc-update add sshd boot  2>/dev/null
rc-update add docker boot 2>/dev/null

echo 'alpine' > /etc/hostname

### shamelessly ripped off from https://gist.github.com/arvati/7d698d4472c8b2a6a9995b05f168c15a
cat <<'EOTF' > /etc/periodic/15min/motd
#!/bin/sh
#. /etc/os-release
PRETTY_NAME=`awk -F= '$1=="PRETTY_NAME" { print $2 ;}' /etc/os-release | tr -d '"'`
VERSION_ID=`awk -F= '$1=="VERSION_ID" { print $2 ;}' /etc/os-release`
cat > /etc/motd << EOF
%++++++++++++++++++ SERVER INFO ++++++++++++++++++%
%                                                 %
    $PRETTY_NAME - $VERSION_ID
    Kernel: `uname -r`    

    Load: `cat /proc/loadavg | awk '{print $1 ", " $2 ", " $3}'`
    Memory: `free -m | head -n 2 | tail -n 1 | awk {'print  $2'}`M Free: `free -m | head -n 2 | tail -n 1 | awk {'print $4'}`M 
    Disk: `df -h / | awk '{ a =  $2 } END { print a }'` Free: `df -h / | awk '{ a =  $4 } END { print a }'`
%                                                  %
%++++++++++++++++++++++++++++++++++++++++++++++++++%
EOF
EOTF
chmod a+x /etc/periodic/15min/motd
run-parts --test /etc/periodic/15min

chsh --shell /bin/bash root

cat <<'EOF' > /root/.bash_profile
PS1="\u@\h:\w${_p} # "
export EDITOR=/usr/bin/nano
alias ll='ls -allh'
EOF

mkdir /root/.ssh

cat <<'EOF' > /root/.ssh/authorized_keys
ADD_YOUR_SSH_KEYS
EOF

create-vm.sh

#!/bin/sh
HOSTNAME=alpine
VCPU_COUNT=4
MEM_SIZE=8192
DISK_SPACE=40

echo "Cleaning up!"
## clean up previous
sudo virsh destroy ${HOSTNAME} 2>/dev/null
sudo virsh undefine ${HOSTNAME} 2>/dev/null
sudo virsh vol-delete --pool default ${HOSTNAME} 2>/dev/null
sudo virsh vol-delete --pool default ${HOSTNAME}.qcow2 2>/dev/null

sudo alpine-make-vm-image --image-format qcow2 --image-size ${DISK_SPACE}G \
    --repositories-file repositories \
    --packages "$(cat packages)" \
    --script-chroot ${HOSTNAME}.qcow2 -- configure.sh

# Get the image size
sudo qemu-img info --output json ${HOSTNAME}.qcow2 | jq -r .[\"virtual-size\"]

# Get the image type
sudo qemu-img info --output json ${HOSTNAME}.qcow2 | jq -r .format

sudo virsh vol-create-as default ${HOSTNAME} ${DISK_SPACE}G --format qcow2
sudo virsh vol-upload --pool default --vol ${HOSTNAME} ./${HOSTNAME}.qcow2

VOL_PATH=`sudo virsh vol-path --pool default --vol ${HOSTNAME}`

## Install
sudo virt-install --name ${HOSTNAME} \
    --os-variant alpinelinux3.19 \
    --vcpus ${VCPU_COUNT} \
    --memory ${MEM_SIZE} \
    --disk pool=default,size=${DISK_SPACE},backing_store=${VOL_PATH},backing_format=qcow2,format=qcow2 \
    --import \
    --graphics vnc \
    --network default,model=virtio \
    --noautoconsole

## cleanup disk image
rm ${HOSTNAME}.qcow2

packages

alpine-base
bash
ca-certificates
chrony
coreutils
curl
docker
docker-cli-compose
git
grep
htop
iproute2
iputils
nano
openssh
qemu-guest-agent
rsync
shadow
sudo

repositories

https://nl.alpinelinux.org/alpine/edge/main
https://nl.alpinelinux.org/alpine/edge/community
@testing http://nl.alpinelinux.org/alpine/edge/testing

Depends on proper install of

• Qemu/KVM
• qemu-nbd
• alpine-make-vm-image
• jq