airship/berth
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helm.log
berth-0.1.0.tgz

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# This Makefile is used during development and can usually be ignored
# by most people.
all: test
default: test
test: install
install: build
@echo
-helm delete --purge berth >>helm.log 2>&1
@echo
@[ -f override.yaml ] || touch override.yaml
helm install ./berth-0.1.0.tgz --values=override.yaml --name=berth >>helm.log 2>&1
@sleep 5.0 # give k8s a chance to see the IP
@echo
kubectl get pods -o wide
build:
@echo
helm lint berth
@echo
helm package berth
clean:
rm -f berth-0.1.0.tgz helm.log
.PHONY:
all default build clean

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Berth is a deliberately minimalist VM runner for Kubernetes.
I'm not 100% sold on the name; before merging we could change it...
## TL;DR Installation Guide
```
# Make sure you have Helm 2.5.x and Kubernetes 1.6.x
#
# edit values.yaml; set class_name and ssh key
#
helm package berth
helm install --name=berth ./berth-0.1.0.tgz # ...
kubectl get pods -o wide
```
You should be able to SSH to your VM at the Kubernetes IP for the
container which you can retrieve with `kubectl get all -o wide`. VNC
access is available on port 5900.
```
ssh -i ./you-ssh-private-key root@ip.of.vm.pod
```
<!-- https://mostsecure.pw/ -->
### Example
[Quick installation / sample](https://asciinema.org/a/4VazbwsokL3zpnGPf27eyFIfe)
### Why this?
The requirements are very narrow right now and the existing
alternatives don't align well at present. This will likely change in
time at which point we can realign the internal implementation.
#### Minimalist requirements
* Run VMs from inside of Kubernetes
* Work with Calico
* Have VM life-cycle match that of pods
* Have VMs benefit from Kubernetes resiliency
* Allow for persistent storage
* Allow for state injection/access from a ConfigMaps
## Requirements:
* Helm 2.5.x
* Kubernetes 1.6.x
This does not need to be installed as part of the OpenStack chart
collection.
## How it works:
At a high level, it works like this:
* Create a SNAT/DNAT enabled linux bridge.
* Assign the bridge a private IP address from a small /30 subnet
(controlled with `VM_IP` and `VM_GW`)
* Plug the VM network interface into the bridge.
* Run a dnsmasq process to allocate the VM the right name-servers, and
DNS search strings extracted from the parent container. Assign the
private IP address to the VM and have it use the bridges IP as its
default gateway.
* Setup SNAT/DNAT on the parent container to do 1:1 mapping of all
ports, all protocols to the VM, except for TCP:5900 to allow for VNC
access (can be controlled with NO_VNC environment variable).
* At this point, VM essentially assumes Pod Assigned IP.
* Feed any meta-data or user-data down into the VM by leveraging these
ConfigMap mounts with the same name and turning them into an ISO
presented to the guest.
The startvm entry-point supports several environment variables:
* `IMG_SOURCE` which is an http or https URL that contains a qcow2
image. It can also be a full path to a local file baked into the
container image, e.g. "/image.qcow"
* `IMG_TARGET` the name to save the image above as in the shared
volume.
It also supports two files, which should be mounted as ConfigMaps if
using Kubernetes at `/userdata` and `/metadata` as YAML files
containing, obviously meta-data and user-data as YAML that will be fed
to the VM as a config-drive iso.
The "pet" version of the image, which is created using qemu-img -b to
base it on the source, is stored in a separate volume dedicated to the
VM itself, and named after the container hostname.
There are a few other parameters you can control as an operator:
* `VM_IP` is the IP address the VM should be allocated by DHCP. The
container will 1:1 NAT except for port 5900 for VNC access (defaults
to 192.168.254.2)
* `VM_GW` is the gateway IP address the VM should use for its default
route (defaults to 192.168.254.1)

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[Put these in Jira]
*Require* ssh key, throw an error if missing.
Chart definition vs values.yaml:
Move image source/target details from chart to values
(IMG_SOURCE/IMG_TARGET)
Move the VM definitions entirely into the values.yaml file; have
helm deployment process iterate over that creating multiple pods,
one for each VM.
Ideally this will allow incremental updates of pods without having
to know about the chart internals.
XXX Get examples of where we've done this before from Alan XXX
Add Dockerfile; update the container image we use to Ubuntu 16.04 with
a suitable KVM/Qemu.
Consider moving to stateful sets for cleaner PVC associations. See
OSH MariaDB chart for an example of this.

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apiVersion: v1
description: Minimalist VMs on Kubernetes
name: berth
version: 0.1.0
icon: https://upload.wikimedia.org/wikipedia/commons/6/62/Anchor_pictogram.svg

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dependencies: []

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#!/bin/bash
set -x
echo "VER-0.1.0-1.2"
# Returns the integer representation of an IP arg, passed in ascii
# dotted-decimal notation (x.x.x.x)
atoi() {
IP=$1; IPNUM=0
for (( i=0 ; i<4 ; ++i )); do
((IPNUM+=${IP%%.*}*$((256**$((3-${i}))))))
IP=${IP#*.}
done
echo $IPNUM
}
# Returns the dotted-decimal ascii form of an IP arg passed in integer
# format
itoa() {
echo -n $(($(($(($((${1}/256))/256))/256))%256)).
echo -n $(($(($((${1}/256))/256))%256)).
echo -n $(($((${1}/256))%256)).
echo $((${1}%256))
}
generate_cloud_drive() {
metadata=/metadata
if [ ! -f $metadata ]; then
metadata=""
fi
userdata=/userdata
if [ ! -f $userdata ]; then
userdata=""
fi
if [ "$metadata" == "" -a "$userdata" == "" ]; then
return
fi
TMPDIR=`mktemp -d -t aicvm.XXXXXX`
if [ $? -ne 0 ]; then
echo "Fail to create temporaily directory"
exit 1
fi
# create form of config drive
mkdir -p ${TMPDIR}/openstack/2012-08-10
OLD_PWD=$PWD
cd ${TMPDIR}/openstack
ln -s 2012-08-10 latest
cd $OLD_PWD
if [ -f $metadata ]; then
cp $metadata ${TMPDIR}/openstack/2012-08-10/meta_data.json
fi
if [ -f $userdata ]; then
cp $userdata ${TMPDIR}/openstack/2012-08-10/user_data
fi
iso="cloud-drive.iso"
mkisofs -R -V config-2 -o $iso ${TMPDIR}
if [ $? -ne 0 ]; then
echo Fail to create cloud-drive ISO image for cloud-init
exit 1
fi
echo $iso
}
# Generate random new MAC address
hexchars="0123456789ABCDEF"
end=$( for i in {1..8} ; do echo -n ${hexchars:$(( $RANDOM % 16 )):1} ; done | sed -e 's/\(..\)/:\1/g' )
NEWMAC=`echo 06:FE$end`
# These two variables can be overwritten
: ${KVM_BLK_OPTS:="-drive file=\$KVM_IMAGE,if=none,id=drive-disk0,format=qcow2 \
-device virtio-blk-pci,scsi=off,drive=drive-disk0,id=virtio-disk0,bootindex=1"}
: ${KVM_RAW_BLK_OPTS:="-drive file=\$KVM_IMAGE,if=none,id=drive-disk0,format=raw \
-device virtio-blk-pci,scsi=off,drive=drive-disk0,id=virtio-disk0,bootindex=1"}
: ${KVM_NET_OPTS:="-netdev bridge,br=\$BRIDGE_IFACE,id=net0 \
-device virtio-net-pci,netdev=net0,mac=\$NEWMAC"}
# define some valeus for the VM side of the networking but
# allow them to be overriden by the operator
: ${VM_IP:="192.168.254.2"}
: ${VM_GW:="192.168.254.1"}
# the netmask is not definable, as we leverage
# /30 elsewhere
VM_NETMASK="255.255.255.252"
# For debugging
if [ "$1" = "bash" ]; then
exec bash
fi
# Pass Docker command args to kvm
KVM_ARGS=$@
# Create the qcow disk image on the Docker volume named /image, using
# the compressed qcow image that came with Docker image as the base.
# Docker volumes typically perform better than the file system for
# Docker images (no need for overlay fs etc.)
if [ -e /dev/vm/root ]; then
KVM_BLK_OPTS="$KVM_RAW_BLK_OPTS"
KVM_IMAGE=/dev/vm/root
else
if [ -e "${IMG_TARGET}" ]; then
BASE=${IMG_TARGET}
else
if [ ! -d "/image" ]; then
echo "/image directory does not exist, failed to mount volume?"
exit 2
fi
if [ ! -e "/image/${IMG_TARGET}" ]; then
echo "Fetching missing image target"
curl ${IMG_SOURCE} > /image/${IMG_TARGET}
fi
BASE=/image/${IMG_TARGET}
fi
if [ ! -d "/image" ]; then
echo "/image directory does not exist, failed to mount volume /image?"
exit 2
fi
if [ -z "${HOSTNAME}" ]; then
echo "Could not find HOSTNAME var. Did you specify a HOSTNAME environment variable?"
fi
KVM_IMAGE=/image/${HOSTNAME}.qcow2
if [ -e "${KVM_IMAGE}" ]; then
echo "Image ${KVM_IMAGE} already exists. Not recreating"
else
qemu-img create -f qcow2 -b ${BASE} \
$KVM_IMAGE > /dev/null
if [[ $? -ne 0 ]]; then
echo "Failed to create qcow2 image"
exit 3
fi
fi
fi
VOLUMES_DIR="/volumes/"
VOLUMES_LIST=`find $VOLUMES_DIR -name "*.img" | sort -d`
extra_kvm_blk_opts=""
for volume in $VOLUMES_LIST /dev/vm/disk* ; do
if [ -e $volume ]; then
extra_kvm_blk_opts=$extra_kvm_blk_opts" -drive file=$volume,if=virtio,format=raw"
fi
done
KVM_BLK_OPTS=$KVM_BLK_OPTS$extra_kvm_blk_opts
# Network setup:
#
# 1. Create a bridge named br0
# 2. Remove IP from eth0, save eth0 MAC, give eth0 a random MAC
IFACE=eth0
BRIDGE_IFACE=br0
cidr2mask() {
local i mask=""
local full_octets=$(($1/8))
local partial_octet=$(($1%8))
for ((i=0;i<4;i+=1)); do
if [ $i -lt $full_octets ]; then
mask+=255
elif [ $i -eq $full_octets ]; then
mask+=$((256 - 2**(8-$partial_octet)))
else
mask+=0
fi
test $i -lt 3 && mask+=.
done
echo $mask
}
setup_bridge_networking() {
MAC=`ip addr show $IFACE | grep ether | sed -e 's/^[[:space:]]*//g' -e 's/[[:space:]]*\$//g' | cut -f2 -d ' '`
HOST_IP=`ip addr show dev $IFACE | grep "inet $IP" | awk '{print $2}' | cut -f1 -d/`
HOST_CIDR=`ip addr show dev $IFACE | grep "inet $IP" | awk '{print $2}' | cut -f2 -d/`
HOST_NETMASK=`cidr2mask $HOST_CIDR`
HOST_GATEWAY=`ip route get 8.8.8.8 | grep via | cut -f3 -d ' '`
NAMESERVER=( `grep nameserver /etc/resolv.conf | grep -v "#" | cut -f2 -d ' '` )
NAMESERVERS=`echo ${NAMESERVER[*]} | sed "s/ /,/"`
SEARCH=( `grep -E ^search /etc/resolv.conf | grep -v "#" | cut -f2- -d ' ' | tr ' ' ','` )
# we must enable forwarding inside the container
echo 1 > /proc/sys/net/ipv4/ip_forward
# we support exposing port 5900 on the container but leave
# it up to the operator on whether to expose this - they can
# specify NO_VNC as an environment variable to disable this
# functionality
if [ -z $NO_VNC ]; then
iptables -t nat -A PREROUTING -p tcp \! --dport 5900 -d $HOST_IP -j DNAT --to-destination $VM_IP
iptables -t nat -A POSTROUTING -s $VM_IP -j SNAT --to-source $HOST_IP
else
iptables -t nat -A PREROUTING -d $HOST_IP -j DNAT --to-destination $VM_IP
iptables -t nat -A POSTROUTING -s $VM_IP -j SNAT --to-source $HOST_IP
fi
# generate VM specifics
cat > /etc/dnsmasq.conf << EOF
user=root
dhcp-range=$VM_IP,$VM_IP
dhcp-host=$NEWMAC,$HOSTNAME,$VM_IP,infinite
dhcp-option=option:router,$VM_GW
dhcp-option=option:netmask,$VM_NETMASK
dhcp-option=option:dns-server,$NAMESERVERS
dhcp-option=119,$SEARCH
EOF
if [ -z $NO_DHCP ]; then
dnsmasq
fi
brctl addbr $BRIDGE_IFACE
ip link set dev $BRIDGE_IFACE up
ip addr add $VM_GW/30 dev $BRIDGE_IFACE
# alanmeadows(NOTE) in many implementations with out of
# subnet gateways the dhcp approach does not work
# if [ -z $NO_DHCP ]; then
# ip addr add $NEWIP/$NEWCIDR dev $BRIDGE_IFACE
# fi
if [[ $? -ne 0 ]]; then
echo "Failed to bring up network bridge"
exit 4
fi
# Exec kvm as PID 1
mkdir -p /etc/qemu
echo allow $BRIDGE_IFACE > /etc/qemu/bridge.conf
}
# need to wait until network is ready
ISO=`generate_cloud_drive`
if [[ $ISO ]]; then
KVM_BLK_OPTS=$KVM_BLK_OPTS" -cdrom $ISO"
fi
setup_bridge_networking
HOST_IP=`ip addr show dev $IFACE | grep "inet $IP" | awk '{print $2}' | cut -f1 -d/`
VNC="-vnc $HOST_IP:0"
exec $LAUNCHER qemu-system-x86_64 -enable-kvm $VNC `eval echo $KVM_BLK_OPTS` `eval echo $KVM_NET_OPTS` -usbdevice tablet -nographic $KVM_ARGS

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# FIXME(cw); refactor into multiple per-function files
# FIXME(cw) consider using OSH helm-toolkit.utils.template
{{- define "template" -}}
{{- $name := index . 0 -}}
{{- $context := index . 1 -}}
{{- $last := base $context.Template.Name }}
{{- $wtf := $context.Template.Name | replace $last $name -}}
{{ include $wtf $context }}
{{- end -}}
---
apiVersion: v1
kind: ConfigMap
metadata:
name: cloudinit
data:
metadata: |
{ "uuid": "example-01-vm.mydomain.com" }
userdata: |
#cloud-config
fqdn: example-01-vm.mydomain.com
users:
- name: root
ssh-authorized-keys:
- {{ .Values.auth.ssh_key }}
ssh_pwauth: True
runcmd:
- [ apt-get, update ]
- [ apt-get, install, -y, --force-yes, apache2 ]
---
apiVersion: v1
kind: ConfigMap
metadata:
name: configmap-startvm
data:
startvm: |
#!/bin/bash
#
# start of startvm
{{ tuple "bin/_startvm.txt" . | include "template" | indent 4 }}
# end of startvm
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: example-01-vm
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: {{ .Values.volume.size }}
{{ if not .Values.volume.class_name }}
storageClassName: {{ .Values.volume.class_name }}
{{ end }}
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: berth
spec:
replicas: 1
template:
metadata:
labels:
app: berth
annotations:
pod.beta.kubernetes.io/hostname: example-01-vm
spec:
nodeSelector:
{{ .Values.labels.node_selector_key }}: {{ .Values.labels.node_selector_value }}
hostNetwork: false
hostPID: false
securityContext:
runAsUser: 0
containers:
- name: example-01-vm
imagePullPolicy: IfNotPresent
image: {{ .Values.images.entrypoint }}
env:
- name: IMG_SOURCE
value: http://stupidest.org/vm/ubuntu-14.04-amd64.img
- name: IMG_TARGET
value: ubuntu-14.04-amd64.img
securityContext:
privileged: true
command:
- /usr/local/bin/startvm
ports:
- containerPort: {{ .Values.network.port }}
- containerPort: {{ .Values.network.vnc }}
readinessProbe:
tcpSocket:
port: {{ .Values.network.vnc }}
volumeMounts:
- name: volume-startvm
mountPath: /usr/local/bin/startvm
subPath: startvm
- name: image
mountPath: /image
- name: dev
mountPath: /dev
- name: sys
mountPath: /sys
- name: cloudinit
mountPath: /userdata
subPath: userdata
- name: cloudinit
mountPath: /metadata
subPath: metadata
volumes:
- name: volume-startvm
configMap:
name: configmap-startvm
defaultMode: 0755
- name: image
persistentVolumeClaim:
claimName: example-01-vm
- name: dev
hostPath:
path: /dev
- name: sys
hostPath:
path: /sys
- name: cloudinit
configMap:
name: cloudinit
items:
- key: userdata
path: userdata
- key: metadata
path: metadata

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auth:
ssh_key:
images:
entrypoint: quay.io/attcomdev/kvm-manager:latest
labels:
node_selector_key: openstack-control-plane
node_selector_value: enabled
volume:
class_name:
size: 25Gi
network:
port: 22
vnc: 5900