This repo contains Kubernetes demo with modified guestbook example for Kubernetes cluster setup without skyDNS addon installed. It relays on environment variables, that's way it is important to deploy all components in proper order according to this documentation.
This demo requires full OpenStack installation with Magnum component, it can be done for example with SUSE OpenStack Cloud 7. For proper demo it is required to prepare at least 3 Nova Computes with kvm as hypervisor.
Download and upload Magnum SLES based image.
Link to the image http://download.suse.de/ibs/Devel:/Docker:/Images:/SLE12SP2-JeOS-k8s-magnum/images/sles-openstack-magnum-kubernetes.x86_64.qcow2
Source credentials
source .openrc
Upload image to Glance service
glance image-create --name sles-openstack-magnum-kubernetes \
--visibility public \
--disk-format qcow2 \
--os-distro opensuse \
--container-format bare \
--file ./sles-openstack-magnum-kubernetes.x86_64.qcow2
Import SSH key from controller node to use with the cluster template
nova keypair-add --pub-key ~/.ssh/id_rsa.pub default
Create Magnum flavor
nova flavor-create --is-public true m1.magnum 9 1024 10 1
Create cluster template
magnum cluster-template-create --name k8s_template \
--image-id sles-openstack-magnum-kubernetes \
--keypair-id default \
--external-network-id floating \
--dns-nameserver 8.8.8.8 \
--flavor-id m1.magnum \
--master-flavor-id m1.magnum \
--docker-volume-size 5 \
--network-driver flannel \
--coe kubernetes \
--floating-ip-enabled \
--tls-disabled
Create a cluster with one kube-master node and one kube-minion node
magnum cluster-create --name k8s_cluster --cluster-template k8s_template --master-count 1 --node-count 2
Clone guestbook example from this repository on node with docker installed and credentials for Kubernetes cluster deplyed by Magnum
git clone https://github.com/mjura/kubernetes-demo
And go to the example
cd ~/kubernetes-demo/examples/guestbook
Check if Kubernetes cluster is healthy and you have right endpoints crendtials
kubectl cluster-info
Deploy redis-master replication controller and service
kubectl create -f redis-master-controller.yaml
kubectl create -f redis-master-service.yaml
Check status for replication controllers, pods and service
kubectl get rc,pods,service
Deploy redis-slave replication controller and service
kubectl create -f redis-slave-controller.yaml
kubectl create -f redis-slave-service.yaml
Check status for replication controllers, pods and service
kubectl get rc,pods,service
When redis-slave pods will be ready, auto-scale it and add one more replica
kubectl scale --replicas=2 rc/redis-slave
Check logs from redis-slave to be sure that they are replicating database from redis-master
kubectl logs <redis-slave-PODID>
Deploy frontend web application
kubectl create -f frontend-controller.yaml
kubectl create -f frontend-service.yaml
You should get service port (tcp:3XXXX) as output to configure Neutron LoadBalancer. Create Neutron LoadBalancer new pool named guestbook, add VIP and Floating IP, as members of this pool pick up kube-mionions
Access application using Floating IP
Go to container application template
cd ~/kubernetes/examples/guestbook/php-redis/
Edit index.html file and uncomment line with image src
<!-- <img src="suse-logo.png" alt="SUSE Logo"> -->
to
<img src="suse-logo.png" alt="SUSE Logo">
Build new docker image and push it to docker-registry service
docker build -t docker.io/mjura/guestbook:v2 .
docker push docker.io/mjura/guestbook:v2
Deploy new version of application using rolling update feature from Kubernetes
kubectl rolling-update frontend --image=docker.io/mjura/guestbook:v2
After this will be done refresh webrowser with link to application