These are instructions for setting up the demo that originally ran at the Denver Open Infrastructure Summit in April of 2019. We'll set up a working kubernetes cloud on top of microstack, demonstrating how to deploy a workload on top of our cloud.
This Demo must be run on a machine with the following specs:
First, you'll need to install some dependencies on your machine.
Obviously, we'll need to install microstack. We'll also install the juju and kubectl snaps, which will give us tools to deploy and manage kubernetes, respectively.
sudo snap install --classic --beta microstack sudo snap install --classic juju sudo snap install --classic kubectl
To make sure that you can use the snaps we've installed, add /snap/bin to your path
sudo vim /etc/environment
Add /snap/bin to the beginning of your path, and save the file, then:
Openstack runs a lot of processes, and opens a lot of network connections. You may want to tweak your system networking and virtualization defaults to accommodate this:
echo fs.inotify.max_queued_events=1048576 | sudo tee -a /etc/sysctl.conf echo fs.inotify.max_user_instances=1048576 | sudo tee -a /etc/sysctl.conf echo fs.inotify.max_user_watches=1048576 | sudo tee -a /etc/sysctl.conf echo vm.max_map_count=262144 | sudo tee -a /etc/sysctl.conf echo vm.swappiness=1 | sudo tee -a /etc/sysctl.conf sudo sysctl -p
At this point, you have all the OpenStack bits on disk, and the services are running. But they still have to be configured to talk to each other. Plus, you need a root password and other niceties. Run the init script to set all of that up:
(Note that you may leave --auto out at present. The init script will be interactive in the very near future, however, and if you are scripting, you'll want to leave that auto in!)
By default, microstack will use Cloudflare's 184.108.40.206 as a DNS. If you're in a network restricted environment, or simply want to use a different DNS, you'll need to edit the config manually:
sudo vim /var/snap/microstack/common/etc/neutron/dhcp_agent.ini
Add the following text to
[DEFAULT] interface_driver = openvswitch dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq enable_isolated_metadata = True dnsmasq_dns_servers = <your dns>
You'll need to restart the microstack services if you've made this change:
sudo systemctl restart snap.microstack.*
Create a test instance in your cloud.
This will launch a machine using the built-in cirros image, and also do some other nice things like setting up security groups. Once the machine is setup, verify that you can ping it, then tear it down.
ping 10.20.20.<N> microstack.openstack server delete test
The cirros images is great for quickly testing out our cloud's functionality, but for this demo, we'll want to add a more full featured ubuntu image. Go ahead and download it from the cloud images repository:
mkdir images curl https://cloud-images.ubuntu.com/bionic/current/bionic-server-cloudimg-amd64.img --output images/bionic-server-cloudimg-amd64.img
Now, add the image to your cloud:
microstack.openstack image create --file images/bionic-server-cloudimg-amd64.img --public --container-format=bare --disk-format=qcow2 bionic
Take note of the image id. Add it to your shell environment as IMAGE (you'll need it later):
export IMAGE=<image id>
juju add-cloud microstack
Answer the questions as follows:
|add another region?:|
You'll need to load microstack credentials. You can temporarily drop into the microstack snap's shell environment to make this easy.
snap run --shell microstack.launch juju autoload-credentials exit
In order to function, juju needs to know how to find metadata for the images in your microstack cloud. Here's how to set that up.
mkdir simplestreams juju metadata generate-image -d ~/simplestreams -i $IMAGE -s bionic -r microstack -u http://10.20.20.1:5000/v3
(If you don't still have an
IMAGE variable in your env, you can find
your image id by running
microstack.openstack image list)
microstack.openstack flavor create juju-controller --ram 2048 --disk 20 --vcpus 1
You're ready to bootstrap juju!
juju bootstrap --debug --config network=test --config external-network=external --config use-floating-ip=true --bootstrap-series=bionic --bootstrap-constraints instance-type=juju-controller --metadata-source $HOME/simplestreams/ microstack microstack
You'll need to upload your simplestreams data to the juju controller.
tar cvzf simplestreams.tar.gz simplestreams juju switch controller juju scp simplestreams.tar.gz 0: juju ssh 0 -- tar xvzf simplestreams.tar.gz
Drop the following text into a file called
use-floating-ip: true image-metadata-url: /home/ubuntu/simplestreams/images network: test external-network: external
Now add the model:
juju add-model k8s --config model-config.yaml
Drop the following text into a file called bundle.yaml:
description: A minimal two-machine Kubernetes cluster, appropriate for development. series: bionic machines: '0': constraints: instance-type=m1.small series: bionic '1': constraints: instance-type=m1.small series: bionic '2': constraints: instance-type=m1.small series: bionic services: easyrsa: annotations: gui-x: '450' gui-y: '550' charm: cs:~containers/easyrsa num_units: 1 to: - '2' etcd: annotations: gui-x: '800' gui-y: '550' charm: cs:~containers/etcd num_units: 1 to: - '0' flannel: annotations: gui-x: '450' gui-y: '750' charm: cs:~containers/flannel kubernetes-master: annotations: gui-x: '800' gui-y: '850' charm: cs:~containers/kubernetes-master constraints: cores=2 mem=4G root-disk=16G expose: true num_units: 1 options: channel: 1.10/stable to: - '0' kubernetes-worker: annotations: gui-x: '100' gui-y: '850' charm: cs:~containers/kubernetes-worker constraints: cores=4 mem=4G root-disk=16G expose: true num_units: 1 options: channel: 1.10/stable to: - '1' relations: - - kubernetes-master:kube-api-endpoint - kubernetes-worker:kube-api-endpoint - - kubernetes-master:kube-control - kubernetes-worker:kube-control - - kubernetes-master:certificates - easyrsa:client - - kubernetes-master:etcd - etcd:db - - kubernetes-worker:certificates - easyrsa:client - - etcd:certificates - easyrsa:client - - flannel:etcd - etcd:db - - flannel:cni - kubernetes-master:cni - - flannel:cni - kubernetes-worker:cni
juju deploy bundle.yaml
Watch progress with:
watch --color 'juju status --color'
Once all the applications are green, you can proceed to using your new k8s cloud!
mkdir ~/.kube juju scp kubernetes-master/0:config ~/.kube/config export KUBECONFIG=$HOME/.kube/config
The canonical distribution of kubernetes has a microbot demo built in. To run it, do the following:
juju config kubernetes-worker ingress=true juju run-action kubernetes-worker/0 microbot replicas=2 juju show-action-output <id> # Where id is in the output of the above
The show action command should give you a url that looks something like:
Try visiting that url in a browser, or simply fetching it with wget (you can also get the url by running
kubectl get ingress):
You can inspect your running app with
kubectl get pods kubectl get services,endpoints
To clean up, run:
juju run-action kubernetes-worker/0 microbot delete=true