Kubernetes on Aws lightsail

This repo will create kubernetes cluster with some tools:

terraform The tool for provisioning infrastructure as code
ansible The tool for configuration management
kubeadm The official tool to initial kubernetes cluster
kubelet The kubelet is the primary "node agent" that runs on each node
containerd.io The container runtime
kubectl The official tool for interacting with the cluster
haproxy TCP loadbalancing layer 4 for masters
nginx Loadbalancing for workers
crictl The command-line interface tool for inspecting and debug container runtimes and applications on a Kubernetes node

Features

Cilium network

DualStack (ipv4 and ipv6)

Add to service spec section

ipFamilyPolicy: RequireDualStack
ipFamilies: # The order is important, the first one will be shown on the service list
- IPv4
- IPv6

High available cluster with haproxy loadbalancer for masters, check stats <loadbalancerIP>:9000/stats
Metrics server kubectl top pod, kubectl top node

Ingress Nginx Controller (Support DualStack)

kubectl describe svc ingress-nginx-controller -n ingress-nginx

Monitoring stack (node-exporter, prometheus)
```
node-exporter (Collect data in node and export it)
prometheus (Data source, collect data from node-exporter)
grafana (Perform data source by graph)
```
- Use master loadbalancing node to install prometheus and grafana
- Grafana UI: <mastersLoadbalancerIP>:3000/ with default user: admin and password: 123456
- Grafana configuration:
  - Add Prometheus data source url http://localhost:9090
  - Import grafana dashboard ID: 1860 (Node Exporter Full)

Get started

Automatic feature

./action.sh init Create the infrastructure and install a cluster on it
./action.sh scale up <master or worker or worker_lb> Add more node to cluster, default is worker node
./action.sh scale down <master or worker or worker_lb> Remove one node from cluster, default is worker node
./action.sh destroy Destroy the infrastructure
./action.sh refresh Keep the cluster match with the inventory

./action.sh to choose among options

Example options, it might have more features than the list below

 -> init
    refresh
    scale-down
    scale-down-worker_lb
    scale-up
    scale-up-master
    scale-up-worker_lb

Manual steps

Update terraform variables in variable.tf as your need
Initial terraform

    terraform init

Export environment variables TF_VAR_AWS_ACCESS_KEY and TF_VAR_AWS_SECRET_KEY with your aws credential
Overview the infrastructure

    terraform plan

Provision the infrastructure

    terraform apply

You can try ssh to the server by the ssh.sh tool in the working directory

    ./ssh.sh

Example output

 -> [email protected]
    [email protected]
    [email protected]
    [email protected]
    [email protected]
    [email protected]
    [email protected]
    [email protected]

Install some ansible requirements

    ansible-galaxy install -r requirements.ansible-galaxy.yml

Automatically install kubernetes cluster (all in one)

    ansible-playbook k8s.playbook.yml

Or do step by step to run playbooks in the ansible dir. Check orderd list in k8s.playbook.yml
Kubeconfig path, override in kubectl by option --kubeconfig or export KUBECONFIG environment
- In masters: ~/.kube/config or /etc/kubernetes/admin.conf
- In local: <this working dir>/kubeconfig (This file is automatically created by ansible)

For example:

    kubectl --kubeconfig kubeconfig

Combine with getting list pods

    kubectl --kubeconfig kubeconfig get pod -A

Show nodes

    kubectl get node -o wide

admin@ip-172-26-15-147:~$ kubectl get nodes -o wide
NAME               STATUS   ROLES           AGE   VERSION   INTERNAL-IP     EXTERNAL-IP   OS-IMAGE                         KERNEL-VERSION          CONTAINER-RUNTIME
ip-172-26-14-179   Ready    <none>          16m   v1.27.4   172.26.14.179   <none>        Debian GNU/Linux 11 (bullseye)   5.10.0-17-cloud-amd64   containerd://1.6.22
ip-172-26-15-147   Ready    control-plane   19m   v1.27.4   172.26.15.147   <none>        Debian GNU/Linux 11 (bullseye)   5.10.0-17-cloud-amd64   containerd://1.6.22
ip-172-26-20-106   Ready    control-plane   17m   v1.27.4   172.26.20.106   <none>        Debian GNU/Linux 11 (bullseye)   5.10.0-17-cloud-amd64   containerd://1.6.22
ip-172-26-23-216   Ready    <none>          16m   v1.27.4   172.26.23.216   <none>        Debian GNU/Linux 11 (bullseye)   5.10.0-17-cloud-amd64   containerd://1.6.22
ip-172-26-34-52    Ready    control-plane   18m   v1.27.4   172.26.34.52    <none>        Debian GNU/Linux 11 (bullseye)   5.10.0-17-cloud-amd64   containerd://1.6.22
ip-172-26-41-31    Ready    <none>          16m   v1.27.4   172.26.41.31    <none>        Debian GNU/Linux 11 (bullseye)   5.10.0-17-cloud-amd64   containerd://1.6.22

Debug pods, containers

    sudo crictl pods # list all pods
    sudo crictl ps # list all containers

Example output on masters

admin@ip-172-26-20-106:~$ sudo crictl pods
POD ID              CREATED             STATE               NAME                                       NAMESPACE           ATTEMPT             RUNTIME
bdd8ce425de84       14 minutes ago      Ready               etcd-ip-172-26-20-106                      kube-system         0                   (default)
6fcaa562f2ddd       14 minutes ago      Ready               kube-proxy-2bhxq                           kube-system         0                   (default)
de705883a9e0e       14 minutes ago      Ready               calico-node-hjp28                          kube-system         0                   (default)
4e7e8eddda845       14 minutes ago      Ready               kube-scheduler-ip-172-26-20-106            kube-system         0                   (default)
7db3bb8b8d5c6       14 minutes ago      Ready               kube-controller-manager-ip-172-26-20-106   kube-system         0                   (default)
cae651ea208d8       14 minutes ago      Ready               kube-apiserver-ip-172-26-20-106            kube-system         0                   (default)
admin@ip-172-26-20-106:~$ sudo crictl ps
CONTAINER           IMAGE               CREATED             STATE               NAME                      ATTEMPT             POD ID              POD
8a218a6da0a58       8065b798a4d67       13 minutes ago      Running             calico-node               0                   de705883a9e0e       calico-node-hjp28
f3490a85c47b9       6848d7eda0341       14 minutes ago      Running             kube-proxy                0                   6fcaa562f2ddd       kube-proxy-2bhxq
2dce4705141eb       86b6af7dd652c       14 minutes ago      Running             etcd                      0                   bdd8ce425de84       etcd-ip-172-26-20-106
64ec890777564       e7972205b6614       14 minutes ago      Running             kube-apiserver            1                   cae651ea208d8       kube-apiserver-ip-172-26-20-106
a690929230cf9       f466468864b7a       15 minutes ago      Running             kube-controller-manager   0                   7db3bb8b8d5c6       kube-controller-manager-ip-172-26-20-106
4a6d5a9debd2d       98ef2570f3cde       15 minutes ago      Running             kube-scheduler            0                   4e7e8eddda845       kube-scheduler-ip-172-26-20-106

Example output on workers

admin@ip-172-26-14-179:~$ sudo crictl pods
POD ID              CREATED             STATE               NAME                NAMESPACE           ATTEMPT             RUNTIME
ea15d537a319c       15 minutes ago      Ready               kube-proxy-p6tfm    kube-system         0                   (default)
17cc51e48a59d       15 minutes ago      Ready               calico-node-nh8sx   kube-system         0                   (default)
admin@ip-172-26-14-179:~$ sudo crictl ps
CONTAINER           IMAGE               CREATED             STATE               NAME                ATTEMPT             POD ID              POD
aeda596ff8753       8065b798a4d67       14 minutes ago      Running             calico-node         0                   17cc51e48a59d       calico-node-nh8sx
0209c14bb4cba       6848d7eda0341       15 minutes ago      Running             kube-proxy          0                   ea15d537a319c       kube-proxy-p6tfm

Name		Name	Last commit message	Last commit date
Latest commit History 95 Commits
ansible_dir		ansible_dir
shell_libs		shell_libs
.gitignore		.gitignore
README.md		README.md
action.sh		action.sh
ansible.cfg		ansible.cfg
ansible.inventory.local_file.resource.tf		ansible.inventory.local_file.resource.tf
data.tf		data.tf
instance.resource.tf		instance.resource.tf
k8s.playbook.yml		k8s.playbook.yml
key_pair.local_file.resource.tf		key_pair.local_file.resource.tf
key_pair.resource.tf		key_pair.resource.tf
locals.tf		locals.tf
main.tf		main.tf
master_lb.haproxy.cfg.local_file.resource.tf		master_lb.haproxy.cfg.local_file.resource.tf
network.resource.tf		network.resource.tf
provider.tf		provider.tf
requirements.ansible-galaxy.yml		requirements.ansible-galaxy.yml
ssh.sh.local_file.resource.tf		ssh.sh.local_file.resource.tf
ssh.sh.tftpl		ssh.sh.tftpl
variable.tf		variable.tf
worker_lb.nginx.conf.local_file.resource.tf		worker_lb.nginx.conf.local_file.resource.tf

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