Kubernetes on Miro's World

History of Faith

Tue, 31 Mar 2020 11:24:48 +0800

The beginnings
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Once upon a time - actually, in late 2017-early 2018 - there was a QA/DevOps engineer named José who liked containers, Docker and worked for a company named Thinkwrap (that soon would become Pivotree) in Valencia, Spain.

José was responsible (among other things) for setting up integration and QA environments for multiple Hybris projects. Such environment, when being built in traditional way (from physical servers or VMs), normally requires quite a few pieces:

Kubectl client and server version mismatch

Sun, 19 Jan 2020 11:12:38 +0800

Accessing Rancher cluster
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I was doing update on Kubernetes cluster I had not touch in a while when I noticed weird behaviour:

the output of get command was incomplete
the -o wide option had no effect on the command output

(IP addresses are masked)

➜  .kube git:(master) ✗ kubectl --kubeconfig dropship-dev-uat get nodes
NAME                                             AGE
ip-172-xx-xx-xx.ca-central-1.compute.internal    613d
ip-172-xx-xx-xx.ca-central-1.compute.internal    628d
ip-172-xx-xx-xx.ca-central-1.compute.internal    558d

and

Rancher CLI vs kubectl

Sat, 18 Jan 2020 11:22:48 +0800

Accessing Rancher cluster
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After creation, you can access the K8s cluster running Rancher by saving the config file available from the console and using standard kubectl command

kubectl --kubeconfig ./quickstart.kubeconfig get pods --all-namespaces
NAMESPACE       NAME                                      READY   STATUS      RESTARTS   AGE
cattle-system   cattle-cluster-agent-5c98cb979f-bbhxf     1/1     Running     0          5d23h
cattle-system   cattle-node-agent-dwnxk                   1/1     Running     0          5d23h
cattle-system   kube-api-auth-d4zgq                       1/1     Running     0          5d23h
ingress-nginx   default-http-backend-67cf578fc4-grmsw     1/1     Running     0          5d23h
ingress-nginx   nginx-ingress-controller-mpnmb            1/1     Running     0          5d23h
kube-system     canal-jw85q                               2/2     Running     0          5d23h
kube-system     coredns-5c59fd465f-47q5z                  1/1     Running     0          5d23h
kube-system     coredns-autoscaler-d765c8497-sm5xf        1/1     Running     0          5d23h
kube-system     metrics-server-64f6dffb84-bp864           1/1     Running     0          5d23h
kube-system     rke-coredns-addon-deploy-job-95qnk        0/1     Completed   0          5d23h
kube-system     rke-ingress-controller-deploy-job-brv7w   0/1     Completed   0          5d23h
kube-system     rke-metrics-addon-deploy-job-tvt89        0/1     Completed   0          5d23h
kube-system     rke-network-plugin-deploy-job-7rqcr       0/1     Completed   0          5d23h

The same information (and much more) is available using rancher CLI.

Creating Kubernetes Cluster in AWS from scratch with kops

Mon, 07 May 2018 11:22:48 +0800

This describes creation of K8s cluster in AWS environment from scratch as done for microservices based eCommerce project.

Pre-requisites
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AWS account access - IAM with Admin privileges
AWS CLI installed - https://docs.aws.amazon.com/cli/latest/userguide/cli-install-macos.html
CLI credentials (secret key + api Key) - https://docs.aws.amazon.com/cli/latest/reference/iam/index.html
Kubectl and Kops local install ** see https://github.com/kubernetes/kops and https://kubernetes.io/docs/tasks/tools/install-kubectl/

Test of access
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➜  etc git:(feature/kubernetes) aws --version
aws-cli/1.11.180 Python/3.6.4 Darwin/17.5.0 botocore/1.7.38
 
➜  etc git:(feature/kubernetes) kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.1", GitCommit:"d4ab47518836c750f9949b9e0d387f20fb92260b", GitTreeState:"clean", BuildDate:"2018-04-13T22:27:55Z", GoVersion:"go1.9.5", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.3", GitCommit:"d2835416544f298c919e2ead3be3d0864b52323b", GitTreeState:"clean", BuildDate:"2018-02-07T11:55:20Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"}
 
➜  etc git:(feature/kubernetes) kops version
Version 1.9.0
 
➜  etc git:(feature/kubernetes) aws --profile twfulfill-miro iam list-users | jq '.Users[].UserName'
.. DELETED ...
"twfulfillment.prod.miro.adamy"
....

Set the environment variables
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These will be used by subsequent kops / aws commands

Kubernetes on Miro's World

History of Faith

The beginnings #

Kubectl client and server version mismatch

Accessing Rancher cluster #

Rancher CLI vs kubectl

Accessing Rancher cluster #

Creating Kubernetes Cluster in AWS from scratch with kops

Pre-requisites #

Test of access #

Set the environment variables #

The beginnings
#

Accessing Rancher cluster
#

Accessing Rancher cluster
#

Pre-requisites
#

Test of access
#

Set the environment variables
#