[ Kube 6 ] Running Docker Containers in Kubernetes Cluster

Hey venkat,
Thanks man, really appreciate the hard work and effort, Its like you are sitting beside me and teaching the stuff.
🙂

What is vagrant?

Crisp and Clean, to the point both install and uninstall options highly unique.

Clicks on video
Finds out that this is a "Just me and Opensource" video
Presses like
Starts actually watching the video

Hi i was following your tutorial. They are all great. I managed to configure the cluster by manually following your instructions. Automatic vagrant didn't work for me as i had to do some tweaks in the instructions. Right now i am getting following error.

[email protected]:~/kubernetes-manual/vagrant-provisioning$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
kmaster Ready master 14h v1.18.5
kworker1 Ready <none> 14h v1.18.5
kworker2 Ready <none> 13h v1.18.5

kubectl run nginx — image nginx
"NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pod/nginx 1/1 Running 0 54s 192.168.77.133 kworker2 <none> <none>

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 14h <none>

kubectl port-forward nginx 8080:80
error: error upgrading connection: unable to upgrade connection: pod does not exist"

I am learning kubernetes so sorry for simple questions, but i think IP of pod should be like 10. something right. Also when i don't see any deployment when i run image just pod and there is no random string with pod name like you have in your current video. Any idea what i might be doing wrong here.

Hello Venkat
Happy New year:)

can you pls pls help me where to start i'm using the GCK and aws ec2 servers to create kubernetes cluster. however your using different VMs, please share where to start (videos link)for VM creation (terminals)

instead of working with images already there, could you show k8s run but from docker hub thanks

kubectl cluster-info and get nodes work from my controlling machine, but only if I am sudo su. How to use without root?

Hi Venkat,
I've a question regarding how to set up different different pod networks, as I can see that you've used two different range for two worker nodes, If you could tell me how you did that will be great help for me.
Thanks in Advance 🙂

Hi the tutorial is cool but I have one query that is I have created one master and two workers cluster creation is successful and I have deploy the Prometheus but coming to UI expose the service is cluster IP I change it to loadbalencer it's not working and I have used port forward also not working it's shows like sevice not found

Hello Venkat, Thanks for Videos on kubernetes. I need to to access nginx 80 port on NodePort 80 but it is showing that it was having some range. can you please explain how to change to nodePort to 80 ?

Thank you for making these videos.

Thanks for the awesome tutorial ,Just one doubt i excute same command as you did but it didnot create any deployment or replicaset,Just wondering why ?

[[email protected] ~]$ kubectl get nodes

NAME STATUS ROLES AGE VERSION

kmaster.example.com Ready master 32h v1.18.2

kworker1.example.com Ready <none> 32h v1.18.2

kworker2.example.com NotReady <none> 32h v1.18.2

[[email protected] ~]$ watch kubectl get all -o wide

Every 2.0s: kubectl get all -o wide Mon May 11 06:35:18 2020

NAME READY STATUS RESTARTS AGE IP NODE

NOMINATED NODE READINESS GATES

pod/myshell 1/1 Running 1 7m9s 192.168.33.193 kworker1.example

.com <none> <none>

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTO

R

service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 32h <none>

Hi, I want ask you that is it possible to run multiple container in same pod with same image like nginx. i am getting errors

Hi Venkat, Thanks for the video…..service functionality works seamlessly….but one question in the browser i have to type in node1IP and NodePort which works well but when i type in kworker1:NodePort it does not work…Checked the config in /etc/hosts of master and worker nodes and everything is in place….can you let me know the reason of the same…

thank you from bali

Thanks a lot. It works fine. I have been able to run nginx using kind

Hi sir while creating ngnix container
getting error
kubectl run ngnix –image ngnix

pod/ngnix 0/1 ImagePullBackOff 0 4m3s 192.168.136.67 kworker2.example.com <none>

one>

Hi sir
getting error while deleting pod

PS C:UsershpDownloadskubernetes-masterkubernetes-mastervagrant-provisioning> kubectl delete deploy myshell

Error from server (NotFound): deployments.apps "myshell" not found

PS C:UsershpDownloadskubernetes-masterkubernetes-mastervagrant-provisioning> kubectl get all -o wide

NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS G

S

pod/myshell 1/1 Running 0 14m 192.168.33.193 kworker1.example.com <none> <none>

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR

service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 25h <none>

PS C:UsershpDownloadskubernetes-masterkubernetes-mastervagrant-provisioning> kubectl delete deploy myshell

Error from server (NotFound): deployments.apps "myshell" not found

PS C:UsershpDownloadskubernetes-masterkubernetes-mastervagrant-provisioning>

Bye the way the tutorial was amazing

Anything you have showed in this video will be run as same on Ubuntu?? Or not

Thanks so much for this tutorial.

Hi Venkat, I am total new to vagrant. After watching your fantastic video thought to ask you if you could tell me on how can I run same setup with hyperv. I tried to use this command – vagrant up –provider=hyperv and also changed your script from virtualbox to hyperv
When I run the setup, I get below log lines. I think, in hyperv it is not able to create private network from vagrant somehow. But would like to know any workaround. Thanks in advance!
kmaster: [TASK 3] Deploy Calico network

kmaster: Unable to connect to the server: dial tcp 172.42.42.100:6443: i/o timeout

kmaster: [TASK 4] Generate and save cluster join command to /joincluster.sh

kmaster: W0217 05:04:27.716658 13007 validation.go:28] Cannot validate kube-proxy config – no validator is available

kmaster: W0217 05:04:27.716747 13007 validation.go:28] Cannot validate kubelet config – no validator is available

Hello, thanks for making these videos. They are really helpful!
I just started learning K8s few weeks ago.
I ran into a different result when trying to delete the deployment.
I followed your instructions… all the way from your first K8s video.

Here's what I got:
$ kubectl run myshell it –image busybox – sh
Error from server (AlreadyExists): replicationcontrollers "myshell" already exists
$ kubectl delete deploy myshell
Error from server (NotFound): the server could not find the requested resource
$ kubectl get deploy
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
calico-kube-controllers 1 1 1 1 19d
coredns 2 2 2 2 19d

It was also weird how I was able to delete the docker images and containers on worker1 but not on worker2. The pods kept coming back on worker2. So then I went back to the actual error message and found out about some commands I used to solve my problem.

$ kubectl get rc
NAME DESIRED CURRENT READY AGE
myshell 1 1 1 3d
nginx 1 1 1 3d
$ kubectl delete rc myshell
replicationcontroller "myshell" deleted
$ kubectl delete rc nginx
replicationcontroller "nginx" deleted
'$ kubectl get rc
No resources found.

After that, I was able to permanently delete the containers and images on worker2.
Would you know why I got that error message as opposed to what you got?
Thanks again.

I have a silly question

What is the difference between "kubectl apply -f file.yaml" and “kubectl create -f file" ?

I am running a cluster on different vms on different hosts. When I do the port forwarding and try to access the nginx server, it only works on that same vm.
example: on knode1: curl -XGET 127.0.0.1:8081 works,
but if I do knode2: curl -XGET 10.100.11.152:8081 I get connection refused

Hi Sir, your terminal so cool, what OS your laptop? And do you have tutorial for custom terminal.. thanks🙏🏻

Hi, great videos first. i have a doubt,..while doing port forwarding for nginx container, you provided 8080 for host machine. is it virtual machine port or the physical base machine port (where you are running virtual machines)? or both or same? or we are skipping virtual machine, as we are interacting to the kubernetes from the physical base machine. ?

Hii Venkat , We love your all videos regarding to kubernetes.
Im installed minikube on AWS EC2 machine when im trying to open minikube dashboard on my browser it is not opening.

Thanks For the wonderful series.. I have a question I have setup the cluster on windows by vagrant up video. Now 3 machines I can see in Oracle virtualBox. Now when I run the docker images, it shows docker not found.. Now Can you help me as I have don't any Unix/Linux(only window machine I have) machine But I have oracle virtual box with linux machine, so How can I create three node cluster with this(unix on virtualbox) machine.

Great videos!

you write too fastly…I did not understad anything

thanks creating the videos, simple and very informative.

Perfect!! Thank you so much guy 🙂

You should describe more what commands are doing – why NodePort why kubectl -rm etc. other than that nice vid

Thanks for your videos.
Iam not able to copy ~/.kube folder to host machine

Iam getting below error. Please help me resolve this issue.
$ scp root@kmaster.example.com:/etc/kubernetes/admin.conf ~/.kube/config

ssh: Could not resolve hostname kmaster.example.com: Name or service not known

Thank you for you videos.
I did like you, but I get:
The connection to the server localhost:8080 was refused – did you specify the right host or port?

the content straight forward meant for initial user who want to learn kubernetes, Thanks Buddy.

How can we pull images from custom Nexus registry to kubernetes cluster. What all config fileswe have to edit

Hi There, Just a question may be a stupid one , is it possible , if we can manage already running docker container using kubernetes.