[ Kube 15 ] Using ConfigMaps in Kubernetes Cluster

[@arunreddy1436]

Nice videos on k8s venkat gaaru, will recommend my friends as well to go through

[@justmeandopensource]

Hi Arun, thanks for watching this video. Also appreciate your effort in sharing this with your friends. Cheers.

[@koolkravi]

Nice video and explanation Venkat. I am going through all your videos one by one. Setting up kubeadm kubernetes cluster quicky with vagrant provisioning is really good to set up cluster whenever I need to do the practice or test any new feature. I believe creating a multinode cluster using kubeadm is also used in a production environment

[@justmeandopensource]

Hi Ravi, thanks for watching. I guess you meant multi-master cluster. Yes any production cluster needs to be Highly Available with multi-master. Usually anyone would go for a managed kubernetes service like EKS, GKE or AKS where you don't have to worry about managing the controller nodes. Or if you want more control over your cluster, using KOPS or Kubespray would be beneficial as it provides full automation to managing the cluster. There are also other options which I haven't explored.

[@koolkravi]

@@justmeandopensource Thanks for the reply. What is your suggestion on using the tool on setting up a multi-master cluster on-premise? Due to some reason if client does not want to use any cloud vendor.

[@justmeandopensource]

@@koolkravi Kubespray would be a good starting point. You can also consider Rancher.

[@zhang20244]

Very good and easy understand instruction, Thank you

[@justmeandopensource]

Hi Frank, thanks for watching.

[@sureshkaranam4280]

awesome brother

[@justmeandopensource]

Hi Eswar, thanks for watching.

[@sureshkaranam4280]

@@justmeandopensource Could you please do more videos on Spinnaker

[@romantsyupryk3009]

Thanks so much for this tutorial.

[@justmeandopensource]

Hi Roman, thanks for watching. Cheers.

[@wisdom514]

Hi Venkat, can you please post a video for k8s master with HA(2 Master node instead of one) . Thank you for all the work which you are doing.

[@justmeandopensource]

HI Kapil, I have already played with HA multi master cluster. Whenever I get some time I will make a video of it. Thanks, Venkat

[@rajithr9065]

Can do a video of configmap created during a application is installed...the process how it works with a application

[@_siva_polisetty]

Hi, could you please make video on statefullset with replication of statefull applications and how to use

[@justmeandopensource]

Hi Siva, statefulset is in my list. You will be notified when I upload that video. Thanks for following my channel.

[@manikandans8808]

Hi venkat, when I try to use .env file to deploy as configmaps in Laravel apps. It removes all the file which is present in /var/www/html. Suggest me some ideas for this.

[@justmeandopensource]

Hi Mani, thanks for watching. I can't troubleshoot without details to the manifest or how exactly you are deploying. Chances are that you are mounting the configmaps on /var/www/html.

[@trueprakash4u]

Hi manikandan, did you get soluction ?

[@manikandans8808]

@@trueprakash4u no bro... instead I used a hacky method for sybolink that .env to /var/www/html. Do you have any idea how I can solve this?

[@ramakrishna8692]

Hi Venkat, Thanks for the detailed explanation. Could you tell me, is the env variables are updated dynamically in configMaps without recreating the POD ? If no why ?. I've tried but failed.

[@justmeandopensource]

hi Rama Krishna, thanks for watching. I don't think the env variable in the pod will be updated dynaically. The pod needs to be restarted to take effect.

[@Praveen-xx7iy]

Hi Venkat I am deploying applications with helm charts to kubernetes cluster. Configmaps also placed in helm templates. But whenever I want to modify any value in configmaps (example : database server) do I need to redeploy again or any way to take the changed value s in configmaps ??

[@justmeandopensource]

Hi Praveen, is this your custom helm chart or one from the stable repo? If its a stable helm repo, I can test it. What sort of configmap are you using? Env variables or volume mounts? I would have thought that when you update the configmap (kubectl edit configmap), it will update and you don't have to redeploy. Cheers.

[@Praveen-xx7iy]

@@justmeandopensource hi Venkat it's custom charts and created with --from-env-file option. I tried with kubectl edit cm but the values which I modified was not reflected in pod.

[@justmeandopensource]

Hmm. In that case, just delete the pod(s), the new ones will have updated config. You don't have to deploy it using helm. Cheers.

[@Praveen-xx7iy]

@@justmeandopensource deleting of pods will get downtime. Is it possible without downtime ?

[@justmeandopensource]

@@Praveen-xx7iy Are you running just replica? You can scale it to have more replicas and you can delete pods one by one. Or update your helm charts and rollout the update. In any case, if you have just one pod, then I don't think it can be done without a breif downtime.

[@smartaquarius2021]

I need to host a pre compiled tensorflow serving docker image in kubernetes which I cannot edit at all. If I simply host it then it will be accessible as rest api to everyone. Is there anyway to put some authentication wall in the middle. For eg. Client must send a token in the header to post and get the data. I thought to check if certificates would help but in my case I have more than 500 users and certificate maintenance would be difficult. In addition, my certificate expires every 1 year hence, changing on all the machines shall be a problem again. Please suggest.

[@sarfarazshaikh]

Hi Sir Great Video, In this video you are mounting the configmaps as volume, But can you please make a video of defining configmap directly inside deployment.yaml file. Which one will be better to use?

[@justmeandopensource]

Hi Sarfaraz, Thanks for watching this video. I should have included that in my video but forgot. Anyways, you can find an example in the below article. I just did a google search and found this article. All credit goes to article owner. Thanks.

[@sagayarajdavid6628]

@@justmeandopensource Can you post the article link, I guess you missed it

[@justmeandopensource]

@@sagayarajdavid6628 Thanks for watching this video. Yes, I indeed forgot to paste the link. Here it is. unofficial-kubernetes.readthedocs.io/en/latest/tasks/configure-pod-container/configmap/ Thanks.

[@HarshaVardhan-jf9sd]

Executing kubectl commands is fine,but in order to really automate this entire process,can u do a video on using some IAAC framework like ansible or terraform?

[@justmeandopensource]

Hi Harsha, Thanks for watching this video. I have been doing IAC using terrraform for a while. I wanted to cover other topics before diving into Terraform. I am not sure what exactly you are looking for in automation. You can provision Kubernetes cluster using Terraform on public cloud provider. Also you can manage application deployments in Kubernetes using Terraform. Check the below link. www.terraform.io/docs/providers/kubernetes/index.html I will soon start videos on Terraform. Planning to include that on my Learn AWS series. Thanks.

[@HarshaVardhan-jf9sd]

@@justmeandopensource how about ansible for on premise orchestration and not on any cloud provider as such..can terraform be used on premise also..if so which is better?

[@justmeandopensource]

From StackOverflow, Terraform operates by calling into the APIs of various service providers and systems. Thus in principle Terraform can manage anything that has an API, and in practice it has existing support for a few different on-premises-capable systems, including: OpenStack VMWare vSphere CloudStack If the compute resources in your existing datacenter infrastructure are already managed with one of these systems, or if you are willing to install them, then Terraform can be used to manage at least parts of these systems. Thanks

[@loinguyentri5859]

what is the software you are using to monitor memory, system. processor,.... ??

[@justmeandopensource]

Hi, thanks for watching. Thats conky process which you can configure to monitor anything actually. But I am not using this environment anymore. Also I don't have that conky configuration right now. Hopefully you can google for some sample conky configuration (conkyrc). Cheers.

[@naveverm]

I really like you shell and auto completion, Can you give me any pointers how can I achieve the same. Thanks in advance...

[@justmeandopensource]

Hi Naveen, thanks for watching. Its a combination of zsh, oh-my-zsh, zsh-autosuggestions and tmux. I have done a video on it. kzbin.info/www/bejne/qaCkqIinZ8iEfrM Cheers.

[@naveverm]

@@justmeandopensource Thanks a lot will give it a try. Thanks you

[@justmeandopensource]

@@naveverm You are welcome. Cheers.

[@JackLee-i3b]

I have a question.There is a replicaset. 3 pods. Each one has a same config-key, but different value.How do I write the yaml file.

[@justmeandopensource]

Hi, thanks for watching. Pods in a replicaset are meant to be identical in terms of configurations. So you define the pod configurations in the manifest and set the number of replicas to 3 which means they all have to be identical.

[@JackLee-i3b]

Thank you for answering! I will try it.And thanks for your work of videos.

[@justmeandopensource]

@@JackLee-i3b You are welcome.

[@AgusSetiawan-zb8ox]

what's kind of OS are you USE ? it's look like simple

[@justmeandopensource]

Hi Agoest, thanks for watching. I use Manjaro with I3 tiling window manager. Done few videos on it. If you are interested, here they are, kzbin.info/aero/PL34sAs7_26wOgqJAHey16337dkqahonNX Thanks.

[@budget_backpackers]

Hey I am trying to get PODs name using configmap (will use this configmap in my deployment with 3 replicas). Tried using podname=$HOSTNAME inside my configmap. But its not working.

[@jimmyxu4355]

good material, terrible instruction

[@justmeandopensource]

Hi Jimmy, thanks for watching. Sorry that you found it terrible.