Kubernetes ConfigMap and Secret as Kubernetes Volumes | Demo
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- เผยแพร่เมื่อ 31 พ.ค. 2024
- Demo of using ConfigMap and Secret as Kubernetes Volumes | Kubernetes ConfigMap | Kubernetes Secrets | Kubernetes Volumes
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ConfigMap and Secret components are usually used for creating individual values, which are passed as environment variables in the pod configuration.
But ConfigMap and Secret are also volume types, which people don't realize in the beginning. Using them as volumes is actually a common requirement, e.g. think of applications that take configuration files as parameter on startup. Like prometheus, elastic search or your own java application taking a properties file or certificate file. The question is how to pass these config files to Kubernetes Pods?
In this video I show you how to create these configMap and secret volumes and how to use them in pods. I give you some real-life use cases and show you the syntax of using volumes in a pod configuration.
► Reference to YAML Configs: gitlab.com/nanuchi/kubernetes...
► Kubernetes Volumes Explained: • Kubernetes Volumes exp...
▬▬▬▬▬▬ T I M E S T A M P S
0:00 - Intro
0:13 - Configuration Files usages in pods
1:13 - ConfigMap and Secret creating individual values (key-value pairs) for env variables
2:40 - ConfigMap and Secret creating files for mounting them into the pod
14:44 - Summary
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► Reference to YAML Configs: gitlab.com/nanuchi/kubernetes-tutorial-series-youtube/-/tree/master/configmap-and-secret-volumes
0:13 - Configuration Files usages in pods
1:13 - ConfigMap and Secret creating individual values (key-value pairs) for env variables
2:40 - ConfigMap and Secret creating files for mounting them into the pod
14:44 - Summary
👉🏼 For any questions/issues/feedback, please leave me a comment and I will get back to you as soon as possible.
Please don't forget to subscribe and give me a thumbs up if you liked my video 😊🙏
what will happen if we delete file from volume from container ,will it be deleted from pod too ?
Nana the life saver of kubernetes developers
I'm glad that you think so Raja 😅 Thanks for the support. Please don't forget to subscribe and share. 🙂
I signed up for java but they are also giving me work related to devops. This video is a life saver.😅
Thank you Naina! what an amazing tutorial and you got the greatest acumen to explain complex things. Kubernetes is no monster to me now after watching your videos. Thanks for being magnanimous and sharing your videos which are worth gold. God bless you!
No doubt, when we talk about kubernetes your channel is the best
after watching lots of devops toturials, everything is becoming a lot more easier. thanks for our great youtube content creators like Nana and others...
I have been watching some of the k8s videos. The animated diagrams and the way each sucbject is approached makes complex topics look simple. Tha's a rare talent right there.
Wow, thank you for this comment! Glad you think so. If you want to support me, please share my video to people who are interested in learning k8s or devops in general. Would be very helpful :)
best channel to learn K8s. Explanation is simple and can easily be remembered. Brilliant!!
Thankful for the opportunity to help Pallav. Your compliment is much appreciated. 😇
I love this video. I learn from a detailed explanation. Thank you so much!
It became so much clear after watching your video. Great explanation! Thanks for sharing.
Best video on configmaps on TH-cam, thx!
Putting a like before even watching., 👍👍👍
I have always struggled to get a clear understanding of the use cases of configMap and secret but thanks to you for making it so simple to understand and remember.
You're welcome Aditya. Wishing you all the best in your career. Stay safe. 😇
this video was lifesaver for me thanks for these quality content
Thank you so much for this video. I constantly come back to this and refer a few things.
Thank you so much for this vedio, from some days i m struggling on this topic and today your vedio appear like miracle to me♥️♥️♥️♥️♥️♥️
You're welcome, really glad to hear that they helped you :)
Thanks nana, you r genius, beauty with brain, such an extraordinary person. Thanks a lot. Grat work keep it up ❤❤
perfectly explained.. really helped me all doubts ... youuuuu rocks !!!!
thank you
What a wonderful explanation - Must know concepts explained in very simple way. Well done :)
Thankyou so very much ankita, this video lecture was like a walk on snow you made it just so easy. Keep it up!!
Thank you for the encouragement Jaspal. Just the little things that I need to fuel my passion. Much appreciated. 😇
I play her vids as comforting BGM while I code other stuff :)
Thanks Nana for this tutorial. I find it very useful and Appreciate your good job.
High quality education videos! Thank you for your great work ^^
Great video Nana, tks so much for share this knoledge with us !!
Thank you, the best explanation of this subject i found.
WoWwwww thank you so much. You are simply great. I asked the content and you have recorded.😍😍😍😍😍
Thanks Murali :)
You are an amazing presenter. Good work.
Grateful for the appreciation Saravana. 😅
This was amazing demonstration of config map.
You are great at explaining concepts. Keep it up!!
Thank you Sandro :)
Thanks Nana for the explanation and implementation
Congratulations🎉
For 1 M
I always learn something new thanks to you 🙏
Very helpful, thanks Nana!
La mejor explicación! te amo!
simplicity ! as usual awesome.
Waiting for your other videos on different volume types.
Its nice lecture am the fan of u, the way u r taking in to the topics keep on
Thank you Deepak, glad you like my teaching style :)
Thanks Nana. that was a great explanation
Hi Nana, thank you for your videos they're incredible. I was wondering if you had a demo video for local persistent volumes?
Great, good to start with basics
great and simple explanation
you are awesome Nana!
Very good and precise tutorial!
Thank you so much :)
excellent explanation!
Very well explained
Great vedieo. Learned a lot from you. Thanks Nana. It looks like you have used a wrong screenshot at 16:13. while you used the top left with kind/configmap, you use kind/secret for using env variable case.
awesome explaination!!
Thanks a lot! I love your videos!
Happy to see that you watch all my videos :) Thanks for that!
Great video, really helpful!
Thanks Ian. 😇
nice walk through of Vol and Secret. Looking forward to learn about local volume as i got 'node affinity conflict' error on mac using docker-desktop
Thanks, video will come soon!
@@TechWorldwithNana ,
Many thanks for the excellent videos. I found your explanations to be very useful.
Have you finished/posted detailed videos for local and remote volumes, explaining the Yaml files? If so, can you please share the link?
Wonderful Video Nana ❤❤
I love kubernetes. Just recently been doing some videos on it on my channel
Thanks for your beautiful explaination.please make and upload videos on statefulsets.
Hi Mohammed! Thank you, yes I will make a separate video about statefulSets. Turn on the bell to get notified and don't miss new videos :)
Excellent!!!!
you are the best!
Thanks .it is very helpful
You're welcome Jayashree.😇
Great!!!
awesome video!
super explanation
Thanks 🙂
Thanks for the great explanation!
Is there a way to mount a single file, like in docker or does it work only for directories
thank you! This helped me solve a problem with keycloak and realm-export.json. Does the overwrite create the file if the file doesn't exist, or does it simply overwrite what is already there?
Thanks a lot!
HI Nana,
Excellent Video & Nice the way of presentation. Thanks for your time for this.
I just have one query on this.
in POD definition file under spec: volumes, is it mean volume will create? and the files mosquite-config & secret-file will store on base machine?
clean tqsm
thank you
amazing
Thanks nana🥳
You're welcome :)
Wonderful video! At 7:34 you show the format of the config-file.yaml file. When I do the same, I get separate files; one for each key versus all keys and values being stored in mosquitto.conf What could I be doing wrong? Have K8 changed since this video? Thanks.
Thank you so much, I learned a lot through these devops videos also could you help me understand if we can pass Configmap metadata name as variable if it’s dynamic in deployment pods.. along with keys.
Very good explanation. Please suggest if I have store these secret and configmap files in a separate secure location instead of keeping them with deployment files then how to put it in the deployment file..
Hey it’s great video 😀
Thanks, glad you like it :)
Hi Nana,
Is there a way to append contents to the .conf file instead of overwriting the whole file?
Thanks Nana for your incredible video,
I’ve a small question please
How can I create that data: secret.file and how it’s equal to the secret data: params I don’t know how make them equal each other ?
Hello Nana,
Great course ,Is it possible to mount kubeconfig file this way ,so that the PODs can access them .I have a use case with that
Awesome. It's an easy to understand concept. Do you have full courses in udemy?
Few questions:
1. Can you delete a configmap then deploy a new one while a pod is still running or using it?
2. Can you change something in a configmap while it is being used by a running pod? will the pod detect the changes in the configmap?
Hi Nana, will spring boot be able to pick up application.properties file from /config location. Thanks for video
Thanks for this. Is there a way to make them (configmap and secret) persistent?
What is best practice to separate development (local development) and production (k8s) ?
I am applying the same mosquitto-config-components.yaml from your repo. I can see the Secret generated for mosquitto to use . But when i logged into the mosquitto pod, I do see /mosquitto/config but not the /mosquitto/secret directory. Any debugging step that can help. No errors on kubectl apply or kubectl pod
Hi nana, which software are you using to create these animations?
Hi Nana, is it possible to create secret specification for creating secret from file, not from command line with --from-file attribute?
Thank you so much for this video, can you also explain about ConfigMap generator to configure secrets & Certificates from json file
Hi Bhavyasree! You're welcome. Hopefully we can add that to the pipeline. Appreciate the support. 🙂
Awesome :-)
Thank you Vipin. That makes you awesome as well. 🙂
I've gone through a lot of videos of yours pertaining to kubernetes and they've been really good and easy to understand. But i have one question here. If the requirement of a config file is known well before hand, is it better to bake it in the docker image while creating or is use of configmaps recommended ?
ConfigMaps may change often, if you change the endpoint names, add new ones or change some config details. So by having it outside of docker image, you don't have to rebuild the image. Also you can pass the config map or secret to diff applications, if they both need the same service.
@@TechWorldwithNana Thank You!
Great explanation! One question: can we change the value of configmap mountes as a volume? I mean if i add a line into the file mosquito.file from one pod, will i be able to see it from another pod ? Thanks
Thanks Sabri. No, you can't change configMap value from the pod.
excellent example!!! it's possible use this volumeMount to declare envs, using cat /secret/secret.file?
Hi Nana, How to use configure Centralised configuration by using configmap in the kustomization.
Can you please explain where do the symlinks that the newly sourced files via the configmap and the secret point to?
Grt tutorials Nana. Could you explain difference between secret and config map, except the data is encoded in secret as base64.... anyone can get the secret using 'kubectl get secret "secretname" -o yaml' and decode from base64, Is there any other key difference that iam missing?
Awesome orchestration!! I wanna marry you😁
😅
Guys please show some love on the comments, remember all this Kubernetes training is well made and besides it is free
Hi, I want to have a fixed number of pods in K8 and each pod will have slightly different configuration, I want this because I want to divide the work among each pods, is there a way to do this ? Thanks in advance.
Hi Nana, I just wanted to ask if do you have module for AWS parameter store for eks??
What if my pod wants to dynamically refresh the secret (password, if it changes) from configmap volume without restarting the pod?
When you write kubectl exex and then pass the --/bin/sh what is that? It is the entry point for the container meaning it will start the shell ?
Hi Nana, suppose i am already having a json file in my container, I just need to replace a certain value in that file. What will i do in that scenario?
Thanks Nana did you create a persistent volume and pvc for this example I know in real world if the container gets restarted we lose all data ?
No. That's the difference with configMap and secret. You don't need PV and PVC with them. They persist independent of the pod, so when you restart the pod, it will get remounted every time, so you don't lose the data. you can also use the same configMap and secret in multiple pods. For example if you have 5 pods that all need a client certificate, you create one secret and mount it in every pod. Does it clarify your point?
@@TechWorldwithNana Absolutely 👌
Hi Nana, I don't understand the point of secrets if I have access to secret manifest and can decode it?
Hey. Hope you're doing good. I have another question. I have a configuration file baked into the docker image in which i would want to add just one line additionally which would vary depending on my application without over writing it the entire content of it. Is that possible ?
You could probably use environment variables.