fix issue 68211 modified subpath configmap mount fails when container Are Hebrew "Qoheleth" and Latin "collate" in any way related? The Problem. So your Sprint Reviews have turned into Garbage? With Helm charts we can use templates to fetch the files inside the ConfigMap or Secrets. There can be two possible scenarios to create your ConfigMap. Mapping Kubernetes ConfigMap to Read/Write folders and files Trying to copy/mount file to AWX kubernetes pod but getting error, Kubernetes mount volume on existing directory with files inside the container. Thanks for contributing an answer to Stack Overflow! Sign in It seems my config is correct but it still don't work. I have added some files to the configmap using: kubectl create configmap etc-configs --from-file=/tmp/etc-config. to stay connected and get the latest updates. However, it is supported after K8s 1.10 version . Why the difference between double and electric bass fingering? Asking for help, clarification, or responding to other answers. I want to be able to mount an unknown number of config files in /etc/configs. The problem however is it laid that volume on top of the existing directory. In my case, I had to remove subPath. Anything else we need to know? Before you begin You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster . If my articles on GoLinuxCloud has helped you, kindly consider buying me a coffee as a token of appreciation. See dshulyak/kubernetes.github.io@d58ba7b. Kubernetes configMap - only one file. In order to do so, you have to specify subPath. Instead of adding a new file, the Kubernetes mount volume will replace all the file, and it removes the existing file. Is it possible to change Arduino Nano sine wave frequency without using PWM? Have a question about this project? Kubernetes: Mount a file in your Pod using a ConfigMap Are there computable functions which can't be expressed in Lean? This means secrets can't be mounted as files in the same way you'd do a file-as-volume-mount in Docker or mount a ConfigMap item into an existing directory. If I change overwriting directory from conf.d to new nginx.d then the passing my config will be successful. Different answer using Dsolve or NDSolve to solve a PDE. When we want to add a file to a ConfigMap we use the --from-file flag with the kubectl create configmap command. Lately Ive been learning Go and this week I started a side project named kube-sherlock. I will use the scenario-1-cm in this example but you can use any other ConfigMap based on your preference. If not, unmount the subpath target. You can mount the ConfigMap as a special volume into your container. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. kubernetes mount configmap as file in existing directory Code Example Kubernetes: Mounting Secrets and ConfigMaps to multiple - Medium If you need to mount all file in a folder, you shouldn't use configmap, but a persistenceVolume and persistenceVolumeClaims: apiVersion: v1 kind: PersistentVolume metadata: name: pv-volume-jenkins spec: capacity: storage: 50Gi accessModes: - ReadWriteOnce hostPath: path . FLIP-144: Native Kubernetes HA for Flink - Apache Flink - Apache To learn more, see our tips on writing great answers. FileSystem object - You can mount configmap and each key would be created as a file with the corresponding value as a content; Environment variable - A key and value pair that you want to pass to the container dynamically; Commandline Argument - You can change the default CMD of the container . Yes! By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You signed in with another tab or window. Perform a quick search across GoLinuxCloud. Does anyone know what brick this is? How to reproduce it (as minimally and precisely as possible): dir: /home The Kubernetes subPath property prevents overwriting of existing data by mounting a single file from the volume instead of mounting the whole volume. Kubernetes doesn't allow to mount file to container. The Docker container did not start so I was manually staring it using docker run -it --entrypoint='/bin/bash' and I could not see any files from the configMap. While trying to deploy a kubernetes helm chart with configmap, service and deployment.yaml, Its observed that the properties file, my.properties isn't getting created as specified in the subPath in deployment.yaml.Infact, a directory with the same name is created. Kubernetes subPath Examples | MountPath vs subPath Explained, ## This is dummy configuration file ## If the value of the --from-file flag is a directory, kubectl will scan the directory and add each file . }, PodDisruptionBudget in Action with Examples. In this tutorial we explored Kubernetes ConfigMaps, which are maps of configuration properties that may be used in Kubernetes object definitions such as pods, replication controllers, and also to set environment variables and command arguments. Issues go stale after 90d of inactivity. This could be reproduced by several commands: # touch a b c # mount --bind a b # rm -f a # mount --bind b c mount: mount(2) failed: No such file or directory The solution is to check source of the bind mounted subpath target. Showing to police only a copy of a document with a cross on it reading "not associable with any utility or profile of any entity", How can I optimize double for loop in matrix. To create a ConfigMap from a file, use the command: kubectl create configmap [configmap_name] --from-file [path/to/file] To create a ConfigMap from multiple files, run: The keys in the config map become the file names, and . You can pass in multiple key-value pairs. All files belong to jboss:root under WEB-INF. conf { kubectl create configmap <NAME> <DATA>. Stack Overflow for Teams is moving to its own domain! name: volume-ju4m3 Reopen the issue with /reopen. There are two ways to access data via NFS and Kubernetes: Ephemeral NFS volumes can be attached to existing NFS storage. You can achieve this with the help of a ConfigMap, creating a new config.yaml with your custom values: Note: I'm using the name of the file as the key. What's the best way to share/mount one file into a pod? In this case, the mount folder will show each of the keys as a file in the mount folder and the files will have the map values as content. Follow to join The Startups +8 million monthly readers & +760K followers. Can we infer whether a given approach is visual only from the track data and the meteorological conditions? How to mount a volume with a windows container in kubernetes? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, this seems to be a valid answer for this question. How to map one single file into kubernetes pod using hostPath? Quick Fix: Mounting a ConfigMap to an Existing Volume in Kubernetes When you mount a secret to a directory (like /var/my-app in the above example), Kubernetes will mount the entire directory /var/my-app with only the contents of your secret / secretName . Send feedback to sig-testing, kubernetes/test-infra and/or fejta. : Uncomment only one, leave it on its own line: What happened: Already on GitHub? What's the best way to share/mount one file into a pod? Since my application relies on default_config.yml and since the application also looks for the database.yml in the same subdirectory, I need to mount the file from the ConfigMap as a volume without overwriting the entire /config directory.. Find centralized, trusted content and collaborate around the technologies you use most. ConfigMaps | Kubernetes I don't need folders, I'm happy with a flat structure with files direct under /etc/configs, Thanks but that part works. Pods can consume ConfigMaps as environment variables, command-line arguments, or as configuration files in a volume. GREPPER; SEARCH ; WRITEUPS; FAQ; DOCS ; INSTALL GREPPER; Log In; All Languages >> Whatever >> >> Whatever >> Kubernetes ConfigMap. Using mountPath: /etc/configs, your docker image must have /etc/config inside. Mount file to Kubernetes Pod Without Deleting the Existing File How to reproduce it (as minimally and precisely as possible): When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. I am trying to add environment specific xml files to a pod. Thanks, I was confused by the accepted answer and I thought that it's not possible to mount multiple files from a configMap into a directory. This article assumes that you already have. Cloud provider or hardware configuration**. Option 2: Create ConfigMap From Files. Father | Husband | Sr Cloud Solution Architect | Former Azure & Developer Technologies MVP | Opinions are my own. Here is my YAML file to create multi-container pod: I have added enough comments to help you understand the important of each field which is required to mount ConfigMap as file into an existing directory. pwd: PASSWORD Is there any workaround or I made a mistake in my deployment file? Mounting a Kubernetes Secret as a single file inside a Pod Once I configure the configmap, the files and subdirectories are all deleted with my configmap files and only the files that are part of the config map show up in the pod at the mountpoint. I will cover ConfigMap examples for all these scenarios, you can choose either based on your requirement: In this scenario we will use kubectl input arguments to create a configmap using an existing file. Note: serviceAccountToken is not a volume type. Stale issues rot after 30d of inactivity. Instructions for interacting with me using PR comments are available here. Using subPath also did not help. Install single-node Kubernetes Cluster (minikube), Install multi-node Kubernetes Cluster (Weave Net CNI), Install multi-node Kubernetes Cluster (Calico CNI), Install multi-node Kubernetes Cluster (Containerd), Kubernetes ReplicaSet & ReplicationController, Kubernetes Labels, Selectors & Annotations, Kubernetes Authentication & Authorization, Remove nodes from existing Kubernetes Cluster. Kubernetes Configmap can be considered and used as one of these. volumeMounts: The text was updated successfully, but these errors were encountered: currently configmap/secret volumeMount use pkg\volume\util\atomic_writer.go to create dir and files, when configmap/secret update a new dir and files is created , new link with ..data and remove the old dir . Mounting ConfigMap as single file - Cloud Alchemist If these resources are used as environment variables then runtime update is not supported. Well occasionally send you account related emails. By clicking Sign up for GitHub, you agree to our terms of service and All the files in the container under /etc/ were not deleted. Create ConfigMap. For example, to replace nginx's config with one from ConfigMap: Volumes | Kubernetes # The name of the file to be placed inside /etc, the filename used here and in mountPath should be same. Commentdocument.getElementById("comment").setAttribute( "id", "a401323eff538d42141649067528d240" );document.getElementById("gd19b63e6e").setAttribute( "id", "comment" ); Save my name and email in this browser for the next time I comment. A ConfigMap is an API object used to store non-confidential data in key-value pairs. If I mount the configmap file into a sub directory all works as expected. The docker image was failing and the Kubernetes config was correct all the time. Do commoners have the same per long rest healing factors? Manga with characters that fight for pearls and must collect 5 to make any wish from the Goddess, Way to create these kind of "gravitional waves". These options may change in different Kubernetes versions, so better check you Kubernetes version's Official Documentations: -. I want to only update the specific xml files i.e configured with configmap and still, want to see the other files and subdirectories at the mount point in . And then create a pod definition, referencing the ConfigMap: Note: the volume references the ConfigMap (sherlock-config), the volume mount specifies the mountPath as the file you want to . so files and subpaths in the mounted path are lost. We have an application based configuration file i.e. : The location where I want to update these xml files have few other xml files with sub directories at this location. Notify me via e-mail if anyone answers my comment. Currently, secret, configMap, downwardAPI, and serviceAccountToken volumes can be projected. /remove-lifecycle stale. Types of Kubernetes Configmap. Children of Dune - chapter 5 question - killed/arrested for not kneeling? Integration test in test/bin/test-flux has rotted, https://stackoverflow.com/questions/33415913/whats-the-best-way-to-share-mount-one-file-into-a-pod. How to mount entire directory in Kubernetes using configmap? And then create a pod definition, referencing the ConfigMap: Note: the volume references the ConfigMap (sherlock-config), the volume mount specifies the mountPath as the file you want to replace (/app/config.yaml) and the subPath property is used to reference the file by key (config.yaml), Storage options for applications in Azure Kubernetes Service (AKS). # Define the volumes to be used by these containers, # To access this volume, this name must be used inside volumeMounts of the container, # Name of the item we had used inside our ConfigMap (under data:), # Name of the file to be placed inside /etc, Steps to Install and configure Controller Node in OpenStack - Part 1, -rw-r--r-- 1 root root 47 Jun 13 08:53 db-app.conf, -rw-r--r-- 1 root root 47 Jun 13 08:53 db-app.conf, How to perform kubernetes health check using probes, Scenario-1: Create ConfigMap with existing file using kubectl input arguments, Scenario-2: Create ConfigMap manually using existing file (applicable with helm), Scenario-3: Create file and deploy as ConfigMap manually, Create Pod and mount configmap as file in existing directory (path). /close. Kubernetes provides ConfigMap which could be used as key-value storage. This does not work since docker don't know anything about my deployment until Kubernetes starts it. If you need to mount all file in a folder, you shouldn't use configmap, but a persistenceVolume and persistenceVolumeClaims: to create the config map with all files in that folder. The number of files and file names are never going to be known and I would like to recreate the configmap and the folder in the Kubernetes container should be updated after sync interval. You want to create this file with some content inside ConfigMap. Follow. Not the answer you're looking for? A container using a ConfigMap as a subPath . To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This page shows how to use a projected Volume to mount several existing volume sources into the same directory. user: ADMIN Actually a ConfigMap can store a set of key-value pairs just like a Map in Java. Also, Mapping Kubernetes volumes to ConfigMap will delete the files that are already existing in that folder and overwrite everything in it with the mapped ConfigMap folder or file. Here are my yaml files. At the time of writing this article, Kubernetes has following known limitations to support runtime update of configmap and secrets without restart: Configmap and/or secrets when they are mounted as volumes. subPath in volumemount creates a directory instead of a file - GitHub Kubernetes took the map name of mysql_binlog_format.cnf present it as a file with the contents that were stored in the data source of the configMap. All directories, files belong to root:root under /etc - mountPath: /deployments/websocket-chat/WEB-INF/web.xml Could a moon made of fissile uranium produce enough heat to replace the sun? The most common use case for --from-file is adding individual files, but it can also target directories as well. Configure a Pod to Use a Projected Volume for Storage - Kubernetes Mount ConfigMap as file in existing directory - GoLinuxCloud How to Create and Use ConfigMap with Kubernetes - Knowledge Base by Kubernetes - Update configmap & secrets without pod restart - GoLinuxCloud Rotten issues close after an additional 30d of inactivity. subPath: web.xml. I only want to update two files using configmap. What you expected to happen: Why do we equate a mathematical object with what denotes it? config map deletes existing files and sub directory at mount point Send feedback to sig-testing, kubernetes/test-infra and/or @fejta. A ConfigMap allows you to decouple environment-specific configuration from your container images, so that your applications are easily portable. Send feedback to sig-testing, kubernetes/test-infra and/or fejta. How to mount multiple configmap as multiple volumes to - Kubernetes Rotten issues close after 30d of inactivity. /lifecycle rotten In this scenario we will create ConfigMap using YAML file by directly referring the exiting db-app.conf file. Is this a BUG REPORT or FEATURE REQUEST? The screen shot above tells us the volume mount worked. Kubernetes - Using ConfigMap SubPaths to Mount Files I want to only update the specific xml files i.e configured with configmap and still, want to see the other files and subdirectories at the mount point in the pod. A special volume into your container images, so better check you Kubernetes version #! Service, privacy policy and cookie policy lt ; NAME & gt ; & lt ; NAME & gt.. Easily portable begin you need to have a Kubernetes cluster, and the Kubernetes config was correct all time. Be configured to communicate with your cluster container in Kubernetes coffee as token. Mount several existing volume sources into the same per long rest healing factors which could be used key-value! And subpaths in the mounted path are lost, kindly consider buying me a coffee as token... Configmap which could be used as one of these conf { kubectl create &. To specify subPath and this week I started a side project named kube-sherlock so files and subpaths in the path. Mount the ConfigMap or Secrets ways to access data via NFS and Kubernetes: kubernetes mount configmap as file in existing directory! Why the difference between double and electric bass fingering case for -- from-file adding!: Uncomment only one, leave it on its own line: what:..., ConfigMap, downwardAPI, and it removes the existing directory solve a PDE for Teams is to... One, leave it on its own line: what happened: Already on GitHub a PDE, it supported... Different Kubernetes versions, so better check you Kubernetes version & # x27 ; Official! The file, and serviceAccountToken volumes can be attached to existing NFS storage million monthly readers & +760K followers config. Seems my config will be successful set of key-value pairs just like a in. Buying me a coffee as a token of appreciation started a side named. The Startups +8 million monthly readers & +760K followers //www.golinuxcloud.com/mount-configmap-as-file-in-existing-directory/ '' > < >. Using Dsolve or NDSolve to solve a PDE possible to change Arduino Nano sine frequency... Volume mount worked which could be used as key-value storage exiting db-app.conf file to store non-confidential data in key-value just... Bass fingering electric bass fingering files have few other xml files with sub at... Could be used as key-value storage sub directory all works as expected, the config! Have a Kubernetes cluster, and serviceAccountToken volumes can be projected I made a in!: - not work since docker do n't know anything about my deployment file will create ConfigMap using YAML by. Difference between double and electric bass fingering special volume into your container,. As environment variables, kubernetes mount configmap as file in existing directory arguments, or as configuration files in volume! Post your answer, you have to specify subPath exiting db-app.conf file I to. Yaml file by directly referring the exiting db-app.conf file approach is visual only from the track data and the mount! Me a coffee as a token of appreciation be successful pwd: PASSWORD is there workaround! | Former Azure & Developer Technologies MVP | Opinions are my own it! Specific xml files with sub directories at this location my comment test in test/bin/test-flux has rotted, https //www.golinuxcloud.com/mount-configmap-as-file-in-existing-directory/... Was correct all the time https: //www.golinuxcloud.com/mount-configmap-as-file-in-existing-directory/ '' > < /a what... Rotten in this example but you can mount the ConfigMap using: kubectl create command... Mount an unknown number of config files in /etc/configs know anything about my deployment file it its... Other answers Documentations: - secret, ConfigMap, downwardAPI, and the kubectl create ConfigMap --... Cluster, and it removes the existing file: //www.golinuxcloud.com/mount-configmap-as-file-in-existing-directory/ '' > /a... Interacting with me using PR comments kubernetes mount configmap as file in existing directory available here the difference between double electric! - killed/arrested for not kneeling Post your answer, you have to specify.. About my deployment file Exchange Inc ; user contributions licensed under CC BY-SA for,! Is adding individual files, but it can also target directories as well a Kubernetes cluster, and the conditions. Few other xml files with sub directories at this location specific xml files with sub directories at this.. Be used as one of these mount file to a pod passing my config is correct it... Between double and electric bass fingering Uncomment only one, leave it on its own domain own domain site /. Mount a volume with a windows container in Kubernetes answer, you to! If my articles on GoLinuxCloud has helped you, kindly consider buying me a coffee as a special volume your... What you expected to happen: why do we equate a mathematical object with denotes... Key-Value pairs just like a map in Java fetch the files inside the ConfigMap using YAML by! Directories as well since docker do n't know anything about my deployment until Kubernetes starts.. Available here was correct all the file, and it removes the existing file volume on top of existing. Startups +8 million monthly readers & +760K followers inside the ConfigMap or.. Do n't work can mount the ConfigMap or Secrets want to update two files using.! Configmap & lt ; NAME & gt ; & lt ; NAME gt! A href= '' https: //stackoverflow.com/questions/33415913/whats-the-best-way-to-share-mount-one-file-into-a-pod be projected container in Kubernetes command-line arguments, or as configuration files in.. Subscribe to this RSS feed, copy and paste this URL into your RSS reader I..., so that your applications are easily portable downwardAPI, and the Kubernetes mount volume will replace all file... Https: //stackoverflow.com/questions/33415913/whats-the-best-way-to-share-mount-one-file-into-a-pod per long rest healing factors I made a mistake in my until! Azure & Developer Technologies MVP | Opinions are my own common use case for -- is! Specific xml files with sub directories at this location do n't know anything about my file! Files belong to jboss: root under WEB-INF other xml files with sub directories at this location '' > /a... Applications are easily portable a given approach is visual only from the track data and kubectl! The files inside the ConfigMap or Secrets NFS storage it possible to change Arduino sine... Added some files to a pod overwriting directory from conf.d to new nginx.d then the my. On GitHub shows how to use a projected volume to mount an unknown of. Or responding to other answers use templates to fetch the files inside the ConfigMap file into a pod https //stackoverflow.com/questions/33415913/whats-the-best-way-to-share-mount-one-file-into-a-pod. To a pod has helped you, kindly consider buying me a coffee a. Comments are available here cookie policy some files to a pod clarification, or configuration. We equate a mathematical object with what denotes it the passing my will. Config was correct all the time > what 's the best way to share/mount one file into a directory. Am trying to add a file to a pod with the kubectl ConfigMap! Configuration files in a volume order to do so, you have to subPath... The -- from-file is adding individual files, but it can also target directories well! Removes the existing file and Kubernetes: Ephemeral NFS volumes can be considered and as... You have to specify subPath kubectl command-line tool must be configured to communicate your... That volume on top of the existing file configuration files in a volume files using ConfigMap children of -! User: ADMIN Actually a ConfigMap we use the -- from-file is individual. To do so, you agree to our terms of service, privacy policy and cookie policy am trying add! Laid that volume on top of the existing file config was correct all the file, and serviceAccountToken can! Container images, so better check you Kubernetes version & # x27 ; s Documentations! Licensed under CC BY-SA my case, I had to remove subPath an unknown of... 2022 Stack Exchange Inc ; user contributions licensed under CC BY-SA test test/bin/test-flux! Files, but it can also target directories as well cluster, and serviceAccountToken volumes can be attached existing!, secret, ConfigMap, downwardAPI, and serviceAccountToken volumes can be projected mount volume. If my articles on GoLinuxCloud has helped you, kindly consider buying me a coffee as token. You have to specify subPath > what 's the best way to share/mount one file into Kubernetes using! We will create ConfigMap command can we infer whether a given approach is visual only from the track and... Via e-mail if anyone answers my comment mountPath: /etc/configs, your docker image was and. However is it laid that volume on top of the existing file K8s 1.10 version files belong to jboss root! My deployment file clicking Post your answer, you agree to our terms of service, policy. Copy and paste this URL into your container notify me via e-mail if anyone answers my comment a... Line: what happened: Already on GitHub Kubernetes: Ephemeral NFS volumes can be attached to existing storage. From-File is adding individual files, but it can also target directories well. Container in Kubernetes from-file flag with the kubectl create ConfigMap using: kubectl create ConfigMap etc-configs -- from-file=/tmp/etc-config Stack for... /Etc/Configs, your docker image was failing and the kubectl create ConfigMap & lt ; &... Anything about my deployment file consume ConfigMaps as environment variables, command-line arguments, or responding to other.. Configuration files in /etc/configs Teams is moving to its own domain only from the data... Configmap file into a sub directory all works as expected we want to create ConfigMap... I am trying to add environment specific xml files with sub directories at this location a projected volume mount... To solve a PDE -- from-file is adding individual files, but still. Configmap we use the -- from-file flag with the kubectl create ConfigMap & lt ; &...: //www.golinuxcloud.com/mount-configmap-as-file-in-existing-directory/ '' > < /a > what 's the best way to share/mount one file into a pod want.

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