How best to have files on volumes in Kubernetes using helm charts?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}
The plan is to move my dockerized application to Kubernetes.
The docker container uses couple of files - which I used to mount on the docker volumes by specifying in the docker-compose file:
volumes:
- ./license.dat:/etc/sys0/license.dat
- ./config.json:/etc/sys0/config.json
The config file would be different for different environments, and the license file would be the same across.
How do I define this in a helm template file (yaml) so that it is available for the running application?
What is generally the best practise for this? Is it also possible to define the configuration values in values.yaml and the config.json file could get it?
kubernetes 
kubernetes-helm docker-volume asked Nov 16 '18 at 15:41
ChillaxChillax
1,354123463
add a comment |
The plan is to move my dockerized application to Kubernetes.
The docker container uses couple of files - which I used to mount on the docker volumes by specifying in the docker-compose file:
volumes:
- ./license.dat:/etc/sys0/license.dat
- ./config.json:/etc/sys0/config.json
The config file would be different for different environments, and the license file would be the same across.
How do I define this in a helm template file (yaml) so that it is available for the running application?
What is generally the best practise for this? Is it also possible to define the configuration values in values.yaml and the config.json file could get it?
kubernetes kubernetes-helm docker-volume asked Nov 16 '18 at 15:41
ChillaxChillax
1,354123463
1
Have you read docs.helm.sh/chart_template_guide/…? I'd probably use a Secret and not a ConfigMap as in the example there, but it's outlined pretty well in the Helm docs.
– David Maze
Nov 16 '18 at 15:48
add a comment |
The plan is to move my dockerized application to Kubernetes.
The docker container uses couple of files - which I used to mount on the docker volumes by specifying in the docker-compose file:
volumes:
- ./license.dat:/etc/sys0/license.dat
- ./config.json:/etc/sys0/config.json
The config file would be different for different environments, and the license file would be the same across.
How do I define this in a helm template file (yaml) so that it is available for the running application?
What is generally the best practise for this? Is it also possible to define the configuration values in values.yaml and the config.json file could get it?
kubernetes kubernetes-helm docker-volume asked Nov 16 '18 at 15:41
ChillaxChillax
1,354123463
The plan is to move my dockerized application to Kubernetes.
The docker container uses couple of files - which I used to mount on the docker volumes by specifying in the docker-compose file:
volumes:
- ./license.dat:/etc/sys0/license.dat
- ./config.json:/etc/sys0/config.json
The config file would be different for different environments, and the license file would be the same across.
How do I define this in a helm template file (yaml) so that it is available for the running application?
What is generally the best practise for this? Is it also possible to define the configuration values in values.yaml and the config.json file could get it?
kubernetes kubernetes-helm docker-volume kubernetes kubernetes-helm docker-volume asked Nov 16 '18 at 15:41
ChillaxChillax
1,354123463
asked Nov 16 '18 at 15:41
ChillaxChillax
1,354123463
asked Nov 16 '18 at 15:41
ChillaxChillax
1,354123463
asked Nov 16 '18 at 15:41
ChillaxChillax
1,354123463
asked Nov 16 '18 at 15:41
ChillaxChillax
1,354123463
1,354123463
1
Have you read docs.helm.sh/chart_template_guide/…? I'd probably use a Secret and not a ConfigMap as in the example there, but it's outlined pretty well in the Helm docs.
– David Maze
Nov 16 '18 at 15:48
add a comment |
1
Have you read docs.helm.sh/chart_template_guide/…? I'd probably use a Secret and not a ConfigMap as in the example there, but it's outlined pretty well in the Helm docs.
– David Maze
Nov 16 '18 at 15:48
1
1
Have you read docs.helm.sh/chart_template_guide/…? I'd probably use a Secret and not a ConfigMap as in the example there, but it's outlined pretty well in the Helm docs.
– David Maze
Nov 16 '18 at 15:48
Have you read docs.helm.sh/chart_template_guide/…? I'd probably use a Secret and not a ConfigMap as in the example there, but it's outlined pretty well in the Helm docs.
– David Maze
Nov 16 '18 at 15:48
add a comment |
1 Answer
1
active
oldest
votes
Since you are dealing with json a good example to follow might be the official stable/centrifugo chart. It defines a ConfigMap that contains a config.json file:
data:
config.json: |-
{{ toJson .Values.config| indent 4 }}
So it takes a config section from the values.yaml and transforms it to json using the toJson function. The config can be whatever you want define in that yaml - the chart has:
config:
web: true
namespaces:
- name: public
anonymous: true
publish: true
...
In the deployment.yaml it creates a volume from the configmap:
volumes:
- name: {{ template "centrifugo.fullname" . }}-config
configMap:
name: {{ template "centrifugo.fullname" . }}-config
Note that {{ template "centrifugo.fullname" . }}-config matches the name of the ConfigMap.
And mounts it into the deployment's pod/s:
volumeMounts:
- name: "{{ template "centrifugo.fullname" . }}-config"
mountPath: "/centrifugo"
readOnly: true
This approach would let you populate the json config file from the values.yaml so that you can set different values for different environments by supplying custom values file per env to override the default one in the chart.
To handle the license.dat you can add an extra entry to the ConfigMap to define an additional file but with static content embedded. Since that is a license you may want to switch the ConfigMap to a Secret instead, which is a simple change of replacing the word ConfigMap for Secret in the definitions. You could try it with ConfigMap first though.
answered Nov 16 '18 at 17:11
Ryan DawsonRyan Dawson
4,9023428
Could we have this mounted to the same path as where the docker container expects it ? that is: /etc/sys0/ ? If we do not need it as part of vlaues, then we just need to use the ConfigMap without the centrifugo chart I believe?
– Chillax
Nov 20 '18 at 11:29
Yes I don't mean to suggest using the centrifugo class. I meant to suggest copying the approach that they take to incorporate your own configmap into your chart - basically by copy-pasting their code and changing the names to your chart name and changing the path to your desired mount path. If you don't need it as part of the values then you could just put the static content into the configmap (or load with Files.Get) but would still need to mount the configmap.
– Ryan Dawson
Nov 20 '18 at 11:41
happy to chat if you like chat.stackoverflow.com/rooms/183948/…
– Ryan Dawson
Nov 20 '18 at 11:42
1
Thanks. I did try ConfigMap and it is working as expected. I will try getting it from values later and update how it goes.
– Chillax
Nov 21 '18 at 16:27
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53341089%2fhow-best-to-have-files-on-volumes-in-kubernetes-using-helm-charts%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Since you are dealing with json a good example to follow might be the official stable/centrifugo chart. It defines a ConfigMap that contains a config.json file:
data:
config.json: |-
{{ toJson .Values.config| indent 4 }}
So it takes a config section from the values.yaml and transforms it to json using the toJson function. The config can be whatever you want define in that yaml - the chart has:
config:
web: true
namespaces:
- name: public
anonymous: true
publish: true
...
In the deployment.yaml it creates a volume from the configmap:
volumes:
- name: {{ template "centrifugo.fullname" . }}-config
configMap:
name: {{ template "centrifugo.fullname" . }}-config
Note that {{ template "centrifugo.fullname" . }}-config matches the name of the ConfigMap.
And mounts it into the deployment's pod/s:
volumeMounts:
- name: "{{ template "centrifugo.fullname" . }}-config"
mountPath: "/centrifugo"
readOnly: true
This approach would let you populate the json config file from the values.yaml so that you can set different values for different environments by supplying custom values file per env to override the default one in the chart.
To handle the license.dat you can add an extra entry to the ConfigMap to define an additional file but with static content embedded. Since that is a license you may want to switch the ConfigMap to a Secret instead, which is a simple change of replacing the word ConfigMap for Secret in the definitions. You could try it with ConfigMap first though.
answered Nov 16 '18 at 17:11
Ryan DawsonRyan Dawson
4,9023428
Could we have this mounted to the same path as where the docker container expects it ? that is: /etc/sys0/ ? If we do not need it as part of vlaues, then we just need to use the ConfigMap without the centrifugo chart I believe?
– Chillax
Nov 20 '18 at 11:29
Yes I don't mean to suggest using the centrifugo class. I meant to suggest copying the approach that they take to incorporate your own configmap into your chart - basically by copy-pasting their code and changing the names to your chart name and changing the path to your desired mount path. If you don't need it as part of the values then you could just put the static content into the configmap (or load with Files.Get) but would still need to mount the configmap.
– Ryan Dawson
Nov 20 '18 at 11:41
happy to chat if you like chat.stackoverflow.com/rooms/183948/…
– Ryan Dawson
Nov 20 '18 at 11:42
1
Thanks. I did try ConfigMap and it is working as expected. I will try getting it from values later and update how it goes.
– Chillax
Nov 21 '18 at 16:27
add a comment |
Since you are dealing with json a good example to follow might be the official stable/centrifugo chart. It defines a ConfigMap that contains a config.json file:
data:
config.json: |-
{{ toJson .Values.config| indent 4 }}
So it takes a config section from the values.yaml and transforms it to json using the toJson function. The config can be whatever you want define in that yaml - the chart has:
config:
web: true
namespaces:
- name: public
anonymous: true
publish: true
...
In the deployment.yaml it creates a volume from the configmap:
volumes:
- name: {{ template "centrifugo.fullname" . }}-config
configMap:
name: {{ template "centrifugo.fullname" . }}-config
Note that {{ template "centrifugo.fullname" . }}-config matches the name of the ConfigMap.
And mounts it into the deployment's pod/s:
volumeMounts:
- name: "{{ template "centrifugo.fullname" . }}-config"
mountPath: "/centrifugo"
readOnly: true
This approach would let you populate the json config file from the values.yaml so that you can set different values for different environments by supplying custom values file per env to override the default one in the chart.
To handle the license.dat you can add an extra entry to the ConfigMap to define an additional file but with static content embedded. Since that is a license you may want to switch the ConfigMap to a Secret instead, which is a simple change of replacing the word ConfigMap for Secret in the definitions. You could try it with ConfigMap first though.
answered Nov 16 '18 at 17:11
Ryan DawsonRyan Dawson
4,9023428
Could we have this mounted to the same path as where the docker container expects it ? that is: /etc/sys0/ ? If we do not need it as part of vlaues, then we just need to use the ConfigMap without the centrifugo chart I believe?
– Chillax
Nov 20 '18 at 11:29
Yes I don't mean to suggest using the centrifugo class. I meant to suggest copying the approach that they take to incorporate your own configmap into your chart - basically by copy-pasting their code and changing the names to your chart name and changing the path to your desired mount path. If you don't need it as part of the values then you could just put the static content into the configmap (or load with Files.Get) but would still need to mount the configmap.
– Ryan Dawson
Nov 20 '18 at 11:41
happy to chat if you like chat.stackoverflow.com/rooms/183948/…
– Ryan Dawson
Nov 20 '18 at 11:42
1
Thanks. I did try ConfigMap and it is working as expected. I will try getting it from values later and update how it goes.
– Chillax
Nov 21 '18 at 16:27
add a comment |
Since you are dealing with json a good example to follow might be the official stable/centrifugo chart. It defines a ConfigMap that contains a config.json file:
data:
config.json: |-
{{ toJson .Values.config| indent 4 }}
So it takes a config section from the values.yaml and transforms it to json using the toJson function. The config can be whatever you want define in that yaml - the chart has:
config:
web: true
namespaces:
- name: public
anonymous: true
publish: true
...
In the deployment.yaml it creates a volume from the configmap:
volumes:
- name: {{ template "centrifugo.fullname" . }}-config
configMap:
name: {{ template "centrifugo.fullname" . }}-config
Note that {{ template "centrifugo.fullname" . }}-config matches the name of the ConfigMap.
And mounts it into the deployment's pod/s:
volumeMounts:
- name: "{{ template "centrifugo.fullname" . }}-config"
mountPath: "/centrifugo"
readOnly: true
This approach would let you populate the json config file from the values.yaml so that you can set different values for different environments by supplying custom values file per env to override the default one in the chart.
To handle the license.dat you can add an extra entry to the ConfigMap to define an additional file but with static content embedded. Since that is a license you may want to switch the ConfigMap to a Secret instead, which is a simple change of replacing the word ConfigMap for Secret in the definitions. You could try it with ConfigMap first though.
answered Nov 16 '18 at 17:11
Ryan DawsonRyan Dawson
4,9023428
Since you are dealing with json a good example to follow might be the official stable/centrifugo chart. It defines a ConfigMap that contains a config.json file:
data:
config.json: |-
{{ toJson .Values.config| indent 4 }}
So it takes a config section from the values.yaml and transforms it to json using the toJson function. The config can be whatever you want define in that yaml - the chart has:
config:
web: true
namespaces:
- name: public
anonymous: true
publish: true
...
In the deployment.yaml it creates a volume from the configmap:
volumes:
- name: {{ template "centrifugo.fullname" . }}-config
configMap:
name: {{ template "centrifugo.fullname" . }}-config
Note that {{ template "centrifugo.fullname" . }}-config matches the name of the ConfigMap.
And mounts it into the deployment's pod/s:
volumeMounts:
- name: "{{ template "centrifugo.fullname" . }}-config"
mountPath: "/centrifugo"
readOnly: true
This approach would let you populate the json config file from the values.yaml so that you can set different values for different environments by supplying custom values file per env to override the default one in the chart.
To handle the license.dat you can add an extra entry to the ConfigMap to define an additional file but with static content embedded. Since that is a license you may want to switch the ConfigMap to a Secret instead, which is a simple change of replacing the word ConfigMap for Secret in the definitions. You could try it with ConfigMap first though.
answered Nov 16 '18 at 17:11
Ryan DawsonRyan Dawson
4,9023428
edited Nov 17 '18 at 9:39
answered Nov 16 '18 at 17:11
Ryan DawsonRyan Dawson
4,9023428
answered Nov 16 '18 at 17:11
Ryan DawsonRyan Dawson
4,9023428
answered Nov 16 '18 at 17:11
Ryan DawsonRyan Dawson
4,9023428
4,9023428
Could we have this mounted to the same path as where the docker container expects it ? that is: /etc/sys0/ ? If we do not need it as part of vlaues, then we just need to use the ConfigMap without the centrifugo chart I believe?
– Chillax
Nov 20 '18 at 11:29
Yes I don't mean to suggest using the centrifugo class. I meant to suggest copying the approach that they take to incorporate your own configmap into your chart - basically by copy-pasting their code and changing the names to your chart name and changing the path to your desired mount path. If you don't need it as part of the values then you could just put the static content into the configmap (or load with Files.Get) but would still need to mount the configmap.
– Ryan Dawson
Nov 20 '18 at 11:41
happy to chat if you like chat.stackoverflow.com/rooms/183948/…
– Ryan Dawson
Nov 20 '18 at 11:42
1
Thanks. I did try ConfigMap and it is working as expected. I will try getting it from values later and update how it goes.
– Chillax
Nov 21 '18 at 16:27
add a comment |
Could we have this mounted to the same path as where the docker container expects it ? that is: /etc/sys0/ ? If we do not need it as part of vlaues, then we just need to use the ConfigMap without the centrifugo chart I believe?
– Chillax
Nov 20 '18 at 11:29
Yes I don't mean to suggest using the centrifugo class. I meant to suggest copying the approach that they take to incorporate your own configmap into your chart - basically by copy-pasting their code and changing the names to your chart name and changing the path to your desired mount path. If you don't need it as part of the values then you could just put the static content into the configmap (or load with Files.Get) but would still need to mount the configmap.
– Ryan Dawson
Nov 20 '18 at 11:41
happy to chat if you like chat.stackoverflow.com/rooms/183948/…
– Ryan Dawson
Nov 20 '18 at 11:42
1
Thanks. I did try ConfigMap and it is working as expected. I will try getting it from values later and update how it goes.
– Chillax
Nov 21 '18 at 16:27
Could we have this mounted to the same path as where the docker container expects it ? that is: /etc/sys0/ ? If we do not need it as part of vlaues, then we just need to use the ConfigMap without the centrifugo chart I believe?
– Chillax
Nov 20 '18 at 11:29
Could we have this mounted to the same path as where the docker container expects it ? that is: /etc/sys0/ ? If we do not need it as part of vlaues, then we just need to use the ConfigMap without the centrifugo chart I believe?
– Chillax
Nov 20 '18 at 11:29
Yes I don't mean to suggest using the centrifugo class. I meant to suggest copying the approach that they take to incorporate your own configmap into your chart - basically by copy-pasting their code and changing the names to your chart name and changing the path to your desired mount path. If you don't need it as part of the values then you could just put the static content into the configmap (or load with Files.Get) but would still need to mount the configmap.
– Ryan Dawson
Nov 20 '18 at 11:41
Yes I don't mean to suggest using the centrifugo class. I meant to suggest copying the approach that they take to incorporate your own configmap into your chart - basically by copy-pasting their code and changing the names to your chart name and changing the path to your desired mount path. If you don't need it as part of the values then you could just put the static content into the configmap (or load with Files.Get) but would still need to mount the configmap.
– Ryan Dawson
Nov 20 '18 at 11:41
happy to chat if you like chat.stackoverflow.com/rooms/183948/…
– Ryan Dawson
Nov 20 '18 at 11:42
happy to chat if you like chat.stackoverflow.com/rooms/183948/…
– Ryan Dawson
Nov 20 '18 at 11:42
1
1
Thanks. I did try ConfigMap and it is working as expected. I will try getting it from values later and update how it goes.
– Chillax
Nov 21 '18 at 16:27
Thanks. I did try ConfigMap and it is working as expected. I will try getting it from values later and update how it goes.
– Chillax
Nov 21 '18 at 16:27
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53341089%2fhow-best-to-have-files-on-volumes-in-kubernetes-using-helm-charts%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
Have you read docs.helm.sh/chart_template_guide/…? I'd probably use a Secret and not a ConfigMap as in the example there, but it's outlined pretty well in the Helm docs.
– David Maze
Nov 16 '18 at 15:48