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Add codenew shortcode to configure-pod-configmap task file and sanitize the example files (#13078)

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This commit is contained in:
Dani Comnea
2019-03-12 03:28:38 +00:00
committed by Kubernetes Prow Robot
parent 5e50314b27
commit e38f800d81
14 changed files with 287 additions and 214 deletions
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content/en/docs/tasks/configure-pod-container/configmap/kubectl/game-env-file.properties
-5
View File
@@ -1,5 +0,0 @@
enemies=aliens
lives=3
allowed="true"
# This comment and the empty line above it are ignored
content/en/docs/tasks/configure-pod-container/configmap/kubectl/game.properties
-7
View File
@@ -1,7 +0,0 @@
enemies=aliens
lives=3
enemies.cheat=true
enemies.cheat.level=noGoodRotten
secret.code.passphrase=UUDDLRLRBABAS
secret.code.allowed=true
secret.code.lives=30
content/en/docs/tasks/configure-pod-container/configmap/kubectl/ui-env-file.properties
-3
View File
@@ -1,3 +0,0 @@
color=purple
textmode=true
how=fairlyNice
content/en/docs/tasks/configure-pod-container/configmap/kubectl/ui.properties
-4
View File
@@ -1,4 +0,0 @@
color.good=purple
color.bad=yellow
allow.textmode=true
how.nice.to.look=fairlyNice
content/en/docs/tasks/configure-pod-container/configure-pod-configmap.md
+132 -202
View File
@@ -47,16 +47,20 @@ You can use `kubectl create configmap` to create a ConfigMap from multiple files
For example:
```shell
mkdir -p configure-pod-container/configmap/kubectl/
wget https://k8s.io/docs/tasks/configure-pod-container/configmap/kubectl/game.properties -O configure-pod-container/configmap/kubectl/game.properties
wget https://k8s.io/docs/tasks/configure-pod-container/configmap/kubectl/ui.properties -O configure-pod-container/configmap/kubectl/ui.properties
kubectl create configmap game-config --from-file=configure-pod-container/configmap/kubectl/
# Create the local directory
mkdir -p configure-pod-container/configmap/
# Download the sample files into `configure-pod-container/configmap/` directory
wget https://k8s.io/examples/configmap/game.properties -O configure-pod-container/configmap/game.properties
wget https://k8s.io/examples/configmap/configmap/ui.properties -O configure-pod-container/configmap/ui.properties
# Create the configmap
kubectl create configmap game-config --from-file=configure-pod-container/configmap/
```
combines the contents of the `configure-pod-container/configmap/kubectl/` directory
combines the contents of the `configure-pod-container/configmap/` directory
```shell
ls configure-pod-container/configmap/kubectl/
game.properties
ui.properties
```
@@ -65,6 +69,10 @@ into the following ConfigMap:
```shell
kubectl describe configmaps game-config
```
where the output is similar to this:
```
Name: game-config
Namespace: default
Labels: <none>
@@ -76,11 +84,12 @@ game.properties: 158 bytes
ui.properties: 83 bytes
```
The `game.properties` and `ui.properties` files in the `configure-pod-container/configmap/kubectl/` directory are represented in the `data` section of the ConfigMap.
The `game.properties` and `ui.properties` files in the `configure-pod-container/configmap/` directory are represented in the `data` section of the ConfigMap.
```shell
kubectl get configmaps game-config -o yaml
```
The output is similar to this:
```yaml
apiVersion: v1
@@ -115,13 +124,18 @@ You can use `kubectl create configmap` to create a ConfigMap from an individual
For example,
```shell
kubectl create configmap game-config-2 --from-file=configure-pod-container/configmap/kubectl/game.properties
kubectl create configmap game-config-2 --from-file=configure-pod-container/configmap/game.properties
```
would produce the following ConfigMap:
```shell
kubectl describe configmaps game-config-2
```
where the output is similar to this:
```
Name: game-config-2
Namespace: default
Labels: <none>
@@ -132,14 +146,21 @@ Data
game.properties: 158 bytes
```
You can pass in the `--from-file` argument multiple times to create a ConfigMap from multiple data sources.
You can pass in the `--from-file` argument multiple times to create a ConfigMap from multiple data sources.
```shell
kubectl create configmap game-config-2 --from-file=configure-pod-container/configmap/kubectl/game.properties --from-file=configure-pod-container/configmap/kubectl/ui.properties
kubectl create configmap game-config-2 --from-file=configure-pod-container/configmap/game.properties --from-file=configure-pod-container/configmap/ui.properties
```
Describe the above `game-config-2` configmap created
```shell
kubectl describe configmaps game-config-2
```
The output is similar to this:
```
Name: game-config-2
Namespace: default
Labels: <none>
@@ -152,6 +173,7 @@ ui.properties: 83 bytes
```
Use the option `--from-env-file` to create a ConfigMap from an env-file, for example:
```shell
# Env-files contain a list of environment variables.
# These syntax rules apply:
@@ -160,8 +182,11 @@ Use the option `--from-env-file` to create a ConfigMap from an env-file, for exa
# Blank lines are ignored.
# There is no special handling of quotation marks (i.e. they will be part of the ConfigMap value)).
wget https://k8s.io/docs/tasks/configure-pod-container/configmap/kubectl/game-env-file.properties -O configure-pod-container/configmap/kubectl/game-env-file.properties
cat configure-pod-container/configmap/kubectl/game-env-file.properties
# Download the sample files into `configure-pod-container/configmap/` directory
wget https://k8s.io/examples/configmap/game-env-file.properties -O configure-pod-container/configmap/game-env-file.properties
# The env-file `game-env-file.properties` looks like below
cat configure-pod-container/configmap/game-env-file.properties
enemies=aliens
lives=3
allowed="true"
@@ -171,7 +196,7 @@ allowed="true"
```shell
kubectl create configmap game-config-env-file \
--from-env-file=configure-pod-container/configmap/kubectl/game-env-file.properties
--from-env-file=configure-pod-container/configmap/game-env-file.properties
```
would produce the following ConfigMap:
@@ -180,6 +205,7 @@ would produce the following ConfigMap:
kubectl get configmap game-config-env-file -o yaml
```
where the output is similar to this:
```yaml
apiVersion: v1
data:
@@ -199,10 +225,13 @@ metadata:
When passing `--from-env-file` multiple times to create a ConfigMap from multiple data sources, only the last env-file is used:
```shell
wget https://k8s.io/docs/tasks/configure-pod-container/configmap/kubectl/ui-env-file.properties -O configure-pod-container/configmap/kubectl/ui-env-file.properties
# Download the sample files into `configure-pod-container/configmap/` directory
wget https://k8s.io/examples/configmap/ui-env-file.properties -O configure-pod-container/configmap/ui-env-file.properties
# Create the configmap
kubectl create configmap config-multi-env-files \
--from-env-file=configure-pod-container/configmap/kubectl/game-env-file.properties \
--from-env-file=configure-pod-container/configmap/kubectl/ui-env-file.properties
--from-env-file=configure-pod-container/configmap/game-env-file.properties \
--from-env-file=configure-pod-container/configmap/ui-env-file.properties
```
would produce the following ConfigMap:
@@ -211,6 +240,7 @@ would produce the following ConfigMap:
kubectl get configmap config-multi-env-files -o yaml
```
where the output is similar to this:
```yaml
apiVersion: v1
data:
@@ -240,11 +270,15 @@ where `<my-key-name>` is the key you want to use in the ConfigMap and `<path-to-
For example:
```shell
kubectl create configmap game-config-3 --from-file=game-special-key=configure-pod-container/configmap/kubectl/game.properties
kubectl create configmap game-config-3 --from-file=game-special-key=configure-pod-container/configmap/game.properties
```
would produce the following ConfigMap:
```
kubectl get configmaps game-config-3 -o yaml
```
where the output is similar to this:
```yaml
apiVersion: v1
data:
@@ -280,6 +314,7 @@ You can pass in multiple key-value pairs. Each pair provided on the command line
kubectl get configmaps special-config -o yaml
```
The output is similar to this:
```yaml
apiVersion: v1
data:
@@ -306,158 +341,83 @@ metadata:
kubectl create configmap special-config --from-literal=special.how=very
```
1. Assign the `special.how` value defined in the ConfigMap to the `SPECIAL_LEVEL_KEY` environment variable in the Pod specification.
2. Assign the `special.how` value defined in the ConfigMap to the `SPECIAL_LEVEL_KEY` environment variable in the Pod specification.
```shell
kubectl edit pod dapi-test-pod
```
{{< codenew file="pods/pod-single-configmap-env-variable.yaml" >}}
```yaml
apiVersion: v1
kind: Pod
metadata:
name: dapi-test-pod
spec:
containers:
- name: test-container
image: k8s.gcr.io/busybox
command: [ "/bin/sh", "-c", "env" ]
env:
# Define the environment variable
- name: SPECIAL_LEVEL_KEY
valueFrom:
configMapKeyRef:
# The ConfigMap containing the value you want to assign to SPECIAL_LEVEL_KEY
name: special-config
# Specify the key associated with the value
key: special.how
restartPolicy: Never
```
1. Save the changes to the Pod specification. Now, the Pod's output includes `SPECIAL_LEVEL_KEY=very`.
Create the Pod:
```shell
kubectl create -f https://k8s.io/examples/pods/pod-single-configmap-env-variable.yaml
```
Now, the Pod's output includes `SPECIAL_LEVEL_KEY=very`.
### Define container environment variables with data from multiple ConfigMaps
1. As with the previous example, create the ConfigMaps first.
* As with the previous example, create the ConfigMaps first.
```yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: special-config
namespace: default
data:
special.how: very
```
{{< codenew file="configmap/configmaps.yaml" >}}
```yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: env-config
namespace: default
data:
log_level: INFO
```
1. Define the environment variables in the Pod specification.
```yaml
apiVersion: v1
kind: Pod
metadata:
name: dapi-test-pod
spec:
containers:
- name: test-container
image: k8s.gcr.io/busybox
command: [ "/bin/sh", "-c", "env" ]
env:
- name: SPECIAL_LEVEL_KEY
valueFrom:
configMapKeyRef:
name: special-config
key: special.how
- name: LOG_LEVEL
valueFrom:
configMapKeyRef:
name: env-config
key: log_level
restartPolicy: Never
```
Create the ConfigMap:
1. Save the changes to the Pod specification. Now, the Pod's output includes `SPECIAL_LEVEL_KEY=very` and `LOG_LEVEL=INFO`.
```shell
kubectl create -f https://k8s.io/examples/configmap/configmaps.yaml
```
* Define the environment variables in the Pod specification.
{{< codenew file="pods/pod-multiple-configmap-env-variable.yaml" >}}
Create the Pod:
```shell
kubectl create -f https://k8s.io/examples/pods/pod-multiple-configmap-env-variable.yaml
```
Now, the Pod's output includes `SPECIAL_LEVEL_KEY=very` and `LOG_LEVEL=INFO`.
## Configure all key-value pairs in a ConfigMap as container environment variables
{{< note >}}
This functionality is available in Kubernetes v1.6 and later.
{{< /note >}}
{{< note >}}
This functionality is available in Kubernetes v1.6 and later.
{{< /note >}}
1. Create a ConfigMap containing multiple key-value pairs.
* Create a ConfigMap containing multiple key-value pairs.
```yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: special-config
namespace: default
data:
SPECIAL_LEVEL: very
SPECIAL_TYPE: charm
```
{{< codenew file="configmap/configmap-multikeys.yaml" >}}
1. Use `envFrom` to define all of the ConfigMap's data as container environment variables. The key from the ConfigMap becomes the environment variable name in the Pod.
Create the ConfigMap:
```shell
kubectl create -f https://k8s.io/examples/configmap/configmap-multikeys.yaml
```
* Use `envFrom` to define all of the ConfigMap's data as container environment variables. The key from the ConfigMap becomes the environment variable name in the Pod.
```yaml
apiVersion: v1
kind: Pod
metadata:
name: dapi-test-pod
spec:
containers:
- name: test-container
image: k8s.gcr.io/busybox
command: [ "/bin/sh", "-c", "env" ]
envFrom:
- configMapRef:
name: special-config
restartPolicy: Never
```
{{< codenew file="pods/pod-configmap-envFrom.yaml" >}}
1. Save the changes to the Pod specification. Now, the Pod's output includes `SPECIAL_LEVEL=very` and `SPECIAL_TYPE=charm`.
Create the Pod:
```shell
kubectl create -f https://k8s.io/examples/pods/pod-configmap-envFrom.yaml
```
Now, the Pod's output includes `SPECIAL_LEVEL=very` and `SPECIAL_TYPE=charm`.
## Use ConfigMap-defined environment variables in Pod commands
You can use ConfigMap-defined environment variables in the `command` section of the Pod specification using the `$(VAR_NAME)` Kubernetes substitution syntax.
For example:
For example, the following Pod specification
The following Pod specification
{{< codenew file="pods/pod-configmap-env-var-valueFrom.yaml" >}}
```yaml
apiVersion: v1
kind: Pod
metadata:
name: dapi-test-pod
spec:
containers:
- name: test-container
image: k8s.gcr.io/busybox
command: [ "/bin/sh", "-c", "echo $(SPECIAL_LEVEL_KEY) $(SPECIAL_TYPE_KEY)" ]
env:
- name: SPECIAL_LEVEL_KEY
valueFrom:
configMapKeyRef:
name: special-config
key: SPECIAL_LEVEL
- name: SPECIAL_TYPE_KEY
valueFrom:
configMapKeyRef:
name: special-config
key: SPECIAL_TYPE
restartPolicy: Never
created by running
```shell
kubectl create -f https://k8s.io/examples/pods/pod-configmap-env-var-valueFrom.yaml
```
produces the following output in the `test-container` container:
@@ -472,15 +432,12 @@ As explained in [Create ConfigMaps from files](#create-configmaps-from-files), w
The examples in this section refer to a ConfigMap named special-config, shown below.
```yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: special-config
namespace: default
data:
special.level: very
special.type: charm
{{< codenew file="configmap/configmap-multikeys.yaml" >}}
Create the ConfigMap:
```shell
kubectl create -f https://k8s.io/examples/configmap/configmap-multikeys.yaml
```
### Populate a Volume with data stored in a ConfigMap
@@ -489,29 +446,15 @@ Add the ConfigMap name under the `volumes` section of the Pod specification.
This adds the ConfigMap data to the directory specified as `volumeMounts.mountPath` (in this case, `/etc/config`).
The `command` section references the `special.level` item stored in the ConfigMap.
```yaml
apiVersion: v1
kind: Pod
metadata:
name: dapi-test-pod
spec:
containers:
- name: test-container
image: k8s.gcr.io/busybox
command: [ "/bin/sh", "-c", "ls /etc/config/" ]
volumeMounts:
- name: config-volume
mountPath: /etc/config
volumes:
- name: config-volume
configMap:
# Provide the name of the ConfigMap containing the files you want
# to add to the container
name: special-config
restartPolicy: Never
{{< codenew file="pods/pod-configmap-volume.yaml" >}}
Create the Pod:
```shell
kubectl create -f https://k8s.io/examples/pods/pod-configmap-volume.yaml
```
When the pod runs, the command (`"ls /etc/config/"`) produces the output below:
When the pod runs, the command `ls /etc/config/` produces the output below:
```shell
special.level
@@ -527,30 +470,15 @@ If there are some files in the `/etc/config/` directory, they will be deleted.
Use the `path` field to specify the desired file path for specific ConfigMap items.
In this case, the `special.level` item will be mounted in the `config-volume` volume at `/etc/config/keys`.
```yaml
apiVersion: v1
kind: Pod
metadata:
name: dapi-test-pod
spec:
containers:
- name: test-container
image: k8s.gcr.io/busybox
command: [ "/bin/sh","-c","cat /etc/config/keys" ]
volumeMounts:
- name: config-volume
mountPath: /etc/config
volumes:
- name: config-volume
configMap:
name: special-config
items:
- key: special.level
path: keys
restartPolicy: Never
{{< codenew file="pods/pod-configmap-volume-specific-key.yaml" >}}
Create the Pod:
```shell
kubectl create -f https://k8s.io/examples/pods/pod-configmap-volume-specific-key.yaml
```
When the pod runs, the command (`"cat /etc/config/keys"`) produces the output below:
When the pod runs, the command `cat /etc/config/keys` produces the output below:
```shell
very
@@ -566,9 +494,7 @@ basis. The [Secrets](/docs/concepts/configuration/secret/#using-secrets-as-files
When a ConfigMap already being consumed in a volume is updated, projected keys are eventually updated as well. Kubelet is checking whether the mounted ConfigMap is fresh on every periodic sync. However, it is using its local ttl-based cache for getting the current value of the ConfigMap. As a result, the total delay from the moment when the ConfigMap is updated to the moment when new keys are projected to the pod can be as long as kubelet sync period + ttl of ConfigMaps cache in kubelet.
{{< note >}}
A container using a ConfigMap as a
[subPath](/docs/concepts/storage/volumes/#using-subpath) volume will not receive
ConfigMap updates.
A container using a ConfigMap as a [subPath](/docs/concepts/storage/volumes/#using-subpath) volume will not receive ConfigMap updates.
{{< /note >}}
{{% /capture %}}
@@ -611,14 +537,17 @@ data:
```shell
kubectl get events
```
The output is similar to this:
```
LASTSEEN FIRSTSEEN COUNT NAME KIND SUBOBJECT TYPE REASON SOURCE MESSAGE
0s 0s 1 dapi-test-pod Pod Warning InvalidEnvironmentVariableNames {kubelet, 127.0.0.1} Keys [1badkey, 2alsobad] from the EnvFrom configMap default/myconfig were skipped since they are considered invalid environment variable names.
```
- ConfigMaps reside in a specific [namespace](/docs/concepts/overview/working-with-objects/namespaces/). A ConfigMap can only be referenced by pods residing in the same namespace.
- Kubelet doesn't support the use of ConfigMaps for pods not found on the API server.
This includes pods created via the Kubelet's --manifest-url flag, --config flag, or the Kubelet REST API.
- Kubelet doesn't support the use of ConfigMaps for pods not found on the API server. This includes pods created via the Kubelet's `--manifest-url` flag, `--config` flag, or the Kubelet REST API.
{{< note >}}
These are not commonly-used ways to create pods.
@@ -632,3 +561,4 @@ data:
{{% /capture %}}
`