15.3. Creating a config map

You can use the following command to create a config map from directories, specific files, or literal values.

Procedure

  • Create a config map: 

    $ oc create configmap <configmap_name> [options]

15.3.1. Creating a config map from a directory

You can create a config map from a directory. This method allows you to use multiple files within a directory to create a config map.

Procedure

The following example procedure outlines how to create a config map from a directory.

  1. Start with a directory with some files that already contain the data with which you want to populate a config map: 

    $ ls example-files

    Example output

    game.properties
ui.properties

    $ cat example-files/game.properties

    Example output

    enemies=aliens
lives=3
enemies.cheat=true
enemies.cheat.level=noGoodRotten
secret.code.passphrase=UUDDLRLRBABAS
secret.code.allowed=true
secret.code.lives=30

    $ cat example-files/ui.properties

    Example output

    color.good=purple
color.bad=yellow
allow.textmode=true
how.nice.to.look=fairlyNice

  2. Create a ConfigMap holding the content of each file in this directory by entering the following command: 

    $ oc create configmap game-config \
    --from-file=example-files/

    When the --from-file option points to a directory, each file directly in that directory is used to populate a key in the ConfigMap, where the name of the key is the file name, and the value of the key is the content of the file.

    For example, the previous command creates the following ConfigMap: 

    $ oc describe configmaps game-config

    Example output

    Name:           game-config
Namespace:      default
Labels:         <none>
Annotations:    <none>

Data

game.properties:        158 bytes
ui.properties:          83 bytes

    You can see that the two keys in the map are created from the file names in the directory specified in the command. Because the content of those keys might be large, the output of oc describe only shows the names of the keys and their sizes.

  3. Enter the oc get command for the object with the -o option to see the values of the keys: 

    $ oc get configmaps game-config -o yaml

    Example output

    apiVersion: v1
data:
  game.properties: |-
    enemies=aliens
    lives=3
    enemies.cheat=true
    enemies.cheat.level=noGoodRotten
    secret.code.passphrase=UUDDLRLRBABAS
    secret.code.allowed=true
    secret.code.lives=30
  ui.properties: |
    color.good=purple
    color.bad=yellow
    allow.textmode=true
    how.nice.to.look=fairlyNice
kind: ConfigMap
metadata:
  creationTimestamp: 2016-02-18T18:34:05Z
  name: game-config
  namespace: default
  resourceVersion: "407"-
  selflink: /api/v1/namespaces/default/configmaps/game-config
  uid: 30944725-d66e-11e5-8cd0-68f728db1985

15.3.2. Creating a ConfigMap from a file

You can create a config map from a file.

Procedure

The following example procedure outlines how to create a config map from a file.

注意

If you create a config map from a file, you can include files containing non-UTF8 data that are placed in this field without corrupting the non-UTF8 data. OpenShift Container Platform detects binary files and transparently encodes the file as MIME. On the server, the MIME payload is decoded and stored without corrupting the data.

You can pass the --from-file option multiple times to the CLI. The following example yields equivalent results to the creating from directories example.

  1. Create a ConfigMap specifying a specific file: 

    $ oc create configmap game-config-2 \
    --from-file=example-files/game.properties \
    --from-file=example-files/ui.properties

  2. Verify the results: 

    $ oc get configmaps game-config-2 -o yaml

    Example output

    apiVersion: v1
data:
  game.properties: |-
    enemies=aliens
    lives=3
    enemies.cheat=true
    enemies.cheat.level=noGoodRotten
    secret.code.passphrase=UUDDLRLRBABAS
    secret.code.allowed=true
    secret.code.lives=30
  ui.properties: |
    color.good=purple
    color.bad=yellow
    allow.textmode=true
    how.nice.to.look=fairlyNice
kind: ConfigMap
metadata:
  creationTimestamp: 2016-02-18T18:52:05Z
  name: game-config-2
  namespace: default
  resourceVersion: "516"
  selflink: /api/v1/namespaces/default/configmaps/game-config-2
  uid: b4952dc3-d670-11e5-8cd0-68f728db1985

You can specify the key to set in a ConfigMap for content imported from a file. This can be set by passing a key=value expression to the --from-file option. For example:

  1. Create a ConfigMap specifying a key-value pair: 

    $ oc create configmap game-config-3 \
    --from-file=game-special-key=example-files/game.properties

  2. Verify the results: 

    $ oc get configmaps game-config-3 -o yaml

    Example output

    apiVersion: v1
data:
  game-special-key: |- 1
    enemies=aliens
    lives=3
    enemies.cheat=true
    enemies.cheat.level=noGoodRotten
    secret.code.passphrase=UUDDLRLRBABAS
    secret.code.allowed=true
    secret.code.lives=30
kind: ConfigMap
metadata:
  creationTimestamp: 2016-02-18T18:54:22Z
  name: game-config-3
  namespace: default
  resourceVersion: "530"
  selflink: /api/v1/namespaces/default/configmaps/game-config-3
  uid: 05f8da22-d671-11e5-8cd0-68f728db1985

    1
    This is the key that you set in the preceding step.

15.3.3. Creating a config map from literal values

You can supply literal values for a config map.

Procedure

The --from-literal option takes a key=value syntax that allows literal values to be supplied directly on the command line.

  1. Create a ConfigMap specifying a literal value: 

    $ oc create configmap special-config \
    --from-literal=special.how=very \
    --from-literal=special.type=charm

  2. Verify the results: 

    $ oc get configmaps special-config -o yaml

    Example output

    apiVersion: v1
data:
  special.how: very
  special.type: charm
kind: ConfigMap
metadata:
  creationTimestamp: 2016-02-18T19:14:38Z
  name: special-config
  namespace: default
  resourceVersion: "651"
  selflink: /api/v1/namespaces/default/configmaps/special-config
  uid: dadce046-d673-11e5-8cd0-68f728db1985