Serverless App Engine:Manage a Kubernetes ConfigMap

Create a ConfigMap

1. Log on to the SAE console.
2. In the left-side navigation pane, click Namespaces. In the top navigation bar, select a region. Then, click the name of a namespace.
3. In the left-side navigation pane, click ConfigMaps. On the ConfigMaps page, click Create.
4. In the Create ConfigMap panel, select one of the following methods to create a ConfigMap. Then, click OK.
   • Manual creation: On the Manual tab, configure the parameters. The following table describes the parameters.

     Parameter	Description
     ConfigMap Name	Enter a name for the ConfigMap.
     ConfigMap Description	Enter a description for the ConfigMap.
     Configure Mappings	A key can contain up to 250 characters in length. A value can contain up to 10,000 characters in length. You can specify up to 20 key-value pairs for a ConfigMap.

   • Use a file: Click the File tab and configure the parameters. The following table describes the parameters.

     Parameter	Description
     ConfigMap Name	Enter a name for the ConfigMap.
     Configuration Format	Select JSON or YAML.
     Configuration Content	Sample JSON file: { "env.shell": "/bin/sh", "nginx.conf": "daemon off;\nworker_processes 2;\nuser www-data;\n\nevents {\n use epoll;\n worker_connections 128;\n}\n\nerror_log logs/error.log info;\n\nhttp {\n server_tokens off;\n include mime.types;\n charset utf-8;\n\n access_log logs/access.log combined;\n\n server {\n server_name localhost;\n listen 127.0.0.1:80;\n\n error_page 500 502 503 504 /50x.html;\n\n location / {\n root html;\n }\n\n }\n\n}" } Sample YAML file: env.shell: /bin/sh nginx.conf: | daemon off; worker_processes 2; user www-data; events { use epoll; worker_connections 128; } error_log logs/error.log info; http { server_tokens off; include mime.types; charset utf-8; access_log logs/access.log combined; server { server_name localhost; listen 127.0.0.1:80; error_page 500 502 503 504 /50x.html; location / { root html; } } } Note The content of the Kubernetes ConfigMap Manifest file. The configuration content can be in the JSON or YAML format. Only the UTF-8 encoding format is supported for Chinese characters. The size of the file cannot exceed 512 KB.

   The created ConfigMap is displayed on the ConfigMaps page. You can click Edit, Copy, or Delete in the Actions column to manage the ConfigMap.

   Note

   • Each time a ConfigMap is modified, a new version is generated for the ConfigMap. The new version takes effect only for new instances that are generated by manual scaling or auto scaling after the modification is performed. The new version does not take effect for existing instances. To ensure that all instances of an application use the same version of a ConfigMap, you must manually restart or redeploy the application after you modify the ConfigMap.
   • If you delete a ConfigMap, the associated applications cannot run as expected. Before you delete the ConfigMap, you must disassociate the ConfigMap from the applications.

Inject configurations

Inject configurations when you create an application

1. Log on to the SAE console.
2. In the left-side navigation pane, click Applications. In the top navigation bar, select a region. Then, click Create Application.
3. In the Basic Information step, configure the parameters and click Next: Application Deployment Configurations.
4. In the Deployment Configurations step, configure the Technology Stack Programming Language and Application Deployment Method parameters and the corresponding settings.
5. In the Configuration Management section, select the ConfigMap from the ConfigMap Name drop-down list and a key from the Key drop-down list. Then, specify the path on which the ConfigMap is mounted in the Mount Path field.
   

   Note

   • You can create a ConfigMap in the Namespaces module. You can also click Create ConfigMap (K8s configmap) in the Environment Variable Settings section to create a ConfigMap. Then, configure the parameters in the Create ConfigMap panel.
   • You can mount all keys of a ConfigMap. To mount all keys of the ConfigMap on the specified path, select All from the Key drop-down list.
6. Optional: To reference other ConfigMaps, click Add and repeat the previous step.
7. Click Next: Confirm Specifications.
8. In the Specification Confirmation step, view the details of the application and the fee for the selected specifications. Then, click Confirm.
   The Creation Completed step appears. You can click Application Details to go to the Basic Information page of the application.
9. Check whether the configurations have taken effect.
   • Method 1:

     In the left-side navigation pane of the Basic Information page, click Change Records. On the Change Records page, view the change details. If Executed is displayed in the Change Status column, the application is deployed and the configurations have taken effect.

   • Method 2:

     On the Basic Information page, click the Instance Deployment Information tab to view the Status of the instances. If Running is displayed in the Status column, the application is deployed and the configurations have taken effect.

Inject configurations when you deploy an application

1. Log on to the SAE console.
2. In the left-side navigation pane, click Applications. In the top navigation bar, select a region. Then, click the name of an application.
3. In the upper-right corner of the Basic Information page, click Deploy Application.
4. In the Configuration Management section, select the ConfigMap from the ConfigMap Name drop-down list and a key from the Key drop-down list. Then, specify the path on which the ConfigMap is mounted in the Mount Path field.
   

   Note

   • You can create a ConfigMap in the Namespaces module. You can also click Create ConfigMap (K8s configmap) in the Environment Variable Settings section to create a ConfigMap. Then, configure the parameters in the Create ConfigMap panel.
   • You can mount all keys of a ConfigMap. To mount all keys of the ConfigMap on the specified path, select All from the Key drop-down list.
5. After you configure the settings, click Confirm.
6. Check whether the configurations have taken effect.
   • Method 1:

     In the left-side navigation pane of the Basic Information page, click Change Records. On the Change Records page, view the change details. If Executed is displayed in the Change Status column, the application is deployed and the configurations have taken effect.

   • Method 2:

     On the Basic Information page, click the Instance Deployment Information tab to view the Status of the instances. If Running is displayed in the Status column, the application is deployed and the configurations have taken effect.

Use a ConfigMap as a set of environment variables

You can specify a ConfigMap that includes a set of environment variables for a container in a runtime environment. This way, you can flexibly modify the configuration of the container after applications are deployed. This section describes how to use a ConfigMap that includes a set of environment variables when you create an application.

1. Log on to the SAE console.
2. In the left-side navigation pane, click Applications. In the top navigation bar, select a region. Then, click Create Application.
3. In the Basic Information step, configure the parameters and click Next: Application Deployment Configurations.
4. In the Deployment Configurations step, configure the required parameters and expand the Environment Variable Settings section.
5. In the Environment Variable Settings section, select Reference ConfigMap from the Type drop-down list and configure the Variable Name parameter. Then, select the name of the ConfigMap that you created and a key of the ConfigMap from the Variable Value/Variable Reference drop-down list.
   

   Note You can create a ConfigMap on the Namespace page. You can also click Create ConfigMap (K8s configmap) in the Environment Variable Settings section, and then create a ConfigMap in the Create ConfigMap panel.
6. Optional: To reference other ConfigMaps, click Add and repeat the previous step.
7. Click Next: Confirm Specifications.
8. In the Specification Confirmation step, view the details of the application and the fee for the selected specifications. Then, click Confirm.
   The Creation Completed step appears. You can click Application Details to go to the Basic Information page of the application.

Best practices

Manually configure a php-fpm.conf file for a PHP application

1. Create a ConfigMap. For more information, see Create a ConfigMap.
   

   Parameter	Description
   Method	Select Manual.
   ConfigMap Name	Enter a name for the ConfigMap. Example: php-fpm.
   ConfigMap Description	Enter a description for the ConfigMap. Example: www.conf.
   Configure Mappings	Key www.conf Value [www] user = www-data group = www-data listen = 127.0.0.1:9000 pm = dynamic pm.max_children = 5 pm.start_servers = 2 pm.min_spare_servers = 1 pm.max_spare_servers = 3

2. Inject configurations. For more information, see Inject configurations.
   

   Parameter	Description
   ConfigMap Name	Select the php-fpm ConfigMap that you created.
   Key	Select the www.conf key that you created.
   Mount Path	Enter the following path: /usr/local/etc/php-fpm.d/www.conf