AWS::Lambda::Version 资源仅代表一个已发布的 Lambda 函数版本 - 它不会在每次更新代码时自动发布新版本。为此，您有两种选择：
1。自定义资源
您可以实现自己的Custom Resource，在每次更新时调用PublishVersion。
对于这种方法，您仍然需要在每次更新堆栈时更改至少一个参数，以触发自定义资源的更新，从而触发 PublishVersion 操作。 （不过，您不必实际更新模板。）
这是一个完整的工作示例：
Description: Publish a new version of a Lambda function whenever the code is updated.
Parameters:
Nonce:
Description: Change this string when code is updated.
Type: String
Default: "Test"
Resources:
MyCustomResource:
Type: Custom::Resource
Properties:
ServiceToken: !GetAtt MyFunction.Arn
Nonce: !Ref Nonce
MyFunction:
Type: AWS::Lambda::Function
Properties:
Handler: index.handler
Role: !GetAtt LambdaExecutionRole.Arn
Code:
ZipFile: !Sub |
var response = require('cfn-response');
exports.handler = function(event, context) {
return response.send(event, context, response.SUCCESS, {Result: '${Nonce}'});
};
Runtime: nodejs4.3
LambdaDeploy:
Type: Custom::LambdaVersion
Properties:
ServiceToken: !GetAtt LambdaDeployFunction.Arn
FunctionName: !Ref MyFunction
Nonce: !Ref Nonce
LambdaDeployFunction:
Type: AWS::Lambda::Function
Properties:
Handler: "index.handler"
Role: !GetAtt LambdaExecutionRole.Arn
Code:
ZipFile: !Sub |
var AWS = require('aws-sdk');
var response = require('cfn-response');
exports.handler = (event, context) => {
console.log("Request received:\n", JSON.stringify(event));
if (event.RequestType == 'Delete') {
return response.send(event, context, response.SUCCESS);
}
var lambda = new AWS.Lambda();
lambda.publishVersion({FunctionName: event.ResourceProperties.FunctionName}).promise().then((data) => {
return response.send(event, context, response.SUCCESS, {Version: data.Version}, data.FunctionArn);
}).catch((e) => {
return response.send(event, context, response.FAILED, e);
});
};
Runtime: nodejs4.3
LambdaExecutionRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal: {Service: [lambda.amazonaws.com]}
Action: ['sts:AssumeRole']
Path: /
ManagedPolicyArns:
- arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
Policies:
- PolicyName: PublishVersion
PolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Action: ['lambda:PublishVersion']
Resource: '*'
Outputs:
LambdaVersion:
Value: !GetAtt LambdaDeploy.Version
CustomResourceResult:
Value: !GetAtt MyCustomResource.Result
2。模板预处理器
您可以使用像embedded Ruby 这样的模板预处理器（或者只是在每次部署时手动更新您的模板），通过在每次更新代码时更改AWS::Lambda::Version 资源的Logical ID 来在每次更新代码时发布新版本.
例子：
# template.yml
Description: Publish a new version of a Lambda function whenever the code is updated.
<%nonce = rand 10000%>
Resources:
LambdaVersion<%=nonce%>:
Type: AWS::Lambda::Version
Properties:
FunctionName: !Ref MyFunction
MyCustomResource:
Type: Custom::Resource
Properties:
ServiceToken: !GetAtt MyFunction.Arn
Nonce: <%=nonce%>
MyFunction:
Type: AWS::Lambda::Function
Properties:
Handler: index.handler
Role: !GetAtt LambdaExecutionRole.Arn
Code:
ZipFile: !Sub |
var response = require('cfn-response');
exports.handler = function(event, context) {
return response.send(event, context, response.SUCCESS, {Result: '<%=nonce%>'});
};
Runtime: nodejs4.3
LambdaExecutionRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal: {Service: [lambda.amazonaws.com]}
Action: ['sts:AssumeRole']
Path: /
ManagedPolicyArns:
- arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
Outputs:
LambdaVersion:
Value: !GetAtt LambdaVersion<%=nonce%>.Version
CustomResourceResult:
Value: !GetAtt MyCustomResource.Result
要在通过erb 模板预处理器传递template.yml 时创建/更新堆栈，请运行：
aws cloudformation [create|update]-stack \
--stack-name [stack_name] \
--template-body file://<(ruby -rerb -e "puts ERB.new(ARGF.read).result" < template.yml) \
--capabilities CAPABILITY_IAM