What is wait condition?
What is wait condition?
A wait condition requires a wait condition handle to set up a presigned URL that is used as the signaling mechanism. The presigned URL enables you to send a signal without having to supply your AWS credentials.
What is CloudFormation wait condition?
Wait Conditions, as the name suggests, is a tool used to control the order of creation of the AWS resources in a CloudFormation stack. It can pause the creation of a stack and wait for a signal to ensure that specific resources and configurations were properly launched before resuming the stack creation process.
Which situations should the WaitCondition be applied to?
You can use a wait condition for situations like the following:
- To coordinate stack resource creation with configuration actions that are external to the stack creation.
- To track the status of a configuration process.
What is AWS :: CloudFormation :: Waitconditionhandle?
An associated AWS::CloudFormation::WaitCondition resource checks the URL for the required number of success signals or for a failure signal.
What is a wait condition and how does it work?
The wait condition’s Count property specifies the number of success signals. If none is set, the default is 1. A wait condition requires a wait condition handle to set up a presigned URL that is used as the signaling mechanism. The presigned URL enables you to send a signal without having to supply your AWS credentials.
What is the maximum time that I can specify for wait conditions?
The maximum time that you can specify is 43200 seconds (12 hours ). Typically, you want a wait condition to begin immediately after the creation of a specific resource, such as an Amazon EC2 instance, RDS DB instance, or Auto Scaling group. You do this by adding the DependsOn attribute to a wait condition.
What is the UniqueID value for a wait condition?
If you have a Count that is greater than 1, the UniqueId value for each signal must be unique across all signals sent to a particular wait condition. The UniqueId is an arbitrary alphanumerical string. A Curl command is one way to send a signal. The following example shows a Curl command line that signals success to a wait condition.
How do I use the dependson attribute in a wait condition?
When you add a DependsOn attribute to a wait condition, you specify that the wait condition is created only after the creation of a particular resource has completed. When the wait condition is created, AWS CloudFormation begins the timeout period and waits for success signals. You can also use the DependsOn attribute on other resources.