How to format CloudFormation Task Definition command
Question
Hi I currently have a Task Definition resource as such:
WebServerTaskDefinition:
Type: AWS::ECS::TaskDefinition
Properties:
Family: !Ref TaskDefinitionName
NetworkMode: awsvpc
RequiresCompatibilities:
- FARGATE
Cpu: !Ref TaskDefinitionCPU
Memory: !Ref TaskDefinitionMemory
ExecutionRoleArn: !Ref TaskDefinitionExecutionRole
ContainerDefinitions:
- Name: !Ref ContainerName
Image: !Ref ContainerImage
Essential: true
Cpu: 256
EntryPoint: sh,-c
Command:
PortMappings:
- ContainerPort: !Ref ContainerPort
I would like to define ContainerDefinitions Command as
/bin/sh -c "echo '<html> <head> <title>Amazon ECS Sample App</title> <style>body {margin-top: 40px; background-color: #333;} </style> </head><body> <div style=color:white;text-align:center> <h1>Amazon ECS Sample App</h1> <h2>Congratulations!</h2> <p>Your application is now running on a container in Amazon ECS.</p> </div></body></html>' > /usr/local/apache2/htdocs/index.html && httpd-foreground"
Any suggestions how to put it into yaml? I am getting Template Format Error if I put place the command directly in the template
2 answers
solution1
3 ACCPTED 2020-07-24 10:20:39
The command should be a string according to cloudformation. In YAML sytax, Quotes are required when the string contains special or reserved characters.
Strings containing any of the following characters must be quoted. Although you can use double quotes, for these characters it is more convenient to use single quotes, which avoids having to escape any backslash: :, {, }, [, ], ,, &, *, #, ?, |, -, <, >, =, ,, %, @, `
you can read more about when to use the quotes in strings in the YAML documentation
So In your case, you can escape the quotes like this.
WebServerTaskDefinition:
Type: AWS::ECS::TaskDefinition
Properties:
Family: !Ref TaskDefinitionName
NetworkMode: awsvpc
RequiresCompatibilities:
- FARGATE
Cpu: !Ref TaskDefinitionCPU
Memory: !Ref TaskDefinitionMemory
ExecutionRoleArn: !Ref TaskDefinitionExecutionRole
ContainerDefinitions:
- Name: !Ref ContainerName
Command:
- "/bin/sh -c \"echo '<html> <head> <title>Amazon ECS Sample App</title> <style>body {margin-top: 40px; background-color: #333;} </style> </head><body> <div style=color:white;text-align:center> <h1>Amazon ECS Sample App</h1> <h2>Congratulations!</h2> <p>Your application is now running on a container in Amazon ECS.</p> </div></body></html>' > /usr/local/apache2/htdocs/index.html && httpd-foreground\""
solution2
1 2020-07-26 13:17:56
See https://yaml-multiline.info/ .
In this case the best would be using |- . For example:
example: |-\n
··Several lines of text,\n
··with some "quotes" of various 'types',\n
··and also a blank line:\n
··\n
··plus another line at the end.\n
··\n
··\n
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