For increased flexibility, you can add expressions to cloud template code in Automation Assembler.
How expressions work
Automation Assembler expressions use the ${expression} construct, as shown in the following examples.
The following code samples are pruned to show only the important lines. The entire, unedited cloud template appears at the end.
Examples
At deployment time, allow the user to paste in the encrypted key needed for remote access:
inputs: sshKey: type: string maxLength: 500 resources: frontend: type: Cloud.Machine properties: remoteAccess: authentication: publicPrivateKey sshKey: '${input.sshKey}'
For deploying to VMware Cloud on AWS, set the folder name to the required name of Workload:
inputs: environment: type: string enum: - AWS - vSphere - Azure - VMC - GCP default: vSphere resources: frontend: type: Cloud.Machine properties: folderName: '${input.environment == "VMC" ? "Workload" : ""}'
At deployment time, tag the machine with an all-lowercase env tag that matches the selected environment:
inputs: environment: type: string enum: - AWS - vSphere - Azure - VMC - GCP default: vSphere resources: frontend: type: Cloud.Machine properties: constraints: - tag: '${"env:" + to_lower(input.environment)}'
Set the number of machines in the front-end cluster to one (small) or two (large). Note that the large cluster is set by process of elimination:
inputs: envsize: type: string enum: - Small - Large resources: frontend: type: Cloud.Machine properties: count: '${input.envsize == "Small" ? 1 : 2}'
Attach machines to the same Default network by binding to the property found in the network resource:
resources: frontend: type: Cloud.Machine properties: networks: - network: '${resource.Cloud_Network_1.name}' apitier: type: Cloud.Machine properties: networks: - network: '${resource.Cloud_Network_1.name}' Cloud_Network_1: type: Cloud.Network properties: name: Default networkType: existing
Encrypt access credentials submitted to the API:
resources: apitier: type: Cloud.Machine properties: cloudConfig: | #cloud-config runcmd: - export apikey=${base64_encode(input.username:input.password)} - curl -i -H 'Accept:application/json' -H 'Authorization:Basic :$apikey' http://example.com
Discover the address of the API machine:
resources: frontend: type: Cloud.Machine properties: cloudConfig: | runcmd: - echo ${resource.apitier.networks[0].address} apitier: type: Cloud.Machine properties: networks: - network: '${resource.Cloud_Network_1.name}'
Complete cloud template
inputs: environment: type: string enum: - AWS - vSphere - Azure - VMC - GCP default: vSphere sshKey: type: string maxLength: 500 envsize: type: string enum: - Small - Large resources: frontend: type: Cloud.Machine properties: folderName: '${input.environment == "VMC" ? "Workload" : ""}' image: ubuntu flavor: medium count: '${input.envsize == "Small" ? 1 : 2}' remoteAccess: authentication: publicPrivateKey sshKey: '${input.sshKey}' cloudConfig: | packages: - nginx runcmd: - echo ${resource.apitier.networks[0].address} constraints: - tag: '${"env:" + to_lower(input.environment)}' networks: - network: '${resource.Cloud_Network_1.name}' apitier: type: Cloud.Machine properties: folderName: '${input.environment == "VMC" ? "Workload" : ""}' image: ubuntu flavor: small cloudConfig: | #cloud-config runcmd: - export apikey=${base64_encode(input.username:input.password)} - curl -i -H 'Accept:application/json' -H 'Authorization:Basic :$apikey' http://example.com remoteAccess: authentication: publicPrivateKey sshKey: '${input.sshKey}' constraints: - tag: '${"env:" + to_lower(input.environment)}' networks: - network: '${resource.Cloud_Network_1.name}' Cloud_Network_1: type: Cloud.Network properties: name: Default networkType: existing constraints: - tag: '${"env:" + to_lower(input.environment)}'