azure is awfully particular for certain strings

.travis.yml

@@ -24,6 +24,7 @@ deploy:
       repo: 10thmagnitude/terraform
       branch: topic-101-vm-simple-linux
 
+# TODO: possibly use Azure CLI to delete the resource group
 after_deploy:
   - provider: script
     script: terraform destroy

examples/azure-vm-simple-linux/deploy.sh

@@ -3,10 +3,10 @@
 set -o errexit -o nounset
 
 # generate a unique string for CI deployment
-KEY=$(cat /dev/urandom | tr -cd 'a-z' | head -c 8)
-KEY+=$(cat /dev/urandom | tr -cd 'A-Z' | head -c 4)
-KEY+=$(cat /dev/urandom | tr -cd '0-9' | head -c 4)
-PASSWORD=KEY+"#"
+KEY=$(cat /dev/urandom | tr -cd 'a-z' | head -c 12)
+PASSWORD=KEY
+PASSWORD+=$(cat /dev/urandom | tr -cd 'A-Z' | head -c 2)
+PASSWORD+=$(cat /dev/urandom | tr -cd '0-9' | head -c 2)
 
 terraform get