Launch Configuration Userdata shell scripts doesn't run from Cloudformation

Question

I'm trying to run shell scripts from User-data of Launch Configuration in AWS Cloudformation template. I created AMI with some script inside.

Here is example from Cloudformation template of LaunchConfiguration:

 "ProcessLC": {
        "Type" : "AWS::AutoScaling::LaunchConfiguration",
        "Properties" : {
            "ImageId": {"Ref" : "GeneralAMI"},
            "InstanceType" : "t2.medium",
            "SecurityGroups" : [{"Ref": "SecurityGroup"}],
            "KeyName" : {"Ref": "KeyPair"},
            "UserData": {"Fn::Base64": {"Fn::Join": ["", [
              {"Fn::Join": ["", ["Env=",{"Ref": "Env"}," \n"]]},
              {"Fn::Join": ["", ["DBConn=", {"Ref": "Database"}," \n"]]},
              {"Fn::Join": ["", ["DBEngine=", {"Ref": "Metabase"}," \n"]]},
              "#!/bin/bash\n",
              "cd /project/\n",
              "./stop.sh\n",
              "./vpcAssignIP.sh\n"
              ]
            ]
          }
        } 
      }
    }

It doesn't run(as I see in log "/var/log/cloud-init.log") when I creating stack. What I'm doing wrong?

Thanks!

Josh Edwards · Accepted Answer · 2016-02-01 17:54:02Z

3

Put this line at the top, instead of further down: "#!/bin/bash\n". That line tells it to process the entire script as bash commands. It has to be the first line. (So, in your join, if you put it in the "" instead of after the Join, you should be good.)

Edit: With your joins, this should work:

"UserData": {"Fn::Base64": {"Fn::Join": ["", [
              "#!/bin/bash\n",
              {"Fn::Join": ["", ["Env=",{"Ref": "Env"}," \n"]]},
              {"Fn::Join": ["", ["DBConn=", {"Ref": "Database"}," \n"]]},
              {"Fn::Join": ["", ["DBEngine=", {"Ref": "Metabase"}," \n"]]},
              "cd /project/\n",
              "./stop.sh\n",
              "./vpcAssignIP.sh\n"
              ]

edited Feb 1, 2016 at 17:54

answered Feb 1, 2016 at 14:40

Josh Edwards

9185 silver badges13 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

muzafarow Over a year ago

So if "fn::join" will be after bash script, they will not work, no?

Josh Edwards Over a year ago

You have to make your join output "#!/bin/bash\n" as the first line. Currently, your joins output that line as the 4th line. See my edit for a code snippet.

Collectives™ on Stack Overflow

Launch Configuration Userdata shell scripts doesn't run from Cloudformation

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related