I am using a cloudformation template to create my EC2 instance. In userdata section i need to run a shell file that i have created in metadata. For that shell file i am passing private ip of the instance as a parameter. To get the private ip i am using this :
{
"Fn::GetAtt" : [ "ConsoleServer", "PrivateIp" ]
},
i ask the wait handler to wait while my user data gets executed but the wait handeler is dependent on the EC2 that i am trying to configure.
This is causing cicular dependency but i am unable to understand how to get private ip of the instance using some other way ?
Below are the part that matter : Metadata
"Resources": {
"ConsoleServer": {
"Type": "AWS::EC2::Instance",
"Metadata": {
"AWS::CloudFormation::Init": {
"config": {
"files": {
"/usr/local/share/deployment-script.sh": {
"mode": "755",
"owner": "ec2-user",
"group": "ec2-user",
"content": {
"Fn::Join": [
"",
[
"#!/bin/bash\n",
"sh master.sh ",
{
"Ref": "S3ConsoleZip"
}, " ",
{
"Fn::GetAtt" : [ "ConsoleServer", "PrivateIp" ]
},
and this is my userdata section followed by waithandler
"UserData": {
"Fn::Base64": {
"Fn::Join": [
"",
[
"#!/bin/bash -v\n",
"sudo su",
"\n",
"chmod -R 775 /usr/local/share\n",
"yum update -y aws-cfn-bootstrap\n",
"## Error reporting helper function\n",
"function error_exit\n",
"{\n",
" /opt/aws/bin/cfn-signal -e 1 -r \"$1\" '",
{
"Ref": "WaitHandleServer"
},
"'\n",
" exit 1\n",
"}\n",
"## Initialize CloudFormation bits\n",
"/opt/aws/bin/cfn-init -v -s ",
{
"Ref": "AWS::StackName"
},
" -r ConsoleServer",
" --region ",
{
"Ref": "AWS::Region"
},
" > /tmp/cfn-init.log 2>&1 || error_exit $(</tmp/cfn-init.log)\n",
"cd /usr/local/share\n",
********* "sh deployment-script.sh >> /home/ec2-user/deployment-script.log\n",
"/opt/aws/bin/cfn-signal",
" -e 0",
" '",
{
"Ref": "WaitHandleServer"
},
"'",
"\n",
"date > /home/ec2-user/stoptime"
]
]
}
}
}
},
"WaitHandleServer": {
"Type": "AWS::CloudFormation::WaitConditionHandle"
},
"WaitConditionServer": {
"Type": "AWS::CloudFormation::WaitCondition",
"DependsOn": "ConsoleServer",
"Properties": {
"Handle": {
"Ref": "WaitHandleServer"
},
"Timeout": "1200"
}
}
},
i have added ********* where call is being made from user data section
