openvidu-deployment: AWS - wait for the Elastic IP before deriving the domain

NewEIP was created with InstanceId, so the Elastic IP was attached only
after the instance existed, racing with the boot scripts: the domain could
be derived from whatever public IP the instance had at that moment (the
subnet's ephemeral one, or none), and with no public IP there was no
Internet access for apt-get, cfn-init or the installer either.

In the CE single node, Pro single node and Pro elastic templates, NewEIP is
now allocated on its own and attached by a separate NewEIPAssociation, so
its address is known up front. UserData waits up to 10 minutes for the
instance to have that address before doing anything else, and install.sh
reads public-ipv4 instead of public-hostname (empty in VPCs without DNS
hostnames).


Assisted-by: claude-code - Anthropic - Claude Opus 5.5

openvidu-deployment/community/singlenode/aws/cf-openvidu-singlenode.yaml

@@ -706,8 +706,7 @@ Resources:
 
                 # Configure Domain
                 if [[ "${DomainName}" == '' ]]; then
-                  PublicHostname=$(curl -s -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/public-hostname)
+                  DOMAIN=$(curl -s -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/public-ipv4)
-                  DOMAIN=$(echo "$PublicHostname" | cut -d'.' -f1 | sed 's/^ec2-//' | tr '-' '.')
                 else
                   DOMAIN=${DomainName}
                 fi
@@ -1100,10 +1099,28 @@ Resources:
         - Key: Name
           Value: !Ref 'AWS::StackName'
       UserData:
-        Fn::Base64: !Sub |
+        Fn::Base64: !Sub
+          - |
             #!/bin/bash -x
             set -eu -o pipefail
 
+            # Wait for the Elastic IP: CloudFormation associates it only after the instance
+            # is created, and until then the instance may have another public IP (or none,
+            # and no Internet access)
+            TOKEN=$(curl -s -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600")
+            CURRENT_PUBLIC_IP=""
+            for _ in $(seq 1 120); do
+              CURRENT_PUBLIC_IP=$(curl -sf -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/public-ipv4 || true)
+              if [[ "$CURRENT_PUBLIC_IP" == "${ExpectedPublicIp}" ]]; then
+                break
+              fi
+              sleep 5
+            done
+            if [[ "$CURRENT_PUBLIC_IP" != "${ExpectedPublicIp}" ]]; then
+              echo "[OpenVidu] Elastic IP ${ExpectedPublicIp} not attached after 10 minutes"
+              exit 1
+            fi
+
             echo "DPkg::Lock::Timeout \"-1\";" > /etc/apt/apt.conf.d/99timeout
 
             apt-get update && apt-get install -y \
@@ -1143,6 +1160,7 @@ Resources:
 
             # sending the finish call
             cfn-signal -e $? --stack ${AWS::StackId} --resource WaitCondition --region ${AWS::Region}
+          - ExpectedPublicIp: !If [PublicElasticIPPresent, !Ref PublicElasticIP, !Ref NewEIP]
 
       BlockDeviceMappings:
         - DeviceName: /dev/sda1
@@ -1161,8 +1179,13 @@ Resources:
   NewEIP:
     Type: 'AWS::EC2::EIP'
     Condition: PublicElasticIPAbsent
+
+  NewEIPAssociation:
+    Type: 'AWS::EC2::EIPAssociation'
+    Condition: PublicElasticIPAbsent
     Properties:
       InstanceId: !Ref OpenviduServer
+      AllocationId: !GetAtt NewEIP.AllocationId
 
   IMDSv2LaunchTemplate:
     Type: AWS::EC2::LaunchTemplate

openvidu-deployment/pro/elastic/aws/cf-openvidu-elastic.yaml

@@ -1410,8 +1410,13 @@ Resources:
   NewEIP:
     Type: 'AWS::EC2::EIP'
     Condition: PublicElasticIPAbsent
+
+  NewEIPAssociation:
+    Type: 'AWS::EC2::EIPAssociation'
+    Condition: PublicElasticIPAbsent
     Properties:
       InstanceId: !Ref OpenViduMasterNode
+      AllocationId: !GetAtt NewEIP.AllocationId
 
   IMDSv2LaunchTemplateMasterNode:
     Type: AWS::EC2::LaunchTemplate
@@ -1469,8 +1474,7 @@ Resources:
 
                 # Configure Domain and other parameters
                 if [[ "${DomainName}" == '' ]]; then
-                  PublicHostname=$(curl -s -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/public-hostname)
+                  DOMAIN=$(curl -s -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/public-ipv4)
-                  DOMAIN=$(echo "$PublicHostname" | cut -d'.' -f1 | sed 's/^ec2-//' | tr '-' '.')
                 else
                   DOMAIN=${DomainName}
                 fi
@@ -1940,10 +1944,28 @@ Resources:
         - Key: Name
           Value: !Sub ${AWS::StackName} - OpenVidu Elastic - Master Node
       UserData:
-        Fn::Base64: !Sub |
+        Fn::Base64: !Sub
+          - |
             #!/bin/bash
             set -eu -o pipefail
 
+            # Wait for the Elastic IP: CloudFormation associates it only after the instance
+            # is created, and until then the instance may have another public IP (or none,
+            # and no Internet access)
+            TOKEN=$(curl -s -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600")
+            CURRENT_PUBLIC_IP=""
+            for _ in $(seq 1 120); do
+              CURRENT_PUBLIC_IP=$(curl -sf -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/public-ipv4 || true)
+              if [[ "$CURRENT_PUBLIC_IP" == "${ExpectedPublicIp}" ]]; then
+                break
+              fi
+              sleep 5
+            done
+            if [[ "$CURRENT_PUBLIC_IP" != "${ExpectedPublicIp}" ]]; then
+              echo "[OpenVidu] Elastic IP ${ExpectedPublicIp} not attached after 10 minutes"
+              exit 1
+            fi
+
             echo "DPkg::Lock::Timeout \"-1\";" > /etc/apt/apt.conf.d/99timeout
 
             apt-get update && apt-get install -y \
@@ -2005,6 +2027,7 @@ Resources:
 
             # sending the finish call
             cfn-signal -e $? --stack ${AWS::StackId} --resource WaitCondition --region ${AWS::Region}
+          - ExpectedPublicIp: !If [PublicElasticIPPresent, !Ref PublicElasticIP, !Ref NewEIP]
 
       BlockDeviceMappings:
         - DeviceName: /dev/sda1

openvidu-deployment/pro/singlenode/aws/cf-openvidu-singlenode.yaml

@@ -808,8 +808,7 @@ Resources:
 
                 # Configure Domain
                 if [[ "${DomainName}" == '' ]]; then
-                  PublicHostname=$(curl -s -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/public-hostname)
+                  DOMAIN=$(curl -s -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/public-ipv4)
-                  DOMAIN=$(echo "$PublicHostname" | cut -d'.' -f1 | sed 's/^ec2-//' | tr '-' '.')
                 else
                   DOMAIN=${DomainName}
                 fi
@@ -1217,10 +1216,28 @@ Resources:
         - Key: Name
           Value: !Ref 'AWS::StackName'
       UserData:
-        Fn::Base64: !Sub |
+        Fn::Base64: !Sub
+          - |
             #!/bin/bash -x
             set -eu -o pipefail
 
+            # Wait for the Elastic IP: CloudFormation associates it only after the instance
+            # is created, and until then the instance may have another public IP (or none,
+            # and no Internet access)
+            TOKEN=$(curl -s -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600")
+            CURRENT_PUBLIC_IP=""
+            for _ in $(seq 1 120); do
+              CURRENT_PUBLIC_IP=$(curl -sf -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/meta-data/public-ipv4 || true)
+              if [[ "$CURRENT_PUBLIC_IP" == "${ExpectedPublicIp}" ]]; then
+                break
+              fi
+              sleep 5
+            done
+            if [[ "$CURRENT_PUBLIC_IP" != "${ExpectedPublicIp}" ]]; then
+              echo "[OpenVidu] Elastic IP ${ExpectedPublicIp} not attached after 10 minutes"
+              exit 1
+            fi
+
             echo "DPkg::Lock::Timeout \"-1\";" > /etc/apt/apt.conf.d/99timeout
 
             apt-get update && apt-get install -y \
@@ -1260,6 +1277,7 @@ Resources:
 
             # sending the finish call
             cfn-signal -e $? --stack ${AWS::StackId} --resource WaitCondition --region ${AWS::Region}
+          - ExpectedPublicIp: !If [PublicElasticIPPresent, !Ref PublicElasticIP, !Ref NewEIP]
 
       BlockDeviceMappings:
         - DeviceName: /dev/sda1
@@ -1278,8 +1296,13 @@ Resources:
   NewEIP:
     Type: 'AWS::EC2::EIP'
     Condition: PublicElasticIPAbsent
+
+  NewEIPAssociation:
+    Type: 'AWS::EC2::EIPAssociation'
+    Condition: PublicElasticIPAbsent
     Properties:
       InstanceId: !Ref OpenviduServer
+      AllocationId: !GetAtt NewEIP.AllocationId
 
   IMDSv2LaunchTemplate:
     Type: AWS::EC2::LaunchTemplate