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There could be several factors that might be causing the error "Timeout was reached before node joined." when trying to connect EC2 instance to localhost Docker Swarm cluster. Here are some of the steps that you can try:
Verify the Docker version and compatibility - Ensure that the Docker version installed on EC2 instance and localhost are compatible.
Verify the Docker swarm join command - Ensure that the correct command is being used to join the EC2 instance to the Docker Swarm cluster.
Check the network connectivity - Ensure that the EC2 instance and localhost can communicate over the network and the required ports are open.
Disable Docker's swarm mode - If you have initialized a swarm mode on your EC2 instance earlier, try disabling it and join the EC2 instance to the localhost Docker Swarm cluster.
Check for firewall restrictions - Ensure that there are no firewall restrictions that are blocking the communication between the EC2 instance and localhost.
Check for security groups - Ensure that the security groups for EC2 instance and localhost allow communication over the required ports.
Check the IP configuration - Ensure that the IP address of EC2 instance and localhost are correctly configured.
It is recommended to follow these steps and verify each point to resolve the issue. If these steps do not resolve the issue, please provide additional details or logs related to the error.
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