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The error "permission denied (public key)" typically occurs when there are issues with the SSH key authentication process. Here are some steps to troubleshoot and resolve this issue: 1. **Verify SSH Key Exists**: First, ensure that the SSH key pair you are using exists on your local machine. By default, these are usually found in `~/.ssh/id_rsa` (private key) and `~/.ssh/id_rsa.pub` (public key). ```bash ls -al ~/.ssh ``` Check if `id_rsa` (private key) and `id_rsa.pub` (public key) files are present. 2. **Check SSH Agent**: Make sure your SSH agent is running and has the key loaded. You can use `ssh-add` to add your SSH key to the agent. ```bash ssh-add ~/.ssh/id_rsa ``` If you get an error like "Could not open a connection to your authentication agent," start the SSH agent first: ```bash eval "$(ssh-agent -s)" ``` Then add your key again. 3. **Permissions on Remote Server**: - Ensure that the `authorized_keys` file on the remote server has correct permissions. SSH requires strict permissions for security reasons. ```bash chmod 600 ~/.ssh/authorized_keys chmod 700 ~/.ssh ``` 4. **Copy the Public Key**: - If you haven't already, copy the public key (`id_rsa.pub`) to the `authorized_keys` file on the slave node. You can do this manually or use `ssh-copy-id` command: ```bash ssh-copy-id user@slave_node ``` Replace `user` with your username on the slave node and `slave_node` with the hostname or IP address of the slave node. 5. **Check SSH Configuration on Slave Node**: - Make sure that SSH is configured to allow public key authentication on the slave node. Open `/etc/ssh/sshd_config` file and ensure `PubkeyAuthentication` is set to `yes`. ```bash PubkeyAuthentication yes ``` 6. **Restart SSH Service**: After making changes to SSH configuration files (`sshd_config`) on the slave node, restart the SSH service for changes to take effect. ```bash sudo systemctl restart ssh ``` 7. **Debugging**: If the issue persists, you can try connecting to the slave node with verbose output enabled to get more detailed error messages: ```bash ssh -v user@slave_node ``` This will show you the debug output and might give clues about what is going wrong. By following these steps, you should be able to diagnose and fix the "permission denied (public key)" error when copying SSH keys to the slave node.

Taint will not schedule anything to that node but node affinity can be scheduled but not execute the application that have been deployed.. 😅just my understanding

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