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To connect from a controller host (where Ansible is installed) to another target host (EC2 instance), you can follow these general steps:

1. Install Ansible on the Controller Host: Make sure Ansible is installed on your controller host. You can install it using a package manager like apt, yum, or dnf depending on your operating system.

   Example for Ubuntu:

   sudo apt update
   sudo apt install ansible

   Example for CentOS/RHEL:

   sudo yum install epel-release
   sudo yum install ansible

2. Configure SSH Access: Ensure that you have SSH access to the target host from your controller host. This involves having the SSH private key on the controller host and the corresponding public key added to the ~/.ssh/authorized_keys file on the target host.

   Example:

   ssh-keygen -t rsa -b 2048
   ssh-copy-id user@your_target_host_ip

   Enrico:

   ssh key erzeugen:
   ssh-keygen -t rsa -b 4096 -C "[email protected]"
   
   Pub key kopieren:
   ssh-copy-id -i /home/rico003/.ssh/vps_ec.pub [email protected]
   
   wenn fehler auftaucht:
   ssh-keygen -f "/home/rico003/.ssh/known_hosts" -R "173.249.46.248"

3. Inventory File: Create an inventory file that lists the target hosts you want to manage. This file typically named inventory can look like this:

   [target_hosts]
   target_host_ip ansible_ssh_user=user ansible_ssh_private_key_file=/path/to/private/key.pem

   Replace target_host_ip with the actual IP address of your target host, user with the SSH user, and /path/to/private/key.pem with the path to your private key.

4. Test Connection: Use the ansible command to test the connection to the target host:

   ansible -i inventory target_hosts -m ping

   If everything is set up correctly, you should see a successful ping response.

5. Create and Run Ansible Playbooks: Write Ansible playbooks to define the tasks you want to perform on the target hosts. Playbooks are written in YAML and define the desired state of the system.

   For example, create a playbook file (example.yml):

   ---
   - name: Example Playbook
     hosts: target_hosts
     tasks:
       - name: Ensure Nginx is installed
         package:
           name: nginx
           state: present
       - name: Ensure Nginx is running
         service:
           name: nginx
           state: started

   Run the playbook with:

   ansible-playbook -i inventory example.yml

These are the basic steps to connect from a controller host to another EC2 instance using Ansible. Adjust the details based on your specific setup and requirements.