What methods and tools would you use to ensure the security of a production server in a working environment?

To ensure the security of the production server in a working environment, the following methods and tools can be used:

• Regularly updating the system and software to fix vulnerabilities.
• Configuring a firewall to restrict incoming and outgoing traffic.
• Using SSH with key authentication instead of passwords.
• Limiting access by IP addresses and setting user permissions.
• Monitoring logs and using intrusion detection systems (IDS).
• Backing up data and having a disaster recovery plan.
• Encrypting data and using certificates for secure connections.

Example of SSH key setup:

ssh-keygen -t rsa -b 4096
# Copy the public key to the server
ssh-copy-id user@server
# Disable password login in /etc/ssh/sshd_config
PasswordAuthentication no
systemctl restart sshd