Manage security

Context: RHCE certification command examples.

Manage security

Managing security is an important aspect of a Red Hat Certified Engineer (RHCE) role. Here are some command examples for managing security in a RHCE environment:

1. Firewall configuration:

   • firewalld: A dynamic firewall manager. Example: firewall-cmd --add-service=http --permanent (Allows incoming HTTP traffic)
   • iptables: A traditional firewall tool. Example: iptables -A INPUT -p tcp --dport 22 -j ACCEPT (Allows incoming SSH traffic)

2. SELinux management:

   • sestatus: Displays the status of SELinux. Example: sestatus
   • setenforce: Changes the mode of SELinux. Example: setenforce 1 (Enables enforcing mode)
   • semanage: Manages SELinux policy. Example: semanage fcontext -a -t httpd_sys_content_t '/var/www/html(/.*)?' (Adds a file context for Apache)

3. SSL/TLS certificate management:

   • openssl: A versatile cryptography toolkit. Example: openssl req -newkey rsa:2048 -nodes -keyout key.pem -x509 -days 365 -out cert.pem (Generates a self-signed SSL/TLS certificate)
   • certbot: An automated tool for obtaining and renewing Let's Encrypt certificates. Example: certbot certonly --webroot -w /var/www/html -d example.com (Obtains a Let's Encrypt certificate using the webroot plugin)

4. Audit and log management:

   • auditctl: Controls the kernel's audit system. Example: auditctl -w /etc/passwd -p wa -k password-file (Monitors changes to the /etc/passwd file)
   • journalctl: Views and manages system logs. Example: journalctl -u httpd.service (Displays logs for the Apache service)

5. SSH configuration:

   • sshd_config: The configuration file for the SSH server. Example: PermitRootLogin no (Disables root login via SSH)
   • ssh-keygen: Generates SSH key pairs. Example: ssh-keygen -t rsa -b 4096 (Generates a 4096-bit RSA SSH key pair)

These commands are just a starting point for managing security in a RHCE environment. It's essential to study and understand security best practices and refer to official documentation for more comprehensive information on each command and its usage.