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 (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.

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Manage Software

Arduino is an LFCS candidate work as a RHEL Engineer at Red Hat: Managing software is one of the 64 LFCS exam objectives.