To configure a static IP address on CentOS 7 / RHEL 7, follow these steps: Open the network configuration file: Open the file “/etc/sysconfig/network-scripts/ifcfg-eth0” using a text editor. The “eth0” in the file name refers to the name of the network interface you want to configure. If you have multiple network interfaces, you will have … Read more
You can use the “dd” command to create a disk image on Linux or Unix systems. Here are the steps to create a disk image: Identify the source disk: You can use the “lsblk” or “fdisk -l” command to identify the source disk and partition you want to create the image of. For example, if … Read more
To configure a Wi-Fi and LAN bridged access point in pfSense firewall router, you need to perform the following steps: Connect to the pfSense web interface. Go to Interfaces > (assign) > Bridges and add a new bridge. Give the bridge a descriptive name, such as “WiFiLANBridge”. Select the Wi-Fi and LAN interfaces you want … Read more
To create a “cron.log” file to log crontab logs on Ubuntu 16.04, 18.04, and 20.04, you can use the following steps: Create the “cron.log” file: # touch /var/log/cron.log Change the ownership of the file to the syslog user: # chown syslog:adm /var/log/cron.log Edit the syslog configuration file: # nano /etc/rsyslog.d/50-default.conf Add the following line to … Read more
The “bad username” error message when reading the “/etc/cron.d” file on Linux typically occurs when the username specified in the cron job does not exist on the system. To resolve this issue, you can either: Correct the username in the cron job file: # nano /etc/cron.d/your_cron_job_file Use a valid username that exists on your system. … Read more
To configure Postfix to use an external SMTP server as a relayhost (smarthost), you can use the following steps: Edit the Postfix configuration file: # nano /etc/postfix/main.cf Add or modify the following line: relayhost = smtp.example.com:587 Replace smtp.example.com with the hostname or IP address of your SMTP server and 587 with the port number if … Read more
To install KVM on a headless Ubuntu 16.04 LTS server, you can use the following steps: Verify that your system supports virtualization: # egrep -c ‘(vmx|svm)’ /proc/cpuinfo If the output is 0, your system does not support virtualization. Install the necessary packages: # apt-get update # apt-get install qemu-kvm libvirt-bin bridge-utils Add your user to … Read more
To force users to use secure passwords on Ubuntu or Debian Linux, you can use the “pam_cracklib.so” module in PAM (Pluggable Authentication Modules). This module checks the strength of passwords before allowing them to be set. Here are the steps to enable password checks with PAM: Install the “libpam-cracklib” package: # apt-get install libpam-cracklib Edit … Read more
To apply patches on an OpenBSD system, you can use the “syspatch” command. This command updates the operating system and packages with the latest security patches. To use it, run the following command as root: # syspatch If there are no patches available, you will see the message “Your system is up to date.” If … Read more
To apply patches on an OpenBSD system, you can use the “syspatch” command. This command updates the operating system and packages with the latest security patches. To use it, run the following command as root: # syspatch If there are no patches available, you will see the message “Your system is up to date.” If … Read more