To check if a Linux system is vulnerable to Spectre and Meltdown vulnerabilities, you can use various tools and techniques. Using the in-kernel command line tool: Use the following command to check if the system is vulnerable: grep -Ew ^flags /proc/cpuinfo | grep -Eqw “spectre_v2|l1tf” If the command returns “0”, then the system is vulnerable … Read more
The Intel microcode firmware update can be installed or updated on Linux using the following steps: Determine the version of your processor: $ cat /proc/cpuinfo | grep -m1 “model name” Download the appropriate firmware update package from Intel’s website or your Linux distribution’s repository. Install the firmware update package using the package manager for your … Read more
To install and setup Docker on RHEL 7/CentOS 7: Update the system: $ sudo yum update Add the Docker CE repository: $ sudo yum install -y yum-utils $ sudo yum-config-manager –add-repo https://download.docker.com/linux/centos/docker-ce.repo Install Docker CE: $ sudo yum install docker-ce Start Docker and enable it to start at boot: $ sudo systemctl start docker $ … Read more
To install Nginx on CentOS 7 or RHEL 7, you can use the following steps: Add the Nginx repository to your system: sudo nano /etc/yum.repos.d/nginx.repo Paste the following configuration in the file and save it: [nginx] name=nginx repo baseurl=http://nginx.org/packages/centos/7/$basearch/ gpgcheck=0 enabled=1 Install Nginx using the yum command: sudo yum install nginx Start Nginx service: sudo … Read more
To install Spotify on Linux, follow these steps: Add the Spotify repository to your system: sudo apt-key adv –keyserver hkp://keyserver.ubuntu.com:80 –recv-keys 931FF8E79F0876134EDDBDCCA87FF9DF48BF1C90 echo deb http://repository.spotify.com stable non-free | sudo tee /etc/apt/sources.list.d/spotify.list Update the package list: sudo apt-get update Install Spotify client: sudo apt-get install spotify-client Once the installation is complete, you can launch Spotify from … Read more
To install PHP 7.2 on CentOS 7/RHEL 7, follow these steps: Add the remi repository: sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm sudo yum install http://rpms.remirepo.net/enterprise/remi-release-7.rpm Enable the remi-php72 repository: sudo yum-config-manager –enable remi-php72 Install PHP 7.2 and its dependencies: sudo yum install php72 Verify the installation by checking the version of PHP: php -v This should display … Read more
To fix the error “client intended to send too large body: xyz bytes” in Nginx, you can increase the client_max_body_size value in the Nginx configuration file. The default value is often set to 1MB, but you can increase it to match your needs. Here’s how you can make the change: Open the Nginx configuration file … Read more
To configure Nginx with Let’s Encrypt SSL certificate on CentOS 7, follow these steps: Install certbot: sudo yum install certbot Install the Nginx plugin for certbot: sudo yum install certbot-nginx Stop Nginx: sudo systemctl stop nginx Obtain a SSL certificate using certbot: sudo certbot –nginx certbot will run an SSL certificate check and automatically configure … Read more
Ansible Vault allows you to encrypt sensitive data such as passwords, certificates, and keys, so that they can be stored safely in version control. To set a sudo password for Ansible Vault, you need to use the ansible-vault command as follows: Create an encrypted file: ansible-vault create secret.yml Enter a password for the vault. Enter … Read more
To install KVM on a headless CentOS 7 / RHEL 7 server, follow these steps: Verify Hardware: Check if your hardware supports virtualization. Run the following command to check: egrep -c ‘(vmx|svm)’ /proc/cpuinfo If the output is greater than 0, your hardware supports virtualization. Install KVM and QEMU: sudo yum install qemu-kvm qemu-img virt-manager libvirt … Read more