Category: Linux

Fedora - unlock LUKS full disk encrypted system using USB stick

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Follow below steps to enable unlocking LUKS full disk encrypted system using key file stored on USB stick Format USB key with FAT32 filesystem. Generate random keyfile: dd if=/dev/urandom of=/path/to/usbdisk/keyfile bs=4096 count=1 Add key to luks volume: cryptsetup luksAddKey /dev/sda6 /path/to/usbdisk/keyfile Check USB partition disk UUID: lsblk /dev/sdb1 -o NAME,UUID XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX - UUID of LUKS… Continue reading Fedora - unlock LUKS full disk encrypted system using USB stick →

Fedora 36 - fix for issue with new kernel installation

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Sympthons: On UEFI Fedora 36 machines with long upgrade history (for instance starting from F25) you can encounter problem that after "dnf update kernel-core" new kernels are not being installed. Reason: When directory /boot/efi// is present, system is trying to install new kernel images into /boot/efi// instead of /boot/, which issues with /boot/efi/ overflow. Resoloution:… Continue reading Fedora 36 - fix for issue with new kernel installation →

Running nested VMware ESXi 7.0 host under KVM hypervisor

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Prerequisites: hardware support for VT-x enabled nested virtualization for KVM Use below command to create KVM virtual machine containing VMware ESXi: virt-install --virt-type=kvm --name=vmware-esxi7 \ --ram 4096 --vcpus=4 \ --virt-type=kvm --hvm \ --cdrom /home/pawel/ISO/VMware/VMware-VMvisor-Installer-7.0U3d-19482537.x86_64.iso \ --network network:default,model=vmxnet3 \ --graphics vnc --video qxl \ --disk pool=default,size=32,sparse=true,bus=sata,format=qcow2 \ --boot cdrom,hd --noautoconsole --force \ --cpu host-passthrough --os-variant linux2020… Continue reading Running nested VMware ESXi 7.0 host under KVM hypervisor →

Docker 20.10 fails to start on CentOS 8 and Fedora 33

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After upgrading Docker to version 20.10 on CentOS 8 and Fedora 33 we can see that it fails to start docker.service. In docker.service logs and firewalld.service logs we can see following message: ERROR: ZONE_CONFLICT: 'docker0' already bound to a zone Solution for this issue: sudo firewall-cmd --zone=trusted --remove-interface=docker0 sudo firewall-cmd --zone=trusted --remove-interface=docker0 --permanent

Jenkins Pipeline for building, testing and running Docker containers

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Example Jenkins Pipeline for building, testing and running Docker containers. Ingredients: • Jenkinsfile - Pipeline specification • GitHub - source code repository (for app and Jenkinsfile) • DockerHub - container registry Required Jenkins plugins: • GitHub plugin • Docker Commons Plugin • Build With Parameters • Pipeline plugin Pipeline architecture schema: