Docker Certified Associate Certification Training Course - Device Mapper

The video tutorial explains the Device Mapper's requirements, focusing on LVM mode and its loop back mechanism. It highlights potential IO operation slowdowns and race conditions. The tutorial provides steps to configure Device Mapper with Docker, emphasizing the importance of JSON format in configuration files.

What are the necessary packages required for the device Mapper to function?

• LVM two and device Mapper persistent data

• LVM three and device Mapper temporary data

• LVM four and device Mapper static data

• LVM one and device Mapper volatile data

What is a potential drawback of using the loop back mechanism in device Mapper?

• It eliminates the need for kernel drivers

• It can slow down IO operations and be resource-intensive

• It increases the speed of IO operations

• It reduces the need for physical disks

What is the primary purpose of using loop LVM mode?

• To identify basic issues before a complex setup

• To perform advanced testing of direct LVM

• To enhance the speed of Docker services

• To replace the need for physical disks

Which command is used to stop the Docker service before configuring the device Mapper?

• Systemctl pause Docker

• Systemctl stop Docker

• Systemctl start Docker

• Systemctl restart Docker

What should be added to the Docker configuration file to set the storage driver?

• storage driver equals to virtual disk

• storage driver equals to device Mapper

• storage driver equals to direct LVM

• storage driver equals to loop LVM