troubleshooting

Which command checks the status of the libvirtd service?

A libvirt storage pool of type 'dir' contains several qcow2 images. You want to create a new snapshot of an existing VM using virsh. Which command sequence is required to create an internal snapshot of the VM's current state?

Which hypervisor is known for being 'Type 2'?

Which TWO of the following are true regarding the differences between rkt (Rocket) and Docker?

In systemd-nspawn, how can you execute a command inside a container that is already running?

In a FreeBSD Jail, how can you ensure the jail starts automatically at boot?

Which TWO of the following are common ways to connect to a virtual machine's console?

Which Docker network driver should you use if you want containers to have their own IP addresses on the physical network, as if they were physically connected to the network?

You need to change the MAC address of a network interface for a virtual machine. Where is this configured?

What is the purpose of the 'virt-install' tool?

You are configuring a virtual network with a static IP address for a VM. Where do you define the DHCP host entry in the libvirt network XML?

When building a Dockerfile, which instruction should be used to define the user context for subsequent RUN, CMD, and ENTRYPOINT instructions?

When configuring a systemd-nspawn container, what is the effect of the --private-network option?

A Docker container running a web server is unable to serve traffic on port 8080. You verify the Dockerfile exposes port 80. What is the correct way to map this for external access?

Which THREE of the following are valid virtio device types?

Which libvirt network type uses a bridge on the host to connect virtual machines directly to the physical network?

Which TWO of the following are valid storage pool types in libvirt?

You are configuring a virtual network with a bridge. You want to disable DNS services for that network. What XML element within the <network> definition do you remove or comment out?

You are running a Docker container and need to map port 8080 on the host to port 80 in the container. Which command argument should you use?

Which Dockerfile instruction is used to copy a file from the host file system into the image?

You have a qcow2 disk image that is growing too large. You want to shrink the file size on the host while keeping the virtual disk the same size. Which steps must you perform first?

Which THREE instructions in a Dockerfile can modify the image's filesystem?

What is the primary function of the libvirtd daemon?

Which THREE features are provided by the Vagrant 'synced_folder' functionality?

Which file system format is specifically designed for QEMU/KVM to support advanced features like copy-on-write, snapshots, and compression?

You are configuring a Xen guest that requires direct hardware access to a specific network interface card. Which configuration parameter in the guest domain configuration file must be specified to enable PCI passthrough?

Which signal is sent to a QEMU process when you run 'virsh destroy'?

When provisioning with Vagrant, which command is best used to apply changes to a configuration (like adding a new shell script) without destroying the existing virtual machine?

You want to limit the bandwidth of a virtual network interface. Which XML element within <interface> allows you to configure this?

In a Vagrant environment, where should sensitive data like API keys be stored to avoid committing them to version control?

Which TWO of the following commands can be used to monitor VM resource utilization?

You are configuring LXC and want to set a CPU limit for a container. Which cgroup parameter is used to specify the quota of CPU time in microseconds?

When configuring a VM in libvirt, you want to ensure the highest performance for disk I/O. Which driver type should you select for the disk device?

Which THREE networking modes are natively supported by Docker?

Which THREE features are provided by Linux Namespaces in the context of containers?

Which THREE settings are commonly configured in the 'provider' block of a Vagrantfile for virtualbox?

Which kernel feature provides the isolation necessary for namespaces in container virtualization?

When using Vagrant to manage a libvirt-based provider, which command verifies that the virtual machine is currently running and identifies the provider in use?

Which THREE of the following are valid components of a libvirt domain XML configuration?

What does the 'docker rm' command do?

Which hypervisor type is considered 'Type 1' virtualization?

A Docker container is failing to connect to an external database despite the host being able to ping it. You suspect a bridge networking issue. Which command allows you to inspect the current NAT rules created by Docker?

You need to add a second NIC to a VM via XML. How do you ensure the second NIC uses a different MAC address than the first one?

Which file is primarily responsible for defining the configuration and environment variables for an OpenVZ container?

Which THREE of the following are valid options for 'virsh shutdown'?

You are using systemd-nspawn. How do you create an image of a container to be used as a template?

What is the purpose of the virtio-balloon driver in a guest?

You need to ensure that a specific package is installed during the first boot of a cloud instance. Which cloud-init key should be added to the configuration?

Which command is used to display the configuration of a Packer build in a readable format?

What is the primary function of a Docker Registry?

When configuring cloud-init 'network-config', which format is primarily used to describe network interfaces?

What is the purpose of 'virt-top'?

When defining a Vagrant network configuration for a libvirt provider, which mode allows the VM to receive an IP address directly from the physical network's DHCP server?

Which file in a Vagrant project directory is processed by default to define the virtual environment configuration?

Which TWO of the following are valid ways to configure VM networking?

You are configuring a virtual network in libvirt that allows VMs to communicate with each other and the host, but prevents them from accessing the external network. Which mode should you select for this network?

You are using QEMU to emulate an ARM architecture on an x86_64 host. You need to ensure the guest has access to the host's filesystem directly without configuring network shares. Which option is the correct way to pass a directory through to the guest?

When using systemd-nspawn, you want to limit the memory usage of a container to 512MB. Which flag should be passed to the systemd-nspawn command?

When using 'docker-compose', which file format is used to define the services?

When using Docker volumes, which type of mount should you use if you want the data to persist on the host filesystem at a specific, user-defined path?

You are configuring a QEMU-KVM guest to use VirtIO-net. Which parameter in the QEMU command line correctly enables the virtio-net-pci device with a tap interface named tap0?

What is the purpose of the 'virsh' tool?

Which THREE configuration items can be managed via cloud-init 'write_files' module?

In a Vagrantfile, which method is used to pass environment variables into the guest virtual machine during the provisioning phase?

You are troubleshooting a container networking issue. You notice that traffic from the container is not being SNATed. What should you check in the iptables rules?

Which command is used to remove an unused Docker image?

Which TWO of the following are valid container orchestration platforms?

Which TWO commands are used to manage images in Docker?

Which THREE of the following attributes can be defined within the <memoryBacking> XML block?

Which THREE storage drivers are supported by Docker?

What is the main advantage of using a container over a virtual machine?

You need to inspect the metadata of a specific Docker image without pulling it from a remote registry. Which command should you use?

You are debugging a Docker image buildup that fails at the 'RUN' instruction due to missing network access during the build. What command option should be checked if the build environment uses a proxy?

You are troubleshooting a libvirt migration that fails with 'Operation not supported: Migration requires a storage pool'. You need to perform a block migration where the storage is copied to the destination host. Which command-line flag enables this functionality?

You are using BSD Jails and need to start a jail. Which utility is the standard management tool for jail administration?

Which QEMU-KVM feature allows you to save the state of a VM to a file and resume it later?

You need to attach a new block device to a running VM. What virsh command achieves this?

You need to inspect the configuration of an LXC container named 'web'. Which command should you use?

In the context of virtualization, what does 'ballooning' refer to?

You need to convert a raw disk image to QCOW2 format to enable snapshotting. Which command is correct?

Which TWO of the following commands can be used to manage virtual networks in libvirt?

Which THREE items are typically included in an OpenVZ configuration file?

Which TWO of the following are valid ways to trigger provisioning in Vagrant?

Which command is used to list all defined virtual networks in Libvirt?

You need to enable hugepages for a VM in libvirt to improve memory performance. What XML entry do you add?

You are troubleshooting a problem where an LXC container cannot access its own /dev/null. What is a common cause in a non-root container?

What is the default behavior of Vagrant when a box is not found locally on the host machine?

Which tool is commonly used alongside Packer to validate the configuration file for syntax errors before attempting a build?

You are configuring an LXC container and need to grant it access to a specific host character device without running the container in privileged mode. Which configuration option in the container's config file should you use?

In cloud-init, which syntax is required at the very beginning of the configuration file to ensure it is recognized as a cloud-config script?

You are using a BSD Jail and want to limit the filesystem access of the jail to a specific directory tree. Which utility or configuration mechanism is primarily used to achieve this?

In a Docker swarm, which mode of service publishing allows incoming traffic to be load-balanced across all healthy container replicas?

Which command lists all Docker images currently on the host?

Which TWO of the following are valid network modes for a libvirt virtual network?

When cleaning up Docker resources, which command will remove all stopped containers, unused networks, and dangling images in one step?

When using Vagrant with multiple machines in a single Vagrantfile, how do you define individual configurations?

You are using an overlay network in Docker Swarm. What is the standard protocol used for the control plane and data plane communication between nodes?

What does the term 'KVM' stand for?

Which THREE of the following are required for a successful live migration between two KVM hosts using libvirt?

Which utility is best for creating a new libvirt storage pool?

You need to limit the amount of CPU shares a Docker container can utilize. Which flag should be used?

Which Docker command is used to display the resource usage (CPU, memory) of running containers?

Which cloud-init module is responsible for setting the hostname of the instance during the initial boot process?

When configuring a Docker volume that needs to be shared between multiple containers, which storage driver storage path is recommended to ensure persistent data availability if the host reboots?

Which THREE configuration items can be managed by LXC cgroups?

Which TWO of the following are valid ways to manage storage pools using virsh?

What is the default location for libvirt domain configuration XML files?

Which TWO components are defined in a Packer 'build' block?

You are optimizing a Dockerfile to reduce image size. Which THREE of the following practices are recommended?

Which file system structure is typically used for QEMU virtual disk images when using LVM?

You are troubleshooting a performance issue and want to pin a VM process to specific physical CPU cores. Which XML element is used?

Which command is used to list all active running domains?

In the context of container orchestration, what is the role of a 'sidecar' container?

When using Packer with the QEMU builder, what does the 'format' option in the 'qemu' builder define?

Which THREE of the following are valid Libvirt storage pool types?

You are troubleshooting a libvirt network issue where the virtual machines cannot reach the external gateway. The virtual network uses a NAT configuration. Which file would you inspect to verify the iptables rules generated by libvirt for this network?

You are debugging a Docker network issue where containers on different hosts cannot communicate. Which network driver is specifically designed to support multi-host overlay networking?

You want to optimize disk I/O performance for a KVM guest. Which bus type should you configure in the libvirt domain XML for the virtual disk?

Which command-line tool is primarily used to inspect the metadata and configuration of a running Docker container?

When migrating a Libvirt domain using 'virsh migrate --live', which option must be specified to ensure the guest's memory state is copied over the network?

In a Xen environment, which command would you use to change the number of VCPUs allocated to a running domain 'dom1' to 4?

Which THREE of the following are components of the Docker architecture?

You need to migrate a running QEMU VM to a remote host using live migration. Which command-line argument for QEMU-KVM initiates a migration to a target host at 192.168.1.50 on port 4444?

You need to create a snapshot of a QCOW2 disk image without stopping the virtual machine. Which qemu-img sub-command should be used?

You are using QEMU to emulate an ARM architecture on an x86 host. Which binary would you typically use to execute this?

Which command allows you to enter an existing running container and execute a new command inside it?

Which THREE of the following are legitimate security concerns when managing a virtualization host?

Which option for 'qemu-img create' allows you to create a preallocated image?

Which TWO pieces of information does Packer require to build an image for an existing cloud environment?

You are configuring cloud-init to inject an SSH key into a new VM. Which directive in the configuration metadata ensures the key is added to the correct user's authorized_keys file?

Which TWO types of namespaces are commonly used to achieve container isolation in Linux?

Which THREE of the following are necessary to enable QEMU guest agent integration?

What is a 'snapshot' in virtualization?

You are building a multi-stage Dockerfile and want to copy a binary from the 'builder' stage to the final stage. Which syntax is correct?

You are migrating a legacy application to an LXC container and need to ensure the container has access to the host's /dev/sda block device. Which configuration key must be added to the container's configuration file?

Which component is responsible for the actual hardware-assisted virtualization in KVM?

You are using Packer to automate a build. You notice the build fails because the 'communicator' cannot connect. Which type of communicator is most suitable for a KVM-based build where SSH is not yet configured?

Which THREE of the following are valid storage driver options for Docker on Linux?

Which THREE of the following are valid elements inside the <interface type='bridge'> block?

Which command-line option is used to run a Docker container in the background (detached mode)?

You are managing an LXC container and need to create a snapshot of the container's root file system. Which command achieves this?

In an OpenVZ environment, you need to limit the number of processes a container can create. Which parameter in the container configuration file should be modified?

Which of these is a valid virtualization storage pool type supported by libvirt?

In systemd-nspawn, how do you specify a different root directory for the container?

What is the primary difference between a container image and a container instance?

Which THREE commands are used to manage the lifecycle of an LXC container?

What is the primary function of the ENTRYPOINT instruction in a Dockerfile?

Which THREE of the following are necessary components for a successful KVM virtualization environment on Linux?

Which TWO items are typically included in a Docker context?

How do you view the logs of a running container?

Which instruction in a Dockerfile is best suited for installing packages to minimize image size?

Which command is used to start a VM that has been defined?

How do you define a new libvirt virtual network from an XML file named 'net.xml'?

In a Packer build process for OpenStack, which 'post-processor' type is typically used to upload the resulting image to the Glance image service?

Which THREE of the following XML elements are used to define a virtual disk in a domain?

Which TWO commands are valid for inspecting container network settings?

What is the purpose of the 'rkt' (Rocket) container runtime?

You are performing a live migration of a VM using libvirt. The source and destination hosts share a common storage pool (NFS). Which option should be used with 'virsh migrate' to ensure only the memory state is transferred?

Which THREE of the following steps are involved in performing a manual disk migration of a VM?

Which command shows the history of layers in a Docker image?

Which command is used to display the XML configuration of a running VM domain named 'webserver'?

You are using Docker and want to create a volume that is shared between multiple containers and persists even if the containers are deleted. What is the best approach?

A cloud-init configuration file is failing to apply the 'write_files' module. Which log file on the target instance should you examine to diagnose the parsing error?

What is the role of the 'Dockerfile' in the container build process?

A VM is hanging because of a specific hardware emulation bug in QEMU. You need to enable the 'qxl' video device to see if it resolves display issues. What is the XML tag to define the video device in the domain config?

Which TWO of the following are benefits of using the QCOW2 image format?

Which TWO of the following are valid storage drivers used by Docker to manage image layers?

Which TWO of the following commands are used for VM disk image management?

What is the primary function of the cloud-init 'runcmd' module?

You are troubleshooting a Docker container that cannot reach the internet despite the host having connectivity. The container uses the default bridge network. Which iptables chain is most likely causing the block?

Which command provides system-wide information about the Docker installation?

Which THREE of the following are common cloud-init modules?

Which THREE directives are valid under the cloud-init 'users' configuration section?

You need to run a container that requires access to the host's network namespace directly to perform packet capture. Which Docker run flag should you use?

You have an active domain named 'myvm'. How do you gracefully shut it down?

Which flag is used to run a container in the background?

What does 'QEMU' stand for?

When migrating a domain with virsh, which TWO of the following options can be used to ensure the migration is successful if the destination host has a different CPU architecture or feature set?

What is the purpose of the 'ENTRYPOINT' instruction in a Dockerfile?

Which TWO of the following are key features of the QEMU-KVM hypervisor?

How can you force a refresh of a libvirt storage pool named 'isos'?

You are configuring an OpenVZ container. Which command is used to set the hostname of the container from the host?

Which TWO methods can be used to pass configuration data to cloud-init during instance creation?

In a Docker environment, you are observing that container logs are consuming too much disk space. Which logging driver should you configure to limit the number and size of log files?

Which TWO of the following are true regarding container orchestration platforms?

Which TWO of the following are valid libvirt storage pool lifecycle commands?

You are managing a Xen host and need to live-migrate a domain between two physical servers. The migration fails with a domain lock error. Which command is the standard way to initiate a live migration while ensuring the target host is prepared to receive the domain?

In a Packer HCL2 file, how do you reference a variable named 'image_name' that was declared in the 'variables' block?

Which command is used to stop all running containers?

When managing storage pools using virsh, which command would you use to list all defined storage pools, including those that are inactive?

You are using Packer to build a custom image for KVM. Which HCL2 block is specifically required to define the virtualization parameters like memory and CPU for the builder?

Which Packer builder is most appropriate for creating an image specifically for Amazon Web Services (AWS)?

You are using libvirt to manage a QEMU VM. You want to pass a specific host USB device with vendor ID 1234 and product ID 5678 to the guest. Which XML element is used inside the <devices> block to define this?

You are using systemd-nspawn and want to run a container that shares the host's network namespace. Which flag is required?