LPI 304-200 LPI Level 3 Exam 304 Exam Practice Test

Failover clusters are not operational without at least one dedicated load balancer.

All response packages sent from a backend server to a client must pass through the load balancer.

The load balancer is usually deployed on one of the backend servers.

Load balancers may be able to analyze traffic.

All incoming connections to the cluster services are received by the load balancer.

crm_test

crm_simulate

crm_dryrun

crm_lab

crm_shadow

The overall capacity of all components in the cluster doesn't have to be larger than the resources needed in a regular setup.

The number of nodes in a cluster has no effect on the availability as long as the sum of the available computing resources isequal.

Failover clusters can be used to scale a single service beyond the capacity of a single cluster node.

In regular cluster operation, not all resources are used.

In case of the failure of any component, enough resources must remain to provide all cluster services.

cibquery -o resources

cibadmin -R

cibadmin -Q -o resources

cibquery -L resources

cib_admin -L resources

Uninterruptable Power Supplies, UPS

CPU frequency management tools

Blade Control Devices

Remote Management Services like iLO or DRAC

Local node storage

and

and

and

and

and

Each GFS2 filesystem has exactly one journal.

Once a GFS2 filesystem is created, the number of journals cannot be changed.

Every node that simultaneously mounts the filesystem requires its own GFS2 journal.

Journals were heavily used in GFS and are deprecated and optional in GFS2.

The GFS Cluster Journal Daemon, GCJD, handles the journaling in a GFS2 cluster.

/etc/ocfs2/cluster.conf

/etc/ocfs/cluster.conf

/etc/ocfs2.conf

/etc/cluster.conf

A LVM logical volume

A physical hard disk

A rewritable CD

A virtual tape library

A tape streamer

OCFS2 is an integral part of Pacemaker and relies on Pacemaker services for functionality.

To avoid the need for shared storage, OCFS2 can replicate the content of its filesystems via the network.

When using OCFS2 with additional cluster software, OCFS2 must be integrated into the overall cluster manager to ensure consistent cluster behaviour.

OCFS2 can be used without any additional software as it contains its own cluster manager, O2CB.

In addition to filesystems, OCFS2 can handle other cluster services such as IP addresses and server daemons.

ocfs2.setprops

ocfs2tool

crm_edit

tunefs.ocfs2

o2cbtool

Creation of new instances can be automated by using scripts or APIs and service interfaces.

The root file system of a computing instance is always persistent and can be accessed after the instance is destroyed.

Each and every user of an IaaS cloud has exactly one computing instance.

Once created, computing instances are seldom deleted in order to ensure the accessibility of the instance's data.

Instances may be created when needed and destroyed when they become obsolete.

xenstore-ls

xendo

xs

xl store

xstore

view

show

list-vm

list

list-all

It is a web interface used to provide self-service domain provisioning to users with sufficient privileges.

It saves the persistent configuration of all defined Xen domains and restores them when the host system is started.

It manages disk file images on behalf of all virtual machines and provides them as virtual devices to guest domains.

It stores run time information regarding Xen and its domains using hierarchical namespaces shared between domains.

It is a software repository located within the host system used to provide software packages to the guest domains.

Guest operating systems are modified to actively cooperate with the hypervisor in order to ease virtualization costs and gain better performance.

Instead of running full virtual machines, containers are used to separate distinct parts of one commonly shared operating system that appear as a virtual machine.

To avoid the need for virtualization, special security measures are taken to allow different applications to coexist on one physical machine.

Each operating system is trusted to use only those resources assigned to it, thereby eliminating the need of an additional virtualization layer.

ifconfig

brctl

tunctl

ipconfig

ebtables