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Frequently Asked Questions
Question # 1
Which of the following statements is true regarding journals of a GFS2 filesystem?
A. Each GFS2 filesystem has exactly one journal.
B. Once a GFS2 filesystem is created, the number of journals cannot be changed.
C. Every node that simultaneously mounts the filesystem requires its own GFS2 journal.
D. Journals were heavily used in GFS and are deprecated and optional in GFS2.
E. The GFS Cluster Journal Daemon, GCJD, handles the journaling in a GFS2 cluster.
Question # 2
What is the name and path of the configuration file for the O2CB cluster that coordinates the nodes using OCFS2 filesystems?
A. /etc/ocfs2/cluster.conf
B. /etc/ocfs/cluster.conf
C. /etc/ocfs2.conf
D. /etc/cluster.conf
Question # 3
Which of the following statements are true regarding OCFS2? (Choose TWO correct answers.)
A. OCFS2 is an integral part of Pacemaker and relies on Pacemaker services for functionality.
B. To avoid the need for shared storage, OCFS2 can replicate the content of its filesystems via the network.
C. When using OCFS2 with additional cluster software, OCFS2 must be integrated into the overall cluster manager to ensure consistent cluster behaviour.
D. OCFS2 can be used without any additional software as it contains its own cluster manager, O2CB.
E. In addition to filesystems, OCFS2 can handle other cluster services such as IP addresses and server daemons.
Question # 4
How can the state of the backing storage disks of a DRBD device be checked? (Choose TWO correct answers.)
A. cat /proc/drdb/status
B. cat /proc/drdb
C. drbdadm dstate all
D. drbdadm diskstatus all
E. drbdadm state --disk all
Question # 5
Which of the following commands can be used to change properties such as the number of node slots or the label of an existing OCFS2 filesystem?
A. ocfs2.setprops
B. ocfs2tool
C. crm_edit
D. tunefs.ocfs2
E. o2cbtool
Question # 6
Which of the following can be used as a low level device for DRBD? (Choose TWO correct answers.)
A. A LVM logical volume
B. A physical hard disk
C. A rewritable CD
D. A virtual tape library
E. A tape streamer
Question # 7
Which O2CB mode should be used for OCFS2 integration with heartbeat?
A. user
B. dlm
C. heartbeat
D. kernel
Question # 8
When using DRBD in a Pacemaker cluster, which configuration objects must be managed in order to use the DRBD device as storage for other cluster services? (Choose TWO correct answers.)
A. A security resource in order to permit other cluster services to access the data on the
DRBD device.
B. A health resource in order to check the integrity of the file system.
C. A file system resource to mount the device.
D. A replication resource that synchronizes the DRBD device's data to all nodes that may take over the device after a failover.
E. A constraint to ensure the device is mounted before the dependent services are started.
Question # 9
What is the task of the Cluster Logical Volume Manager, CLVM?
A. It segments the cluster nodes into several logical groups that are always fenced together.
B. It balances incoming TCP connections to a logical service to several backend nodes.
C. It makes logical volumes on shared storage available to all cluster nodes.
D. It allows several nodes to share file system locks in order to access the same files simultaneously.
Question # 10
Which one of the following is NOT a required component for running an OCFS2 filesystem resource in a Pacemaker cluster?
A. A clone resource for the OCFS2 file system.
B. A shared storage device accessible by all nodes using the OCFS2 filesystem.
C. The distributed lock manager (DLM).
D. The cluster logical volume manager (CLVM).
E. The O2CB service.
Question # 11
Which kernel module must be loaded to initiate a RAID-1 like copy of data on two separate storage devices for a clustered storage solution?
A. rsyncd
B. drbd
C. clraid
D. clmirror
Question # 12
Using Linux Virtual Server (LVS) without any additional tools provides which of the following features?
A. Balancing network connections across several backend servers.
B. Automatically taking over the services of failed nodes.
C. Restarting failed services on the backend servers.
D. Checking the integrity of services on backend servers.
E. Starting and stopping backend servers as needed.
Question # 13
Which of the following statements are true regarding a load balancer? (Choose TWO correct answers.)
A. Failover clusters are not operational without at least one dedicated load balancer.
B. All response packages sent from a backend server to a client must pass through the load balancer.
C. The load balancer is usually deployed on one of the backend servers.
D. Load balancers may be able to analyze traffic.
E. All incoming connections to the cluster services are received by the load balancer.
Question # 14
How does the command to add a new resource to a Pacemaker cluster using crm begin?
A. crm manage cluster
B. crm configure resource
C. crm service add
D. crm configure primitive
E. crm resource new
Question # 15
Which of the following statements is true regarding a failover cluster?
A. The core component of every failover cluster is a load balancer.
B. Every service may not be run more than once in a cluster.
C. Failover clusters provide scalability of a service beyond the capacities of one cluster node.
D. Failover clusters always require storage that is shared by all nodes.
E. In normal operation, services may be spread over all nodes.
Question # 16
Which of the following are Pacemaker components? (Choose TWO correct answers.)
A. ccmd
B. crmd
C. fencer
D. pengine
E. keepalived
Question # 17
Which of the following configuration settings specify that keepalived is to use the round robin algorithm?
A. lb_mode rr
B. lb_algo rr
C. loadbalancer_mode=rr
D. algorithm=round robin
E. lb_algorithm=rr
Question # 18
In case one service in a Pacemaker cluster depends on another service running on the same node, which score should be assigned to the constraint describing that dependency?
A. -1
B. 0
C. 1
D. FORCE
E. INFINITY
Question # 19
Which of the following situations can result in a split brain situation in a high availability cluster?
A. The load balancer of a load balanced cluster fails.
B. The communication between the cluster nodes is interrupted.
C. Cluster services are moved between cluster nodes.
D. More than one node is active in a load balanced cluster.
E. A cluster node has successfully been fenced.
Question # 20
Which of the following sections are found in the Pacemaker configuration XML file?
A. and
B. and
C. and
D. and
E. and
Question # 21
Which of the following describes a split brain situation in a high availability cluster?
A. Several cluster nodes access a shared resource without coordination.
B. Several cluster nodes run different instances of the same services.
C. Incoming network connections are accidentally forwarded to more than one backend server.
D. Instead of shared storage, each node uses local storage managed by itself and replicates with other nodes.
E. In addition to shared storage, each node has local storage that is not shared with other nodes.
Question # 22
Which of the following statements are true regarding the Red Hat Enterprise Linux High Availability Add-On? (Choose TWO correct answers.)
A. It offers support for load balanced clusters only and cannot manage failover clusters.
B. It does not include any storage components.
C. It can be managed using the regular Pacemaker commands like pcs.
D. It uses its own messaging subsystem, RHMQ, for cluster communication.
E. It is built on top of several high availability components that are also available in other Linux distributions.
Question # 23
Which one of the following optionsrepresentsa valid declaration of a backend server with HAProxy?
A. host server_x 10.1.0.1:80 cookie server_x
B. backend server_x 10.1.0.1:80
C. server server_x 10.1.0.1:80 check
D. pool server_x 10.1.0.1:80
Question # 24
While setting up a load-balanced HTTP service, Linux Virtual Server was configured with the commands: ipvsadm -A -t 198.51.100.2:80 -s rr ipvsadm -a -t 198.51.100.2:80 -r 192.168.10.1:80 -m ipvsadm -a -t 198.51.100.2:80 -r 192.168.10.2:80 -m and all backend serversare using the LVS host as the default router.Which additional command has to be issued on the LVS host in order to correctly handle incoming HTTP traffic?
A. echo "1" > /proc/sys/net/ipv4/ip_forward
B. iptables -t nat -Z
C. ipvsadmin -L -n
D. ipmasq -A 192.168.10.1 -A 192.168.10.2 -p tcp --dport www -j DEMASQ
E. netstat -r
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