LPIC-3 304v1 Flashcards
what’a an alias for hypervisor?
virtual machine monitor (VMM)
what’s the difference between a hypervisor and hardware emulation?
In hardware emulation, a piece of hardware imitates another, while in hardware virtualization, a hypervisor (a piece of software) imitates a particular piece of computer hardware
what’s the name of the cli tool for OpenVZ?
vzctl
which cpu flag provides a intel VT cpu for full virtualisation?
vmx (virtual machine extensions)
which cpu flag provides a amd-v cpu for full virtualisation?
svm (secure virtual machine)
where can you see, if xen supports HVM?
/sys/hypervisor/properties/capabilities
LVS: what’s the VIP (Virtual IP Address)?
The IP address used by the director to provide services to client computers.
LVS: what’s the RIP (Real IP address)?
The IP address used to connect to the cluster nodes.
LVS: what’s the DIP (Directors IP address)?
The IP address used by the director to connect to network of real IP addresses
LVS: what’s the CIP (Client IP address)?
The IP address assigned to a client computer, that it uses as the source IP address for requests being sent to the cluster
which sysctl settings need to be adjusted in order to prevent the loopback device from responding to ARP?
net. ipv4.conf.lo.rp_filter = 0
net. ipv4.conf.all.arp_announce = 2
net. ipv4.conf.all.arp_ignore = 1
define the main syntax of genhash
genhash -s -p -u
how can genhash use SSL and what’s the option to define a virtual Host?
SSL= -S, virtualHost= -u
ipvsadm: add a new service
-A
ipvsadm: define a tcp service address
-t
ipvsadm: define the scheduler
-s
ipvsadm: add a new server
-a
ipvsadm: add a real server
-r
ipvsadm: use masquerading
-m
ipvsadm: save rules to stdout
-S
ipvsadm: read rules from stdin
-R
ipvsadm: name the scheduling methods and declare each
rr - round robin wrr - weighted RR lc - least connection lblc - locality based least connection lblcr - locality based least connection with replication dh - destination hashing sh - source hashing sed - shortest expected delay nq - never queue
which option of keepalived defines the LVS syncd interface?
lvs_sync_daemon_interface
VRRP? What’s it doing?
Virtual Router Redundancy Protocol, used to communicate between routers/loadbalancers to define a master holding an IP
IPVS?
IP Virtual Server
what is LVS Localnode and what purpose can it serve?
use the local node (loadbalancer) as a real server, can be good for a sorry server
what is LVS IP Tunneling?
packets are encapsulated and answered directly by the real server
what is LVS NAT?
the loadbalancer translates external IP to internal and vice versa
what is LVS DR?
the packets are forwarded by the loadbalancer directly to the real server and is also answered by the real server
what’s SSI related to LinuxPMI?
single system image
what’s the directory LPI is asking for but nobody knows of?
/usr/lib/heartbeat/ResourceManager
where’s the cluster config file of red hats cluster suite located?
/etc/cluster/cluster.conf
how can you create a skelton config for red hats cluster suite?
ccs_tool create
deploy cluster.conf to all nodes in red hats cluster suite
ccs_tool update /etc/cluster/cluster.conf
rhcs: show cluster status
clustat
rhcs: start/enable a service
clusvcadm -e
rhcs: stop/disable a service
clusvcadm -d
definition of cman?
“cluster manager” - decides if cluster has quorum
what is rgmanager?
counterpart of pacemaker
CCS?
Cluster Configuration System
rgmanager?
resource group manager
OCF?
Open Cluster Framework
where are red hats RA located?
/usr/share/cluster
which variable determines if ocfs can start?
O2CB_ENABLED
config file of OCFS?
/etc/ocfs2/cluster.conf
name the typical options for a ocfs node in cluster.conf
name, cluster, number, ip_address, ip_port
name the typical options for a ocfs cluster in cluster.conf
name, node_count
DLM (filesystem)?
Distributed Lock Manager
which options defines the name of the locking protocol for gfs2?
-p
which option defines the name of the lock table for gfs2?
-t
where’s the haproxy config located?
/etc/haproxy/haproxy.cfg
name haproxy’s 5 config sections
global defaults listen frontend backend
are haproxy acl’s case sensitive?
yes
which chars are allowed for haproxy acl’s?
upper and lower case digits _ . \: -
which acl flags are supported by haproxy?
- i
- f
- -
haproxy acl’s can match on which tcp layers?
4 and 7
which option of haproxy sets the loadbalancing algorithm?
balance
which loadbalancing algorithms are available for haproxy?
roundrobin static-rr leastconn source uri uril_param hdr rdp-cookie
which binary creates the qdiskd filesystem?
mkqdisk
how many nodes can be in an qdisk managed cluster?
16
what’s the name of the KVM kernel module?
kvm.ko
KVM loads a processor specific module, which two exist?
kvm-intel.ko and kvm-amd.ko
what’s the name of the kvm daemon?
libvirt-bin
which cli tool can create VMs?
virtinst
which cli tool can start/stop VMs?
virsh
which command lists KVMs virtual machines?
virsh -c qemu:///system list
which file is read by kvm_stat?
/sys/kernel/debug/kvm
which binary can specify disk images for guests?
qemu-kvm
create a 10G disk image called file.img with qemu in qcow format
qemu-img create -f qcow file.img 10G
which storage interface of qemu is faster than IDE?
virtio
