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AWS sysops admin- associate 2020 > Deployment and Provisioning > Flashcards

Deployment and Provisioning Flashcards

1
Q

Common reasons why EC2 instnaces may fail to launch

  • InstanceLimitExceeded error
  • you have reached the limit on teh number of instnaces you can launch in a region
  • aws sets default limits on the number of instances you can run on a per-region basis - 20 by default
A

t

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2
Q

InsufficientInstanceCapacity error

-AWS does not currently have enough available On-Demand capacity to service your request

A

y

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3
Q

____ allows you to create storage volumes and attach them to your EC2 instances.

A

EBS

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4
Q

___ can be used to craete.a file system, run a database, run an operation system, etc.

A

EBS

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5
Q

____ backend storage - used fr OS and databases which can be IO intensive.

A

SSD

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6
Q

2 different variants of SSD:

gp2 ___ - boot volumes

io1 ___ - IO intensive, NoSQL/relational databases, latency sensitive workloads

____ used to benchmark performance for SSD volumes

A

general purpose

Provisioned IOPS

IOPS

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7
Q

IOPS capability is dependent on the size of your volume:

gp2 volumes: (minimum 100 IOPS) 3 IOPS/GB up to a max of _____ IOPS

io1 volumes: 50 IOPS/GB to a amx of _____ IOPS

A

16,000

64,000

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8
Q

what happens if you are using gp2 and your workload exceeds the IOPS limit of teh gp2 volume you have provisioned?

A

you will start to get your IO requests queing

depending on your apps seneitivity to IOPS and latency, you may see your app becoming slow.

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9
Q

Hitting the IOPS limit of our gp2 Volume

what can you do about it?

explain the 2 approaches to address hitting the IOPS limit:

A
  • For gp2, you can increase the size of your volume - but if your volume is already 5.2T or moer, you will have already reached teh 16,000 IOPS limit for gp2 volumes
  • If you need more tahn 16,000 IOPS, you will need to change your storage class to Provisioned IOPS
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10
Q

A bastion host is located in your ____ subnet

A

public

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11
Q

a bastion host allows you to connect your ec2 instances using ___ or ___ protocols

A

ssh or rdp

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12
Q

T or F

you can log in to the Bastion host over the internet, from your desktop

A

T

If the settings allow it

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13
Q

T or F

the bastion host is used to initiate an SSH/RDP session over the private subnet to your ec2 instances in teh private subnet

A

T

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14
Q

____ load balancers scale automatically to adapt to your workload

A

application

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15
Q

xx messages indicate that something has gone wrong on the client side

A

400

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16
Q

xx messages relate to server side errors

A

500

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17
Q

= Bad/malformed request - ie: the header is malformed

A

400

18
Q

Unauthorized - user access denied

A

401

19
Q
  • forbidden - request bloked by WAF access control list
A

403

20
Q
  • client closed connection before the load balancer could repond, client timeout period may be too short
A

406

21
Q
  • load balancer received an X-Forwarded-For request headerwith >30 IP addresses - similar to a malformed request
A

463

22
Q
  • Internal srver error iee: error on the load balander
A

500

23
Q
  • bad gateway - ie: an app server closed the connection or sent back a malformed response
A

502

24
Q
  • server unavailble - no registered targets
A

503

25
Q
  • gateway timeout - ie: ap is not responding - problem with your web server, app server or database
A

504

26
Q
  • Unauthorized - received an error code from the ID provider when trying to authenticate a user
A

561

27
Q

____ load balancers publish metrics to CW for the load balancer and for the backend instances

A

elastic

28
Q

t or F

ELB CW metrics help to verify taht your system is performing as expected

A

T

29
Q

ELB CW metrics - overall health

_____ number of unsuccessfl conenctions to backend instances

_____ number of healthy insatnces registered

___ number of unhealthy instances

____2xx,3xx,4xx,5xx

A

BackendConnectionErrors

HealthyHostCount

UnHealthyHostCount

HTTPCode_Backend

30
Q

____ number of seconds taken for ergistered instance to respond/connect

A

Latency

31
Q

____ number of requests completed/connections made during teh specified interval (1 or 5 min)

A

RequestCount

32
Q

____ number of pending requests, max queue size is 2014, additional requests will be rejected (Classic only)

A

SurgeQueueLength

33
Q

_____ number of requests being rejected because the surge queue is full (Classic only)

A

SpilloverCount

34
Q

____ is a mangment tool which gives you visibility and control over your AWS infrastracture.

It integrateswith CW allowing you to view your dashboards, view operational data and detect problems.

Includes ___ which automates operational tasks across resources - ie: security patching, package installs.

Organize your inventory, grouping resources together by applicaiton or environment - including on prem systems.

A

Systems Manager (SSM)

Run Command

35
Q

_______

allows you to run pre-defined commands on one or more EC2 instances.

  • stop, restart, terminate, re-size instance
  • attach/detach EBS volumes
  • create snapshots, abckup dynamoDB tables
  • apply patches and upadtes
  • run an ansible playbook
  • run a shell script
A

run command

36
Q

3 types of placement groups:

___ instances are all created in a single AZ

___ instances are created in logical segments called partitions, each located in a separate rack(s), with independent network and power.

____ each instance is created in a separate rack, with independent network and power.

A

CLuster, Partition, Spread

37
Q

___ placement groups

  • all instances created in same AZ
  • all nodes within the placement group can talk to all other nodes within the placement group at the full line rate of 10Gbps
  • Not great availability (ideally, you’d want a copy of your stack in another AZ as well)
  • great if the separate compnents in your app require high network throughput
A

cluster

38
Q

_____ placement group

  • instances are created in logical segments called partitions, can be multi-AZ
  • each partition is in a separate rack(s), with independent network and power
  • partitions cannot share racks which helps reduce the impact of a failure
  • great for large distribuetd/replicated workloads, such as HDFS< HBase, and Cassandra
A

Partition

39
Q

___ placement groups

  • instances placed on distinc racks, each with its own network and power source
  • recommend for apps with small number of critical intances taht should be separated
  • reduces teh risk of simultaneous failures when instances share the same racks.
  • gurantees your instances are places in different racks with isolated power and networking.
A

spread

40
Q
A

AWS sysops admin- associate 2020 (12 decks)

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