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ACE prep > 6. Compute Engine > Flashcards

6. Compute Engine Flashcards

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1
Q

Virtual Machine/Instance billing

A
  • Each VM is charged per second.
  • Each VM is launched within a specific VPC network and a specific zone.
  • Multi-tenant host / sole-tenant node - allows only you to access the VM, eg for security purposes.
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2
Q

VM configuration: vCPU (choice of machine type), i.e. Machine Configuration

A

Predefined OR Custom
Predefined machine types (e2…):
- general
- compute
- memory
Note: Intel or AMD platforms are available

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3
Q

vCPU

Network throughput

A

virtual CPU

= 2Gbps per vCPU

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4
Q

VM configuration: Operating System

A

Public image: compatible Linux or Windows operating system
Custom image: private images (snapshots/existing disk); boot disk images that you have access to.
Note: here there is an image storage charge.
Marketplace: deploy functional software packages on Google Cloud; can start the software package without manually configuring the software

Note: if an image has (p) next to it, means that it applies per second billing after the first minute.

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5
Q

Images

A
  • Boot loader info
  • OS
  • File system structure
  • Software (maybe you want to have specific software pre-installed)
  • Customisations
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6
Q

VM configuration: Storage

A

Either pay less but have a lower disk speed or pay more and have a higher iops.

Standard (HDD): cheapest/slowest
Balanced (SSD):
SSD: most expensive/fastest

Local SSD: these are physically directly attached to the VM, so they have the lowest latency. BUT once the instance is stopped or deleted the memory there no longer persists.

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7
Q

VM configuration: Networking

A

Default:

Custom:
- many available regions/zones
- ingress/egress firewall rules etc

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8
Q

Boot disk

A
  • can choose to preserve the disk even if the VM is deleted
  • a VM can have up to 128 disks attached to it (only 16 if it’s a shared-core VM)
  • but having more disks means reducing the bandwidth for egress/ingress firewall traffic

Persistent disk (HDD - good for simply having capacity or SSD - good for having performance)
- not physically attached but survives if the VM is stopped
- scales with size
- HDD or SDD
- can be attached in Read-ONLY mode to multiple VMs (cheaper than replicating the data on each disk separately)
- Zonal or regional
– Standard (pd-standard - suitable for large workloads)
– pd-ssd (good for high performance DBs with lower latency)
– pd-balanced (balance performance vs cost)
– pd-extreme (zonal only) (high performance for DB)
-Encryption keys:
– Google-managed
– Customer-managed
– Customer-supplied

Local disk
- Physically attached to a VM
- High iops
- VM resets don’t impact it but stops and deletions do
- Higher performance than SSD

RAM disks
- tmpfs (storing data in memory)
- higher performance than Local Disk
- The storage is volatile, easily erased
- persistent disk should be used to back up this data

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9
Q

Creating a VM instance (DEMO)

A
  • In the installation process, below the memory options (2Gb… CPU…), there will be Display Device, this should be ticked if I want to do screen capturing and recording on the VM.
  • Confidential VM service - allows to encrypt data when it is being processed on the VM.
  • Boot disk: allows to choose between public/custom images, snapshots and existing disks; here the disk type is chosen (standard persistent, Balanced SSD, SSD)
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10
Q

Creating a VM instance (DEMO): things that I can change / cannot after creating a VM

A

Stop instance before changes are possible:
1. Machine Configuration (eg e2-micro)
2. Display device - stop instance before changes are possible.
3. Confidential VM or not
4. Instance name
5. Load Balancer

Cannot change:
1. Zone / Region - cannot change
2. Boot disk (image: ubuntu, Linux…); type of disk (balanced disk type etc); size (10Gb etc)
3. Interfaces, once set upon VM creation, cannot be changed

Side note: all VMs will have a new service account assigned to them by default

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11
Q

Compute Engine: Machine Types (example)

A

After selecting pre-defined vs custom, we first choose machine family, then series, then machine type:

e2-standard-32
series - type - vCPUs amount

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12
Q

Compute Engine: Machine Familities / Types (general overview)

A

Predefined:

Family: General-purpose
- E2 - day-to-day, lower cost
- N1 (GPU is only available for N1 series)
- N2
- N2D
- Tau T2D
- Tau T2A (scale optimised)

Family: Compute-optimised
Ultra high performance for compute-intensive workloads such as Gaming, Electronic Design Automation (EDA), Single-Threaded applications
- C2 (Standard);
– only available on predefined machine types, not for custom;
– 4 to 60 vCPUs
– Memory: from 16 GB to 240 GB
– cannot use regional persistent disks with this type
- C2D (larger)
- H3 (even higher)

Family: Memory-optimised (committed use discounts availabile)
- M1 (Mega memory / Ultra-memory) 4 Tb of memory
- M2 (Mega memory / Ultra-memory) 12 Tb of memory
- M3

Family: Accelerator-optimised
A2 - parallel massive computations: ML + high performance computing
G2 - video transcoding or remote visualisations

Custom:
- Either 1 vCPU or an even number
- Up to 8Gb per vCPU
- Total memory must be a multiple of 256Gb

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13
Q

Compute Engine: Machine Types (predefined machine type families within General Purpose type)

A
  • Standard (balance of CPU and memory)
  • High memory (high memory to CPU ratio)
  • High CPU
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14
Q

Compute Engine: Machine Types (E2 series details within General Purpose type)

A
  • Designed for day-to-day computing at low cost
  • 2 to 32 vCPUs
  • Memory: from 0.5 GB to 128 GB
  • do not provide sustained use discounts
  • available on predefined AND custom machine types
  • shared core machine types
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15
Q

Compute Engine: Machine Types (N1 / N2 / N2D series details within General Purpose type)

A

N1 (first generation)
- 2 to 96 vCPUs
- Memory: from 0.95 GB to 624 GB
- offers TPU support and GPU support
- available on predefined AND custom machine types
- larger sustained use discount than N2

N2 (second generation more flexible)
- 2 to 80 vCPUs
- Memory: from 0.5 GB to 640 GB
- overall performance improvement over N1 machine types
- extended memory feature which offers per CPU software licencing cost control

N2D
- 2 to 224 vCPUs
- Memory: from 0.5 GB to 896 GB
- largest general purpose machine type
- available on predefined AND custom machine types
- helps avoid per CPU licencing
- higher memory to core ratios

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16
Q

Compute Engine: Machine Types (M1 / M2 series details within Memory-optimised type)

A
  • For ultra high memory workloads
  • used for in-memory analytics

M1
- 40 to 160 vCPUs
- Memory: from 32 GB to 3844 GB
- cannot use regional persistent disks
- only available on predefined machine types, not for custom

M2
- 40 to 160 vCPUs
- Memory: from 32 GB to 11776 GB
- cannot use regional persistent disks
- only available on predefined machine types, not for custom

17
Q

Compute Engine: Machine Types (E2 and N1 series common ground, Shared core, within General Purpose type)

A
  • for burstable workloads
  • are cost-effective
  • used with non-resource intensive applications

When workload bursts occur, additional CPUs are temporarily used (max 2 CPUs and 4Gb of memory):
E2
- micro
- core
- medium

N1
- f1-micro
- g1- small

18
Q

Compute Engine: Machine Types (GPUs available)

A

For graphic intensive workloads

  • NVIDIA Tesla K80
  • NVIDIA Tesla P4
  • NVIDIA Tesla T4
  • NVIDIA Tesla V100
  • NVIDIA Tesla P100
19
Q

VM Metadata and scripting

A
  • scripts can be created to use the metadata info of a VM to eg. auto start the VM or stop when something happens

Can move a VM to a new zone, but it needs to be stopped beforehand, also all the references to the VM will need to be manually updated
- VM can be moved automatically using gcloud:
gcloud compute instances move …
-VM can be manually moved
– all disk ‘templates’ need to be recreated in the new zone
– old disks need to be reattached to the new zone
– new VM needs to have a static IP
– change VM references
– delete original snapshots, disks and VM

20
Q

Snapshots

A
  • can be used for data recovery processes
  • for data migration between zones
  • for transferring data to a different disk type (eg to transfer data from an HDD disk to SSD)
  • snapshots are available on persistent disks only, not local SSD
  • used for incremental backups of data in the Cloud Storage (not visible in buckets but accessible using snapshot service)
  • cheaper than recreating a full image of a disk
  • not used for backing up metadata of VMs or tags
21
Q

Managing Instances

A
  • when the instance is running, it can be reset this is like a hard reset, all the data is wiped, only the settings remain
  • when the VM instance is Suspended or Stopped: you still pay for static IPs or persistent disk data; you also pay for the suspended CPU and memory service
  • when the VM is terminated: you don’t pay for the suspended CPU and memory service
22
Q

Shielded VM

A

Offer verifiable integrity of your compute engine VM instances, you can be sure your systems weren’t compromised by boot etc.

23
Q

Managing Instances: Boot process

A

Ensures you are not running a compromised system
1. Secure Boot (signatures are verified along with the certificates)
2. Virtual Trusted Platform Module (vTPM) - takes the measurements of the boot/start of the VM
3. Integrity Monitoring - compares the current boot info with the previous one, so it checks if there are any major changes in the way the VM started before vs how it started now

24
Q

Managing Instances: When the instance is Running

A
  1. Startup script is run - installs the guest environment packages, in the default mode, these are installed automatically using metadata
    Note: metadata propagates to all the instances within the project
  2. Ability to log into your instance using SSH / RDP: set up a firewall rule for TCP on port 22 (for Linux, i.e. SSH); OS login is RECOMMENDED by Google when logging into an instance; for RDP (Windows) set a firewall rule for TCP on port 3389, connect using RDP or powershell, can then login through and RDP chrome extension, you also need to select a Windows password
  3. Can modify/repair the instance like shown in the previous demo
  4. Live migration: migrate your instance such that you can change the host to a different zone but within the same region, basically you are sort of copying the instance. You can then do the maintenance on the “copy” without interrupting the VM.
25
Q

Connecting to a VM: using different login methods (SSH/RDP) - DEMO

A

Windows instance
1. Change the Machine type to e2-medium, as more power is needed for a Windows instance
2. Change the system to Windows, from Debian
3. Once the instance is created, set a password (three dots)
4. Create a firewall rule for TCP on port 3389
5. Save the External IP to log into the instance
6. RDP is already installed on Windows so search for Remote Desktop Connection, then paste the public IP
7. Asked for credentials: Input the username and password
8. Then a new Window opens, like I had at UCL when I wanted Stata. Here there is a Cloud SDK preinstalled - it is an example of the preinstalled guest environment

Using Powershell:
- a new firewall port must be open for TCP on 5986
5. Get the public IP, enter a command and that’s it.

Linux instance
1. Change the Machine type to e2-medium, as more power is needed for a Windows instance
2. Keep the system as Debian
3. Firewall rule for TCP on port 22
4. Can then click on the 3 dots and open in a new browser window
5. When you click on SSH for the first time a key pair is generated

Using OS login:
- relieves the complexity of managing many key pairs
1. In command prompt run: gcloud init
2. Reinitialising the configuration (selecting user, network, project zone etc)
3. Since the key pair is not auto generated here: ssh-keygen command will create one
4. Entering path where to save the key, create a passphrase
5. Go back to the Console, Edit the instance, scroll down to Custom Metadata and in the key type: enable-oslogin in the value: TRUE

NOTE: Block project-wide SSH keys - if checked, you cannot access the instance using one common SSH key, a separate one, stored in that project’s metadata would be needed to access this instance.

To enable OS login for all instances in the project:
- Compute Engine –> metadata –> key: enable-oslogin value: TRUE

26
Q

OS-login command on the Terminal + login

A

gcloud compute os-login ssh-keys add –key-file .ssh/id_rsa.pub

where the last bit is the path to the key

ssh -i .ssh/id_rsa kristina.abra@34.75.214.125

where the last bit is the public IP of the instance

27
Q

OS-login permission

A

If you are not the OWNER, you need the Compute OS login permission from the IAM part.

28
Q

Metadata and Startup Scripts

A

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