Key Facts for Google Cloud Platform Engineer

Key Facts for Google Cloud Platform Engineer – These are key facts and concepts around Google Cloud Platform Cloud Engineering and will help in a quick revision for your Google Associate Cloud Engineer Study. 

1. The command – line command to create a Cloud Storage bucket is gsutil mb, where gsutil is command line for accessing and manipulating Cloud Storage from command line. mb is the specific command for creating, or making, a bucket.
2. Adding Virtual Machines to an instance group can be triggered in an autoscaling policy by all of the following :
   • CPU Utilisation 
   • Stackdriver metrics
   • Load balancing serving capacity
3. Datastore options in GCP for transactions and the ability to perform relational database operations using fully complinat SQL data store – Spanner & Cloud SQL
4. Instance templates are used to create a group of identical VMs. The instance templates include the following configuration parameters or attributes of a
   1. VM
   2. Machine Type
   3. Boot Disk image
   4. Container Image
   5. Zone
   6. Labels.
5. The most efficient way to implement an object management policy via administrators that requires ojects stored in Cloud Storage to be migrated from regional storage to enearline storage 90 days after the object is created is via lifecycle management configuration policy specifying an age of 90 days and SetStorageClass as nearline.
6. Command to synchronize the contents of the two buckets gsutil rsync.
7. All of the following are components of firewall rules a.) direction of traffic, b.) priority c.) action on match d.) enforcement status e.) target f.) source g.) protocol
8. VPC’s are global resources and subnets are regional resources.
9. Web application – deployment but does not want to manage managed servers or clusters. A good option is a PaaS – App Engine.
10. Data warehouse needing SQL query capabilities over petabytes of data but with no manage servers or clusters, such requirements can be met by Big Query.
11. Internet of Things space, will stream large volumes of data into GCp. The data needs to be filtered, transformed and analysed before being stored in GCP Datastore. — Cloud Dataflow.
12. Cloud Dataflow allows for stream and batch processing of data and is well suited for ETL work.
13. Dataproc is a managed Hadoop and Spark service thiat is used for big data analysics
14. Buckets, directories and subdirectories are used to organise storage
15. gcloud is the command line tool for IAM and list-grantable-roles will list roles granted to a resource, gcloud iam list-grantable-roles <resource>
16. Cloud Endpoints is an API Service
17. Cloud Interconnect is a network service.
18. Compute Engine Virtual Machine is a zonal resource.
19. Within the Zonal & Regional scope, GCP geographic scopes are network latencies generally less than 1 millisecond.
20. To create a custom role, a user must possess iam.roles.create
21. Project is the base-level organizing entity for creating and using GCP resources and services.
22. Organisations, folders and projects are the components used to manage an organizational hierarchy.
23. gcloud compute regions describe, gets a list of all CPU types available in a particular zone.
24. Cloud Function responds to events in Cloud Storage, making them a good choice for taking actiona after a file is loaded
25. Billing is setup at the Project level in the GCP resource hierarchy.
26. Cloud Dataproc is the managed Spark Service
27. Cloud Dataflow is for stream and processing
28. Rate Quotas resets at regular intervals.
29. There are two types of quotas in billing, Rate Quotas and Allocation Quotas.
30. In Kubernetes Engine, a node pool is a subset of node instances within a cluster that all have the same configuration.
31. Code for Cloud Functions can be written in Node.js and Python
32. Preemptible virtual machines may be shutdown at any time but will always be shut down after running for 24 hours.
33. After deciding to use Cloud Key Management Services and before you can start to create cryptographic keys you must enable KMS Api (Google Cloud Key Management Service) and setup billing.
34. GCP Service for storing and managing Docker containers is Container Registry.
35. You must verify the project selected is the one you want to work with, once you have opened the GCP console at console.google.com before performing task on VM’s. All operations you perform apply to resoures in the identified project.
36. One time task you will need to complete before using the console is setting up the billing. You will be able to create the project only if the billing is enabled.
37. A name for VM, machine type, a region and a zone are minimal set of info you will need while creating a VM.
38. Different zones may have different machine types available.
39. Billing of different departments for the cost of VM’s used for their applications is possible with labels and descriptions.
40. Google Cloud Interconnect – Dedicated is used to provide a dedicated connection between customer’s data center and a Google data center
41. Purpose of instance groups in a Kubernetes cluster is to create sets of VM’s that can be managed as a unit.
42. A Kubernetes cluster has a single cluster master and one or more nodes to execute workloads.
43. A pod is a single instance of a running process in a cluster
44. To ensure applications calling Kubernetes services
45. ReplicaSets are controllers that are responsible for maintaining the correct number of pods.
46. Deployments are versions of application code running on a cluster. 
47. To maintain availability even if there is a major network outage in a data center, Multizone/multiregion clusters are available in Kubernetes Engine and are used to provide resiliency to an application
48. Starting with an existing template, filling in parameters, and generating the gcloud command is the most reliable way to deploy a Kubernetes cluster with GPUs.
49. gcloud beta container clusters create ch07-cluster-1 –num-nodes=4 will create a cluster named ch07-cluster-1 with four nodes.
50.  Application name, container image, and initial command can all be specified when using create deployment from cloud console when creating a deployment from cloud console. Time to Live (TTL) is not specified and not an attribute of deployments.
51. Deployment configuration files created in Cloud Console use YAML format.
52. When working on a Kubernetes Engine a cloud engineer may need to configure, Nodes, Pods, services, clusters and container images.
53. After observing performance degradation, inorder to see details of a specific cluster, after opening Cloud Console, Click the cluster name to see details of a specific cluster.
54. You can find the number of vCPUS on the cluster listing in the Total Cores column or on the Details Page in the Node Pool section in the size parameter.
55. High level characteristics of a cluster — gcloud container clusters list
56. gcloud container clusters get-credentials is the correct command to configure kubectl to use GCP credentials for the cluster.
57. Clicking Edit button allows you to change, add, or remove labels from the Kubernetes cluser.
58. When resizing, the gcloud container clusteres resize command requires the name of the cluster,size and the node pool to modify.
59. Pods are used to implement replicas of a deployment, and it is best practice to modify deployments which are configured with a specification of the number of replicas that should always run. 
60. In the Kubernetes Engine Navigation menu, you would select Workloads inorder to see a list of deployments.
61. 4 actions available for deployments is Autoscale, Expose, Rolling Update and Scale.
62. Command to list deployments is kubectl get deployments
63. You can specify container image, cluster name and application name along with the labels, initial command and namespace. 
64. The Deployment Details page includes services.
65. kubetcl run command is used to start a deployment. It takes name for the deployment, image & port.
66. Command for service not functioning as expected and needs to be removed from the cluster — kubectl delete service m1-classfied
67. Container Registry is the service for managing images that can be used in other services like Kubernetes Engine and Compute Engine.
68. gcloud container images list  — is to list container images in the command line. 
69. gcloud container images describe — to get  a detailed description of each containers
70. kubectl expose deployment — makes a service accessible.
71. Autoscaling is the most cost-effective and least burdensome way to respond to changes in demand for a service.
72. Incase a remote component in your network has failed, which results ina transient network error, when you submit a gsutil command, it fails because of a transient error, by default the command will retry using a truncated binary exponential back-off strategy. This strategy is as follows, gsutil will retry using a truncated binary exponential backoff strategy:

• • Wait a random period between [0..1] seconds and retry;
  • If that fails, wait a random period between [0..2] seconds and retry;
  • If that fails, wait a random period between [0..4] seconds and retry;
  • And so on, up to a configurable maximum number of retries (default = 23),with each retry period bounded by a configurable maximum period of time (default = 60 seconds).