DevOps - GCP Commands Cheatsheet

# DevOps - GCP Commands Cheatsheet

## Table of Contents
=================
* [References](#references)
* [Other cheatsheets](#other-cheatsheets)
* [multiple gcloud config configurations](#multiple-gcloud-config-configurations)
    * [switch gcloud context with gcloud config](#switch-gcloud-context-with-gcloud-config)
* [auth](#auth)
* [info](#info)
* [projects](#projects)
* [zones](#zones)
* [billing](#billing)
* [IAM list permission and roles for a given resource](#iam-list-permission-and-roles-for-a-given-resource)
* [IAM service account](#iam-service-account)
    * [GCS bucket level](#gcs-bucket-level)
    * [Custom Roles](#custom-roles)
* [app engine](#app-engine)
* [cloud build](#cloud-build)
    * [Cloud build trigger GCE rolling replace/start](#cloud-build-trigger-gce-rolling-replacestart)
* [kms](#kms)
* [compute engine](#compute-engine)
    * [gcloud command for creating an instance?](#gcloud-command-for-creating-an-instance)
    * [list compute images](#list-compute-images)
    * [list an instance](#list-an-instance)
    * [move instance](#move-instance)
    * [ssh & scp](#ssh--scp)
    * [SSH via IAP](#ssh-via-iap)
    * [ssh port forwarding for elasticsearch](#ssh-port-forwarding-for-elasticsearch)
    * [ssh reverse port forwarding](#ssh-reverse-port-forwarding)
    * [generate ssh config](#generate-ssh-config)
    * [debugging](#debugging)
    * [instance level metadata](#instance-level-metadata)
    * [project level metadata](#project-level-metadata)
    * [instances, template, target-pool and instance group](#instances-template-target-pool-and-instance-group)
    * [MIG with startup and shutdown scripts](#mig-with-startup-and-shutdown-scripts)
    * [disk snapshot](#disk-snapshot)
    * [regional disk](#regional-disk)
* [Networking](#networking)
    * [network and subnets](#network-and-subnets)
    * [route](#route)
    * [firewall rules](#firewall-rules)
    * [layer 4 network lb](#layer-4-network-lb)
    * [layer 7 http lb](#layer-7-http-lb)
    * [forwarding-rules](#forwarding-rules)
    * [address](#address)
* [GCP managed ssl certificate](#gcp-managed-ssl-certificate)
* [StackDriver logging](#stackdriver-logging)
* [Service](#service)
    * [list service available](#list-service-available)
    * [Enable Service](#enable-service)
* [Client libraries you can use to connect to Google APIs](#client-libraries-you-can-use-to-connect-to-google-apis)
* [chaining gcloud commands](#chaining-gcloud-commands)
* [one liner to purge GCR images given a date](#one-liner-to-purge-gcr-images-given-a-date)
* [GKE](#gke)
* [Cloud Run](#cloud-run)
* [Machine Learning](#machine-learning)
* [Deployment Manager](#deployment-manager)

### References
* [have fun with them](https://cloudplatform.googleblog.com/2016/06/filtering-and-formatting-fun-with.html)
* [projections](https://cloud.google.com/sdk/gcloud/reference/topic/projections)
* [filters](https://cloud.google.com/sdk/gcloud/reference/topic/filters)
* [resource-keys](https://cloud.google.com/sdk/gcloud/reference/topic/resource-keys)
* [scripting-gcloud](https://cloud.google.com/sdk/docs/scripting-gcloud)
* [gcloud alpha interactive](http://cloudplatform.googleblog.com/2018/03/introducing-GCPs-new-interactive-CLI.html)
* https://medium.com/@Joachim8675309/getting-started-with-gcloud-sdk-part-1-114924737
* https://medium.com/@Joachim8675309/getting-started-with-gcloud-sdk-part-2-4d049a656f1a
* https://gist.github.com/bborysenko/97749fe0514b819a5a87611e6aea3db8

### Other cheatsheets
* https://github.com/dennyzhang/cheatsheet-gcp-A4

### multiple gcloud config configurations
* https://www.jhanley.com/google-cloud-understanding-gcloud-configurations/
* https://medium.com/infrastructure-adventures/working-with-multiple-environment-in-gcloud-cli-93b2d4e8cf1e

```
gcloud config configurations create pythonrocks
gcloud config configurations list
gcloud config configurations activate pythonrocks
gcloud config set core/account [email protected]
gcloud auth login
gcloud projects list
gcloud config set project mygcp-demo
```

### switch gcloud context with gcloud config
```
gcloud config list
gcloud config set account [email protected] 
gcloud config set project mygcp-demo
gcloud config set compute/region us-west1
gcloud config set compute/zone us-west1-a
alias demo='gcloud config set account [email protected] && gcloud config set project mygcp-demo && gcloud config set compute/region us-west1 && gcloud config set compute/zone us-west1-a'


cluster=$(gcloud config get-value container/cluster 2> /dev/null)
zone=$(gcloud config get-value compute/zone 2> /dev/null)
project=$(gcloud config get-value core/project 2> /dev/null)

# switch project based on the name
gcloud config set project $(gcloud projects list --filter='name:wordpress-dev' --format='value(project_id)')

```

```
command -v gcloud >/dev/null 2>&1 || { \
 echo >&2 "I require gcloud but it's not installed.  Aborting."; exit 1; }

REGION=$(gcloud config get-value compute/region)
if [[ -z "${REGION}" ]]; then
    echo "https://cloud.google.com/compute/docs/regions-zones/changing-default-zone-region" 1>&2
    echo "gcloud cli must be configured with a default region." 1>&2
    echo "run 'gcloud config set compute/region REGION'." 1>&2
    echo "replace 'REGION' with the region name like us-west1." 1>&2
    exit 1;
fi

```

### auth
```
gcloud auth list
gcloud auth login
gcloud auth activate-service-account --key-file=sa_key.json
```

kubectl uses OAuth token generated by 
* `gcloud config config-helper --format json`
* `gcloud config config-helper --format='value(credential.access_token)'`
* `gcloud auth print-access-token` generates new token


### info
```
gcloud info --format flattened
export PROJECT=$(gcloud info --format='value(config.project)')
```

### projects

```
# various way to get project_id
PROJECT_ID=$(gcloud config get-value core/project 2>/dev/null)
PROJECT_ID=$(gcloud config list project --format='value(core.project)')
PROJECT_ID=$(gcloud info --format='value(config.project)')

# get project_number given project_id or name
gcloud projects list --filter="project_id:${PROJECT_ID}"  --format='value(project_number)'
gcloud projects list --filter="name:${project_name}"  --format='value(project_number)'
```

### zones & regions
To return a list of zones given a region
```
gcloud compute zones list --filter=region:us-central1
```
```
# list regions
gcloud compute regions list
```

### billing
```
gcloud beta billing accounts list
gcloud organizations list
```

### IAM list permission and roles for a given resource
```
gcloud iam list-testable-permissions <uri>
e.g gcloud iam list-testable-permissions //cloudresourcemanager.googleapis.com/projects/$PROJECT_ID

gcloud iam list-grantable-roles <uri>
e.g. 
gcloud iam list-grantable-roles //cloudresourcemanager.googleapis.com/projects/$PROJECT_ID
gcloud iam list-grantable-roles https://www.googleapis.com/compute/v1/projects/$PROJECT_ID/zones/us-central1-a/instances/iowa1

# get uri e.g.
gcloud projects list --uri
```

### IAM service account

```
export SA_EMAIL=$(gcloud iam service-accounts list \
    --filter="displayName:jenkins" --format='value(email)')
export PROJECT=$(gcloud info --format='value(config.project)')

# creaate and list sa
gcloud iam service-accounts create jenkins --display-name jenkins
gcloud iam service-accounts list
gcloud iam service-accounts list   --filter='email ~ [0-9]*-compute@.*'   --format='table(email)'

# create & list sa key  
gcloud iam service-accounts keys create jenkins-sa.json --iam-account $SA_EMAIL    
gcloud iam service-accounts keys list --iam-account=vault-admin@<project_id>.iam.gserviceaccount.com

## project level: get a list of roles assigned to a given sa such as terraform
 gcloud projects get-iam-policy ${PROJECT_ID} --flatten="bindings[].members" --filter="bindings.members:serviceAccount:terraform@${PROJECT_ID}.iam.gserviceaccount.com"

# project level: grant roles to a given sa
gcloud projects get-iam-policy $PROJECT
gcloud projects add-iam-policy-binding $PROJECT  --role roles/storage.admin \
    --member serviceAccount:$SA_EMAIL
gcloud projects add-iam-policy-binding $PROJECT --role roles/compute.instanceAdmin.v1 \
    --member serviceAccount:$SA_EMAIL
gcloud projects add-iam-policy-binding $PROJECT --role roles/compute.networkAdmin \
    --member serviceAccount:$SA_EMAIL
gcloud projects add-iam-policy-binding $PROJECT --role roles/compute.securityAdmin \
    --member serviceAccount:$SA_EMAIL
gcloud projects add-iam-policy-binding $PROJECT --role roles/iam.serviceAccountActor \
    --member serviceAccount:$SA_EMAIL
```
* [When granting IAM roles, you can treat a service account either as a resource or as an identity](https://cloud.google.com/iam/docs/granting-roles-to-service-accounts)

```
# service account level: add role to service account
gcloud iam service-accounts get-iam-policy <sa_email>
gcloud iam service-accounts add-iam-policy-binding [email protected] --member='serviceAccount:[email protected]' --role='roles/iam.serviceAccountActor'
```
* https://cloud.google.com/iam/docs/creating-short-lived-service-account-credentials
* https://medium.com/@tanujbolisetty/gcp-impersonate-service-accounts-36eaa247f87c
* https://medium.com/wescale/how-to-generate-and-use-temporary-credentials-on-google-cloud-platform-b425ef95a00d
* https://cloud.google.com/iam/credentials/reference/rest/v1/projects.serviceAccounts/generateAccessToken shows the lifetime of the OAuth token of 3600 seconds by default

```
# user:[email protected] impersonate as a svc account terraform@${PROJECT_ID}.iam.gserviceaccount.com
gcloud iam service-accounts add-iam-policy-binding  terraform@${PROJECT_ID}.iam.gserviceaccount.com --member=user:[email protected] --role roles/iam.serviceAccountTokenCreator
gcloud container clusters list --impersonate-service-account=terraform@${PROJECT_ID}.iam.gserviceaccount.com
```

### GCS bucket level
```
COMPUTE_ENGINE_SA_EMAIL=$(gcloud iam service-accounts list --filter="name:Compute Engine default service account" --format "value(email)")
gsutil iam ch serviceAccount:${COMPUTE_ENGINE_SA_EMAIL}:objectViewer gs://bucket-name
```

### Custom Roles
```
# list predefined roles
gcloud iam roles list
# list custom roles
gcloud iam roles list --project $PROJECT_ID

# create custom role in the following 2 ways, either on project level (--project [PROJECT_ID]) or org level (--organization [ORGANIZATION_ID])
1. gcloud iam roles create editor --project $PROJECT_ID --file role-definition.yaml
2. gcloud iam roles create viewer --project $PROJECT_ID --title "Role Viewer" --description "Custom role description." --permissions compute.instances.get,compu
te.instances.list --stage ALPHA
```

### app engine
* https://medium.com/google-cloud/app-engine-project-cleanup-9647296e796a

## cloud build 

```
# user defined
gcloud builds submit --config=cloudbuild.yaml --substitutions=_BRANCH_NAME=foo,_BUILD_NUMBER=1 .

# override built in TAG_NAME
gcloud builds submit --config=cloudbuild.yaml --substitutions=TAG_NAME=v1.0.1
```

### Cloud build trigger GCE rolling replace/start
* https://medium.com/google-cloud/continuous-delivery-in-google-cloud-platform-cloud-build-with-compute-engine-a95bf4fd1821
* https://cloud.google.com/compute/docs/instance-groups/updating-managed-instance-groups#performing_a_rolling_replace_or_restart

```
steps:
- name: 'gcr.io/cloud-builders/docker'
  args: [ 'build', '-t', 'gcr.io/$PROJECT_ID/gcp-cloudbuild-gce-angular', '.' ]
- name: 'gcr.io/cloud-builders/gcloud'
  args: [ 'beta', 'compute', 'instance-groups', 'managed', 'rolling-action', 'restart', 'gce-angular-instance-group', '--zone=us-east1-b' ]
images:
- 'gcr.io/$PROJECT_ID/gcp-cloudbuild-gce-angular'

```

### kms
* [cloud-encrypt-with-kms](https://codelabs.developers.google.com/codelabs/cloud-encrypt-with-kms/#0)
* [Integrated with cloud build](https://cloud.google.com/cloud-build/docs/securing-builds/use-encrypted-secrets-credentials)

```
# list all keyrings 
gcloud kms keyrings list --location global
# list all keys in my_key_ring
gcloud kms keys list --keyring my_key_ring --location global

# grant KMS IAM permission to a sv account $USER_EMAIL 
gcloud kms keyrings add-iam-policy-binding $KEYRING_NAME \
    --location global \
    --member user:$USER_EMAIL \
    --role roles/cloudkms.admin
gcloud kms keyrings add-iam-policy-binding $KEYRING_NAME \
    --location global \
    --member user:$USER_EMAIL \
    --role roles/cloudkms.cryptoKeyEncrypterDecrypter
    
# Encrypt and Decrypt in REST API
curl -v "https://cloudkms.googleapis.com/v1/projects/$DEVSHELL_PROJECT_ID/locations/global/keyRings/$KEYRING_NAME/cryptoKeys/$CRYPTOKEY_NAME:encrypt" \
  -d "{\"plaintext\":\"$PLAINTEXT\"}" \
  -H "Authorization:Bearer $(gcloud auth application-default print-access-token)"\
  -H "Content-Type:application/json" \
| jq .ciphertext -r > 1.encrypted

curl -v "https://cloudkms.googleapis.com/v1/projects/$DEVSHELL_PROJECT_ID/locations/global/keyRings/$KEYRING_NAME/cryptoKeys/$CRYPTOKEY_NAME:decrypt" \
  -d "{\"ciphertext\":\"$(cat 1.encrypted)\"}" \
  -H "Authorization:Bearer $(gcloud auth application-default print-access-token)"\
  -H "Content-Type:application/json" \
| jq .plaintext -r | base64 -d    
```
### compute engine

#### gcloud command for creating an instance? 
from web console
```
gcloud compute instances create [INSTANCE_NAME] \
  --image-family [IMAGE_FAMILY] \
  --image-project [IMAGE_PROJECT] \
  --create-disk image=[DISK_IMAGE],image-project=[DISK_IMAGE_PROJECT],size=[SIZE_GB],type=[DISK_TYPE]
  
gcloud compute instances create micro1 --zone=us-west1-a --machine-type=f1-micro --subnet=default --network-tier=PREMIUM --maintenance-policy=MIGRATE --service-account=398028291895-compute@developer.gserviceaccount.com --scopes=https://www.googleapis.com/auth/devstorage.read_only,https://www.googleapis.com/auth/logging.write,https://www.googleapis.com/auth/monitoring.write,https://www.googleapis.com/auth/servicecontrol,https://www.googleapis.com/auth/service.management.readonly,https://www.googleapis.com/auth/trace.append --min-cpu-platform=Automatic --image=debian-9-stretch-v20180510 --image-project=debian-cloud --boot-disk-size=10GB --boot-disk-type=pd-standard --boot-disk-device-name=micro1
```

#### list compute images
```
gcloud compute images list --filter=name:debian --uri
https://www.googleapis.com/compute/v1/projects/debian-cloud/global/images/debian-8-jessie-v20180109
https://www.googleapis.com/compute/v1/projects/debian-cloud/global/images/debian-9-stretch-v20180105

# Use the following command to see available non-Shielded VM Windows Server images
gcloud compute images list --project windows-cloud --no-standard-images
# Use the following command to see a list of available Shielded VM images, including Windows images
gcloud compute images list --project gce-uefi-images --no-standard-images
```

#### list an instance 
* [filters](https://cloud.google.com/sdk/gcloud/reference/topic/filters)
* [resource-keys](https://cloud.google.com/sdk/gcloud/reference/topic/resource-keys)

```
gcloud compute instances list --filter="zone:us-central1-a"
gcloud compute instances list --project=dev --filter="name~^es"
gcloud compute instances list --project=dev --filter=name:kafka --format="value(name,INTERNAL_IP)"
gcloud compute instances list --filter=tags:kafka-node
gcloud compute instances list --filter='machineType:g1-small'
```

#### move instance
`gcloud compute instances move <instance_wanna_move> --destination-zone=us-central1-a --zone=us-central1-c`

#### ssh & scp
```
#--verbosity=debug is great for debugging, showing the SSH command 
# the following is a real word example for running a bastion server that talks to a GKE cluster (master authorized network)
gcloud compute ssh --verbosity=debug <instance_name> --command "kubectl get nodes"

gcloud compute scp  --recurse ../manifest <instance_name>:
```

#### SSH via IAP
* https://cloud.google.com/iap/docs/using-tcp-forwarding

```
# find out access-config-name's name
gcloud compute instances describe oregon1
# remove the external IP
gcloud compute instances delete-access-config  oregon1 --access-config-name "External NAT"
# connect via IAP, assuming the IAP is granted to the account used for login. 
gcloud beta compute ssh oregon1 --tunnel-through-iap
```
#### ssh port forwarding for elasticsearch
```
gcloud compute --project "foo" ssh --zone "us-central1-c" "elasticsearch-1"  --ssh-flag="-L localhost:9200:localhost:9200"
```
The 2nd `localhost` is relative to  elasticsearch-1`

#### ssh reverse port forwarding 
for example, how to connect to home server's flask server (tcp port 5000) for a demo or a local game server in development
```
GOOGLE_CLOUD_PROJECT=$(gcloud config get-value project)
gcloud compute --project "${GOOGLE_CLOUD_PROJECT}" ssh --zone "us-west1-c" --ssh-flag="-v -N -R :5000:localhost:5000" "google_cloud_bastion_server"
```

#### generate ssh config 
```
gcloud compute config-ssh
```

#### Windows RDP reset windows password
returns the IP and password for creating the RDP connection. 
```
gcloud compute reset-windows-password qa-iceberg-instance --user=jdoe

ip_address: 104.199.119.166
password:   Ks(;_gx7Bf2d.NP
username:   jode
```



#### debugging
gcloud debugging: `gcloud  compute instances list --log-http`
[serial port debug](https://cloud.google.com/compute/docs/instances/interacting-with-serial-console)


#### instance level metadata
```
curl -s "http://metadata.google.internal/computeMetadata/v1/instance/?recursive=true&alt=text" -H "Metadata-Flavor: Google"
leader=$(curl -s "http://metadata.google.internal/computeMetadata/v1/instance/attributes/leader" -H "Metadata-Flavor: Google")
```

### project level metadata
```
gcloud compute project-info describe
gcloud compute project-info describe --flatten="commonInstanceMetadata[]"
```

#### instances, template, target-pool and instance group
```
cat << EOF > startup.sh
#! /bin/bash
apt-get update
apt-get install -y nginx
service nginx start
sed -i -- 's/nginx/Google Cloud Platform - '"\$HOSTNAME"'/' /var/www/html/index.nginx-debian.html
EOF

gcloud compute instance-templates create nginx-template  --metadata-from-file startup-script=startup.sh
gcloud compute target-pools create nginx-pool
gcloud compute instance-groups managed create nginx-group \
         --base-instance-name nginx \
         --size 2 \
         --template nginx-template \
         --target-pool nginx-pool
```

#### MIG with startup and shutdown scripts
https://cloud.google.com/vpc/docs/special-configurations#multiple-natgateways

```
gsutil cp gs://nat-gw-template/startup.sh .

gcloud compute instance-templates create nat-1 \
    --machine-type n1-standard-2 --can-ip-forward --tags natgw \
    --metadata-from-file=startup-script=startup.sh --address $nat_1_ip

gcloud compute instance-templates create nat-2 \
    --machine-type n1-standard-2 --can-ip-forward --tags natgw \
    --metadata-from-file=startup-script=startup.sh  --address $nat_2_ip
```
#### disk snapshot
```
gcloud compute disks snapshot kafka-data1-1 --async --snapshot-names=kafka-data-1 --project project_a --zone us-west1-a
Use [gcloud compute operations describe URI] command to check the status of the operation(s).
```

#### regional disk
```
 gcloud beta compute instance attach-disk micro1 --disk pd-west1 --disk-scope regional
```


### Networking

#### network and subnets
```
 gcloud compute networks create privatenet --subnet-mode=custom
 gcloud compute networks subnets create privatesubnet-us --network=privatenet --region=us-central1 --range=172.16.0.0/24
 gcloud compute networks subnets create privatesubnet-eu --network=privatenet --region=europe-west1 --range=172.20.0.0/20
 gcloud compute networks subnets list --sort-by=NETWORK
```

#### route
tag the instances with `no-ips`

```
gcloud compute instances add-tags existing-instance --tags no-ip
gcloud compute routes create no-ip-internet-route \
    --network custom-network1 \
    --destination-range 0.0.0.0/0 \
    --next-hop-instance nat-gateway \
    --next-hop-instance-zone us-central1-a \
    --tags no-ip --priority 800
```
#### firewall rules
* https://medium.com/@swongra/protect-your-google-cloud-instances-with-firewall-rules-69cce960fba

```
# allow SSH, RDP and ICMP for the given network
gcloud compute firewall-rules create managementnet-allow-icmp-ssh-rdp --direction=INGRESS --priority=1000 --network=managementnet --action=ALLOW --rules=tcp:22,3389,icmp --source-ranges=0.0.0.0/0
# allow internal from given source range
gcloud compute firewall-rules create mynetwork-allow-internal --network \
mynetwork --action ALLOW --direction INGRESS --rules all \
--source-ranges 10.128.0.0/9
gcloud compute firewall-rules list --filter="network:mynetwork"

## DENY
gcloud compute firewall-rules create mynetwork-deny-icmp \
--network mynetwork --action DENY --direction EGRESS --rules icmp \
--destination-ranges 10.132.0.2 --priority 500
gcloud compute firewall-rules list \
--filter="network:mynetwork AND name=mynetwork-deny-icmp"

# sort-by
gcloud compute firewall-rules list --sort-by=NETWORK

```

#### layer 4 network lb
```
gcloud compute firewall-rules create www-firewall --allow tcp:80
gcloud compute forwarding-rules create nginx-lb \
         --region us-central1 \
         --ports=80 \
         --target-pool nginx-pool
         
gcloud compute firewall-rules list --sort-by=NETWORK

```

#### layer 7 http lb
* https://cloud.google.com/solutions/scalable-and-resilient-apps

```
gcloud compute http-health-checks create http-basic-check
gcloud compute instance-groups managed \
       set-named-ports nginx-group \
       --named-ports http:80

gcloud compute backend-services create nginx-backend \
      --protocol HTTP --http-health-checks http-basic-check --global
      
gcloud compute backend-services add-backend nginx-backend \
    --instance-group nginx-group \
    --instance-group-zone us-central1-a \
    --global  

gcloud compute url-maps create web-map \
    --default-service nginx-backend

gcloud compute target-http-proxies create http-lb-proxy \
    --url-map web-map
    
gcloud compute forwarding-rules create http-content-rule \
        --global \
        --target-http-proxy http-lb-proxy \
        --ports 80
gcloud compute forwarding-rules list

```

#### forwarding-rules
```
gcloud compute forwarding-rules list --filter=$(dig +short <dns_name>)
gcloud compute forwarding-rules describe my-forwardingrule --region us-central1
gcloud compute forwarding-rules describe my-http-forwardingrule --global
```

#### address
```
# get the external IP address of the instance
gcloud compute instances describe single-node \
     --format='value(networkInterfaces.accessConfigs[0].natIP)
     
gcloud compute addresses describe https-lb --global --format json

# list all IP addresses
gcloud projects list --format='value(project_id)' | xargs -I {} gcloud compute addresses list --format='value(address)' --project {}  2>/dev/null | sort | uniq -c
```



### GCP managed ssl certificate
```
gcloud beta compute ssl-certificates create example-mydomain --domains example.mydomain.com
gcloud beta compute ssl-certificates list
gcloud beta compute ssl-certificates describe example-mydomain
# It takes 30mins+ to provision the TLS, one of conditions is the target-https-proxies needs to be associated with the cert.
gcloud beta compute target-https-proxies list
```


### StackDriver logging
```
gcloud logging read "timestamp >= \"2018-04-19T00:30:00Z\"  and logName=projects/${project_id}/logs/requests and resource.type=http_load_balancer" --format="csv(httpRequest.remoteIp,httpRequest.requestUrl,timestamp)" --project=${project_id}
```

### Service

#### list service available

`gcloud services list --available`

#### Enable Service 

```
# chain 
gcloud services enable cloudapis.googleapis.com && \
cloudresourcemanager.googleapis.com && \
compute.googleapis.com 

# or not chain
gcloud services enable container.googleapis.com
gcloud services enable containerregistry.googleapis.com
gcloud services enable cloudbuild.googleapis.com
gcloud services enable iam.googleapis.com
gcloud services enable logging.googleapis.com
gcloud services enable monitoring.googleapis.com
gcloud services enable storage-api.googleapis.com
gcloud services enable storage-component.googleapis.com
gcloud services enable sourcerepo.googleapis.com
```

```
function enable-service() {
  SERVICE=$1
  if [[ $(gcloud services list --format="value(serviceConfig.name)" \
                                --filter="serviceConfig.name:$SERVICE" 2>&1) != \
                                "$SERVICE" ]]; then
    echo "Enabling $SERVICE"
    gcloud services enable $SERVICE
  else
    echo "$SERVICE is already enabled"
  fi
}

enable-service container.googleapis.com
```

### Client libraries you can use to connect to Google APIs
* https://medium.com/google-cloud/simple-google-api-auth-samples-for-service-accounts-installed-application-and-appengine-da30ee4648


### chaining gcloud commands
```
gcloud compute forwarding-rules list --format 'value(NAME)' \
| xargs -I {}  gcloud compute forwarding-rules delete {}  --region us-west1 -q

gcloud projects list --format='value(project_id)' \
| xargs -I {} gcloud compute addresses list --format='value(address)' --project {}  2>/dev/null | sort | uniq -c

gcloud compute instances list --filter=elasticsearch --format='value(NAME)' \
| xargs -I {} -p gcloud compute instances stop {}
gcloud compute instances list --filter=elasticsearch --format='value(INTERNAL_IP)' \
| xargs -I {} ssh {} "sudo chef-client"

# delete non default routes
gcloud compute routes list --filter="NOT network=default" --format='value(NAME)' \
| xargs -I {} gcloud compute routes delete -q {}
```

### one liner to purge GCR images given a date
```
DATE=2018-10-01
IMAGE=<project_id>/<image_name>
gcloud container images list-tags gcr.io/$IMAGE --limit=unlimited --sort-by=TIMESTAMP   \
--filter="NOT tags:* AND timestamp.datetime < '${DATE}'" --format='get(digest)' | \
while read digest;do gcloud container images delete -q --force-delete-tags gcr.io/$IMAGE@$digest ;done
```
### GKE
```
# create a private cluster
gcloud beta container clusters create private-cluster \
    --private-cluster \
    --master-ipv4-cidr 172.16.0.16/28 \
    --enable-ip-alias \
    --create-subnetwork ""


gcloud compute networks subnets create my-subnet \
    --network default \
    --range 10.0.4.0/22 \
    --enable-private-ip-google-access \
    --region us-central1 \
    --secondary-range my-svc-range=10.0.32.0/20,my-pod-range=10.4.0.0/14

gcloud beta container clusters create private-cluster2 \
    --private-cluster \
    --enable-ip-alias \
    --master-ipv4-cidr 172.16.0.32/28 \
    --subnetwork my-subnet \
    --services-secondary-range-name my-svc-range \
    --cluster-secondary-range-name my-pod-range
 
 gcloud container clusters update private-cluster2 \
    --enable-master-authorized-networks \
    --master-authorized-networks <external_ip_of_kubectl_instance>
```

```
# create a GKE cluster with CloudRun,Istio, HPA enabled
gcloud beta container clusters create run-gke \
  --addons HorizontalPodAutoscaling,HttpLoadBalancing,Istio,CloudRun \
  --scopes cloud-platform \
  --zone us-central1-a \
  --machine-type n1-standard-4 \
  --enable-stackdriver-kubernetes \
  --no-enable-ip-alias
```


```
# create a VPC native cluster
gcloud container clusters create k1 \
--network custom-ip-vpc --subnetwork subnet-alias \
--enable-ip-alias --cluster-ipv4-cidr=/16   --services-ipv4-cidr=/22
```

```
# get the GKE endpoint
gcloud container clusters describe mycluster --format='get(endpoint)'
```

```
# generate a ~/.kube/config for private cluster with private endpoint
gcloud container clusters get-credentials private-cluster --zone us-central1-a --internal-ip
```

### Cloud Run
```
# deploy a service on Cloud Run in us-central1 and allow unauthenticated user
gcloud beta run deploy --image gcr.io/${PROJECT-ID}/helloworld --platform managed --region us-central1 --allow-unauthenticated

# list services
gcloud beta run services list
# get endpoint url for a service
gcloud beta run services describe <service_name> --format="get(status.url)"
```


### Machine Learning
```
brew install bat
gcloud ml language analyze-entities --content="Michelangelo Caravaggio, Italian painter, is known for 'The Calling of Saint Matthew'." | bat  -l json
```

### Deployment Manager
* https://cloud.google.com/sdk/gcloud/reference/deployment-manager/deployments/
Play with the commands for preview and cancel-preview.