// BookStatus describles status of Book
type BookStatus int

// BookStatus contants
const (
    BookStatusUnpublished BookStatus = 1 << iota
    BookStatusPublished
    BookStatusDiscontinued
)

// Book is sample model.
type Book struct {
    Title       string
    Price       int
    Category    string
    Status      BookStatus
}

// Book is sample model.
type Book struct {
    Title       string
    Price       int
    Category    string
    Status      BookStatus
    IsPublished bool // 追加
}

    // Book保存時に派生プロパティを補完
    book.IsPublished = book.Status == BookStatusPublished

    // 派生プロパティに対してフィルタして検索
    var books []Book
    _, err := datastore.NewQuery("Book").Filter("IsPublished =", false).GetAll(ctx, &books)

// Book is sample model.
type Book struct {
    Title       string
    Price       int
    Category    string
    Status      BookStatus
    IsPublished bool
    IsHobby     bool // 追加
}

    // Book保存時に派生プロパティを補完
    book.IsHobby = book.Category == "sports" || book.Category == "cooking"

    // 派生プロパティに対してフィルタして検索
    var books []Book
    _, err := datastore.NewQuery("Book").Filter("IsHobby =", true).GetAll(ctx, &books)

// Book is sample model.
type Book struct {
    Title         string
    Price         int
    Category      string
    Status        BookStatus
    StatusORIndex []int // 追加
    IsPublished   bool
    IsHobby       bool
}

    // book.Statusを含むOR条件組み合わせを全て保存しておく
    for j := 1; j < 1<<uint(len(BookStatuses))+1; j++ {
        if j&int(book.Status) != 0 {
            book.StatusORIndex = append(book.StatusORIndex, j)
        }
    }

    // Status IN (BookStatusUnpublished, BookStatusPublished)で検索
    var books []Book
    _, err := datastore.NewQuery("Book").Filter("StatusORIndex =", BookStatusUnpublished|BookStatusPublished).GetAll(ctx, &books)

// Book is sample model.
type Book struct {
    Title         string
    Price         int
    PriceRange    string // 追加
    Category      string
    Status        BookStatus
    StatusORIndex []int
    IsPublished   bool
    IsHobby       bool
}

    switch {
    case book.Price < 3000:
        book.PriceRange = "p<3000"
    case book.Price < 5000:
        book.PriceRange = "3000<=p<5000"
    case book.Price < 10000:
        book.PriceRange = "5000<=p<10000"
    default:
        book.PriceRange = "10000<=p"
    }

    // 5000円以上〜10000円未満で検索
    var books []Book
    _, err := datastore.NewQuery("Book").Filter("PriceRange =", "5000<=p<10000").GetAll(ctx, &books)

// Book is sample model.
type Book struct {
    Title         string
    TitleIndex    []string // 追加
    Price         int
    PriceRange    string
    Category      string
    Status        BookStatus
    StatusORIndex []int
    IsPublished   bool
    IsHobby       bool
}

    // Book保存時に派生プロパティを補完
    book.TitleIndex = biunigrams(book.Title)

    q := datastore.NewQuery("Book")

    if runeLen := utf8.RuneCountInString(title); runeLen == 1 {
        // パラメータが1文字の場合はunigramで検索
        q = q.Filter("TitleIndex =", title)
    } else if runeLen > 1 {
        // パラメータが2文字以上の場合はbigramで検索
        for _, gram := range bigrams(title) {
            q = q.Filter("TitleIndex =", gram)
        }
    }

    var books []Book
    _, err := q.GetAll(ctx, &books)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

datastore.NewQuery(kind).Filter("Hoge>=", hoge).Filter("Hoge<", hoge+"\ufffd").GetAll(ctx, &fuga)

// Book is sample model.
type Book struct {
    Title         string
    TitleIndex    []string
    TitlePrefix   []string // 追加
    Price         int
    PriceRange    string
    Category      string
    Status        BookStatus
    StatusORIndex []int
    IsPublished   bool
    IsHobby       bool
}

    // Book保存時に派生プロパティを補完
    book.TitleIndex = biunigrams(book.Title)
    book.TitlePrefix = prefixes(book.Title)

    var books []Book
    _, err := datastore.NewQuery("Book").Filter("TitlePrefix =", strings.ToLower(title)).GetAll(ctx, &books)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

# プロジェクトのリストを表示
$ gcloud projects list
# プロジェクトの切り替え
$ gcloud config set project PROJECT_ID

function _gcloud_change_project() {
  local proj=$(gcloud projects list | fzf --header-lines=1 | awk '{print $1}')
  if [ -n $proj ]; then
    gcloud config set project $proj
    return $?
  fi
}
alias gcp=_gcloud_change_project

$ gcloud config get-value project

function _gcloud_change_account() {
  local account=$(gcloud auth list --format="value(account)" | fzf | awk '{print $1}')
  if [[ -n $account ]]; then
    gcloud config set account $account
    return $?
  fi
}
alias gca=_gcloud_change_account

# contextのリストを表示
$ kubectl config get-contexts
# contextを切り替え
$ kubectl config use-context CONTEXT

# bash
source <(kubectl completion bash)
# zsh
source <(kubectl completion zsh)

if [ $commands[kubectl] ]; then
  source <(kubectl completion zsh)
fi

$ kubectl get pod
$ kubectl get po

$ kubectl get deployment
$ kubectl get deploy

$ kubectl get service
$ kubectl get svc

alias k=kubectl
alias kx=kubectx
alias kn=kubens

if [ $commands[stern] ]; then
  source <(stern --completion=zsh)
fi

export GOOGLE_APPLICATION_CREDENTIALS=/path/to/key.json

package main

import (
    "context"
    "log"
    "cloud.google.com/go/spanner/admin/database/apiv1"
    adminpb "google.golang.org/genproto/googleapis/spanner/admin/database/v1"
    "fmt"
    "time"
    "google.golang.org/grpc/status"
    "google.golang.org/grpc/codes"
)

func main() {
    ctx := context.Background()
    client, err := database.NewDatabaseAdminClient(ctx)
    if err != nil {
        log.Fatal(err)
    }

    projectID := "xxx"
    instanceID := "xxx"
    databaseID := "xxx"
    dsn := fmt.Sprintf("projects/%s/instances/%s/databases/%s", projectID, instanceID, databaseID)
    dsnParent := fmt.Sprintf("projects/%s/instances/%s", projectID, instanceID)

    {
        exists := true
        if _, err := client.GetDatabase(ctx, &adminpb.GetDatabaseRequest{Name: dsn}); err != nil {
            st, ok := status.FromError(err)
            if ok && st.Code() == codes.NotFound {
                exists = false
            } else {
                log.Fatal(err)
            }
        }

        if exists {
            fmt.Printf("begin (DROP DATABASE)\n")
            start := time.Now()
            if err := client.DropDatabase(ctx, &adminpb.DropDatabaseRequest{
                Database: dsn,
            }); err != nil {
                log.Fatal(err)
            }
            fmt.Printf("end (DROP DATABASE) (%s)\n", time.Since(start))
        }
    }

    {
        fmt.Printf("begin (CREATE DATABASE)\n")
        start := time.Now()
        op, err := client.CreateDatabase(ctx, &adminpb.CreateDatabaseRequest{
            Parent:          dsnParent,
            CreateStatement: fmt.Sprintf("CREATE DATABASE `%s`", databaseID),
        })
        if err != nil {
            log.Fatal(err)
        }
        if _, err := op.Wait(ctx); err != nil {
            log.Fatal(err)
        }
        fmt.Printf("end (CREATE DATABASE) (%s)\n", time.Since(start))
    }

    {
        fmt.Printf("begin (CREATE TABLE & INDEX)\n")
        start := time.Now()
        op, err := client.UpdateDatabaseDdl(ctx, &adminpb.UpdateDatabaseDdlRequest{
            Database: dsn,
            Statements: []string{
                `CREATE TABLE Singers (
                    SingerId   INT64 NOT NULL,
                    FirstName  STRING(1024),
                    LastName   STRING(1024),
                    SingerInfo BYTES(MAX)
                ) PRIMARY KEY (SingerId)`,
                `CREATE INDEX SingersByFirstName ON Singers(FirstName)`},
        })
        if err != nil {
            log.Fatal(err)
        }
        if err := op.Wait(ctx); err != nil {
            log.Fatal(err)
        }
        fmt.Printf("end (CREATE TABLE & INDEX) (%s)\n", time.Since(start))
    }
}

begin (DROP DATABASE)
end (DROP DATABASE) (2.471652346s)

begin (CREATE DATABASE)
end (CREATE DATABASE) (7.146112054s)

begin (CREATE TABLE & INDEX)
end (CREATE TABLE & INDEX) (8m1.547491812s)

        op, err := client.CreateDatabase(ctx, &adminpb.CreateDatabaseRequest{
            Parent:          dsnParent,
            CreateStatement: fmt.Sprintf("CREATE DATABASE `%s`", databaseID),
+           ExtraStatements: []string{
+               `CREATE TABLE Singers (
+                   SingerId   INT64 NOT NULL,
+                   FirstName  STRING(1024),
+                   LastName   STRING(1024),
+                   SingerInfo BYTES(MAX)
+               ) PRIMARY KEY (SingerId)`,
+               `CREATE INDEX SingersByFirstName ON Singers(FirstName)`},
        })

begin (DROP DATABASE)
end (DROP DATABASE) (2.507284052s)

begin (CREATE DATABASE + ExtraStatements)
end (CREATE DATABASE + ExtraStatements) (8.352879087s)

client.ReadWriteTransaction(ctx, func(ctx context.Context, tx *spanner.ReadWriteTransaction) error {
    sql := "INSERT INTO User (...) VALUES (...)"
    if _, err := tx.Update(ctx, spanner.NewStatement(sql)); err != nil {
        return err
    }
    return nil
})

SELECT * FROM Singers WHERE ID = @param1

SELECT
  CURRENT_DATE() AS run_date,
  mean_squared_error,
  r2_score,
  ...
FROM
  ML.EVALUATE(MODEL `モデル名`,
    (
    SELECT
      ...
    FROM
      `テーブル名`
    WHERE timestamp BETWEEN CURRENT_DATE() AND DATE_ADD(CURRENT_DATE(), INTERVAL 3 MONTH)))

"config": {
    "function_name": "helloWorld",
    "region": "リージョンをいれる 例:asia-northeast1",
    "gcp_project": "GCPのプロジェクトIDをいれる",
    "runtime": "ランタイムを指定 例:nodejs8"
  },

$ npm run lint

$ npm run build

$ npm install -g mocha　//　mochaがインストールされていればスキップ

$ npm run test

  Hello function
    ✓ Get 200 response

  1 passing (31ms)

$ npm run deploy --prefix functions/src/

$ curl https://asia-northeast1-foo.cloudfunctions.net/helloWorld
$ Hello World

$ go get github.com/keitaro1020/datastore-tools

$ datastore-tools select -p [project-name] -k [kind-name]
[
  {
    "__key__": {
      "Kind": "Fruits",
      "ID": 5634612826996736,
      "Name": "",
      "Namespace": ""
    },
    "description": "オレンジ",
    "name": "orange"
  },
  {
    "__key__": {
      "Kind": "Fruits",
      "ID": 5643096528257024,
      "Name": "",
      "Namespace": ""
    },
    "description": "りんご",
    "name": "apple"
  }
]

~ $ datastore-tools select -p [project-name] -k [kind-name] -t
+------------------+--------+-------------+
|       KEY        |  NAME  | DESCRIPTION |
+------------------+--------+-------------+
| 5634612826996736 | orange | オレンジ    |
+------------------+--------+-------------+
| 5643096528257024 | apple  | りんご      |
+------------------+--------+-------------+

~ $ datastore-tools update -p [project-name] -k [kind-name] -w name=apple -s description="りんご とても美味しい"
~ $ datastore-tools select -p [project-name] -k [kind-name]
[
  {
    "__key__": {
      "Kind": "Fruits",
      "ID": 5634612826996736,
      "Name": "",
      "Namespace": ""
    },
    "description": "オレンジ",
    "name": "orange"
  },
  {
    "__key__": {
      "Kind": "Fruits",
      "ID": 5643096528257024,
      "Name": "",
      "Namespace": ""
    },
    "description": "りんご とても美味しい",
    "name": "apple"
  }
]

~ $ datastore-tools truncate -p [project-name] -k [kind-name]
truncate finish, count = 2 
~ $ datastore-tools select -p [project-name] -k [kind-name]
[
]

$ curl https://sdk.cloud.google.com | bash

$ curl https://sdk.cloud.google.com
#!/bin/bash

URL=https://dl.google.com/dl/cloudsdk/channels/rapid/install_google_cloud_sdk.bash

function download {
  scratch="$(mktemp -d -t tmp.XXXXXXXXXX)" || exit
  script_file="$scratch/install_google_cloud_sdk.bash"

  echo "Downloading Google Cloud SDK install script: $URL"
  curl -# "$URL" > "$script_file" || exit
  chmod 775 "$script_file"

  echo "Running install script from: $script_file"
  "$script_file" "$@"
}

download "$@"

$ brew cask install google-cloud-sdk

$ curl https://sdk.cloud.google.com | bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   443    0   443    0     0   1381      0 --:--:-- --:--:-- --:--:--  1909
Downloading Google Cloud SDK install script: https://dl.google.com/dl/cloudsdk/channels/rapid/install_google_cloud_sdk.bash
######################################################################## 100.0%
Running install script from: /var/folders/0w/fhc_kcts3rz9r36c9qlx2vkr0000gn/T/tmp.XXXXXXXXXX.VPSuXP9n/install_google_cloud_sdk.bash
which curl
curl -# -f https://dl.google.com/dl/cloudsdk/channels/rapid/google-cloud-sdk.tar.gz
######################################################################## 100.0%

Installation directory (this will create a google-cloud-sdk subdirectory) (/Users/daisuke):
mkdir -p /Users/daisuke
tar -C /Users/daisuke -zxvf /var/folders/0w/fhc_kcts3rz9r36c9qlx2vkr0000gn/T/tmp.XXXXXXXXXX.nExxemcm/google-cloud-sdk.tar.gz
x google-cloud-sdk/
x google-cloud-sdk/lib/
x google-cloud-sdk/lib/third_party/
==========================================================
~ 略 ~
==========================================================
x google-cloud-sdk/.install/core.manifest
x google-cloud-sdk/.install/.download/

/Users/daisuke/google-cloud-sdk/install.sh
Welcome to the Google Cloud SDK!

To help improve the quality of this product, we collect anonymized usage data
and anonymized stacktraces when crashes are encountered; additional information
is available at <https://cloud.google.com/sdk/usage-statistics>. You may choose
to opt out of this collection now (by choosing 'N' at the below prompt), or at
any time in the future by running the following command:

    gcloud config set disable_usage_reporting true

Do you want to help improve the Google Cloud SDK (Y/n)? # <--------------------ここで "Enter"


This will install all the core command line tools necessary for working with
the Google Cloud Platform.



Your current Cloud SDK version is: 228.0.0
Installing components from version: 228.0.0

┌────────────────────────────────────────────────────────────────────────────┐
│                    These components will be installed.                     │
├─────────────────────────────────────────────────────┬────────────┬─────────┤
│                         Name                        │  Version   │   Size  │
├─────────────────────────────────────────────────────┼────────────┼─────────┤
│ BigQuery Command Line Tool                          │     2.0.39 │ < 1 MiB │
│ BigQuery Command Line Tool (Platform Specific)      │     2.0.34 │ < 1 MiB │
│ Cloud SDK Core Libraries (Platform Specific)        │ 2018.09.24 │ < 1 MiB │
│ Cloud Storage Command Line Tool                     │       4.34 │ 3.5 MiB │
│ Cloud Storage Command Line Tool (Platform Specific) │       4.34 │ < 1 MiB │
│ Default set of gcloud commands                      │            │         │
│ gcloud cli dependencies                             │ 2018.08.03 │ 1.5 MiB │
└─────────────────────────────────────────────────────┴────────────┴─────────┘

For the latest full release notes, please visit:
  https://cloud.google.com/sdk/release_notes

╔════════════════════════════════════════════════════════════╗
╠═ Creating update staging area                             ═╣
╠════════════════════════════════════════════════════════════╣
╠═ Installing: BigQuery Command Line Tool                   ═╣
╠════════════════════════════════════════════════════════════╣
╠═ Installing: BigQuery Command Line Tool (Platform Spec... ═╣
╠════════════════════════════════════════════════════════════╣
╠═ Installing: Cloud SDK Core Libraries (Platform Specific) ═╣
╠════════════════════════════════════════════════════════════╣
╠═ Installing: Cloud Storage Command Line Tool              ═╣
╠════════════════════════════════════════════════════════════╣
╠═ Installing: Cloud Storage Command Line Tool (Platform... ═╣
╠════════════════════════════════════════════════════════════╣
╠═ Installing: Default set of gcloud commands               ═╣
╠════════════════════════════════════════════════════════════╣
╠═ Installing: gcloud cli dependencies                      ═╣
╠════════════════════════════════════════════════════════════╣
╠═ Creating backup and activating new installation          ═╣
╚════════════════════════════════════════════════════════════╝

Performing post processing steps...done.

Update done!


Modify profile to update your $PATH and enable shell command
completion?

Do you want to continue (Y/n)? # <--------------------ここで "Enter"
The Google Cloud SDK installer will now prompt you to update an rc
file to bring the Google Cloud CLIs into your environment.

Enter a path to an rc file to update, or leave blank to use
[/Users/daisuke/.bash_profile]: # <--------------------ここで "Enter"
Backing up [/Users/daisuke/.bash_profile] to [/Users/daisuke/.bash_profile.backup].
[/Users/daisuke/.bash_profile] has been updated.

==> Start a new shell for the changes to take effect.


For more information on how to get started, please visit:
  https://cloud.google.com/sdk/docs/quickstarts

# The next line updates PATH for the Google Cloud SDK.
if [ -f '/Users/daisuke/google-cloud-sdk/path.bash.inc' ]; then . '/Users/daisuke/google-cloud-sdk/path.bash.inc'; fi

# The next line enables shell command completion for gcloud.
if [ -f '/Users/daisuke/google-cloud-sdk/completion.bash.inc' ]; then . '/Users/daisuke/google-cloud-sdk/completion.bash.inc'; fi

# 再読み込みして
$ source .bash_profile
# gcloudコマンドが叩ければ完了です
$ gcloud version
Google Cloud SDK 228.0.0
bq 2.0.39
core 2018.12.07
gsutil 4.34

$ gcloud init 
Welcome! This command will take you through the configuration of gcloud.

Your current configuration has been set to: [default]

You can skip diagnostics next time by using the following flag:
  gcloud init --skip-diagnostics

Network diagnostic detects and fixes local network connection issues.
Checking network connection...done.
Reachability Check passed.
Network diagnostic passed (1/1 checks passed).

You must log in to continue. Would you like to log in (Y/n)? # <------------- ここで "Enter"

You are logged in as: [gee.awa@gmail.com].

Pick cloud project to use:
 [1] global-phalanx-xxxxxxx
 [2] Create a new project
Please enter numeric choice or text value (must exactly match list
item):  # <---------- 1 or 2を入力

Do you want to configure a default Compute Region and Zone? (Y/n)? <----------- ここで "Enter"

Which Google Compute Engine zone would you like to use as project
default?
If you do not specify a zone via a command line flag while working
with Compute Engine resources, the default is assumed.
 [1] us-east1-b
 [2] us-east1-c
 [3] us-east1-d
 [4] us-east4-c
 [5] us-east4-b
 [6] us-east4-a
 [7] us-central1-c
 [8] us-central1-a
 [9] us-central1-f
 [10] us-central1-b
 [11] us-west1-b
 [12] us-west1-c
 [13] us-west1-a
 [14] europe-west4-a
 [15] europe-west4-b
 [16] europe-west4-c
 [17] europe-west1-b
 [18] europe-west1-d
 [19] europe-west1-c
 [20] europe-west3-b
 [21] europe-west3-c
 [22] europe-west3-a
 [23] europe-west2-c
 [24] europe-west2-b
 [25] europe-west2-a
 [26] asia-east1-b
 [27] asia-east1-a
 [28] asia-east1-c
 [29] asia-southeast1-b
 [30] asia-southeast1-a
 [31] asia-southeast1-c
 [32] asia-northeast1-b
 [33] asia-northeast1-c
 [34] asia-northeast1-a
 [35] asia-south1-c
 [36] asia-south1-b
 [37] asia-south1-a
 [38] australia-southeast1-b
 [39] australia-southeast1-c
 [40] australia-southeast1-a
 [41] southamerica-east1-b
 [42] southamerica-east1-c
 [43] southamerica-east1-a
 [44] asia-east2-a
 [45] asia-east2-b
 [46] asia-east2-c
 [47] europe-north1-a
 [48] europe-north1-b
 [49] europe-north1-c
 [50] northamerica-northeast1-a
Did not print [6] options.
Too many options [56]. Enter "list" at prompt to print choices fully.
Please enter numeric choice or text value (must exactly match list
item):  # <--------------------------------------------------- 1 ~ 50で選ぶ

Your project default Compute Engine zone has been set to [us-east1-b].
You can change it by running [gcloud config set compute/zone NAME].

Your project default Compute Engine region has been set to [us-east1].
You can change it by running [gcloud config set compute/region NAME].

Created a default .boto configuration file at [/Users/daisuke/.boto]. See this file and
[https://cloud.google.com/storage/docs/gsutil/commands/config] for more
information about configuring Google Cloud Storage.
Your Google Cloud SDK is configured and ready to use!

* Commands that require authentication will use gee.awa@gmail.com by default
* Commands will reference project `global-phalanx-225913` by default
* Compute Engine commands will use region `us-east1` by default
* Compute Engine commands will use zone `us-east1-b` by default

Run `gcloud help config` to learn how to change individual settings

This gcloud configuration is called [default]. You can create additional configurations if you work with multiple accounts and/or projects.
Run `gcloud topic configurations` to learn more.

Some things to try next:

* Run `gcloud --help` to see the Cloud Platform services you can interact with. And run `gcloud help COMMAND` to get help on any gcloud command.
* Run `gcloud topic --help` to learn about advanced features of the SDK like arg files and output formatting

RUN wget https://releases.hashicorp.com/terraform/0.11.8/terraform_0.11.8_linux_amd64.zip
RUN unzip terraform_0.11.8_linux_amd64.zip -d /usr/local/bin
RUN pip install ansible

git add Dockerfile
git commit -m "edit Dockerfile"
git push origin master

gcloud auth print-access-token

docker login -u oauth2accesstoken -p {先程のトークン} https://asia.gcr.io

FROM alpine
CMD echo "hello! ore-dayo!"

docker build -t asia.gcr.io/{project id}/oreore .

docker push asia.gcr.io/{project id}/oreore

docker rmi {containerのid}

docker run --rm asia.gcr.io/{project id}/oreore

project_id      = "meta-iterator-225901"
region          = "us-west1"
project_name    = "scaling-sample"
dev_target_size = "1"
zone            = "us-west1-a"
network         = "default"

machine_dev     = {
    "name"              = "dev"
    "machine_type"      = "f1-micro"
    "env_name"          = "dev"
    "group_name"        = "dev"

    "disk_type"         = "pd-standard"
    "disk_size"         = "30"

    "update_strategy"   = "NONE"
}

"instance_group_zones"  = [
    "us-west1-a",
]

resource "google_compute_instance_template" "instance_template" {
  name_prefix  = "${var.project_name}-${lookup(var.machine_dev, "name")}-"
  machine_type = "${lookup(var.machine_dev, "machine_type", "f1-micro")}"
  region       = "${var.region}"

  disk {
    source_image = "${coalesce(var.dev_image, data.terraform_remote_state.output.dev_image)}"
    disk_type    = "${lookup(var.machine_dev, "disk_type", "pd-standard")}"
    disk_size_gb = "${lookup(var.machine_dev, "disk_size", "30")}"
    device_name  = "${lookup(var.machine_dev, "device_name", "persistent-disk-0")}"
  }

  network_interface {
    network = "${var.network}"
    access_config {}
  }

  lifecycle {
    create_before_destroy = true
  }
}

実行例
$ terraform apply -var "dev_image=scaling-sample-dev-instance-1545206547"

resource "google_compute_instance_group_manager" "instance_group_manager" {
  name = "instance-group-manager"
  instance_template = "${google_compute_instance_template.instance_template.self_link}"
  base_instance_name = "dev-instance"
  zone = "${var.zone}"
  target_size = "${var.dev_target_size}"
  update_strategy = "ROLLING_UPDATE"
  rolling_update_policy {
    minimal_action = "REPLACE"
    type = "PROACTIVE"
    max_unavailable_fixed = 0
  }
}

実行例
$ terraform apply -var "dev_target_size=1"

- name: Execute Base Setting...
  hosts: "{{ packer_build_target }}"
  become: yes
  gather_facts: yes

  tasks:
    - name: Create sample file
      copy:
        content: helloworld
        dest: /message

{
  "builders": [{
    "type": "googlecompute",
    "account_file": "{{user `credential_file`}}",
    "project_id": "{{user `project_id`}}",
    "source_image_family": "centos-7",
    "zone": "{{user `zone`}}",
    "instance_name": "{{user `project`}}-{{user `app_stage`}}-instance-base",
    "machine_type": "{{user `machine_type`}}",
    "disk_size": "{{user `disk_size`}}",
    "image_family": "{{user `project`}}-{{user `app_stage`}}-instance",
    "image_name": "{{user `project`}}-{{user `app_stage`}}-instance-{{timestamp}}",
    "network": "default",
    "subnetwork": "default",
    "omit_external_ip": false,
    "use_internal_ip": false,
    "tags": [
        "packer-build"
    ],
    "ssh_username": "ansible",
    "ssh_private_key_file": "../credentials/ansible_key"
  }],
  "provisioners": [
    {
      "type": "ansible",
      "playbook_file": "{{user `playbook_file`}}",
      "extra_arguments": [
          "-i", "./inventory",
          "-e", "packer_build_target={{user `project`}}-{{user `app_stage`}}-instance-base",
          "-e", "packer_build=yes"
      ]
    }
  ]
}

{
    "credential_file": "../credentials/scaling-sample-427451a6e5ec.json",
    "project_id": "meta-iterator-225901",
    "zone": "us-west1-a",
    "project": "scaling-sample",
    "machine_type": "f1-micro",
    "disk_size": "30",
    "app_stage": "dev",
    "group": "dev",
    "network": "default",
    "playbook_file": "playbook/build_image.yml"
}

$ packer build -var-file=packer/vars/scaling-sample-dev.json packer/packer.json

(略)
Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

Outputs:

dev_image = scaling-sample-dev-instance-1545206547
dev_target_size = 1

$ terraform apply -var "dev_target_size=1" -var "dev_image=scaling-sample-dev-instance-1545206547"

[dev-instance-b2rv ~]$ cat /message
helloworld