[GCloud] 使用 gcloud 連線到 Google Cloud Platform 上的 VM
雖然把 WordPress 網站架在 Google Cloud Platform (GCP) 上了，
但其實對 GCP 這個平台還是相當的陌生…
有時候需要進去 WordPress 機器裡執行一些指令操作，
都只能從 Google Cloud 網頁上，選擇 SSH 的功能：
這會開啟一個瀏覽器的視窗，裡面就是 SSH 連到 VM 後的畫面，
操作起來和一般的 SSH 沒什麼不同，
不過畢竟不是自己執行的 SSH，
所以也不曉得要怎麼利用它傳檔案到 VM 上去：
今天稍微瞄了一下文件，把 Google Cloud SDK 裝起來了，
之後就可以直接用 gcloud 指令 SSH 到 VM 上，快速許多～
1. 安裝 Google Cloud SDK
參考文件 Google Cloud Platform > Cloud SDK > Quickstart for Mac OS X，
因為我是 Mac 的機器，因此抓下面的檔案：
google-cloud-sdk-156.0.0-darwin-x86_64.tar.gz
抓下來之後，解開放到一個固定的位置。
最好不要直接放在 ~/Downloads 目錄，因為 gcloud 會在解開的目錄裡，
把 gcloud 留在像 ~/Downloads 這種暫存用的目錄感覺怪怪的，
可能不小心在清除 ~/Downloads 目錄時，就不小心把 gcloud 砍掉了～
像我是將解開後的 google-cloud-sdk 目錄，放到 Dropbox 目錄裡，
這樣我在公司與家裡的電腦上，都能藉由 Dropbox 同步，
而使用到相同的 gcloud：
tar xvf google-cloud-sdk-156.0.0-darwin-x86_64.tar.gz mv google-cloud-sdk ~/Dropbox/Software/
接著執行 google-cloud-sdk/install.sh 開始安裝～
一開始會問是不是要幫忙改善 Google Cloud SDK，按下 y：
testuser@localhost ~ $ ~/Dropbox/Software/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)? y
接著說會修改 ~/.bash_profile 檔案，把 gcloud 的路徑加進去：
Your current Cloud SDK version is: 156.0.0 The latest available version is: 156.0.0 ┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │ Components │ ├───────────────┬──────────────────────────────────────────────────────┬──────────────────────────┬───────────┤ │ Status │ Name │ ID │ Size │ ├───────────────┼──────────────────────────────────────────────────────┼──────────────────────────┼───────────┤ │ Not Installed │ App Engine Go Extensions │ app-engine-go │ 96.7 MiB │ │ Not Installed │ Cloud Bigtable Command Line Tool │ cbt │ 4.0 MiB │ │ Not Installed │ Cloud Bigtable Emulator │ bigtable │ 3.3 MiB │ │ Not Installed │ Cloud Datalab Command Line Tool │ datalab │ < 1 MiB │ │ Not Installed │ Cloud Datastore Emulator │ cloud-datastore-emulator │ 15.4 MiB │ │ Not Installed │ Cloud Datastore Emulator (Legacy) │ gcd-emulator │ 38.1 MiB │ │ Not Installed │ Cloud Pub/Sub Emulator │ pubsub-emulator │ 21.0 MiB │ │ Not Installed │ Emulator Reverse Proxy │ emulator-reverse-proxy │ 14.5 MiB │ │ Not Installed │ Google Container Registry's Docker credential helper │ docker-credential-gcr │ 2.3 MiB │ │ Not Installed │ gcloud Alpha Commands │ alpha │ < 1 MiB │ │ Not Installed │ gcloud Beta Commands │ beta │ < 1 MiB │ │ Not Installed │ gcloud app Java Extensions │ app-engine-java │ 132.2 MiB │ │ Not Installed │ gcloud app PHP Extensions (Mac OS X) │ app-engine-php-darwin │ 21.9 MiB │ │ Not Installed │ gcloud app Python Extensions │ app-engine-python │ 6.2 MiB │ │ Not Installed │ kubectl │ kubectl │ 14.8 MiB │ │ Installed │ BigQuery Command Line Tool │ bq │ < 1 MiB │ │ Installed │ Cloud SDK Core Libraries │ core │ 6.1 MiB │ │ Installed │ Cloud Storage Command Line Tool │ gsutil │ 2.9 MiB │ │ Installed │ Default set of gcloud commands │ gcloud │ │ └───────────────┴──────────────────────────────────────────────────────┴──────────────────────────┴───────────┘ To install or remove components at your current SDK version [156.0.0], run: $ gcloud components install COMPONENT_ID $ gcloud components remove COMPONENT_ID To update your SDK installation to the latest version [156.0.0], run: $ gcloud components update Modify profile to update your $PATH and enable shell command completion? Do you want to continue (Y/n)? y
這樣子就安裝好 Google Cloud SDK 了，
而 gcloud 指令也已經可以使用了，就在 google-cloud-sdk/bin 目錄下，
不過要記得開一個新的 Terminal 視窗，才會用到新的 gcloud 路徑：
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/testuser/.bash_profile]: Backing up [/Users/testuser/.bash_profile] to [/Users/testuser/.bash_profile.backup]. [/Users/testuser/.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
2. 初始化設定 Google Cloud SDK
裝好 Google Cloud SDK 後，還要讓 SDK 綁定一個 Google 帳號，
gcloud 才知道它的動作要應用在哪個 Google 帳戶上。
執行 gcloud init 開始設定：
testuser@localhost ~ $ 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 (1/1 checks) passed. You must log in to continue. Would you like to log in (Y/n)? y
按下 y 後，瀏覽器會開啟 Google 登入的畫面，選擇要使用的 Google 帳戶：
允許 Google Cloud SDK 來存取我們在 Google Cloud Platform 上的資源：
這樣子 Google Cloud SDK 就已經和我們的 Google 帳號綁定了～
接著選擇預設使用的專案：
You are logged in as: [testuser@gmail.com]. Pick cloud project to use: [1] ephrain-blog [2] Create a new project Please enter numeric choice or text value (must exactly match list item): 1
專案選好之後，還可以修改一下 Google Compute Engine 的設定，
按下 y 來設定：
Your current project has been set to: [ephrain-blog]. Do you want to configure Google Compute Engine (https://cloud.google.com/compute) settings (Y/n)? y
主要可以設定的也就是這個 VM 的實體所在地，
之前有提過 asia-east1-a 是中華電信的機房，而且有較多的 CPU 核心，
因此我還是設定在這個區域上：
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] asia-east1-b [2] asia-east1-a [3] asia-east1-c [4] asia-northeast1-a [5] asia-northeast1-c [6] asia-northeast1-b [7] asia-southeast1-b [8] asia-southeast1-a [9] europe-west1-c [10] europe-west1-d [11] europe-west1-b [12] us-central1-f [13] us-central1-a [14] us-central1-b [15] us-central1-c [16] us-east1-d [17] us-east1-b [18] us-east1-c [19] us-east4-b [20] us-east4-c [21] us-east4-a [22] us-west1-a [23] us-west1-b [24] Do not set default zone Please enter numeric choice or text value (must exactly match list item): 2
這樣子就初始化完成了：
Your project default Compute Engine zone has been set to [asia-east1-a]. You can change it by running [gcloud config set compute/zone NAME]. Your project default Compute Engine region has been set to [asia-east1]. You can change it by running [gcloud config set compute/region NAME]. Your Google Cloud SDK is configured and ready to use! * Commands that require authentication will use testuser@gmail.com by default * Commands will reference project `ephrain-blog` by default * Compute Engine commands will use region `asia-east1` by default * Compute Engine commands will use zone `asia-east1-a` 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 -h` to learn about advanced features of the SDK like arg files and output formatting
3. 使用 gcloud 開 SSH 連線至 VM 裡面
可以參考這篇文件：
Google Cloud Platform > Compute Engine > Connecting to Linux Instances
首先，用 gcloud compute instances list，將我們擁有的 VM 都列出來～
目前我是只有 wordpress-ephrain-vm 這個 VM：
testuser@localhost ~ $ gcloud compute instances list NAME ZONE MACHINE_TYPE PREEMPTIBLE INTERNAL_IP EXTERNAL_IP STATUS wordpress-ephrain-vm asia-east1-a f1-micro 10.140.0.2 35.185.170.101 RUNNING
得知 VM 的名稱後，就可以用 gcloud compute ssh 指令，
來 SSH 連線到指定的 VM 了～
因為我這是第一次使用 gcloud 連線，
因此 gcloud 會幫忙建出 SSH 的 public/private key：
testuser@localhost ~ $ gcloud compute ssh wordpress-ephrain-vm WARNING: The public SSH key file for gcloud does not exist. WARNING: The private SSH key file for gcloud does not exist. WARNING: You do not have an SSH key for gcloud. WARNING: SSH keygen will be executed to generate a key. Generating public/private rsa key pair. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /Users/testuser/.ssh/google_compute_engine. Your public key has been saved in /Users/testuser/.ssh/google_compute_engine.pub. Updating project ssh metadata.../Updated [https://www.googleapis.com/compute/v1/projects/ephrain-blog]. Updating project ssh metadata...done. Waiting for SSH key to propagate.
gcloud 會在 ~/.ssh 目錄下，產生出名叫 google_compute_engine 的公私鑰，
接著就直接 SSH 連線到 VM 中了：
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testuser@wordpress-ephrain-vm:~$
有了 gcloud 之後，就不用再打開瀏覽器，才能做 SSH 連線啦～
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