透過無 Proxy gRPC 服務設定進階流量管理

gcloud

1. 建立 Cloud Router 執行個體：

   gcloud compute routers create nat-router-us-central1 \
       --network=default \
       --region=us-central1
   

2. 為 Cloud NAT 設定路由器：

   gcloud compute routers nats create nat-config \
       --router-region=us-central1 \
       --router=nat-router-us-central1 \
       --nat-all-subnet-ip-ranges \
       --auto-allocate-nat-external-ips
   

gcloud

1. 建立健康狀態檢查：

   gcloud compute health-checks create grpc grpcwallet-health-check \
       --use-serving-port
   

2. 建立健康狀態檢查的防火牆規則：

   gcloud compute firewall-rules create grpcwallet-allow-health-checks \
       --network default --action allow --direction INGRESS \
       --source-ranges 35.191.0.0/16,130.211.0.0/22 \
       --target-tags allow-health-checks \
       --rules tcp:50051-50053
   

gcloud

• 建立執行個體範本：

  gcloud compute instance-templates create grpcwallet-account-template \
     --scopes=https://www.googleapis.com/auth/cloud-platform \
     --tags=allow-health-checks \
     --network-interface=no-address \
     --image-family=debian-10 \
     --image-project=debian-cloud \
     --metadata-from-file=startup-script=<(echo "#! /bin/bash
  set -ex
  cd /root
  export HOME=/root
  sudo apt-get update -y
  pushd \$(mktemp -d)
  sudo apt-get install -y wget git
  wget https://dl.google.com/go/go1.16.5.linux-amd64.tar.gz
  sudo tar -C /usr/local -xvf go1.16.5.linux-amd64.tar.gz
  sudo cp /usr/local/go/bin/go /usr/bin/go
  popd
  git clone -b $EXAMPLES_VERSION --single-branch --depth=1 https://github.com/GoogleCloudPlatform/traffic-director-grpc-examples.git
  cd traffic-director-grpc-examples/go/account_server/
  go build .
  sudo systemd-run ./account_server --port 50053 --hostname_suffix account")
  

gcloud

• 建立執行個體群組：

  gcloud compute instance-groups managed create grpcwallet-account-mig-us-central1 \
     --zone=us-central1-a \
     --size=2 \
     --template=grpcwallet-account-template
  

gcloud

• 建立具名通訊埠：

  gcloud compute instance-groups set-named-ports grpcwallet-account-mig-us-central1 \
     --named-ports=grpcwallet-account-port:50053 \
     --zone=us-central1-a
  

gcloud

1. 建立後端服務，然後將健康狀態檢查與新的後端服務建立關聯：

   gcloud compute backend-services create grpcwallet-account-service \
       --global \
       --load-balancing-scheme=INTERNAL_SELF_MANAGED \
       --protocol=GRPC \
       --port-name=grpcwallet-account-port \
       --health-checks=grpcwallet-health-check
   

2. 將代管執行個體群組新增為後端：

   gcloud compute backend-services add-backend grpcwallet-account-service \
       --instance-group=grpcwallet-account-mig-us-central1 \
       --instance-group-zone=us-central1-a \
       --global
   

gcloud

建立網址對應：

export PROJECT_ID=$(gcloud config list --format 'value(core.project)')
export BS_PREFIX=projects/$PROJECT_ID/global/backendServices/grpcwallet

gcloud compute url-maps import grpcwallet-url-map << EOF
name: grpcwallet-url-map
defaultService: $BS_PREFIX-account-service

hostRules:
- hosts:
  - account.grpcwallet.io
  pathMatcher: grpcwallet-account-path-matcher
- hosts:
  - stats.grpcwallet.io
  pathMatcher: grpcwallet-stats-path-matcher
- hosts:
  - wallet.grpcwallet.io
  pathMatcher: grpcwallet-wallet-path-matcher

pathMatchers:
- name: grpcwallet-account-path-matcher
  defaultService: $BS_PREFIX-account-service
  routeRules:
  - matchRules:
    - prefixMatch: /
      headerMatches:
      - headerName: route
        exactMatch: account-fault
    priority: 0
    routeAction:
      weightedBackendServices:
      - backendService: $BS_PREFIX-account-service
        weight: 100
      faultInjectionPolicy:
        abort:
          httpStatus: 503
          percentage: 30

- name: grpcwallet-stats-path-matcher
  defaultService: $BS_PREFIX-stats-service
  routeRules:
  - matchRules:
    - prefixMatch: /
      headerMatches:
      - headerName: membership
        exactMatch: premium
    priority: 0
    service: $BS_PREFIX-stats-premium-service

- name: grpcwallet-wallet-path-matcher
  defaultService: $BS_PREFIX-wallet-v1-service
  routeRules:
  - matchRules:
    - prefixMatch: /
      headerMatches:
      - headerName: session_id
        presentMatch: true
    priority: 0
    routeAction:
      weightedBackendServices:
      - backendService: $BS_PREFIX-wallet-v1-affinity-service
        weight: 100

  - matchRules:
    - prefixMatch: /
      headerMatches:
      - headerName: route
        exactMatch: timeout
    priority: 1
    routeAction:
      weightedBackendServices:
      - backendService: $BS_PREFIX-wallet-v2-service
        weight: 100
      maxStreamDuration:
        seconds: 5

  - matchRules:
    - prefixMatch: /
      headerMatches:
      - headerName: route
        exactMatch: fault
    priority: 2
    routeAction:
      weightedBackendServices:
      - backendService: $BS_PREFIX-wallet-v2-service
        weight: 100
      faultInjectionPolicy:
        abort:
          httpStatus: 503
          percentage: 50

  - matchRules:
    - prefixMatch: /
      headerMatches:
      - headerName: membership
        exactMatch: premium
    priority: 3
    routeAction:
      weightedBackendServices:
      - backendService: $BS_PREFIX-wallet-v1-service
        weight: 100
      retryPolicy:
        retryConditions:
          - unavailable
        numRetries: 3

  - matchRules:
    - fullPathMatch: /grpc.examples.wallet.Wallet/FetchBalance
    priority: 4
    routeAction:
      weightedBackendServices:
      - backendService: $BS_PREFIX-wallet-v1-service
        weight: 70
      - backendService: $BS_PREFIX-wallet-v2-service
        weight: 30

  - matchRules:
    - prefixMatch: /grpc.examples.wallet.Wallet/
    priority: 5
    routeAction:
      weightedBackendServices:
      - backendService: $BS_PREFIX-wallet-v2-service
        weight: 100
EOF

gcloud

• 建立目標 gRPC Proxy：

  gcloud compute target-grpc-proxies create grpcwallet-proxy \
     --url-map=grpcwallet-url-map \
     --validate-for-proxyless
  

gcloud

• 建立轉送規則：

  gcloud compute forwarding-rules create grpcwallet-forwarding-rule \
     --global \
     --load-balancing-scheme=INTERNAL_SELF_MANAGED \
     --address=0.0.0.0 \
     --address-region=us-central1 \
     --target-grpc-proxy=grpcwallet-proxy \
     --ports=80 \
     --network=default
  

gcloud

1. 建立用戶端 VM，並在該 VM 上執行用戶端來測試服務。您可以選擇加入 --network-interface=no-address 旗標。

   gcloud compute instances create grpc-wallet-client \
       --zone=us-central1-a \
       --scopes=https://www.googleapis.com/auth/cloud-platform \
       --image-family=debian-10 \
       --image-project=debian-cloud \
       --metadata-from-file=startup-script=<(echo '#! /bin/bash
   set -e
   export GRPC_XDS_BOOTSTRAP=/run/td-grpc-bootstrap.json
   # Expose bootstrap variable to SSH connections
   echo export GRPC_XDS_BOOTSTRAP=$GRPC_XDS_BOOTSTRAP | sudo tee /etc/profile.d/grpc-xds-bootstrap.sh
   # Create the bootstrap file
   curl -L https://storage.googleapis.com/traffic-director/td-grpc-bootstrap-0.19.0.tar.gz | tar -xz
   ./td-grpc-bootstrap-0.19.0/td-grpc-bootstrap | sudo tee $GRPC_XDS_BOOTSTRAP')
   

2. 使用 SSH 存取 VM，然後執行下列指令來準備 VM：

   export EXAMPLES_VERSION=v1.1.x
   sudo apt-get update
   sudo apt-get install git -y
   

3. 執行下列指令：

   git clone -b $EXAMPLES_VERSION --single-branch --depth=1 \
      https://github.com/GoogleCloudPlatform/traffic-director-grpc-examples.git
   curl -L https://github.com/fullstorydev/grpcurl/releases/download/v1.6.1/grpcurl_1.6.1_linux_x86_64.tar.gz | tar -xz
   chmod +x grpcurl
   

Java

1. 如要使用 gRPC Java 用戶端驗證服務，請執行下列指令：

   sudo apt-get install -y openjdk-11-jdk-headless
   

2. 執行下列指令：

   cd ~/traffic-director-grpc-examples/java
   ./gradlew installDist
   
   # This command calls 'FetchBalance' from 'wallet-service' in a loop,
   # to demonstrate that 'FetchBalance' gets responses from 'wallet-v1' (70%)
   # and 'wallet-v2' (30%).
   ./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Bob
   
   # This command calls the streaming RPC 'WatchBalance' from 'wallet-service'.
   # The RPC path matches the service prefix, so all requests are
   # sent to 'wallet-v2'.
   ./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob
   
   # This command calls 'WatchPrice' from 'stats-service'. It sends the
   # user's membership (premium or not) in metadata. Premium requests are
   # all sent to 'stats-premium' and get faster responses. Alice's requests
   # always go to premium and Bob's go to regular.
   ./build/install/wallet/bin/client price --stats_server="xds:///stats.grpcwallet.io" --watch=true --user=Bob
   ./build/install/wallet/bin/client price --stats_server="xds:///stats.grpcwallet.io" --watch=true --user=Alice
   

Go

1. 如要使用 gRPC Go 用戶端驗證服務，請安裝 golang 或按照官方操作說明進行：

   sudo apt-get install -y wget
   wget https://dl.google.com/go/go1.16.5.linux-amd64.tar.gz
   sudo tar -C /usr/local -xvf go1.16.5.linux-amd64.tar.gz
   sudo ln -s /usr/local/go/bin/go /usr/bin/go
   

2. 執行下列指令：

   cd ~/traffic-director-grpc-examples/go/wallet_client
   go build
   
   # This command calls 'FetchBalance' from 'wallet-service' in a loop,
   # to demonstrate that 'FetchBalance' gets responses from 'wallet-v1' (70%)
   # and 'wallet-v2' (30%).
   ./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch --user=Bob
   
   # This command calls the streaming RPC 'WatchBalance' from 'wallet-service'.
   # The RPC path matches the service prefix, so all requests
   # are sent to 'wallet-v2'.
   ./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch --user=Bob
   
   # This command calls 'WatchPrice' from 'stats-service'. It sends the
   # user's membership (premium or not) in metadata. Premium requests are
   # all sent to 'stats-premium' and get faster responses. Alice's requests
   # always go to premium and Bob's go to regular.
   ./wallet_client price --stats_server="xds:///stats.grpcwallet.io" --watch --user=Bob
   ./wallet_client price --stats_server="xds:///stats.grpcwallet.io" --watch --user=Alice
   

C++

1. 如要使用 gRPC C++ 用戶端驗證服務，請執行下列指令：

   sudo apt-get install -y build-essential
   

2. 執行下列指令：

   cd ~/traffic-director-grpc-examples/cpp
   ../tools/bazel build :client
   
   # This command calls 'FetchBalance' from 'wallet-service' in a loop,
   # to demonstrate that 'FetchBalance' gets responses from 'wallet-v1' (70%)
   # and 'wallet-v2' (30%).
   ../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Bob
   
   # This command calls the streaming RPC 'WatchBalance'  from 'wallet-service'.
   # The RPC path matches the service prefix, so all requests are sent to 'wallet-v2'.
   ../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob
   
   # This command calls 'WatchPrice' from 'stats-service'. It sends the
   # user's membership (premium or not) in metadata. Premium requests are
   # all sent to 'stats-premium' and get faster responses. Alice's requests
   # always go to premium, and Bob's go to regular.
   ../bazel-bin/cpp/client price --stats_server="xds:///stats.grpcwallet.io" --watch=true --user=Bob
   ../bazel-bin/cpp/client price --stats_server="xds:///stats.grpcwallet.io" --watch=true --user=Alice
   

Java

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/java
   ./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob  2>/dev/null 1>/dev/null &
   
   sleep 10 # Wait a few seconds to allow the watch to begin.
   
   ./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob
   

2. 輸出內容如下：

   io.grpc.examples.wallet.Client run
   INFO: Will try to run balance
   io.grpc.examples.wallet.Client run
   WARNING: RPC failed: Status{code=INTERNAL, description=RPC to stats server failed: UNAVAILABLE: Cluster max concurrent requests limit exceeded, cause=null}
   

3. 發出 kill 指令：

   kill %%
   

Go

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/go/wallet_client
   ./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch --user=Bob 2> /dev/null 1> /dev/null &
   
   sleep 10 # Wait a few seconds to allow the watch to begin.
   
   ./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch --user=Bob
   

2. 輸出內容如下：

   server host: error: no hostname
   failed to fetch balance: rpc error: code = Internal desc = RPC to stats server failed:
   UNAVAILABLE: Cluster max concurrent requests limit exceeded
   

3. 發出 kill 指令：

   kill %%
   

C++

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/cpp
   ../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob 2>/dev/null 1>/dev/null &
   
   sleep 10 # Wait a few seconds to allow the watch to begin.
   
   ../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob
   

2. 輸出內容如下：

   Client arguments: command: balance, wallet_server: xds:///wallet.grpcwallet.io, stats_server:
   localhost:18882, user: Bob, watch: 1 ,unary_watch: 0, observability_project: , route:
   13: RPC to stats server failed: UNAVAILABLE: Cluster max concurrent requests limit exceeded
   

3. 發出 kill 指令：

   kill %%
   

Java

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/java
   ./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Bob --route=fault
   

2. 輸出內容如下：

   server host: grpcwallet-wallet-v2-mig-us-central1-zznc
   total balance: 10340491
   - address: 148de9c5, balance: 2549839
   - address: 2e7d2c03, balance: 7790652
   io.grpc.examples.wallet.Client run
   WARNING: RPC failed: Status{code=UNAVAILABLE, description=RPC terminated due to fault injection: HTTP status code 503, cause=null}
   

Go

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/go/wallet_client
   ./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch --user=Bob --route=fault
   

2. 輸出內容如下：

    server host: grpcwallet-wallet-v1-mig-us-central1-bm1t_wallet-v1
    user: Bob, total grpc-coin balance: 10452589.
     - address: 2e7d2c03, balance: 7875108.
     - address: 148de9c5, balance: 2577481.
    failed to fetch balance: rpc error: code = Unavailable desc = RPC terminated due to fault injection
   

C++

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/cpp
   ../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Bob --route=fault
   

2. 輸出內容如下：

   Client arguments: command: balance, wallet_server: xds:///wallet.grpcwallet.io,
   stats_server: localhost:18882, user: Bob, watch: 0 ,unary_watch: 1, observability_project: ,
   route: fault server host: grpcwallet-wallet-v2-mig-us-central1-1lm6
   user: Bob total grpc-coin balance: 10211908
    - address: 148de9c5, balance: 2518132
    - address: 2e7d2c03, balance: 7693776
   14: Fault injected
   

gcloud

gcloud compute instance-groups managed resize \
    --size=0 grpcwallet-wallet-v2-mig-us-central1 \
    --zone=us-central1-a

Java

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/java
   ./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob
   

2. 指令停止回應。按下 ^C 鍵即可中斷指令。

Go

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/go/wallet_client
   ./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch --user=Bob
   

2. 指令停止回應。按下 ^C 鍵即可中斷指令。

C++

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/cpp
   ../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob
   

2. 指令停止回應。按下 ^C 鍵即可中斷指令。

Java

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/java
   ./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob --route=timeout
   

2. 輸出內容如下：

   io.grpc.examples.wallet.Client run
   WARNING: RPC failed: Status{code=DEADLINE_EXCEEDED, description=deadline exceeded after 4.999594070s.         [wait_for_ready, buffered_nanos=5000553401, waiting_for_connection], cause=null}
   

Go

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/go/wallet_client
   ./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch --user=Bob --route=timeout
   

2. 輸出內容如下：

   failed to create stream: rpc error: code = DeadlineExceeded desc = context deadline exceeded.
   

C++

1. 執行下列指令：

   cd ~/traffic-director-grpc-examples/cpp
   ../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob --route=timeout
   

2. 輸出內容如下：

   Client arguments: command: balance, wallet_server: xds:///wallet.grpcwallet.io, stats_server:
   localhost:18882, user: Bob, watch: 1 ,unary_watch: 0, observability_project: , route: timeout
   4: Deadline Exceeded
   

gcloud

gcloud compute instance-groups managed resize \
    --size=1 grpcwallet-wallet-v2-mig-us-central1 \
    --zone=us-central1-a

Java

執行下列指令：

cd ~/traffic-director-grpc-examples/java
# 30% of the requests fail because Bob is a normal user.
./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Bob --route=account-fault
# Less than 1% of the requests fail because Alice is a premium user.
./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Alice --route=account-fault

Go

執行下列指令：

cd ~/traffic-director-grpc-examples/go/wallet_client
# 30% of the requests fail because Bob is a normal user.
./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Bob --route=account-fault
# Less than 1% of the requests fail because Alice is a premium user.
./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Alice --route=account-fault

C++

執行下列指令：

cd ~/traffic-director-grpc-examples/cpp
# 30% of the requests fail because Bob is a normal user.
../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Bob --route=account-fault
# Less than 1% of the requests fail because Alice is a premium user.
../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Alice --route=account-fault

gcloud

1. 儲存後端服務 grpcwallet-wallet-v1-affinity-service 的設定：

   gcloud compute backend-services export grpcwallet-wallet-v1-affinity-service \
    --destination=bs_config.yaml \
    --global
   

2. 更新後端服務 grpcwallet-wallet-v1-affinity-service：

   project_id="$(gcloud config list --format 'value(core.project)')"
   backend_config="
   backends:
   - balancingMode: UTILIZATION
     capacityScaler: 1.0
     group: projects/${project_id}/zones/us-central1-a/instanceGroups/grpcwallet-wallet-v1-mig-us-central1
   connectionDraining:
     drainingTimeoutSec: 0
   healthChecks:
   - projects/${project_id}/global/healthChecks/grpcwallet-health-check
   loadBalancingScheme: INTERNAL_SELF_MANAGED
   name: grpcwallet-wallet-v1-affinity-service
   portName: grpcwallet-wallet-port
   protocol: GRPC
   sessionAffinity: HEADER_FIELD
   localityLbPolicy: RING_HASH
   consistentHash:
     httpHeaderName: session_id"
   gcloud compute backend-services import grpcwallet-wallet-v1-affinity-service --global <<< "${backend_config}"
   

Java

執行下列指令：

cd ~/traffic-director-grpc-examples/java
# Without affinity, requests are sent to both instances.
./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Alice
# With affinity, requests are sent to only one instance.
./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Alice --affinity=true

Go

執行下列指令：

cd ~/traffic-director-grpc-examples/go/wallet_client
# Without affinity, requests are sent to both instances.
./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Alice
# With affinity, requests are sent to only one instance.
./wallet_client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Alice --affinity=true

C++

執行下列指令：

cd ~/traffic-director-grpc-examples/cpp
# Without affinity, requests are sent to both instances.
../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Alice
# With affinity, requests are sent to only one instance.
../bazel-bin/cpp/client balance --wallet_server="xds:///wallet.grpcwallet.io" --unary_watch=true --user=Alice --affinity=true

gcloud

gcloud compute backend-services import grpcwallet-wallet-v1-affinity-service \
  --source=bs_config.yaml \
  --global

gcloud

1. 使用 gcloud compute backend-services export 指令匯出 grpcwallet-wallet-v2-service 後端服務設定檔：

   gcloud compute backend-services export grpcwallet-wallet-v2-service \
    --destination=bs_config.yaml \
    --global
   

2. 在 bs_config.yaml 檔案中，更新 grpcwallet-wallet-v2-service 設定，加入離群值偵測欄位：

   outlierDetection:
    interval:
      seconds: 1
      nanos: 0
    baseEjectionTime:
      seconds: 30
      nanos: 0
    successRateStdevFactor: 1000
   

3. 使用 gcloud compute backend-services import 指令匯入更新的檔案：

   gcloud compute backend-services import grpcwallet-wallet-v2-service \
    --source=bs_config.yaml \
    --global

gcloud

1. 使用 gcloud compute backend-services export 指令匯出 grpcwallet-wallet-v2-service 後端服務設定檔：

   gcloud compute backend-services export grpcwallet-wallet-v2-service \
   --destination=bs_config.yaml \
   --global
   

2. 更新匯出的 bs_config.yaml 檔案，加入以下程式碼：

   localityLbPolicy:
    -- policy
       name: RING_HASH
   

3. 使用 gcloud compute backend-services import 指令匯入更新後的檔案：

   gcloud compute backend-services import grpcwallet-wallet-v2-service --source=bs_config.yaml --global
   

gcloud

1. 使用 gcloud compute backend-services export 指令匯出 grpcwallet-wallet-v2-service 後端服務設定檔：

   gcloud compute backend-services export grpcwallet-wallet-v2-service \
   --destination=bs_config.yaml \
   --global
   

2. 更新匯出的 bs_config.yaml 檔案，以參照 example.ExampleLoadBalancer 政策。加入下列幾行：

   localityLbPolicies:
     - customPolicy:
         name: example.ExampleLoadBalancer
         data: '{ "message": "Hello load-balancing world!" }'
   

3. 使用 gcloud compute backend-services import 指令匯入更新後的檔案：

   gcloud compute backend-services import grpcwallet-wallet-v2-service --source=bs_config.yaml --global
   

4. 選用：測試負載平衡設定：

   Java

   cd ~/traffic-director-grpc-examples/java
   ./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob
   

   如果自訂負載平衡政策設定正確，您會看到設定中加入的訊息 (「Hello load-balancing world!」)。

gcloud

1. 使用 gcloud compute backend-services export 指令匯出 grpcwallet-wallet-v2-service 後端服務設定檔：

gcloud compute backend-services export grpcwallet-wallet-v2-service \
  --destination=bs_config.yaml \
  --global

1. 更新匯出的 bs_config.yaml 檔案，加入 localityLbPolicies 欄位。填入代表下列政策的項目：

   • 無效的自訂政策 (example.InvalidLoadBalancer)
   • 有效的自訂政策 (example.ExampleLoadBalancer)
   • 支援的內建政策 (LEAST_REQUEST)

   localityLbPolicies:
     - customPolicy:
         name: example.InvalidLoadBalancer
         data: '{ "message": "This load-balancing policy doesn't work!" }'
     - customPolicy:
         name: example.ExampleLoadBalancer
         data: '{ "message": "Hello load-balancing world!" }'
     - policy:
         name: LEAST_REQUEST
   

2. 使用 gcloud compute backend-services import 指令匯入更新後的檔案：

   gcloud compute backend-services import grpcwallet-wallet-v2-service --source=bs_config.yaml --global
   

3. 選用：測試負載平衡設定：

   Java

   cd ~/traffic-director-grpc-examples/java
   ./build/install/wallet/bin/client balance --wallet_server="xds:///wallet.grpcwallet.io" --watch=true --user=Bob
   

   在回應中，gRPC 會嘗試尋找 example.InvalidLoadBalancer，但失敗。之後，系統會改用 example.ExampleLoadBalancer，並顯示您在設定中加入的訊息 (「Hello load-balancing world!」)。用戶端上的 gRPC 記錄包含一則訊息，指出找不到 example.InvalidLoadBalancer。