GKEのコンテナ内のディレクトリにGCSバケットをマウントする ref: https://qiita.com/h-sakano/items/f82713347eb192586489

apache2.conf

 .
 .
 .
# These need to be set in /etc/apache2/envvars
User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}
 .
 .
 .

entrypoint.sh

#!/bin/bash
source /etc/apache2/envvars
chown -R www-data:www-data *
sudo -u www-data gcsfuse example-bucket ./
exec apache2 -D FOREGROUND

example.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: example
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: example
        tier: frontend
        environment : production
    spec:
      containers:
        - image: gcr.io/example/example_image:0.0.0
          imagePullPolicy: Always
          name: example
          ports:
            - containerPort: 80
              name: example
          securityContext:
            privileged: true
---
apiVersion: v1
kind: Service
metadata:
  name: example
  labels:
    app: example
spec:
  selector:
    app: example
    tier: frontend
    environment : production
  type: LoadBalancer
  ports:
    - port: 80
      protocol: TCP
      targetPort: 80

file0.txt

$ gcloud container clusters create example-cluster \
--machine-type f1-micro \
--scopes storage-full

file1.txt

# docker run -it php:5.6-apache /bin/bash
# apt-get install -y lsb-release
# lsb_release -c -s
jessie

file3.txt

 .
 .
 .
: ${APACHE_RUN_USER:=www-data}
export APACHE_RUN_USER
: ${APACHE_RUN_GROUP:=www-data}
export APACHE_RUN_GROUP
 .
 .
 .

file4.txt

FROM php:5.6-apache
WORKDIR /path/to/DocumentRoot

# gcsfuse-[バージョン名]を指定する
RUN echo "deb http://packages.cloud.google.com/apt gcsfuse-jessie main" | tee /etc/apt/sources.list.d/gcsfuse.list
RUN curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
RUN groupadd fuse
RUN usermod -aG fuse www-data

RUN apt-get update -y && apt-get install -y \
    gcsfuse \
    sudo \
    vim

COPY entrypoint.sh /usr/local/bin/entrypoint.sh
RUN chmod a+x /usr/local/bin/entrypoint.sh

EXPOSE 80 443
ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]

file6.txt

docker build -f ./Dockerfile -t example_image:0.0.0 .
docker tag example_image:0.0.0 gcr.io/example/example_image:0.0.0
gcloud docker -- push gcr.io/example/example_image:0.0.0

file7.txt

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: example
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: example
        tier: frontend
        environment : production
    spec:
      containers:
        - image: gcr.io/example/example_image:0.0.0
          imagePullPolicy: Always
          name: example
          ports:
            - containerPort: 80
              name: example
          securityContext:
            privileged: true
---
apiVersion: v1
kind: Service
metadata:
  name: example
  labels:
    app: example
spec:
  selector:
    app: example
    tier: frontend
    environment : production
  type: LoadBalancer
  ports:
    - port: 80
      protocol: TCP
      targetPort: 80

file8.txt

$ gcloud container clusters get-credentials example-cluster --project example
$ kubectl create -f example.yaml

file9.txt

$ kubectl get svc example