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Merge pull request #23 from devdattakulkarni/Containers
Added Docker installation script; Also greetings example
2 parents be0ae7b + 2294dbd commit 5680350

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‎Containers/Kubernetes-examples/GCP/greetings/Dockerfile‎

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FROM ubuntu:14.04
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RUN apt-get update -y \
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&& apt-get install -y python-setuptools python-pip python-mysqldb
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ADD requirements.txt /src/requirements.txt
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RUN cd /src; pip install -r requirements.txt
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ADD . /src
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EXPOSE 5000
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CMD ["python", "/src/application.py"]

‎Containers/Kubernetes-examples/GCP/greetings/README.txt‎

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Greetings
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----------
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This example shows deployment of a web application that uses MySQL backend.
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Several environment definition files are available:
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1) environment-local.yaml: Environment definition containing MySQL container platform element
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2) environment-rds-local.yaml: Environment definition containing RDS resource. The RDS instance
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is open so as to allow connecting application container running locally on your machine
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3) environment-rds-ecs.yaml: Environment definition containing RDS and ECS cluster resource.
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4) environment-cloudsql-gke.yaml: Environment definition containing Cloud SQL and GKE cluster resource.
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Several application definition files are available:
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1) app-local.yaml: Application definition for local deployment of application
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2) app-aws.yaml: Application definition for AWS ECS deployment
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3) app-gcloud.yaml: Application definition for Google GKE deployment
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4) greetings-pod.yaml: Kubernetes Pod definition for Google GKE deployment
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===============
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Deploy Locally
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===============
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Deploy application locally binding to local MySQL container
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$ cld env create env-local environment-local.yaml
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$ cld container create cont1 local
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Edit app-local.yaml to include image id obtained from output of command:
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$ cld container show cont1
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$ cld app deploy greetings-local env-local app-local.yaml
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==================
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Deploy on AWS ECS
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==================
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Deploy application on ECS binding to a RDS instance
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$ cld env create env-aws environment-rds-ecs.yaml
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$ cld container create cont2 ecr
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Edit app-aws.yaml to include image url obtained from output of command:
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$ cld container show cont2
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$ cld app deploy greetings-aws env-aws app-aws.yaml
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======================================
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Deploy on Google GKE - using app yaml
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======================================
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Deploy application on GKE binding to a Cloud SQL instance
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$ cld env create env-gcloud environment-cloudsql-gke.yaml
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$ cld container create cont3 gcr
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Edit app-gcloud.yaml to include image url obtained from output of command:
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$ cld container show cont3
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$ cld app deploy greetings-gke env-gcloud app-gcloud.yaml
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======================================
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Deploy on Google GKE - using Pod yaml
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======================================
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Deploy application on GKE binding to a Cloud SQL instance
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$ cld env create env-gcloud environment-cloudsql-gke.yaml
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$ cld container create cont3 gcr
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Edit greetings-pod.yaml to include image url obtained from output of command:
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$ cld container show cont3
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$ cld app deploy greetings-gke env-gcloud greetings-pod.yaml
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Track / Debug:
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---------------
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$ cld env show <env-name>
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$ cld app show <app-name>
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$ cld app logs <app-name>
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$ cld env shell <env-name>
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Verify:
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-------
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$ cld app show <app-name>
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$ cld app list
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$ cld env show <env-name>
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$ cld env list
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Cleanup:
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--------
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$ cld app delete <app-name>
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$ cld env delete <env-name>
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$ cld container delete <container-name>

‎Containers/Kubernetes-examples/GCP/greetings/application.py‎

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import os
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import time
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from flask import request
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from flask import Flask, render_template
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import mysql.connector
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from mysql.connector import errorcode
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application = Flask(__name__)
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app = application
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def get_db_creds():
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db = os.environ.get("DB", None) or os.environ.get("database", None)
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username = os.environ.get("USER", None) or os.environ.get("username", None)
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password = os.environ.get("PASSWORD", None) or os.environ.get("password", None)
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hostname = os.environ.get("HOST", None) or os.environ.get("dbhost", None)
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return db, username, password, hostname
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def create_table():
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# Check if table exists or not. Create and populate it only if it does not exist.
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db, username, password, hostname = get_db_creds()
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table_ddl = 'CREATE TABLE message(id INT UNSIGNED NOT NULL AUTO_INCREMENT, greeting TEXT, PRIMARY KEY (id))'
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cnx = ''
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try:
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cnx = mysql.connector.connect(user=username, password=password,
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host=hostname,
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database=db)
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except Exception as exp:
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print(exp)
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import MySQLdb
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#try:
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cnx = MySQLdb.connect(unix_socket=hostname, user=username, passwd=password, db=db)
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#except Exception as exp1:
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# print(exp1)
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cur = cnx.cursor()
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try:
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cur.execute(table_ddl)
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cnx.commit()
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populate_data()
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except mysql.connector.Error as err:
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if err.errno == errorcode.ER_TABLE_EXISTS_ERROR:
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print("already exists.")
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else:
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print(err.msg)
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def populate_data():
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db, username, password, hostname = get_db_creds()
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print("Inside populate_data")
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print("DB: %s" % db)
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print("Username: %s" % username)
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print("Password: %s" % password)
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print("Hostname: %s" % hostname)
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cnx = ''
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try:
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cnx = mysql.connector.connect(user=username, password=password,
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host=hostname,
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database=db)
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except Exception as exp:
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print(exp)
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import MySQLdb
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cnx = MySQLdb.connect(unix_socket=hostname, user=username, passwd=password, db=db)
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cur = cnx.cursor()
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cur.execute("INSERT INTO message (greeting) values ('Hello, World!')")
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cnx.commit()
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print("Returning from populate_data")
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def query_data():
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db, username, password, hostname = get_db_creds()
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print("Inside query_data")
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print("DB: %s" % db)
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print("Username: %s" % username)
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print("Password: %s" % password)
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print("Hostname: %s" % hostname)
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cnx = ''
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try:
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cnx = mysql.connector.connect(user=username, password=password,
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host=hostname,
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database=db)
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except Exception as exp:
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print(exp)
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import MySQLdb
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cnx = MySQLdb.connect(unix_socket=hostname, user=username, passwd=password, db=db)
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cur = cnx.cursor()
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cur.execute("SELECT greeting FROM message")
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entries = [dict(greeting=row[0]) for row in cur.fetchall()]
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return entries
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try:
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print("---------" + time.strftime('%a %H:%M:%S'))
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print("Before create_table global")
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create_table()
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print("After create_data global")
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except Exception as exp:
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print("Got exception %s" % exp)
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conn = None
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@app.route('/add_to_db', methods=['POST'])
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def add_to_db():
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print("Received request.")
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print(request.form['message'])
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msg = request.form['message']
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db, username, password, hostname = get_db_creds()
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cnx = ''
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try:
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cnx = mysql.connector.connect(user=username, password=password,
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host=hostname,
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database=db)
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except Exception as exp:
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print(exp)
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import MySQLdb
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cnx = MySQLdb.connect(unix_socket=hostname, user=username, passwd=password, db=db)
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cur = cnx.cursor()
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cur.execute("INSERT INTO message (greeting) values ('" + msg + "')")
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cnx.commit()
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return hello()
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@app.route("/")
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def hello():
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print("Inside hello")
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print("Printing available environment variables")
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print(os.environ)
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print("Before displaying index.html")
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entries = query_data()
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print("Entries: %s" % entries)
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return render_template('index.html', entries=entries)
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if __name__ == "__main__":
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app.debug = True
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app.run(host='0.0.0.0')

‎Containers/Kubernetes-examples/GCP/greetings/greetings-deployment.yaml‎

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apiVersion: apps/v1beta1
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kind: Deployment
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metadata:
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name: greetings-deployment
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labels:
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app: greetings
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: greetings
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template:
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metadata:
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labels:
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app: greetings
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spec:
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containers:
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- name: greetings1
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image: gcr.io/cloudark-test-gke/greetings:v1
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ports:
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- containerPort: 5000
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env:
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- name: "PASSWORD"
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value: testpass123!@#
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- name: "DB"
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value: testdb
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- name: "HOST"
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value: 35.225.61.225
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- name: "USER"
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value: root

‎Containers/Kubernetes-examples/GCP/greetings/greetings-pod.yaml‎

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apiVersion: v1
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kind: Pod
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metadata:
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name: greetings1
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labels:
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name: greetings1
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spec:
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containers:
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- image: us.gcr.io/cloudark-test-gke/greetpod:1512924392448
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name: wordpress
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ports:
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- containerPort: 5000
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env:
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- name: "PASSWORD"
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value: $CLOUDARK_CLOUDSQL_Password
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- name: "DB"
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value: $CLOUDARK_CLOUDSQL_DBName
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- name: "HOST"
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value: $CLOUDARK_CLOUDSQL_Address
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- name: "USER"
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value: $CLOUDARK_CLOUDSQL_Username

‎Containers/Kubernetes-examples/GCP/greetings/greetings-service.yaml‎

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kind: Service
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apiVersion: v1
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metadata:
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name: greeting-service
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spec:
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selector:
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app: greetings
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ports:
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- protocol: TCP
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port: 80
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targetPort: 5000
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type: LoadBalancer

‎Containers/Kubernetes-examples/GCP/greetings/requirements.txt‎

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flask
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https://cdn.mysql.com/Downloads/Connector-Python/mysql-connector-python-1.0.12.tar.gz

‎Containers/Kubernetes-examples/GCP/greetings/templates/index.html‎

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<html>
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<head>
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<style>
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.bodycenter {
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margin: auto;
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width: 60%;
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padding: 10px;
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}
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.footer{
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text-align: center;
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border: 1px solid #73AD21;
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}
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</style>
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</head>
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<body>
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<div class="bodycenter">
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<form action="add_to_db" method="post">
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<p>Sample Web Application that uses a managed relational database service such as Google CloudSQL or Amazon RDS.</p>
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<br>
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Input a greeting: <input type="text" name="message"><br>
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<input type="submit" value="Add greeting to database">
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</form>
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<p>Greetings stored in database</p>
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<br>
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{% for entry in entries %}
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<div>
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<div>{{ entry.greeting }}</div>
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</div>
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{% endfor %}
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<div class="footer">
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</div>
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</div>
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</body>
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</html>

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