├── .gitignore ├── LICENSE.txt ├── README.md ├── config.json.example ├── event.json ├── handler.py ├── package_stack.py ├── serverless.yml └── template.yml /.gitignore: -------------------------------------------------------------------------------- 1 | # Distribution / packaging 2 | .Python 3 | env/ 4 | build/ 5 | develop-eggs/ 6 | dist/ 7 | downloads/ 8 | eggs/ 9 | .eggs/ 10 | lib/ 11 | lib64/ 12 | parts/ 13 | sdist/ 14 | var/ 15 | *.egg-info/ 16 | .installed.cfg 17 | *.egg 18 | 19 | # Serverless directories 20 | .serverless -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | 2 | Apache License 3 | Version 2.0, January 2004 4 | http://www.apache.org/licenses/ 5 | 6 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 7 | 8 | 1. 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We also recommend that a 186 | file or class name and description of purpose be included on the 187 | same "printed page" as the copyright notice for easier 188 | identification within third-party archives. 189 | 190 | Copyright [yyyy] [name of copyright owner] 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Yesterdaytabase 2 | 3 | Yesterdaytabase is a Lambda function that pulls previous snapshots of RDS 4 | databases for use as staging or testing environments. The function runs on a 5 | schedule and recreates the DB with a CloudFormation stack. For more about the 6 | internals, see my [blog post][post] on it. 7 | 8 | ## Usage 9 | 10 | If you only have one database, launch the stack and fill in the 11 | `SourceConfiguration` value with a one-line JSON object. The config is in this 12 | format: 13 | 14 | ``` 15 | { 16 | "config": { 17 | "domain": "mysite.com", # the root of your Route53 zone 18 | "db": { 19 | "name": "my-rds-dbname", 20 | "security_group": "sg-12345678", 21 | "subnet_group": "net-group-12345678" # the RDS subnet group to launch the DB in 22 | } 23 | } 24 | } 25 | ``` 26 | 27 | For more databases, create more CloudWatch Event rules that have the same JSON 28 | format in their input field. 29 | 30 | Alternatively, you can bake the configuration into a file in the deployed 31 | function, called `config.json`. The format matches the `config` key in the 32 | event above. 33 | 34 | ## Run it 35 | 36 | Want to run it? Launch it and go. 37 | Launch stack yesterdaytabase 38 | Fill in the database you've got snapshots of and your Route53 domain. 39 | 40 | [post]: https://serverlesscode.com/post/lambda-rds-prod-staging-pipeline/ 41 | -------------------------------------------------------------------------------- /config.json.example: -------------------------------------------------------------------------------- 1 | { 2 | "domain": "mysite.com", 3 | "db": { 4 | "name": "my-rds-dbname", 5 | "security_group": "sg-12345678", 6 | "subnet_group": "net-group-12345678" 7 | } 8 | } 9 | -------------------------------------------------------------------------------- /event.json: -------------------------------------------------------------------------------- 1 | {} -------------------------------------------------------------------------------- /handler.py: -------------------------------------------------------------------------------- 1 | # -*- coding: utf-8 -*- 2 | # Copyright 2016 Ryan Brown 3 | # 4 | # Licensed under the Apache License, Version 2.0 (the "License"); 5 | # you may not use this file except in compliance with the License. 6 | # You may obtain a copy of the License at 7 | # 8 | # http://www.apache.org/licenses/LICENSE-2.0 9 | # 10 | # Unless required by applicable law or agreed to in writing, software 11 | # distributed under the License is distributed on an "AS IS" BASIS, 12 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | # See the License for the specific language governing permissions and 14 | # limitations under the License. 15 | 16 | """ 17 | This function creates a CFN stack from yesterday's production DB 18 | snapshot and makes it available at 'dbname.yoursite.com' 19 | """ 20 | 21 | from __future__ import print_function 22 | 23 | import boto3 24 | import botocore 25 | import datetime 26 | import json 27 | import logging 28 | import os 29 | import traceback 30 | 31 | log = logging.getLogger() 32 | log.setLevel(logging.DEBUG) 33 | 34 | rds = boto3.client('rds') 35 | cfn = boto3.client('cloudformation') 36 | 37 | cwd = os.path.dirname(os.path.abspath(__file__)) 38 | 39 | 40 | def handler(event, context): 41 | if not isinstance(event, dict): 42 | event = json.loads(event) 43 | 44 | log.debug("Received event {}".format(json.dumps(event))) 45 | 46 | if event.get('config') is None: 47 | cfg = json.load(open(os.path.join(cwd, 'config.json'))) 48 | else: 49 | cfg = event.get('config') 50 | 51 | STACK_NAME = '{}-yesterdaytabase'.format(cfg['db']['name']) 52 | RESTORE_TO_NAME = '{}-{}'.format(cfg['db']['name'], datetime.datetime.utcnow().strftime('%Y-%m-%d-%H%M')) 53 | PRETTY_NAME = '{}-yesterday'.format(cfg['db']['name']) 54 | 55 | if event.get("action") == "delete": 56 | log.info("Got event {}, deleting stack".format(json.dumps(event))) 57 | try: 58 | cfn.delete_stack(StackName=STACK_NAME) 59 | return {"action": "delete", "error": None} 60 | except: 61 | log.exception("Could not delete stack {}".format(STACK_NAME)) 62 | return {"action": "delete", "message": "Could not delete stack {}".format(STACK_NAME), "error": traceback.format_exc()} 63 | 64 | try: 65 | template = open(os.path.join(cwd, "template.yml")).read() 66 | except: 67 | log.exception("Failed to open `template.yml` file with IOError") 68 | return {"message": "Couldn't read CloudFormation template.", "error": traceback.format_exc()} 69 | 70 | 71 | snapshots = rds.describe_db_snapshots()["DBSnapshots"] 72 | db_snapshots = [snap for snap in snapshots 73 | if snap["DBInstanceIdentifier"] == cfg['db']['name']] 74 | 75 | if not db_snapshots: 76 | return {"message": ("No matching DB snapshots - try again when there are" 77 | "snapshots for database {}").format(cfg['db']['name']), 78 | "error": "No DB snapshots", "action": event.get('action')} 79 | 80 | # get the most recent snapshot by sorting by date 81 | latest_snapshot = sorted(db_snapshots, reverse=True, 82 | key=lambda x: x["SnapshotCreateTime"])[0] 83 | identifier = latest_snapshot["DBSnapshotIdentifier"] 84 | 85 | stack_params = { 86 | "SnapshotID": identifier, 87 | "DiskSize": str(latest_snapshot["AllocatedStorage"]), 88 | "DomainRoot": cfg['domain'], 89 | "DBName": RESTORE_TO_NAME, 90 | "HostName": PRETTY_NAME, 91 | "SecurityGroup": cfg['db']['security_group'], 92 | "SubnetGroup": cfg['db']['subnet_group'], 93 | } 94 | 95 | cfn_params = dict( 96 | StackName=STACK_NAME, 97 | TemplateBody=template, 98 | Parameters=[{"ParameterKey": k, "ParameterValue": v} for k, v in stack_params.items()] 99 | ) 100 | 101 | if event.get("action", "create") in ["create", "update"]: 102 | try: 103 | stacks = cfn.describe_stacks(StackName=STACK_NAME) 104 | except botocore.exceptions.ClientError as exc: 105 | if 'does not exist' in exc.message: 106 | cfn.create_stack(**cfn_params) 107 | return {"action": "create", "error": None, "stack_args": cfn_params} 108 | else: 109 | if stacks["Stacks"][0]["StackStatus"].endswith("COMPLETE"): 110 | # stack can be updated 111 | cfn.update_stack(**cfn_params) 112 | return {"action": "update", "error": None, "stack_args": cfn_params} 113 | else: 114 | msg = "Stack %s is in state %s and cannot be updated" % (STACK_NAME, stacks["Stacks"][0]["StackStatus"]) 115 | log.error(msg) 116 | return {"action": "update", "message": msg, "error": True, "stack_args": cfn_params} 117 | 118 | return {"action": None, "stack_args": cfn_params} 119 | -------------------------------------------------------------------------------- /package_stack.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python2 2 | # -*- coding: utf-8 -*- 3 | # Copyright 2016 Ryan Brown 4 | # 5 | # Licensed under the Apache License, Version 2.0 (the "License"); 6 | # you may not use this file except in compliance with the License. 7 | # You may obtain a copy of the License at 8 | # 9 | # http://www.apache.org/licenses/LICENSE-2.0 10 | # 11 | # Unless required by applicable law or agreed to in writing, software 12 | # distributed under the License is distributed on an "AS IS" BASIS, 13 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 | # See the License for the specific language governing permissions and 15 | # limitations under the License. 16 | 17 | import json 18 | import boto3 19 | 20 | session = boto3.Session(profile_name='personal') 21 | s3 = session.client('s3') 22 | 23 | BUCKET = 'demos.serverlesscode.com' 24 | PREFIX = 'pub/lambda/yesterdaytabase/' 25 | 26 | 27 | def munge_template(): 28 | template = json.load(open('.serverless/cloudformation-template-update-stack.json')) 29 | 30 | template['Resources'].pop('ServerlessDeploymentBucket') 31 | template['Outputs'].pop('ServerlessDeploymentBucketName') 32 | 33 | # Instead, get the Lambda function from the serverlesscode distribution bucket 34 | template['Resources']['DbManagerLambdaFunction']['Properties']['Code'] = { 35 | 'S3Bucket': BUCKET, 36 | 'S3Key': PREFIX + 'code.zip', 37 | } 38 | 39 | # Add a parameter so the user can supply an event that includes the DB name, domain, and other config 40 | template['Resources']['DbManagerEventsRuleSchedule1']['Properties']['Targets'][0]['Input'] = {'Ref': 'SourceConfiguration'} 41 | template['Parameters'] = { 42 | 'SourceConfiguration': { 43 | 'Type': 'String', 44 | 'Description': 'The configuration values to invoke the DB config with, see https://github.com/ryansb/yesterdaytabase for full docs', 45 | 'Default': json.dumps( 46 | { 47 | "config": { 48 | "domain": "mysite.com", 49 | "db": { 50 | "name": "my-rds-dbname", 51 | "security_group": "sg-12345678", 52 | "subnet_group": "net-group-12345678" 53 | } 54 | } 55 | } 56 | ) 57 | } 58 | } 59 | 60 | template['Description'] = "Deploy the `yesterdaytabase` Lambda function to build new instances daily from fresh snapshots" 61 | return template 62 | 63 | 64 | def upload_zip(sha): 65 | s3.put_object( 66 | ACL='public-read', 67 | Bucket=BUCKET, 68 | Key=PREFIX + 'code.zip', 69 | ContentType='application/zip', 70 | Metadata={'GitVersion': sha}, 71 | Body=open('.serverless/yesterdaytabase.zip') 72 | ) 73 | 74 | 75 | def upload_template(sha, template): 76 | s3.put_object( 77 | ACL='public-read', 78 | Bucket=BUCKET, 79 | Key=PREFIX + 'template.json', 80 | ContentType='application/json', 81 | Metadata={'GitVersion': sha}, 82 | Body=json.dumps(template, indent=2) 83 | ) 84 | 85 | 86 | def get_sha(): 87 | import subprocess 88 | sha = subprocess.check_output('git rev-parse HEAD'.split(' ')).strip() 89 | if len(subprocess.check_output('git diff --shortstat'.split(' '))): 90 | sha += '-dirty' 91 | return sha 92 | 93 | 94 | if __name__ == '__main__': 95 | upload_zip(get_sha()) 96 | template = munge_template() 97 | upload_template(get_sha(), template) 98 | print('Successfully uploaded template & code') 99 | 100 | -------------------------------------------------------------------------------- /serverless.yml: -------------------------------------------------------------------------------- 1 | service: yesterdaytabase 2 | 3 | provider: 4 | name: aws 5 | cfLogs: true 6 | runtime: python2.7 7 | stage: prod 8 | region: us-east-1 9 | 10 | # IAM role requires extra permissions for CloudFormation, RDS, and Route53 management 11 | iamRoleStatements: 12 | - Effect: "Allow" 13 | Action: 14 | - "rds:CreateDBInstance" 15 | - "rds:ModifyDBInstance" 16 | - "rds:RestoreDBInstanceFromDBSnapshot" 17 | - "rds:DeleteDBInstance" 18 | Resource: "*" 19 | Condition: 20 | StringEquals: {"rds:DatabaseClass": "db.t2.small"} 21 | - Effect: "Allow" 22 | Action: 23 | - "rds:Describe*" 24 | - "ec2:Describe*" 25 | - "cloudformation:Describe*" 26 | - "cloudwatch:PutMetricAlarm" 27 | - "cloudformation:GetTemplate" 28 | - "cloudformation:ValidateTemplate" 29 | - "cloudformation:DeleteStack" 30 | - "cloudformation:UpdateStack" 31 | - "cloudformation:CreateStack" 32 | - "route53:Get*" 33 | - "route53:List*" 34 | - "route53:ChangeResourceRecordSets" 35 | Resource: "*" 36 | 37 | functions: 38 | DbManager: 39 | handler: handler.handler 40 | events: 41 | - schedule: "cron(0 11 * * ? *)" 42 | enabled: true 43 | 44 | package: 45 | include: 46 | - template.yml 47 | - handler.py 48 | exclude: 49 | - .git/** 50 | - .gitignore 51 | - config.json.example 52 | - event.json 53 | 54 | 55 | # you can add CloudFormation resource templates here 56 | #resources: 57 | # Resources: 58 | # NewResource: 59 | # Type: AWS::S3::Bucket 60 | # Properties: 61 | # BucketName: my-new-bucket 62 | # Outputs: 63 | # NewOutput: 64 | # Description: "Description for the output" 65 | # Value: "Some output value" 66 | -------------------------------------------------------------------------------- /template.yml: -------------------------------------------------------------------------------- 1 | AWSTemplateFormatVersion: '2010-09-09' 2 | Parameters: 3 | DBName: 4 | Description: Name of the new DB instance, will be combined with DomainRoot to make Route53 domain name. 5 | Type: String 6 | HostName: 7 | Description: Name to combine with the DomainRoot to create a Route53 record 8 | Type: String 9 | DomainRoot: 10 | Description: Domain to put the DB name record under (not the FQDN) 11 | Type: String 12 | SnapshotID: 13 | Description: Identifier for DB snapshot 14 | Type: String 15 | DiskSize: 16 | Description: How many gigs of storage to make available for the snapshot restore 17 | Type: String 18 | SecurityGroup: 19 | Description: Which network security group should this instance be in? 20 | Type: String 21 | SubnetGroup: 22 | Description: Name of the DB subnet group to place (yesterday's copy of) the database in 23 | Type: String 24 | Resources: 25 | DBAliasRecord: 26 | Type: 'AWS::Route53::RecordSet' 27 | Properties: 28 | Comment: DNS name for a DB from yesterday's snapshot 29 | HostedZoneName: !Sub "${DomainRoot}." 30 | Name: !Sub "${HostName}.${DomainRoot}" 31 | ResourceRecords: 32 | - !GetAtt Database.Endpoint.Address 33 | TTL: 300 34 | Type: CNAME 35 | Database: 36 | Type: 'AWS::RDS::DBInstance' 37 | Properties: 38 | AllocatedStorage: !Ref DiskSize 39 | BackupRetentionPeriod: 0 40 | DBInstanceClass: 'db.t2.small' 41 | DBInstanceIdentifier: !Ref DBName 42 | DBSnapshotIdentifier: !Ref SnapshotID 43 | PubliclyAccessible: true 44 | StorageType: gp2 45 | DBSubnetGroupName: !Ref SubnetGroup 46 | VPCSecurityGroups: 47 | - !Ref SecurityGroup 48 | Outputs: 49 | DomainName: 50 | Value: !Ref DBAliasRecord 51 | Description: "DNS name for yesterday's DB" 52 | --------------------------------------------------------------------------------