AWS Database Migration Service (AWS DMS) is a cloud service that makes it easy to migrate relational databases, data warehouses, NoSQL databases, and other types of data stores. You can use AWS DMS to migrate your data into the Cloud, between on-premises DB servers, or between any combinations of cloud and on-premises setups. You may get more information about AWS DMS in the official AWS documentation.
This CloudFormation DMS example provides a CFN template to spin up the DMS infrastructure required for your DB migration.
If you’re interested in the DB migration, it might be worth checking our article “How to import/export Oracle DB to/from AWS using S3 integration feature“.
For data migration from an on-premises environment to AWS or from AWS to an on-premises environment or another cloud provider, we recommend you consider AWS DataSync or AWS SnowBall.
CloudFormation DMS template
So, my goal for this post is to provide you with a template that you may use to automate the DMS infrastructure setup. The whole template consists of the following AWS resources:
- DMS Replication Subnet Group (AWS::DMS::ReplicationSubnetGroup).
- DMS Replication Instance (AWS::DMS::ReplicationInstance).
- DMS Source and Target Endpoints (AWS::DMS::Endpoint).
- DMS Replication Task (AWS::DMS::ReplicationTask).
I’m not using Secrets Manager in this template to make it simpler. Still, you may easily avoid using plain text passwords in stack parameters by using simple custom resources and Lambda Function. Please, feel free to ask for examples in the comments, and I’ll provide them to you.
Also, I’m pointing your attention to the way I’m putting JSON objects populated with parameters from the stack to the DMS Replication Task using !Sub intrinsic function.
So, long story short, here’s our template:
AWSTemplateFormatVersion: 2010-09-09
Description: >
This stack template creates DMS pipeline to migrate one DB to another.
Parameters:
Vpc:
Description: >
VPC where to setup DMS instance.
DMS instance should have connectivity to RDS instance.
Type: 'AWS::EC2::VPC::Id'
SubnetIds:
Description: >
Subnets for DMS subnet group. Must contain at least two
subnets in two different Availability Zones in the same region.
Type: 'List'
SecurityGroupIds:
Description: >
Security Group IDs for DMS subnet group. Must contain at least two
subnets in two different Availability Zones in the same region.
Type: 'List'
ReplicationInstanceAllocatedStorage:
Description: >
The amount of storage (in gigabytes) to be initially allocated
for the replication instance.
Type: Number
Default: 100
ReplicationInstanceClass:
Description: >
The compute and memory capacity of the replication instance as specified
by the replication instance class.
Valid Values: dms.t2.micro | dms.t2.small | dms.t2.medium | dms.t2.large |
dms.c4.large | dms.c4.xlarge | dms.c4.2xlarge | dms.c4.4xlarge
Type: String
Default: dms.r4.2xlarge
DbSchemaName:
Description: >
DB schema name, which will be migrated
Type: String
SrcDbName:
Description: >
Source DB name
Type: String
SrcDbUsername:
Description: >
Source DB username
Type: String
SrcDbPassword:
Description: >
Source DB password
Type: String
SrcDbEngine:
Description: >
Source DB engine. Valid values, depending on the EndpointType value, include
mysql, oracle, postgres, mariadb, aurora, aurora-postgresql, redshift, s3, db2,
azuredb, sybase, dynamodb, mongodb, and sqlserver.
Type: String
SrcDbServerName:
Description: >
Source DB hostname
Type: String
SrcDbPort:
Description: >
Source DB connection port number
Type: Number
DstDbName:
Description: >
Destination DB name
Type: String
DstDbUsername:
Description: >
Source DB username
Type: String
DstDbPassword:
Description: >
Destination DB password
Type: String
DstDbEngine:
Description: >
Destination DB engine. Valid values, depending on the EndpointType value, include
mysql, oracle, postgres, mariadb, aurora, aurora-postgresql, redshift, s3, db2,
azuredb, sybase, dynamodb, mongodb, and sqlserver.
Type: String
DstDbServerName:
Description: >
Destination DB hostname
Type: String
DstDbPort:
Description: >
Destination DB connection port number
Type: Number
DmsReplicationTaskEnableLogging:
Description: >
Boolean flag if you want to enable logging for your DMS task
Type: String
Default: true
DmsReplicationTaskSupportLOBs:
Description: >
Enable LOBs support for DMS task
Type: String
Default: true
DmsReplicationTaskMigrationType:
Description: >
The migration type. Valid values: full-load | cdc | full-load-and-cdc
Type: String
Default: full-load
Metadata:
AWS::CloudFormation::Interface:
ParameterGroups:
-
Label:
default: "Network Configuration"
Parameters:
- Vpc
- SubnetIds
-
Label:
default: "Replication Instance Parameters"
Parameters:
- ReplicationInstanceAllocatedStorage
- ReplicationInstanceClass
- SecurityGroupIds
-
Label:
default: "Source Endpoint Parameters"
Parameters:
- SrcDbName
- SrcDbUsername
- SrcDbPassword
- SrcDbServerName
- SrcDbPort
- SrcDbEngine
-
Label:
default: "Target Endpoint Parameters"
Parameters:
- DstDbName
- DstDbUsername
- DstDbPassword
- DstDbServerName
- DstDbPort
- DstDbEngine
-
Label:
default: "Replication Task Parameters"
Parameters:
- DbSchemaName
- DmsReplicationTaskMigrationType
- DmsReplicationTaskEnableLogging
- DmsReplicationTaskSupportLOBs
- DstDbPort
- DstDbEngine
Resources:
ReplicationInstanceSubnetGroup:
Type: AWS::DMS::ReplicationSubnetGroup
Properties:
ReplicationSubnetGroupDescription: !Sub '${AWS::StackName} DMS Subnet Group'
ReplicationSubnetGroupIdentifier: !Sub '${AWS::StackName}-dms-subnet-group'
SubnetIds: !Ref SubnetIds
Tags:
- Key: Name
Value: !Sub '${AWS::StackName}-dms-subnet-group'
ReplicationInstance:
Type: AWS::DMS::ReplicationInstance
Properties:
AllocatedStorage: !Ref ReplicationInstanceAllocatedStorage
AllowMajorVersionUpgrade: false
AutoMinorVersionUpgrade: false
MultiAZ: false
PubliclyAccessible: false
ReplicationInstanceClass: !Sub '${ReplicationInstanceClass}'
ReplicationInstanceIdentifier: !Sub '${AWS::StackName}-replication-instance'
ReplicationSubnetGroupIdentifier: !Ref ReplicationInstanceSubnetGroup
VpcSecurityGroupIds: !Ref SecurityGroupIds
DmsEndpointSource:
Type: AWS::DMS::Endpoint
Properties:
DatabaseName: !Ref SrcDbName
EndpointType: 'source'
EngineName: !Ref SrcDbEngine
ServerName: !Ref SrcDbServerName
Port: !Ref SrcDbPort
Username: !Ref SrcDbUsername
Password: !Ref SrcDbPassword
Tags:
-
Key: Name
Value: !Sub '${AWS::StackName}-dms-source-endpoint'
DmsEndpointTarget:
Type: AWS::DMS::Endpoint
Properties:
DatabaseName: !Ref DstDbName
EndpointType: 'target'
EngineName: !Ref DstDbEngine
ServerName: !Ref DstDbServerName
Port: !Ref DstDbPort
Username: !Ref DstDbUsername
Password: !Ref DstDbPassword
Tags:
-
Key: Name
Value: !Sub '${AWS::StackName}-dms-target-endpoint'
DmsReplicationTask:
Type: AWS::DMS::ReplicationTask
Properties:
MigrationType: !Ref DmsReplicationTaskMigrationType
ReplicationInstanceArn: !Ref ReplicationInstance
ReplicationTaskIdentifier: !Sub '${AWS::StackName}-dms-replication-task'
ReplicationTaskSettings:
!Sub
- |-
{
"TargetMetadata": {
"TargetSchema": "",
"SupportLobs": ${support_lobs},
"FullLobMode": false,
"LobChunkSize": 64,
"LimitedSizeLobMode": true,
"LobMaxSize": 32,
"InlineLobMaxSize": 0,
"LoadMaxFileSize": 0,
"ParallelLoadThreads": 0,
"ParallelLoadBufferSize": 0,
"BatchApplyEnabled": false,
"TaskRecoveryTableEnabled": false,
"ParallelLoadQueuesPerThread": 0,
"ParallelApplyThreads": 0,
"ParallelApplyBufferSize": 0,
"ParallelApplyQueuesPerThread": 0
},
"FullLoadSettings": {
"TargetTablePrepMode": "DROP_AND_CREATE",
"CreatePkAfterFullLoad": false,
"StopTaskCachedChangesApplied": false,
"StopTaskCachedChangesNotApplied": false,
"MaxFullLoadSubTasks": 8,
"TransactionConsistencyTimeout": 600,
"CommitRate": 10000
},
"Logging": {
"EnableLogging": ${enable_logging},
"LogComponents": [
{
"Id": "SOURCE_UNLOAD",
"Severity": "LOGGER_SEVERITY_DEFAULT"
},
{
"Id": "SOURCE_CAPTURE",
"Severity": "LOGGER_SEVERITY_DEFAULT"
},
{
"Id": "TARGET_LOAD",
"Severity": "LOGGER_SEVERITY_DEFAULT"
},
{
"Id": "TARGET_APPLY",
"Severity": "LOGGER_SEVERITY_DEFAULT"
},
{
"Id": "TASK_MANAGER",
"Severity": "LOGGER_SEVERITY_DEFAULT"
}
],
"CloudWatchLogGroup": null,
"CloudWatchLogStream": null
},
"ControlTablesSettings": {
"historyTimeslotInMinutes": 5,
"ControlSchema": "",
"HistoryTimeslotInMinutes": 5,
"HistoryTableEnabled": false,
"SuspendedTablesTableEnabled": false,
"StatusTableEnabled": false
},
"StreamBufferSettings": {
"StreamBufferCount": 3,
"StreamBufferSizeInMB": 8,
"CtrlStreamBufferSizeInMB": 5
},
"ChangeProcessingDdlHandlingPolicy": {
"HandleSourceTableDropped": true,
"HandleSourceTableTruncated": true,
"HandleSourceTableAltered": true
},
"ErrorBehavior": {
"DataErrorPolicy": "LOG_ERROR",
"DataTruncationErrorPolicy": "LOG_ERROR",
"DataErrorEscalationPolicy": "SUSPEND_TABLE",
"DataErrorEscalationCount": 0,
"TableErrorPolicy": "SUSPEND_TABLE",
"TableErrorEscalationPolicy": "STOP_TASK",
"TableErrorEscalationCount": 0,
"RecoverableErrorCount": -1,
"RecoverableErrorInterval": 5,
"RecoverableErrorThrottling": true,
"RecoverableErrorThrottlingMax": 1800,
"ApplyErrorDeletePolicy": "IGNORE_RECORD",
"ApplyErrorInsertPolicy": "LOG_ERROR",
"ApplyErrorUpdatePolicy": "LOG_ERROR",
"ApplyErrorEscalationPolicy": "LOG_ERROR",
"ApplyErrorEscalationCount": 0,
"ApplyErrorFailOnTruncationDdl": false,
"FullLoadIgnoreConflicts": true,
"FailOnTransactionConsistencyBreached": false,
"FailOnNoTablesCaptured": false
},
"ChangeProcessingTuning": {
"BatchApplyPreserveTransaction": true,
"BatchApplyTimeoutMin": 1,
"BatchApplyTimeoutMax": 30,
"BatchApplyMemoryLimit": 500,
"BatchSplitSize": 0,
"MinTransactionSize": 1000,
"CommitTimeout": 1,
"MemoryLimitTotal": 1024,
"MemoryKeepTime": 60,
"StatementCacheSize": 50
},
"PostProcessingRules": null,
"CharacterSetSettings": null,
"LoopbackPreventionSettings": null,
"BeforeImageSettings": null
}
-
enable_logging: !Ref DmsReplicationTaskEnableLogging
support_lobs: !Ref DmsReplicationTaskSupportLOBs
TableMappings:
!Sub
- |-
{
"rules": [
{
"rule-type": "selection",
"rule-id": "1",
"rule-action": "include",
"object-locator": {
"schema-name": "${db_schema_name}",
"table-name": "%"
},
"rule-name": "1"
}
]
}
-
db_schema_name: !Ref DbSchemaName
SourceEndpointArn: !Ref DmsEndpointSource
TargetEndpointArn: !Ref DmsEndpointTarget
Outputs:
DmsEndpointSource:
Description: DMS source Endpoint
Value: !Ref DmsEndpointSource
Export:
Name: !Sub '${AWS::StackName}-dms-source-endpoint'
DmsEndpointTarget:
Description: DMS target Endpoint
Value: !Ref DmsEndpointTarget
Export:
Name: !Sub '${AWS::StackName}-dms-target-endpoint'
ReplicationInstance:
Description: DMS Replication Instance
Value: !Ref ReplicationInstance
Export:
Name: !Sub '${AWS::StackName}-dms-replication-instance'
DmsReplicationTask:
Description: DMS Replication Task
Value: !Ref DmsReplicationTask
Export:
Name: !Sub '${AWS::StackName}-dms-replication-task'Summary
Of course, this is a very simple template, and not everything is parameterized, but I’m still hoping it saves you some time.
