如何使用 cloudformation 模板创建 Amazon RDS aurora Master 和只读副本集群

Posted 2023-03-04

【中文标题】如何使用 cloudformation 模板创建 Amazon RDS aurora Master 和只读副本集群

【英文标题】：How to create Amazon RDS aurora Master and read replica cluster using cloudformation template

【发布时间】：2017-01-15 23:03:20

【问题描述】：

使用 cloudformation 模板创建 Amazon RDS Master 和只读副本集群。

【参考方案1】：

我们可以使用以下 cloudformation 模板创建 Amazon Aurora RDS。只是我们需要在创建堆栈时传递我们的参数。

"AWSTemplateFormatVersion": "2010-09-09",
"Description": "Aurora Db Stack",
"Parameters": 
    "EnvironmentName": 
        "Description": "The string that will be prefixed to each instance name",
        "Type": "String",
        "MinLength": "3",
        "MaxLength": "6",
        "AllowedPattern": "[a-z0-9]*",
        "ConstraintDescription": "Environment names must be 3-6 characters and contain only a-z and 0-9."
    ,
    "DbUsername": 
        "Description": "App Db Username",
        "Type": "String",
        "MinLength": "5",
        "MaxLength": "15",
        "AllowedPattern": "[a-zA-Z][a-zA-Z0-9]*",
        "ConstraintDescription": "must begin with a letter and contain only alphanumeric characters."
    ,
    "DbPassword": 
        "Description": "App Db Password",
        "NoEcho": "true",
        "Type": "String",
        "MinLength": "15",
        "MaxLength": "41",
        "AllowedPattern": "[a-zA-Z0-9]*",
        "ConstraintDescription": "App Db Password must be 15-41 characters and contain only alpha numeric characters."
    ,
    "DbType": 
        "Description": "App Db server RDS instance type",
        "Type": "String",
        "Default": "db.r3.large",
        "AllowedValues": [
            "db.r3.large",
            "db.r3.xlarge",
            "db.r3.2xlarge",
            "db.r3.4xlarge",
            "db.r3.8xlarge"
        ],
        "ConstraintDescription": "must be a valid RDS instance type."
    ,
    "DBIdentifierNameMaster": 
        "Description": "The string that will be prefixed to each instance name",
        "Type": "String",
        "MinLength": "3",
        "MaxLength": "10",
        "AllowedPattern": "[a-z0-9]*",
        "ConstraintDescription": "Identifier names must be 3-6 characters and contain only a-z and 0-9."
    ,
    "DBIdentifierNameReplica": 
        "Description": "The string that will be prefixed to each instance name",
        "Type": "String",
        "MinLength": "3",
        "MaxLength": "10",
        "AllowedPattern": "[a-z0-9]*",
        "ConstraintDescription": "Identifier names must be 3-10 characters and contain only a-z and 0-9."
    ,
    "Subnets": 
        "Type": "CommaDelimitedList",
        "Default": "subnet-8ec5b8e6,subnet-1edcc277",
        "Description": "The list of SubnetIds where the stack will be launched"
    ,
    "DBSecurityGroupName": 
        "Type": "String",
        "Description": "Security Group id"
    
,
"Resources": 
    "DBSubnetGroup": 
        "Type": "AWS::RDS::DBSubnetGroup",
        "Properties": 
            "DBSubnetGroupDescription": "Dev DB subent groups",
            "SubnetIds": 
                
                    "Ref": "Subnets"
                ,

            "Tags": [
                
                    "Key": "Name",
                    "Value": 
                        "Fn::Join": [
                            "",
                            [
                                "PROJECT_NAME-",
                                
                                    "Ref": "EnvironmentName"
                                ,
                                "-db"
                            ]
                        ]
                    
                
            ]
        
    ,
    "DBCluster": 
        "Type": "AWS::RDS::DBCluster",
        "Properties": 
            "Engine": "aurora",
            "MasterUsername": 
                "Ref": "DbUsername"
            ,
            "MasterUserPassword": 
                "Ref": "DbPassword"
            ,
            "DBSubnetGroupName": 
                "Ref": "DBSubnetGroup"
            ,
            "VpcSecurityGroupIds": [
                
                    "Ref": "DBSecurityGroupName"
                
            ]
        
    ,
    "RDSinstance": 
        "Type": "AWS::RDS::DBInstance",
        "Properties": 
            "DBClusterIdentifier": 
                "Ref": "DBCluster"
            ,
            "DBInstanceIdentifier": 
                "Ref": "DBIdentifierNameMaster"
            ,
            "DBInstanceClass": 
                "Ref": "DbType"
            ,
            "Engine": "aurora",
            "DBParameterGroupName": 
                "Ref": "DbParameterGroup"
            ,
            "DBSubnetGroupName": 
                "Ref": "DBSubnetGroup"
            ,
            "PubliclyAccessible": "true",
            "Tags": [
                
                    "Key": "Name",
                    "Value": 
                        "Fn::Join": [
                            "",
                            [
                                "Master Database-",
                                
                                    "Ref": "EnvironmentName"
                                ,
                                "-app-db"
                            ]
                        ]
                    
                
            ]
        
    ,
    "RDSinstance2": 
        "Type": "AWS::RDS::DBInstance",
        "Properties": 
            "DBClusterIdentifier": 
                "Ref": "DBCluster"
            ,
            "DBInstanceIdentifier": 
                "Ref": "DBIdentifierNameReplica"
            ,
            "DBInstanceClass": 
                "Ref": "DbType"
            ,
            "Engine": "aurora",
            "DBParameterGroupName": 
                "Ref": "DbParameterGroup"
            ,
            "DBSubnetGroupName": 
                "Ref": "DBSubnetGroup"
            ,
            "PubliclyAccessible": "true",
            "Tags": [
                
                    "Key": "Name",
                    "Value": 
                        "Fn::Join": [
                            "",
                            [
                                "Read Replica Database-",
                                
                                    "Ref": "EnvironmentName"
                                ,
                                "-app-db"
                            ]
                        ]
                    
                
            ]
        
    ,
    "DbParameterGroup": 
        "Type": "AWS::RDS::DBParameterGroup",
        "Properties": 
            "Description": "AppDbParameters",
            "Family": "aurora5.6",
            "Parameters": 
                "log_bin_trust_function_creators": "on",
                "explicit_defaults_for_timestamp": "0"
            
        
    

【讨论】：

它怎么知道哪个是master？你先定义的那个是主人吗？

您可以指定要命名为主或从的标识符，但在创建集群后，如果有任何故障转移，则读取副本或读取状态将改变，反之亦然。它不会将您的标识符名称用于故障转移。