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使用条件键
您可以指定决定 IAM policy 如何生效的条件。在 ElastiCache 中，您可以使用 JSON 策略的 Condition 元素将请求上下文中的键与您在策略中指定的键值进行比较。有关更多信息，请参阅 IAM JSON 策略元素：条件。
要查看 ElastiCache 条件键的列表，请参阅《服务授权参考》中的 Amazon ElastiCache 的条件键。
有关全局条件键的列表，请参阅 Amazon 全局条件上下文键。
指定条件：使用条件键
要实现精细控制，您需要编写 IAM 权限策略，用于指定控制某些请求上单独参数集的条件。然后，将该策略应用于您使用 IAM 控制台创建的 IAM 用户、组或角色。
要应用条件，请将条件信息添加到 IAM policy 语句。在以下示例中，您指定了条件，为创建的所有自行设计缓存群集使用节点类型 cache.r5.large。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:cluster:*", "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "StringEquals": { "elasticache:CacheNodeType": [ "cache.r5.large" ] } } } ] }
有关更多信息，请参阅基于标签的访问控制策略示例。
有关使用策略条件运算符的更多信息，请参阅 ElastiCache API 权限：操作、资源和条件参考。
策略示例：使用条件实现精细参数控制
此部分介绍对之前列出的 ElastiCache 参数实现精细访问控制的示例策略。
elasticache:MaximumDataStorage：指定无服务器缓存的最大数据存储量。使用提供的条件，客户不能创建存储超过特定数量数据的缓存。
{ "Version": "2012-10-17", "Statement": [ { "Sid": "AllowDependentResources", "Effect": "Allow", "Action": [ "elasticache:CreateServerlessCache" ], "Resource": [ "arn:aws:elasticache:*:*:serverlesscachesnapshot:*", "arn:aws:elasticache:*:*:snapshot:*", "arn:aws:elasticache:*:*:usergroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateServerlessCache" ], "Resource": [ "arn:aws:elasticache:*:*:serverlesscache:*" ], "Condition": { "NumericLessThanEquals": { "elasticache:MaximumDataStorage": "30" }, "StringEquals": { "elasticache:DataStorageUnit": "GB" } } } ] }elasticache:MaximumECPUPerSecond：指定无服务器缓存的每秒最大 ECPU 值。使用提供的条件，客户不能创建每秒执行的 ECPU 数超过特定数量的缓存。
{ "Version": "2012-10-17", "Statement": [ { "Sid": "AllowDependentResources", "Effect": "Allow", "Action": [ "elasticache:CreateServerlessCache" ], "Resource": [ "arn:aws:elasticache:*:*:serverlesscachesnapshot:*", "arn:aws:elasticache:*:*:snapshot:*", "arn:aws:elasticache:*:*:usergroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateServerlessCache" ], "Resource": [ "arn:aws:elasticache:*:*:serverlesscache:*" ], "Condition": { "NumericLessThanEquals": { "elasticache:MaximumECPUPerSecond": "100000" } } } ] }elasticache:CacheNodeType：指定用户可以创建哪些 NodeType。使用提供的条件，客户可以为节点类型指定单个值或范围值。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:cluster:*", "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "StringEquals": { "elasticache:CacheNodeType": [ "cache.t2.micro", "cache.t2.medium" ] } } } ] }elasticache:NumNodeGroups：创建节点组少于 20 个的复制组。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "NumericLessThanEquals": { "elasticache:NumNodeGroups": "20" } } } ] }elasticache:ReplicasPerNodeGroup：将每个节点的副本数指定为介于 5 到 10 之间。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "NumericGreaterThanEquals": { "elasticache:ReplicasPerNodeGroup": "5" }, "NumericLessThanEquals": { "elasticache:ReplicasPerNodeGroup": "10" } } } ] }elasticache:EngineVersion：指定引擎版本 5.0.6 的使用情况。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:cluster:*", "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "StringEquals": { "elasticache:EngineVersion": "5.0.6" } } } ] }elasticache:EngineType：指定仅使用 Redis 引擎。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:cluster:*", "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "StringEquals": { "elasticache:EngineType": "redis" } } } ] }elasticache:AtRestEncryptionEnabled：指定仅在已启用加密的情况下创建复制组。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "Bool": { "elasticache:AtRestEncryptionEnabled": "true" } } } ] }-
elasticache:TransitEncryptionEnabled
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针对 CreateReplicationGroup 操作将
elasticache:TransitEncryptionEnabled条件键设置为false，以指定只有在不使用 TLS 时才能创建复制组：{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "Bool": { "elasticache:TransitEncryptionEnabled": "false" } } } ] }当在策略中针对 CreateReplicationGroup 操作将
elasticache:TransitEncryptionEnabled条件键设置为false时，只有在不使用 TLS 时（即请求不包含设置为true的TransitEncryptionEnabled参数或设置为required的TransitEncryptionMode参数），才允许CreateReplicationGroup请求。 -
针对 CreateReplicationGroup 操作将
elasticache:TransitEncryptionEnabled条件键设置为true，以指定只有在使用 TLS 时才能创建复制组：{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "Bool": { "elasticache:TransitEncryptionEnabled": "true" } } } ] }当在策略中针对 CreateReplicationGroup 操作将
elasticache:TransitEncryptionEnabled条件键设置为true时，只有在请求包含设置为true的TransitEncryptionEnabled参数或设置为required的TransitEncryptionMode参数时，才允许CreateReplicationGroup请求。 -
针对
ModifyReplicationGroup操作将elasticache:TransitEncryptionEnabled设置为true，以指定只有在使用 TLS 时才能修改复制组：{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:ModifyReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "BoolIfExists": { "elasticache:TransitEncryptionEnabled": "true" } } } ] }当在策略中针对 ModifyReplicationGroup 操作将
elasticache:TransitEncryptionEnabled条件键设置为true时，只有在请求包含设置为required的TransitEncryptionMode参数时，才允许ModifyReplicationGroup请求。也可以选择包含设置为true的TransitEncryptionEnabled参数，但在这种情况下，该设置并不是启用 TLS 所必需的。
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elasticache:AutomaticFailoverEnabled：指定仅在已启用自动故障转移的情况下创建复制组。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "Bool": { "elasticache:AutomaticFailoverEnabled": "true" } } } ] } elasticache:MultiAZEnabled：指定不能在已禁用多可用区的情况下创建复制组。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Deny", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:cluster:*", "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "Bool": { "elasticache:MultiAZEnabled": "false" } } } ] }elasticache:ClusterModeEnabled：指定仅在已启用集群模式的情况下创建复制组。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "Bool": { "elasticache:ClusterModeEnabled": "true" } } } ] }elasticache:AuthTokenEnabled：指定仅在已启用 AUTH 令牌的情况下创建复制组。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:cluster:*", "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "Bool": { "elasticache:AuthTokenEnabled": "true" } } } ] }elasticache:SnapshotRetentionLimit：指定保留快照的天数（或最少/最多天数）。以下策略强制将备份存储至少 30 天。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup", "elasticache:CreateServerlessCache" ], "Resource": [ "arn:aws:elasticache:*:*:cluster:*", "arn:aws:elasticache:*:*:replicationgroup:*", "arn:aws:elasticache:*:*:serverlesscache:*" ], "Condition": { "NumericGreaterThanEquals": { "elasticache:SnapshotRetentionLimit": "30" } } } ] }elasticache:KmsKeyId：指定客户自主管理型 Amazon KMS 密钥的使用情况。
{ "Version": "2012-10-17", "Statement": [ { "Sid": "AllowDependentResources", "Effect": "Allow", "Action": [ "elasticache:CreateServerlessCache" ], "Resource": [ "arn:aws:elasticache:*:*:serverlesscachesnapshot:*", "arn:aws:elasticache:*:*:snapshot:*", "arn:aws:elasticache:*:*:usergroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateServerlessCache" ], "Resource": [ "arn:aws:elasticache:*:*:serverlesscache:*" ], "Condition": { "StringEquals": { "elasticache:KmsKeyId": "my-key" } } } ] }elasticache:CacheParameterGroupName：使用集群上某个企业的特定参数，指定非默认参数组。您还可以为参数组指定命名模式，或阻止删除特定参数组名称。以下是限制使用仅“my-org-param-group”的示例。
{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:cluster:*", "arn:aws:elasticache:*:*:replicationgroup:*" ], "Condition": { "StringEquals": { "elasticache:CacheParameterGroupName": "my-org-param-group" } } } ] }-
elasticache:CreateCacheCluster：如果请求标签
Project丢失或不等于Dev、QA或Prod，则拒绝CreateCacheCluster操作。{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*", "arn:aws:elasticache:*:*:securitygroup:*", "arn:aws:elasticache:*:*:replicationgroup:*" ] }, { "Effect": "Deny", "Action": [ "elasticache:CreateCacheCluster" ], "Resource": [ "arn:aws:elasticache:*:*:cluster:*" ], "Condition": { "Null": { "aws:RequestTag/Project": "true" } } }, { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:AddTagsToResource" ], "Resource": "arn:aws:elasticache:*:*:cluster:*", "Condition": { "StringEquals": { "aws:RequestTag/Project": [ "Dev", "Prod", "QA" ] } } } ] } elasticache:CacheNodeType：允许使用
cacheNodeTypecache.r5.large 或 cache.r6g.4xlarge 以及标签Project=XYZ来CreateCacheCluster。{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster", "elasticache:CreateReplicationGroup" ], "Resource": [ "arn:aws:elasticache:*:*:parametergroup:*", "arn:aws:elasticache:*:*:subnetgroup:*" ] }, { "Effect": "Allow", "Action": [ "elasticache:CreateCacheCluster" ], "Resource": [ "arn:aws:elasticache:*:*:cluster:*" ], "Condition": { "StringEqualsIfExists": { "elasticache:CacheNodeType": [ "cache.r5.large", "cache.r6g.4xlarge" ] }, "StringEquals": { "aws:RequestTag/Project": "XYZ" } } } ] }
注意
在创建策略以将标签和其他条件键一起强制执行时，由于使用 --tags 参数创建请求的额外 elasticache:AddTagsToResource 策略要求，条件键元素可能需要条件 IfExists。