This architecture uses ingress and egress rules in the security lists attached to the application server and database subnets. Another route rule sends traffic from the servers attached to the private subnets to the internet through the NAT gateway.įor each subnet, you can create security rules that specify the source, destination, and type of traffic that must be allowed in and out of the subnet. Infrastructure Object Storage through the service gateway. This architecture uses a route rule to send traffic from the database subnet to Oracle Cloud Virtual route tables contain rules to route traffic from subnets to destinations outside a VCN, typically through gateways. In this architecture, the database and application tiers use separate subnets. You can change the size of a subnet after creation. Each subnet consists of a contiguous range of addresses that don't overlap with the other subnets in the VCN. You can segment a VCN into subnets, which can be scoped to a region or to an availability domain. A VCN can have multiple non-overlapping CIDR blocks that you can change after you create the VCN. Like traditional data center networks, VCNs give you complete control over your network environment. Virtual cloud network (VCN) and subnetsĪ VCN is a customizable, software-defined network that you set up in an Oracle Cloud.When you distribute resources across multiple fault domains, your applications can tolerate physical server failure, system maintenance, and power failures inside a fault domain. Each availability domain has three fault domains with independent power and hardware. So, a failure at one availability domain is unlikely to affect the other availability domains in the region.Ī fault domain is a grouping of hardware and infrastructure within an availability domain. Availability domains don’t share infrastructure such as power or cooling, or the internal availability domain network. The physical resources in each availability domain are isolated from the resources in the other availability domains, which provides fault tolerance. Regions are independent of other regions, and vast distances can separate them (across countries or even continents).Īvailability domains are standalone, independent data centers within a region. Infrastructure region is a localized geographic area that contains one or more data centers, called availability domains. The architecture assumes that the on-premises servers are running Oracle Linux. The on-premises network is connected to an Oracle Cloud region using IPSec VPN or FastConnect. The database server is connected to a storage device. The on-premises deployment includes an application server and an instance of Oracle Database Standard Edition on a 4-core Intel server. The architecture has the following components: This architecture shows the resources and topology required to migrate an on-premises deployment of Oracle Database Standard Edition to a single-node, VM DB System in Oracle Cloudĭescription of the illustration migrate-vmdb.png
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