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Accessing Public Networks from a Container
You can use NAT Gateway to enable containers in a VPC to access public networks. NAT Gateway provides source network address translation (SNAT), which translates private IP addresses to a public IP address by binding an EIP to the NAT gateway, providing secure and efficient access to the Internet. Figure 1 shows the SNAT architecture. The SNAT function allows the pods in a VPC to access the Internet without being bound to an EIP. SNAT supports a large number of concurrent connections, which makes it suitable for applications involving a large number of requests and connections.
To enable pods to access the Internet, perform the following steps:
- Buy an EIP.
- Log in to the management console.
- Click
in the upper left corner to select the desired region and project.
- Choose Service List > Networking > Virtual Private Cloud.
- In the navigation pane, choose Elastic IP and Bandwidth > EIPs.
- On the EIPs page, click Buy EIP.
- Set the parameters.
NOTE:
Set Region to the region where pods are located.
Figure 2 Buying an EIP - Buy a NAT gateway. For details, see Buy a Public NAT Gateway.
- Log in to the management console.
- Click
in the upper left corner to select the desired region and project.
- Choose Service List > Networking > NAT Gateway.
- On the displayed page, click Buy NAT Gateway.
- Set the parameters.
NOTE:
Select the VPC and subnet that you have configured for the namespace where the pods are located.
Figure 3 Buying a NAT gateway
- Configure an SNAT rule and bind the EIP to the subnet. For details, see Add an SNAT Rule.
- Log in to the management console.
- Click
in the upper left corner to select the desired region and project.
- Choose Service List > Networking > NAT Gateway.
- On the displayed page, click the name of the NAT gateway for which you want to add the SNAT rule.
- On the SNAT Rules tab page, click Add SNAT Rule.
- Set the parameters.
Figure 4 Adding an SNAT ruleAfter the SNAT rule is configured, public networks can be accessed from the container.
Figure 5 Accessing public networks from a container
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