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Public IP address

Public IP address

A public IP address is a static public IP address that is assigned to a node to set up access to the node on the private network from the Internet. External traffic goes through the public IP address and is handled by the cloud router, which acts as a 1:1 NAT. The address is a floating IP because it can automatically switch when the role changes from replica to master and back again. It will not change or be removed from the panel.

The private subnet on which you can assign a public IP address must meet the requirements — prepare the subnet before adding a public IP address.

A public IP address can be added:

The number of public IP addresses in the cluster can be less than the number of nodes in the group, but cannot exceed it. If necessary, you can disable the public IP address.

Private subnet requirements⁠

  • The subnet should have a cloud router with a connection to an external network;
  • The IP address of the cloud router should be the default gateway on the subnet.

If the subnet does not meet the requirements, prepare it to connect a public IP address.

Prepare a private subnet to connect a public IP address⁠

  1. Create a cloud router with a connection to an external network.
  2. Connect the private network to the cloud router.

1. Create a cloud router with a connection to an external network⁠

A cloud router allows you to route traffic between private networks.

You can use the router to configure access to the Internet from a private network or to access a device on a private subnet from the Internet using a public IP address.

  1. In the dashboard, on the top menu, click Products and select Cloud Servers.
  2. Go to Network → Cloud routers tab.
  3. Click Create router.
  4. Select the pool where the cloud router will be created.
  5. Enter the name of the router.
  6. Check the box Connect router to external network — an external IP address will be assigned to the router.
  7. Click Create.

2. Connect a private network to the cloud router⁠

  1. In the Control panel, on the top menu, click Products and select Cloud Servers.

  2. Go to Network → Cloud routers tab.

  3. Open the router card.

  4. Click Add Subnet.

  5. Select a private subnet.

  6. Enter the IP address of the router. The IP address of the cloud router must match the default gateway of the private subnet. You can view the gateway in the control panel: in the top menu, click Products → Cloud Servers → Network → Private Networks tab → Network page → Subnets tab → Subnet card → Automatic Network Settings block → Subnet Gateway field.

    If you are connecting a global router subnet, the IP address of the cloud router must match the default gateway of the global router subnet and must be different from the global router IP address, the IP addresses of the devices on the network, and the .253 and .254 service addresses.

  7. Click Add Subnet.

Connect a public IP address⁠

  1. Ensure that the cluster is on a private subnet that meets the requirements.
  2. In the Control panel, on the top menu, click Products and select Cloud Databases.
  3. Open the Active tab.
  4. Open the Database Cluster page → Settings tab.
  5. In the Node Addresses and Statuses block, in the row with the desired node, click Connect Public IP.
  6. Click Connect.

Disable public IP address⁠

  1. In the Control panel, on the top menu, click Products and select Cloud Databases.
  2. Open the Active tab.
  3. Open the Database Cluster page → Settings tab.
  4. In the Node Addresses and Statuses block, in the row with the desired node, click .
  5. Click Delete.