---
title: "Configure network access to PostgreSQL for 1C cluster"
sidebar_label: "Configure network access to cluster"
description: "How to define the list of allowed IP addresses, basic information about security groups in a PostgreSQL for 1C database cluster, and how to assign a security group"
sidebar_position: 15
---

import Formbricks from '@theme/MDXComponents/Formbricks'
import PlusIcon from '@selectel/docux/icons/plus'
import ShieldOkIcon from '@selectel/docux/icons/shield-ok'
import CheckIcon from '@selectel/docux/icons/check'

# Configure network access to PostgreSQL for 1C cluster

By default, in clusters with a public subnet, connections are allowed from all addresses if a login and password are provided.

To a cluster in a private subnet, connection is allowed from the cluster subnet and from subnets connected to the cluster subnet via a cloud router.

You can [define a list of allowed IP addresses](#define-allowed-ip-addresses-list) from which access to the Managed Databases cluster will be allowed.

You can also use [security groups](#security-groups-in-managed-databases) to restrict access to the Managed Databases cluster.

Any changes to network access settings are the customer's responsibility.

## Define a list of allowed IP addresses \{#define-allowed-ip-addresses-list}

When restoring a cluster from a backup, the list of allowed IP addresses is not preserved — you will need to re-specify the allowed IP addresses for the new cluster.

1. In the [Control panel](https://my.selectel.ru/vpc/default/dbaas/), in the top menu, click **Products** and select **Managed Databases**.
2. Open the **Active** tab.
3. Open the database cluster page → **Settings** tab.
4. In the **Network access control** section, click the **Allowed addresses and subnet CIDRs** field.
5. At the bottom of the drop-down list, enter the subnet CIDR or IP address from which access to the cluster should be allowed. Only IPv4 addressing is supported.
6. Click <PlusIcon />.
7. Repeat steps 5 and 6 for all allowed IP addresses.
8. Click **Save**. Connection will be denied to all IP addresses except those specified in the allowed list.

## Security groups in a Managed Databases cluster \{#security-groups-in-managed-databases}

A security group in a Managed Databases cluster is a set of rules for filtering inbound and outbound cluster traffic. For security groups to work, [traffic filtering (port security)](/cloud-servers/cloud-networks/about-networks.mdx#traffic-filtering-port-security) must be enabled in the network.

If filtering is enabled in the network, then all [ports](/cloud-servers/cloud-networks/ports.mdx) in this network are assigned the [default security group](/cloud-servers/security-groups/about/about-security-groups.mdx#default-security-group), which allows all traffic through the ports. You can assign a different security group when [creating a cluster](/managed-databases/postgresql-for-1c/create-cluster.mdx) or in an [existing cluster](#assign-security-group-in-existing-cluster).

In addition to the security groups you select when creating a cluster, a service security group is automatically assigned to the Managed Databases cluster network ports. This group ensures cluster operation and cannot be modified or deleted. The service group is only displayed in the OpenStack CLI and Terraform.

Learn more about security groups in the [Security groups](/cloud-servers/security-groups/) section.

### Assign a security group in an existing cluster \{#assign-security-group-in-existing-cluster}

:::warning

After assigning the group, all active sessions that do not match the group rules will be terminated.

:::

1. Make sure that [traffic filtering (port security)](/cloud-servers/cloud-networks/about-networks.mdx#traffic-filtering-port-security) is enabled in the cluster network. To do this, in the [Control panel](https://my.selectel.ru/vpc/default/networks), in the top menu, click **Products** → **Cloud Servers** → **Network** → **Private networks** or **Public networks** tab. A network with filtering enabled is marked with <ShieldOkIcon />.

   If filtering is disabled, to use security groups, create a new cluster in a new subnet or in a subnet with traffic filtering enabled and migrate data using a [logical dump](/managed-databases/postgresql-for-1c/database-migration.mdx).

2. In the [Control panel](https://my.selectel.ru/vpc/default/dbaas/), in the top menu, click **Products** and select **Managed Databases**.

3. Open the **Active** tab.

4. Open the database cluster page → **Settings** tab.

5. In the **Security** block, click **Edit**.

6. Select the security group you want to assign to all [ports](/cloud-servers/cloud-networks/ports.mdx) in the cluster network.

7. Click <CheckIcon />.

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