---
title: "Change cloud server configuration"
sidebar_label: "Change server configuration"
sidebar_position: 3
description: "How to change the configuration of a cloud server, increase the number of vCPUs, RAM, and disk size"
---

import Tabs from '@theme/Tabs'
import TabItem from '@theme/TabItem'
import {TabItemLabel} from '@selectel/docux/components'
import Formbricks from '@theme/MDXComponents/Formbricks'

# Change cloud server configuration

You can change the cloud server [configuration](/cloud-servers/create/configurations.mdx) and the amount of resources:

* select a different lineup and fixed configuration (except for the GPU lineup);
* change a fixed configuration to a custom configuration (except for the GPU lineup);
* change the amount of resources in a fixed or custom configuration — vCPU, RAM, local disk size;
* change a custom configuration to a fixed configuration.

A cloud server configuration with a local disk cannot be changed to a configuration without a local disk and vice versa.

You can [add graphics processors](/cloud-servers/manage/add-gpu-to-existing-server.mdx) to servers of custom configuration.

All data on the cloud server is preserved when changing the configuration.

## Change server configuration \{#change-server-configuration}

:::danger

The cloud server will be unavailable while the configuration is being changed.

:::

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  <TabItem value="panel" default>
    <TabItemLabel>
      Control panel
    </TabItemLabel>

    1. In the [Control panel](https://my.selectel.ru/vpc/default/servers/), on the top menu, click **Products** and select **Cloud Servers**.

    2. Open the server page → **Configuration** tab.

    3. Click **Change configuration**.

    4. In the **Configuration** block, select a new configuration. If you need to add a GPU to a cloud server, select the **GPU** line.

    5. Optional: you can adjust the configuration if the cloud server is created in the [multi-zone pool](/infrastructure/locations.mdx#multi-az-pool) segment ru-6 or pool segments ru-3b, ru-7a, and ru-7b:

       5.1. Expand the configuration settings description block.

       5.2. Optional: select the processor manufacturer. Manufacturer selection is not available in all pools.

       5.3. Optional: if you want physical processor cores to be pinned to the cloud server vCPUs, select the **Dedicated Cores** checkbox. For more information, see the [Dedicated Cores](/cloud-servers/about/dedicated-cores.mdx) instruction.<br />If you have a cloud server with dedicated cores and need to disable them, uncheck the **Dedicated Cores** checkbox.

       5.4. Optional: if the cloud server has dedicated cores and you want to enable [Hyper-Threading](/cloud-servers/about/dedicated-cores.mdx#hyper-threading), select the **Hyper-Threading (SMT)** checkbox. To disable hyper-threading, clear the **Hyper-Threading (SMT)** checkbox.

       5.5. Optional: if the cloud server has dedicated cores and you want to place processor resources on one NUMA node, select the **Mandatory placement on a single NUMA node** checkbox. To not place cloud server resources on a single NUMA node, clear the **Mandatory placement on a single NUMA node** checkbox. If the cloud server resources cannot be placed on one node, the modified configuration will not be applied. For more information, see the [Placement on a single NUMA node](/cloud-servers/about/dedicated-cores.mdx#placing-on-one-numa-node) section of the [Dedicated Cores](/cloud-servers/about/dedicated-cores.mdx) instruction.

    6. Specify the required amount of resources.

    7. Click **Save and reboot**.
  </TabItem>

  <TabItem value="openstack">
    <TabItemLabel>
      OpenStack CLI
    </TabItemLabel>

    1. [Open the OpenStack CLI](/cloud-servers/tools/openstack-cli/).

    2. Change the cloud server configuration:

       ```bash
       openstack server resize --flavor <flavor> <server>
       ```

       Specify:

       * `<flavor>` — the flavor ID or name. Flavors correspond to [cloud server configurations](/cloud-servers/create/configurations.mdx) and determine the number of vCPUs, RAM, and the local disk size of the server. You can use fixed configuration flavors or [create a flavor](/cloud-servers/create/create-flavor.mdx). You can view the list of flavors using the `openstack flavor list` command or in the [List of fixed configuration flavors in all pools](/cloud-servers/create/configurations.mdx#server-flavors-full-list) table;
       * `<server>` — the server ID or name. You can view the server list using the `openstack server list` command.
  </TabItem>
</Tabs>

<Formbricks />