Selectel Cloud Platform Documentation

https://docs.selectel.ru/en/
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### Example response for OpenSSH Client installation

Source: https://docs.selectel.ru/en/dedicated/manage/install-os-from-image.md

Example output from the OpenSSH Client installation command, showing Path, Online, and RestartNeeded fields.

```bash
Path          :
Online        : True
RestartNeeded : False
```

--------------------------------

### Start OS installation with qemu-iso

Source: https://docs.selectel.ru/en/dedicated/manage/install-os-from-image.md

Run the qemu-iso script to start a VNC server and initiate the OS installation from the uploaded image. Optionally specify -nic_type to change the virtual network adapter.

```bash
qemu-iso <path_to_image>
```

--------------------------------

### Start web server with Python

Source: https://docs.selectel.ru/en/cloud-servers/create/migrate-from-servers-ru.md

Starts a simple web server on port 80 to serve the downloaded snapshot for transfer. If Python is not installed, install it and restart the web server.

```bash
python3 -m http.server 80
```

--------------------------------

### Run the Cyber Backup agent installer

Source: https://docs.selectel.ru/en/cyber-backup/connect-cyber-backup.md

Start the installation of the Cyber Backup agent. Replace <agent_file> with the actual installer file name. After running, select 'Agent for Linux' and confirm installation of missing packages.

```bash
sudo <agent_file>
```

--------------------------------

### Example output of kubectl get pods

Source: https://docs.selectel.ru/en/managed-kubernetes/networks/loadbalancing-with-ingress/set-up-ingress?install-ingress-controller=with-configuring-loadbalancer

Example response showing the Traefik Ingress Controller pod running successfully.

```bash
NAME                       READY   STATUS    RESTARTS   AGE  
traefik-78d5c6f95b-2xk9p   1/1     Running   0          51s
```

--------------------------------

### Example response for OpenSSH Client check

Source: https://docs.selectel.ru/en/dedicated/manage/install-os-from-image.md

Example output from the OpenSSH Client check command, showing the component name and its State as Installed.

```bash
Name  : OpenSSH.Client~~~~0.0.1.0
State : Installed
```

--------------------------------

### Install nvidia-driver-550 example

Source: https://docs.selectel.ru/en/cloud-servers/manage/install-gpu-drivers.md

Example of installing the recommended driver version nvidia-driver-550 for an NVIDIA® Tesla T4 GPU.

```bash
sudo apt install -y nvidia-driver-550
```

--------------------------------

### Start Chrony service

Source: https://docs.selectel.ru/en/cloud-servers/manage/configure-ntp-sync.md

Starts the Chrony daemon after installation or configuration.

```bash
systemctl start chronyd
```

--------------------------------

### Install GRUB bootloader on new disk (OS booted)

Source: https://docs.selectel.ru/en/dedicated/troubleshooting/replace-disk-raid.md

When the server is booted into the OS, first list partitions with lsblk to identify the new disk (e.g., sdb), then install GRUB on that disk. Replace <new_disk> with the actual disk name from the lsblk output.

```bash
lsblk -o +FSTYPE
```

```bash
NAME             MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT  FSTYPE
loop0              7:0    0   985M  1 loop
sda                8:0    0 931.5G  0 disk
├─sda1             8:1    0   500M  0 part              vfat
├─sda2             8:2    0   977M  0 part
│ └─md0            9:0    0 976.4M  0 raid1             ext4
└─sda3             8:3    0 930.1G  0 part
  └─md1            9:1    0 929.9G  0 raid1  / 
sdb                8:16   0 931.5G  0 disk
├─sdb1             8:17   0   500M  0 part          
├─sdb2             8:18   0   977M  0 part
│ └─md0            9:0    0 976.4M  0 raid1             ext4
└─sdb3             8:19   0 930.1G  0 part
  └─md1            9:1    0 929.9G  0 raid1  /          ext4 
```

```bash
grub-install /dev/<new_disk>
```

--------------------------------

### Check MPIO installation with Get-WindowsFeature

Source: https://docs.selectel.ru/en/data-storage-system/manage/connect-lun-to-server.md

Check if MPIO is installed on a Windows server. The example output shows the feature is installed.

```bash
Get-WindowsFeature -Name Multipath-IO
```

```bash
Display Name                            Name          Install State
------------                            ----          --------------
[X] Multipath I/O                       Multipath-IO  Installed
```

--------------------------------

### List disks with lsblk and example output

Source: https://docs.selectel.ru/en/cloud-servers/volumes/edit-volume.md

Run lsblk to list all disks connected to the server. The example output shows the disk layout, including partitions and sizes.

```bash
lsblk
```

```bash
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda       8:0    0    8G  0 disk
├─sda1    8:1    0    8G  0 part /
└─sda14   8:14   0    8M  0 part
sdb       8:16   0    7G  0 disk
```

--------------------------------

### Install Kubeflow components with kustomize

Source: https://docs.selectel.ru/en/ml-platform/quickstart/install-kubeflow.md

Builds the Kubeflow example manifests with kustomize and applies them with kubectl, retrying every 10 seconds until the apply succeeds.

```bash
while ! kustomize build example | kubectl apply -f -; do echo "Retrying to apply resources"; sleep 10; done
```

--------------------------------

### Start Prometheus locally

Source: https://docs.selectel.ru/en/cloud-servers/load-balancers/manage/monitoring.md

Installs `screen` and starts Prometheus in a detached screen session, listening on localhost:9090.

```bash
sudo apt install screen
screen -dm ./prometheus --config.file=./prometheus.yml --web.listen-address=localhost:9090
```

--------------------------------

### POST /boot/os/{resource_uuid}

Source: https://docs.selectel.ru/en/api/dedicated.json

Installs a new operating system configuration on the server.

```APIDOC
## [POST] /boot/os/{resource_uuid}

### Description
Installs a new operating system configuration on the server.

### Method
POST

### Endpoint
/boot/os/{resource_uuid}

### Parameters
#### Path Parameters
- **resource_uuid** (string) - Required - Resource unique identifier (UUID).

#### Request Body
- **payload** (OSConfigInput) - Required - Operating system configuration input.

### Response
#### Success Response (200)
- **ResponseOSConfig** - Operating system configuration.

#### Response Example
{
  "$ref": "#/definitions/ResponseOSConfig"
}
```

--------------------------------

### Install mysql2 library

Source: https://docs.selectel.ru/en/managed-databases/mysql-semi-sync/connect-to-cluster.md

Run this command to install the mysql2 library, which is required for the Node.js connection example.

```bash
npm install mysql2
```

--------------------------------

### Example of a configured flavor

Source: https://docs.selectel.ru/en/cloud-servers/create/create-server-with-usb-device.md

Example flavor with 2 vCPUs, 2 GB RAM, and 80 GB local disk. Note the missing space after --private and --ram in the example.

```bash
openstack flavor create \
    --private\
    --vcpus 2\
    --ram 2048\
    --disk 80\
    new_flavor
```

--------------------------------

### Example output of docker image list

Source: https://docs.selectel.ru/en/craas/charts/delete-chart.md

Example response showing a list of repositories and Docker images with columns for repository, tag, image ID, created date, and size.

```txt
+----------------------------------+--------+----------------+-----------------+-------------+
| REPOSITORY                       | TAG    |IMAGE ID        |CREATED          | SIZE        |
+----------------------------------+--------+----------------+-----------------+-------------+
| stage.cr.selcloud.org/test/nginx | 9      |   77af4d6b9913 |    6 days ago   |    824.5 MB |
| cr.selcloud.ru/test/nginx        | latest |   78a85c484f71 |    19 hours ago |    656.2 MB |
| nginx                            | 9.3    |   5ed6274db6ce |    3 months ago |    218.5 MB |
| cr.selcloud.ru/test/busybox      | 9.3.5  |   92d3114nv8op |    5 months ago |    1.089 GB |
+----------------------------------+--------+----------------+-----------------+-------------+
```

--------------------------------

### Connect to Redis with ioredis (Node.js)

Source: https://docs.selectel.ru/en/managed-databases/redis/connect-to-cluster.md

Installs the ioredis client via npm and connects to a Redis cluster. Replace <host>, <port>, and <password> with your node's DNS address or public floating IP, connection port, and user password. The example sets and gets a key, then disconnects.

```bash
npm install ioredis
```

```js
const Redis = require('ioredis');

const config = {
  host: '<host>',
  port: <port>,
  password: '<password>',
};

const connection = new Redis(config);

connection.set('key', 'value', (error) => {
  if (error) throw error;
});

connection.get('key', (error, res) => {
  if (error) throw error;
  console.log(res);
  connection.disconnect();
});
```

--------------------------------

### Example lsblk output (no LVM)

Source: https://docs.selectel.ru/en/dedicated/troubleshooting/mount-file-system.md

Example response showing partition names such as sda1, sdb1, sdb14, sdb15.

```bash
NAME    MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
sda       8:0    0   2.9G  0 disk
└─sda1    8:1    0   2.9G  0 part
sdb       8:16   0   160G  0 disk
├─sdb1    8:17   0 159.9G  0 part
├─sdb14   8:30   0     4M  0 part
└─sdb15   8:31   0   106M  0 part
```

--------------------------------

### Connect to OpenSearch with Go client

Source: https://docs.selectel.ru/en/managed-databases/opensearch/connect-to-cluster.md

Download the root certificate and place it in ~/.opensearch/, then use the Go client to connect to OpenSearch. Replace <path>, <host_1>, <host_2>, <port>, and <password> with your values.

```bash
mkdir -p ~/.opensearch/
wget https://storage.dbaas.selcloud.ru/CA.pem -O ~/.opensearch/root.crt
chmod 0600 ~/.opensearch/root.crt
```

```go
package main

import (
    "crypto/tls"
    "crypto/x509"
    "fmt"
    "io/ioutil"
    "github.com/opensearch-project/opensearch-go"
    "net/http"
    "os"
)

func main() {
    caCert, err := ioutil.ReadFile("<path>")
    if err != nil {
        fmt.Println("failed to read CA certificate: %w", err)
        os.Exit(1)
    }

    caCertPool := x509.NewCertPool()
    if ok := caCertPool.AppendCertsFromPEM(caCert); !ok {
        fmt.Println("failed to append CA certificate")
    }

    client, err := opensearch.NewClient(opensearch.Config{
        Transport: &http.Transport{
        TLSClientConfig: &tls.Config{RootCAs: caCertPool},
        },
        Addresses: []string{
                            "https://<host_1>:<port>",
                            "https://<host_2>:<port>"
                        },
        Username:  "admin",
        Password:  "<password>",
    })
    if err != nil {
        fmt.Println("cannot initialize", err)
        os.Exit(1)
    } else {
        fmt.Println(client.Info())
    }
}
```

--------------------------------

### Connect to Redis with Predis (PHP)

Source: https://docs.selectel.ru/en/managed-databases/redis/connect-to-cluster.md

Installs the predis library via Composer and connects to a Redis cluster using Predis. Replace <host>, <port>, and <password> with your node's DNS address or public floating IP, connection port, and user password. The example sets and gets a key, then disconnects.

```bash
composer require predis/predis
```

```php
<?php
    require __DIR__ . '/vendor/autoload.php';
    Predis\Autoloader::register();

    $host = ['<host>:<port>'];
    $options = [
      'parameters' => [
        'password' => "<password>"
      ],
      'cluster' => 'predis'
    ];

    $conn = new Predis\Client($host, $options);

    $conn->set('KEY', 'VALUE');
    var_dump($conn->get('KEY'));

    $conn->disconnect();
?>
```

--------------------------------

### Install go-selvpcclient with go get

Source: https://docs.selectel.ru/en/cloud-servers/tools/selvpc.md

Downloads the go-selvpcclient package for the Go library. Run this before creating a service user for authentication.

```sh
go get github.com/selectel/go-selvpcclient/selvpcclient/v3
```

--------------------------------

### Boot Instance, Create Volume, and Attach Volume as a Block Device

Source: https://docs.selectel.ru/en/terraform/openstack-provider-reference/compute-nova/resources/openstack_compute_instance_v2.md

Boots an instance from an image on local storage and creates a blank volume attached as a block device with boot_index 1.

```hcl
resource "openstack_compute_instance_v2" "instance_1" {
  name            = "instance_1"
  image_id        = "<image-id>"
  flavor_id       = "1311"
  key_pair        = "<key-pair-name>"

  block_device {
    uuid                  = "<image-id>"
    source_type           = "image"
    destination_type      = "local"
    boot_index            = 0
    delete_on_termination = true
  }

  block_device {
    source_type           = "blank"
    destination_type      = "volume"
    volume_size           = 5
    boot_index            = 1
    delete_on_termination = true
  }
}
```

--------------------------------

### Example output of getUsableSectors

Source: https://docs.selectel.ru/en/block-storage/manage/connect-block-storage-to-esxi.md

Example output from partedUtil getUsableSectors showing the start sector (2048) and end sector (314572766).

```bash
2048 314572766
```

--------------------------------

### Install MinIO Client on Linux

Source: https://docs.selectel.ru/en/s3/tools/minio-client.md

Install MinIO Client on Linux by downloading the binary, making it executable, and adding it to the PATH.

```bash
curl https://dl.min.io/client/mc/release/linux-amd64/mc \
    --create-dirs \
    -o $HOME/minio-binaries/mc

chmod +x $HOME/minio-binaries/mc
export PATH=$PATH:$HOME/minio-binaries/
```

--------------------------------

### Install kafka-python library

Source: https://docs.selectel.ru/en/managed-databases/kafka/connect-to-cluster.md

Installs the kafka-python Python library using pip. Required before using the kafka-python consumer example.

```bash
pip install kafka-python
```

--------------------------------

### Install confluent-kafka library

Source: https://docs.selectel.ru/en/managed-databases/kafka/connect-to-cluster.md

Installs the confluent-kafka Python library using pip. Required before using the confluent-kafka consumer and producer examples.

```bash
pip install confluent-kafka
```
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