Creating an instance group from a Container Optimized Image with multiple Docker containers

Written by

Updated at November 21, 2024

Getting started
Prepare the environment
Create an instance group from a Container Optimized Image with multiple Docker containers
Test the instance group based on the Container Optimized Image with multiple Docker containers

You can create an instance group based on a Container Optimized Image image with multiple Docker containers inside.

Docker containers are created based on the Docker Compose specification.

Alert

When creating instance groups, keep the limits in mind. Not to disrupt the component Instance Groups, do not update or delete manually created resources: target group Network Load Balancer, VMs, and disks. Instead of this, change or delete the entire group.

Getting started

If you do not have the Yandex Cloud command line interface yet, install and initialize it.

The folder specified in the CLI profile is used by default. You can specify a different folder using the --folder-name or --folder-id parameter.

Prepare the environment

Create a service account named group-coi and assign it the editor role:
Management console

CLI

API
1. In the management console, select the folder where you want to create your service account.
2. In the list of services, select Identity and Access Management.
3. Click Create service account.
4. Enter the name: group-coi.
5. To assign the service account the editor role for the current folder, click Add role and select editor.
6. Click Create.
1. Create a service account:
  yc iam service-account create --name group-coi
  Result:
  id: ajeabccde01d******** folder_id: b0g12ga82bcv******** created_at: "2023-03-13T14:32:18.900092Z" name: group-coi
2. Assign the role to the service account:
  yc resource-manager folder add-access-binding b0g12ga82bcv******** \ --role editor \ --subject serviceAccount:ajeabccde01d********
Use the Create method for the ServiceAccount resource.
Create a network named yc-auto-network and a subnet in the same availability zone:
Management console

CLI

API
1. In the management console, select the folder you want to create a network in.
2. Select Virtual Private Cloud.
3. Click Create network.
4. Enter the network name: yc-auto-network.
5. Select the additional option: Create subnets.
6. Click Create network.
1. Create a network:
  yc vpc network create --name yc-auto-network
  Result:
  id: enpabce123hd******** folder_id: b0g12ga82bcv******** created_at: "2023-03-13T14:57:15Z" name: yc-auto-network
2. Create a subnet in the ru-central1-a availability zone:
  yc vpc subnet create --network-id enpabce123hd******** --range 192.168.1.0/24 --zone ru-central1-a
  Result:
  id: e1lnabc23r1c******** folder_id: b0g12ga82bcv******** created_at: "2023-03-13T16:23:12Z" network_id: enpabce123hd******** zone_id: ru-central1-a v4_cidr_blocks: - 192.168.1.0/24
1. Create a network using the Create method for the Networks resource.
2. Create a subnet in the ru-central1-a availability zone using the Create method for the Subnets resource.

Create an instance group from a Container Optimized Image with multiple Docker containers

Find out the ID of the latest version of the public Container Optimized Image.

A Container Optimized Image in a Container Registry registry may be updated and changed with new releases. This will not automatically update the VM image to the latest version. To create an instance group with the latest Container Optimized Image version, you need to check whether it is available yourself:
CLI

Yandex Cloud Marketplace
```
yc compute image get-latest-from-family container-optimized-image --folder-id standard-images
```
Result:
```
id: <ID_of_latest_COI_version>
folder_id: standard-images
...
```
1. Go to the Cloud Marketplace page and select the image with the configuration you need:
  - Container Optimized Image.
  - Container Optimized Image GPU.
2. Under Product IDs, copy the value of image_id.

Save the specification of the instance group with Container Optimized Image and multiple Docker containers to the specification.yaml file:

name: group-coi-containers # VM group name, unique within the folder.
service_account_id: ajeabccde01d******** # Service account ID.
instance_template:
  service_account_id: ajeabccde01d******** # ID of the service account to access private Docker images.
  platform_id: standard-v3 # Platform ID.
  resources_spec:
    memory: 2G # Amount of memory (RAM).
    cores: 2 # Number of processor cores (vCPUs).
  boot_disk_spec:
    mode: READ_WRITE # Disk access mode (read and write).
    disk_spec:
      image_id: <latest_COI_version_ID>
      type_id: network-hdd # Disk type.
      size: 32G # Disk size. It must be at least 30 GB.
  network_interface_specs:
   - network_id: enpabce123hd******** # Network ID.
     subnet_ids:
       - e1lnabc23r1c******** # Subnet ID.
     primary_v4_address_spec: {
       one_to_one_nat_spec: {
         ip_version: IPV4 # IPv4 specification for public access to the VM.
       }
     }
  metadata: # Values to send to the VM metadata.
   docker-compose: |- # Key in the VM metadata that is used with the Docker Compose specification.
     version: '3.7'
     services:
       app1:
         container_name: nginx
         image: "nginx"
         ports:
           - "80:80"
         restart: always
       app2:
         container_name: redis
         image: "redis"
         restart: always
   ssh-keys: | # Parameter for providing an SSH key to the VM.
     yc-user:ssh-ed25519 ABC...d01 user@desktop.ru # Username for connecting to the VM.
deploy_policy: # Deployment policy for VM instances in the group.
  max_unavailable: 1
  max_expansion: 0
scale_policy: # Scaling policy for VM instances in the group.
  fixed_scale:
    size: 2
allocation_policy: # Allocation policy of VM instances across availability zones.
  zones:
    - zone_id: ru-central1-a

Note

You can provide an SSH key in the VM metadata using the ssh-keys parameter or in the user-data string with the user metadata. This tutorial uses the first option.

Create an instance group named group-coi-containers using the specification.yaml specification:

CLI

API

Run this command:

yc compute instance-group create --file=specification.yaml

Result:

done (48s)
id: cl0q12abcd4e********
folder_id: b0g12ga82bcv********
...
  target_size: "2"
service_account_id: ajeabccde01d********
status: ACTIVE

Use the CreateFromYaml method for the InstanceGroup resource.

Make sure the instance group from the Container Optimized Image and with multiple Docker containers was created:

Management console

CLI

API

In the management console, select the folder where you created the instance group.
Select Compute Cloud.
Go to Instance groups.
Click the group-coi-containers instance group name.

yc compute instance-group list-instances group-coi-containers

Result:

+----------------------+---------------------------+----------------------------------+-------------+------------------------+----------------+
|     INSTANCE ID      |           NAME            |            EXTERNAL IP           | INTERNAL IP |         STATUS         | STATUS MESSAGE |
+----------------------+---------------------------+----------------------------------+-------------+------------------------+----------------+
| fhmabcv0de12******** | cl0q12abcs4g********-fmar | 84.201.155.117                   | 10.130.0.14 | RUNNING_ACTUAL [2h35m] |                |
| fhmab0cdqj12******** | cl0q12abcs4g********-fqeg | 84.252.131.221                   | 10.130.0.47 | RUNNING_ACTUAL [2h35m] |                |
+----------------------+---------------------------+----------------------------------+-------------+------------------------+----------------+

View the list of created VM instances using the List method for the InstanceGroup resource.

Test the instance group based on the Container Optimized Image with multiple Docker containers

Connect to one of the instances via SSH:

CLI

ssh yc-user@84.201.155.117

Result:

Welcome to Ubuntu 20.04.1 LTS (GNU/Linux 5.4.0-54-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage
Last login: Mon Mar 13 15:23:28 2023 from 123.456.789.101

View a list of Docker containers running on the VM:

CLI

sudo docker ps -a

Result:

CONTAINER ID  IMAGE  COMMAND                 CREATED             STATUS             PORTS               NAMES
c0a125a1765a  redis  "docker-entrypoint.s…"  About a minute ago  Up About a minute  6379/tcp            redis
01288d7e382f  nginx  "/docker-entrypoint.…"  About a minute ago  Up About a minute  0.0.0.0:80->80/tcp  nginx

Creating an instance group from a Container Optimized Image with multiple Docker containers

Getting startedGetting started

Prepare the environmentPrepare the environment

Create an instance group from a Container Optimized Image with multiple Docker containersCreate an instance group from a Container Optimized Image with multiple Docker containers

Test the instance group based on the Container Optimized Image with multiple Docker containersTest the instance group based on the Container Optimized Image with multiple Docker containers

Was the article helpful?

Getting started

Prepare the environment

Create an instance group from a Container Optimized Image with multiple Docker containers

Test the instance group based on the Container Optimized Image with multiple Docker containers