How do I set up the INTERNAL LoadBalancer?

Attach the following annotation to the service:

yandex.cpi.flant.com/listener-subnet-id: SubnetID

The annotation links the LoadBalancer with the appropriate Subnet.

How to reserve a public IP address?

This on is used in externalIPAddresses and natInstanceExternalAddress. It also can be used for a bastion host.

$ yc vpc address create --external-ipv4 zone=ru-central1-a
id: e9b4cfmmnc1mhgij75n7
folder_id: b1gog0h9k05lhqe5d88l
created_at: "2020-09-01T09:29:33Z"
external_ipv4_address:
  address: 178.154.226.159
  zone_id: ru-central1-a
  requirements: {}
reserved: true

Using DNS servers that differ from those provided by Yandex Cloud in the DHCP settings is a temporary solution. It will be abandoned after Yandex Cloud will introduce the Managed DNS service. To get around the restrictions described below, we recommend using stubZones from the kube-dns module.

Editing parameters

Pay attention to the following nuances:

  1. When changing parameters, you need to invoke netplan apply or a similar command that forces the update of the DHCP lease.
  2. You will need to restart all hostNetwork Pods (especially kube-dns) for the new resolv.conf settings to take effect.

Aspects of the use

If the dhcpOptions parameter is set, all DNS are routed to the DNS servers specified. These DNS servers must serve DNS requests to the Internet and (if needed) resolve intranet resources.

Do not use this option if the recursive DNSs specified cannot resolve the same list of zones that the recursive DNSs in the Yandex Cloud subnet can resolve.

How to set a custom StorageClass as default?

Specify the StorageClass name in the defaultClusterStorageClass parameter in the global module settings. Note that after doing so, the storageclass.kubernetes.io/is-default-class='true' annotation will be removed from the StorageClass that was previously set as the default one.

kubectl edit mc global

Adding CloudStatic nodes to a cluster

For VMs that you want to add to the cluster as nodes, add the node-network-cidr key to the metadata (Edit VM -> Metadata) with a value equal to the cluster’s nodeNetworkCIDR.

You can find out the nodeNetworkCIDR of the cluster using the command below:

kubectl -n kube-system get secret d8-provider-cluster-configuration -o json | jq --raw-output '.data."cloud-provider-cluster-configuration.yaml"' | base64 -d | grep '^nodeNetworkCIDR'

How do I create a cluster in a new VPC and set up bastion host to access the nodes?

  1. Bootstrap the base-infrastructure of the cluster:

    dhctl bootstrap-phase base-infra --config config.yml

  2. Create a bastion host:

    yc compute instance create \
--name bastion \
--hostname bastion \
--create-boot-disk image-family=ubuntu-2204-lts,image-folder-id=standard-images,size=20,type=network-hdd \
--memory 2 \
--cores 2 \
--core-fraction 100 \
--ssh-key ~/.ssh/id_rsa.pub \
--zone ru-central1-a \
--public-address 178.154.226.159

  3. Continue installing the cluster by specifying the bastion host data. Answer y to the question about the Terraform cache:

    dhctl bootstrap --ssh-bastion-host=178.154.226.159 --ssh-bastion-user=yc-user \
--ssh-user=ubuntu --ssh-agent-private-keys=/tmp/.ssh/id_rsa --config=/config.yml