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Create a network from the Managed Kubernetes cluster to other Selectel services
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Create a network from the Managed Kubernetes cluster to other Selectel services

Create a network with a dedicated server

Use a Selectel global router to organize network connectivity between Managed Kubernetes clusters and a dedicated server.

  1. Create a global router.

  2. Connect network and subnets to global router to the cloud platform project that hosts the Managed Kubernetes cluster.

  3. Create cloud router. When creating, check the box Connect router to external network.

  4. Connect global router subnet to cloud router. When connecting, specify a cloud router IP address other than the global router IP address and the .253 and .254 service addresses.

  5. For the created global router subnet, see the allocated address pool (allocation_pool parameter in the command output):

    openstack subnet show <subnet_ID>

    Specify <subnet_ID> — the subnet ID of the global router, can be viewed with openstack subnet list.

  6. Exclude the IP address of the cloud router from the address pool. To do this, delete the address pool allocated to the global router subnet and add a new pool without the cloud router IP address:

    openstack subnet set --no-allocation-pool \
    --allocation-pool start=<first_pool_IP>, end=<last_pool_IP> \
    <subnet_ID>

    Specify:

    • <first_new_pool_IP> is the first IP address from the new pool;
    • <last_new_pool_IP> is the last IP address from the new pool;
    • multiple pools can be added, each pool is added using the option --allocation-pool start=<first_pool_IP>,end=<last_pool_IP>.
  7. Assign the IP address of the cloud router as the default gateway so that traffic is sent to the cloud router:

    openstack subnet set --gateway <cloud_router_IP> <subnet_ID>

    Specify <cloud_router_IP> — the IP address of the cloud router.

  8. Check that the gateway_ip parameter in the command output matches the IP address of the cloud router:

    openstack subnet show <subnet_ID>

    Note that in the Control Panel, under Network ServicesSelectel Global Router, the subnet will show the old gateway.

  9. To configure connectivity to a dedicated server, add static routes. To do so, create a ticket and specify in it:

    • Project ID — in control panel open the projects menu (name of the current project) and copy the project ID;
    • Global Router Subnet ID — In Control Panel go to Network ServicesSelectel Global Router. On the router page, expand the network block, find the desired subnet and and copy the value in the UUID column;
    • IP address selected as the subnet gateway on the global router — in control panel go to Network ServicesSelectel Global Router. On the router page, expand the network block, find the desired subnet and and copy the value in the Gateway column;
    • CIDR of a destination subnet with a dedicated server.
  10. Create Managed Kubernetes cluster. When creating, select the subnet of the global router in the Network block.

Create a network with a cloud server

In one project

  1. Create private network.
  2. Connect network to router.
  3. Create Cluster Managed Kubernetes and select the private network created in step 1 as the network.
  4. Merge to private network cloud servers.

Between projects

If the cloud servers and the cluster are in different projects, you need to make the private network of one project available to the other project — this is called cross-project networking.

  1. Create private network.
  2. Connect network to router.
  3. Create Cluster Managed Kubernetes and select the private network created in step 1 as the network.
  4. Make private network crossproject-network.
  5. In the target project merge to cross-project network cloud servers.

Create a network with cloud databases

Networking a Managed Kubernetes cluster and a cloud database cluster can be done in the same way as a cloud server — in the same project and between projects.