Como criar clusters de administrador em uma configuração de vários clusters

Em clusters do Anthos em bare metal, os clusters de usuário executam suas cargas de trabalho e, em uma arquitetura de vários clusters, os clusters de usuário são criados e gerenciados por um cluster de administrador.

Depois de criar um cluster de administrador, chamar o comando bmctl create config cria um arquivo yaml que pode ser editado para definir o cluster de usuário. Para aplicar a configuração e criar o cluster de usuário, use o comando bmctl create cluster. As verificações de simulação são aplicáveis aos clusters de usuários criados com o comando bmctl create cluster.

Manter as cargas de trabalho fora do cluster de administrador protege dados administrativos confidenciais, como chaves SSH armazenadas no cluster de administrador, contra aqueles que não precisam acessar essas informações. Além disso, manter os clusters de usuários separados uns dos outros oferece uma boa segurança geral para as cargas de trabalho.

Pré-requisitos

  • O último bmctl é transferido por download (gs://anthos-baremetal-release/bmctl/1.8.9/linux-amd64/bmctl) do Cloud Storage.
  • cluster de administrador de trabalho com acesso ao servidor da API do cluster (o controlPlaneVIP);
  • Os nós do cluster de administrador têm conectividade de rede para todos os nós no cluster do usuário de destino.
  • A estação de trabalho que executa bmctl tem conectividade de rede com todos os nós nos clusters de usuários de destino.
  • Chave SSH usada para criar o cluster de usuário disponível para o usuário raiz ou SUDO em todos os nós do cluster do usuário.
  • A conta de serviço de registro do Connect é configurada no cluster de administrador para uso com o Connect.

Ativar o SELinux

Se você quiser ativar o SELinux para proteger seus contêineres, verifique se o SELinux está ativado em máquinas host no modo Enforced antes de instalar os clusters do Anthos em Bare Metal. O SELinux está ativado por padrão nos sistemas RHEL e CentOS.Se o SELinux estiver desativado nos clusters ou você não tiver certeza, consulte Como proteger os contêineres usando o SELinux para instruções sobre como ativá-lo.

Os clusters do Anthos em bare metal são compatíveis com o SELinux apenas em sistemas RHEL e CentOS.

Criar um arquivo de configuração de cluster de usuário

O arquivo de configuração para criar um cluster de usuário é quase exatamente igual ao usado para criar um cluster de administrador. A única diferença é que você remove a seção de configuração de credenciais locais para fazer com que a configuração seja um conjunto válido de recursos do Kubernetes. A seção de configuração fica na parte superior do arquivo na seção bmctl configuration variables.

Por padrão, os clusters de usuário herdam as credenciais do cluster de administrador que as gerencia. É possível substituir parcialmente todas ou algumas dessas credenciais. Consulte o arquivo exemplo de configuração do cluster de usuário para mais detalhes.

  1. Crie um arquivo de configuração do cluster de usuário com o comando bmctl create config:

    criar config -bmctl c USER_CLUSTER_NAME

    Por exemplo, emita o seguinte comando para criar um arquivo de configuração para um cluster de usuário chamado user1:

    criar config -bmctl c

    O arquivo é gravado em bmctl-workspace/user1/user1.yaml. O caminho genérico para o arquivo é bmctl-workspace/CLUSTER NAME/CLUSTER_NAME.yaml

  2. Edite o arquivo de configuração com as seguintes alterações:

    • Remova os caminhos do arquivo das credenciais locais da configuração:

      ....
  gcrKeyPath: (path to GCR service account key)
  sshPrivateKeyPath: (path to SSH private key, used for node access)
  gkeConnectAgentServiceAccountKeyPath: (path to Connect agent service account key)
  gkeConnectRegisterServiceAccountKeyPath: (path to Hub registration service account key)
  cloudOperationsServiceAccountKeyPath: (path to Cloud Operations service account key)
....

    • Altere a configuração para especificar um tipo de cluster de user em vez de admin:

      ....
spec:
  # Cluster type. This can be:
  #   1) admin:  to create an admin cluster. This can later be used to create
  #   user clusters.
  #   2) user:   to create a user cluster. Requires an existing admin cluster.
  #   3) hybrid: to create a hybrid cluster that runs admin cluster
  #   components and user workloads.
  #   4) standalone: to create a cluster that manages itself, runs user
  #   workloads, but does not manage other clusters.
  type: user
....

    • Garanta que as especificações de cluster de administrador e de usuário para os VIPs do balanceador de carga e os pools de endereços sejam complementares e não sobreponham clusters atuais. Veja abaixo um exemplo de configuração de configurações de cluster de usuário e administrador, especificando o balanceamento de carga e os pools de endereços:

      ....
# Sample admin cluster config for load balancer and address pools
  loadBalancer:
    vips:
      controlPlaneVIP: 10.200.0.49
      ingressVIP: 10.200.0.50
    addressPools:
    - name: pool1
      addresses:
      - 10.200.0.50-10.200.0.70
....
....
# Sample user cluster config for load balancer and address pools
loadBalancer:
    vips:
      controlPlaneVIP: 10.200.0.71
      ingressVIP: 10.200.0.72
    addressPools:
    - name: pool1
      addresses:
      - 10.200.0.72-10.200.0.90
....

      Os outros arquivos de configuração do cluster do usuário são iguais aos da configuração do cluster do administrador.

    • Especifique a densidade do pod dos nós do cluster e o ambiente de execução do contêiner:

      ....
# NodeConfig specifies the configuration that applies to all nodes in the cluster.
nodeConfig:
  # podDensity specifies the pod density configuration.
  podDensity:
    # maxPodsPerNode specifies at most how many pods can be run on a single node.
    maxPodsPerNode: 110
  # containerRuntime specifies which container runtime to use for scheduling containers on nodes.
  # containerd and docker are supported.
  containerRuntime: containerd
....

      Para clusters de usuários, os valores permitidos para maxPodsPerNode são 32-250. Se não especificado, o valor padrão será 110. Depois que o cluster é criado, esse valor não pode ser atualizado.

      A densidade de pods também é limitada pelos recursos de IP disponíveis do cluster. Para detalhes, consulte Rede de pod.

Criar o cluster de usuário

Emita o comando bmctl para aplicar a configuração do cluster de usuário revisado e criar o cluster:

bmctl create cluster -c USER_CLUSTER_NAME --kubeconfig ADMIN_KUBECONFIG

Substitua:

  • USER_CLUSTER_NAME especifica o nome do cluster criado na seção anterior.
  • ADMIN_KUBECONFIG especifica o caminho até o arquivo kubeconfig do cluster de administrador;

Por exemplo, para um cluster de usuários chamado user1 e um arquivo kubeconfig do cluster de administrador com o caminho kubeconfig bmctl-workspace/admin/admin-kubeconfig, o comando seria:

bmctl create cluster -c user1 --kubeconfig bmctl-workspace/admin/admin-kubeconfig

Exemplo de configuração completa de cluster de usuário

A seguir, um exemplo de arquivo de configuração de cluster de administrador criado pelo comando bmctl. Observe que, nesta configuração de amostra, são usados nomes de cluster de marcador, VIPs e endereços. Eles podem não funcionar na sua rede. As credenciais serão herdadas do cluster de administrador por padrão. Se você quiser modificar as credenciais, forneça os caminhos de chave correspondentes na seção configuration variables.

# Sample user cluster config:

# ---
# To override default credentials
# gcrKeyPath: #/bmctl/bmctl-workspace/.sa-keys/my-gcp-project-anthos-baremetal-gcr.json
# sshPrivateKeyPath: /bmctl/bmctl-workspace/.ssh/id_rsa
# gkeConnectAgentServiceAccountKeyPath: #/bmctl/bmctl-workspace/.sa-keys/my-gcp-project-anthos-baremetal-connect.json
# gkeConnectRegisterServiceAccountKeyPath: #/bmctl/bmctl-workspace/.sa-keys/my-gcp-project-anthos-baremetal-register.json
# cloudOperationsServiceAccountKeyPath: #/bmctl/bmctl-workspace/.sa-keys/my-gcp-project-anthos-baremetal-cloud-ops.json
---
apiVersion: v1
kind: Namespace
metadata:
  name: cluster-user1
---
apiVersion: baremetal.cluster.gke.io/v1
kind: Cluster
metadata:
  name: user1
  namespace: cluster-user1
spec:
  # Cluster type. This can be:
  #   1) admin:  to create an admin cluster. This can later be used to create user clusters.
  #   2) user:   to create a user cluster. Requires an existing admin cluster.
  #   3) hybrid: to create a hybrid cluster that runs admin cluster components and user workloads.
  #   4) standalone: to create a cluster that manages itself, runs user workloads,
  #   but does not manage other clusters.
  type: user
  # Anthos cluster version.
  anthosBareMetalVersion: 1.8.9
  # GKE connect configuration
  gkeConnect:
    projectID: GOOGLE_PROJECT_ID
  # Control plane configuration
  controlPlane:
    nodePoolSpec:
      nodes:
      # Control plane node pools. Typically, this is either a single machine
      # or 3 machines if using a high availability deployment.
      - address: 10.200.0.4
  # Cluster networking configuration
  clusterNetwork:
    # Pods specify the IP ranges from which pod networks are allocated.
    pods:
      cidrBlocks:
      - 192.168.0.0/16
    # Services specify the network ranges from which service virtual IPs are allocated.
    # This can be any RFC 1918 range that does not conflict with any other IP range
    # in the cluster and node pool resources.
    services:
      cidrBlocks:
      - 10.96.0.0/20
  # Load balancer configuration
  loadBalancer:
    # Load balancer mode can be either 'bundled' or 'manual'.
    # In 'bundled' mode a load balancer will be installed on load balancer nodes during cluster creation.
    # In 'manual' mode the cluster relies on a manually-configured external load balancer.
    mode: bundled
    # Load balancer port configuration
    ports:
      # Specifies the port the load balancer serves the Kubernetes control plane on.
      # In 'manual' mode the external load balancer must be listening on this port.
      controlPlaneLBPort: 443
    # There are two load balancer virtual IP (VIP) addresses: one for the control plane
    # and one for the L7 Ingress service. The VIPs must be in the same subnet as the load balancer nodes.
    # These IP addresses do not correspond to physical network interfaces.
    vips:
      # ControlPlaneVIP specifies the VIP to connect to the Kubernetes API server.
      # This address must not be in the address pools below.
      controlPlaneVIP: 10.200.0.71
      # IngressVIP specifies the VIP shared by all services for ingress traffic.
      # Allowed only in non-admin clusters.
      # This address must be in the address pools below.
      ingressVIP: 10.200.0.72
    # AddressPools is a list of non-overlapping IP ranges for the data plane load balancer.
    # All addresses must be in the same subnet as the load balancer nodes.
    # Address pool configuration is only valid for 'bundled' LB mode in non-admin clusters.
    addressPools:
    - name: pool1
      addresses:
      # Each address must be either in the CIDR form (1.2.3.0/24)
      # or range form (1.2.3.1-1.2.3.5).
      - 10.200.0.72-10.200.0.90
    # A load balancer node pool can be configured to specify nodes used for load balancing.
    # These nodes are part of the Kubernetes cluster and run regular workloads as well as load balancers.
    # If the node pool config is absent then the control plane nodes are used.
    # Node pool configuration is only valid for 'bundled' LB mode.
    # nodePoolSpec:
    #  nodes:
    #  - address: <Machine 1 IP>
  # Proxy configuration
  # proxy:
  #   url: http://[username:password@]domain
  #   # A list of IPs, hostnames or domains that should not be proxied.
  #   noProxy:
  #   - 127.0.0.1
  #   - localhost
  # Logging and Monitoring
  clusterOperations:
    # Cloud project for logs and metrics.
    projectID: $GOOGLE_PROJECT_ID
    # Cloud location for logs and metrics.
    location: us-central1
    # Whether collection of application logs/metrics should be enabled (in addition to
    # collection of system logs/metrics which correspond to system components such as
    # Kubernetes control plane or cluster management agents).
    # enableApplication: false
  # Storage configuration
  storage:
    # lvpNodeMounts specifies the config for local PersistentVolumes backed by mounted disks.
    # These disks need to be formatted and mounted by the user, which can be done before or after
    # cluster creation.
    lvpNodeMounts:
      # path specifies the host machine path where mounted disks will be discovered and a local PV
      # will be created for each mount.
      path: /mnt/localpv-disk
      # storageClassName specifies the StorageClass that PVs will be created with. The StorageClass
      # is created during cluster creation.
      storageClassName: local-disks
    # lvpShare specifies the config for local PersistentVolumes backed by subdirectories in a shared filesystem.
    # These subdirectories are automatically created during cluster creation.
    lvpShare:
      # path specifies the host machine path where subdirectories will be created on each host. A local PV
      # will be created for each subdirectory.
      path: /mnt/localpv-share
      # storageClassName specifies the StorageClass that PVs will be created with. The StorageClass
      # is created during cluster creation.
      storageClassName: local-shared
      # numPVUnderSharedPath specifies the number of subdirectories to create under path.
      numPVUnderSharedPath: 5
  # NodeConfig specifies the configuration that applies to all nodes in the cluster.
  nodeConfig:
    # podDensity specifies the pod density configuration.
    podDensity:
      # maxPodsPerNode specifies at most how many pods can be run on a single node.
      maxPodsPerNode: 250
    # containerRuntime specifies which container runtime to use for scheduling containers on nodes.
    # containerd and docker are supported.
    containerRuntime: containerd
  # KubeVirt configuration, uncomment this section if you want to install kubevirt to the cluster
  # kubevirt:
  #   # if useEmulation is enabled, hardware accelerator (i.e relies on cpu feature like vmx or svm)
  #   # will not be attempted. QEMU will be used for software emulation.
  #   # useEmulation must be specified for KubeVirt installation
  #   useEmulation: false
  # Authentication; uncomment this section if you wish to enable authentication to the cluster with OpenID Connect.
  # authentication:
  #   oidc:
  #     # issuerURL specifies the URL of your OpenID provider, such as "https://accounts.google.com". The Kubernetes API
  #     # server uses this URL to discover public keys for verifying tokens. Must use HTTPS.
  #     issuerURL: <URL for OIDC Provider; required>
  #     # clientID specifies the ID for the client application that makes authentication requests to the OpenID
  #     # provider.
  #     clientID: <ID for OIDC client application; required>
  #     # clientSecret specifies the secret for the client application.
  #     clientSecret: <Secret for OIDC client application; optional>
  #     # kubectlRedirectURL specifies the redirect URL (required) for the gcloud CLI, such as
  #     # "http://localhost:[PORT]/callback".
  #     kubectlRedirectURL: <Redirect URL for the gcloud CLI; optional, default is "http://kubectl.redirect.invalid">
  #     # username specifies the JWT claim to use as the username. The default is "sub", which is expected to be a
  #     # unique identifier of the end user.
  #     username: <JWT claim to use as the username; optional, default is "sub">
  #     # usernamePrefix specifies the prefix prepended to username claims to prevent clashes with existing names.
  #     usernamePrefix: <Prefix prepended to username claims; optional>
  #     # group specifies the JWT claim that the provider will use to return your security groups.
  #     group: <JWT claim to use as the group name; optional>
  #     # groupPrefix specifies the prefix prepended to group claims to prevent clashes with existing names.
  #     groupPrefix: <Prefix prepended to group claims; optional>
  #     # scopes specifies additional scopes to send to the OpenID provider as a comma-delimited list.
  #     scopes: <Additional scopes to send to OIDC provider as a comma-separated list; optional>
  #     # extraParams specifies additional key-value parameters to send to the OpenID provider as a comma-delimited
  #     # list.
  #     extraParams: <Additional key-value parameters to send to OIDC provider as a comma-separated list; optional>
  #     # proxy specifies the proxy server to use for the cluster to connect to your OIDC provider, if applicable.
  #     # Example: https://user:password@10.10.10.10:8888. If left blank, this defaults to no proxy.
  #     proxy: <Proxy server to use for the cluster to connect to your OIDC provider; optional, default is no proxy>
  #     # deployCloudConsoleProxy specifies whether to deploy a reverse proxy in the cluster to allow Google Cloud
  #     # Console access to the on-premises OIDC provider for authenticating users. If your identity provider is not
  #     # reachable over the public internet, and you wish to authenticate using Google Cloud console, then this field
  #     # must be set to true. If left blank, this field defaults to false.
  #     deployCloudConsoleProxy: <Whether to deploy a reverse proxy for Google Cloud console authentication; optional>
  #     # certificateAuthorityData specifies a Base64 PEM-encoded certificate authority certificate of your identity
  #     # provider. It's not needed if your identity provider's certificate was issued by a well-known public CA.
  #     # However, if deployCloudConsoleProxy is true, then this value must be provided, even for a well-known public
  #     # CA.
  #     certificateAuthorityData: <Base64 PEM-encoded certificate authority certificate of your OIDC provider; optional>
  # Node access configuration; uncomment this section if you wish to use a non-root user
  # with passwordless sudo capability for machine login.
  # nodeAccess:
  #   loginUser: <login user name>
---
# Node pools for worker nodes
apiVersion: baremetal.cluster.gke.io/v1
kind: NodePool
metadata:
  name: node-pool-1
  namespace: cluster-user1
spec:
  clusterName: user1
  nodes:
  - address: 10.200.0.5