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Arquitetura de vários clusters

Clusters GKE

O Kubernetes não é específico do fornecedor; no entanto, com o objetivo de fornecer instruções explícitas e completas para a implantação de todos os elementos de uma implementação de vários clusters do Kubernetes Operator, esta seção orienta você pelo processo de implantação de vários clusters do Kubernetes no GCP especificamente.

Pré-requisitos

Antes de começar, execute as seguintes ações:

1# GCP project name - this is the only parameter that is mandatory to change here
2export MDB_GKE_PROJECT="${MDB_GKE_PROJECT:="### Set your GKE project name here ###"}"
3
4# Adjust the values for each Kubernetes cluster in your deployment.
5# The deployment script references the following variables to get values for each cluster.
6export K8S_CLUSTER_0="k8s-mdb-0${K8S_CLUSTER_SUFFIX:-""}"
7export K8S_CLUSTER_0_ZONE="europe-central2-a"
8export K8S_CLUSTER_0_NUMBER_OF_NODES=3
9export K8S_CLUSTER_0_MACHINE_TYPE="e2-standard-4"
10export K8S_CLUSTER_0_CONTEXT_NAME="gke_${MDB_GKE_PROJECT}_${K8S_CLUSTER_0_ZONE}_${K8S_CLUSTER_0}"
11
12export K8S_CLUSTER_1="k8s-mdb-1${K8S_CLUSTER_SUFFIX:-""}"
13export K8S_CLUSTER_1_ZONE="europe-central2-b"
14export K8S_CLUSTER_1_NUMBER_OF_NODES=3
15export K8S_CLUSTER_1_MACHINE_TYPE="e2-standard-4"
16export K8S_CLUSTER_1_CONTEXT_NAME="gke_${MDB_GKE_PROJECT}_${K8S_CLUSTER_1_ZONE}_${K8S_CLUSTER_1}"
17
18export K8S_CLUSTER_2="k8s-mdb-2${K8S_CLUSTER_SUFFIX:-""}"
19export K8S_CLUSTER_2_ZONE="europe-central2-c"
20export K8S_CLUSTER_2_NUMBER_OF_NODES=1
21export K8S_CLUSTER_2_MACHINE_TYPE="e2-standard-4"
22export K8S_CLUSTER_2_CONTEXT_NAME="gke_${MDB_GKE_PROJECT}_${K8S_CLUSTER_2_ZONE}_${K8S_CLUSTER_2}"
23
24# Comment out the following line so that the script does not create preemptible nodes.
25# DO NOT USE preemptible nodes in production.
26export GKE_SPOT_INSTANCES_SWITCH="--preemptible"

código fonte

Você pode encontrar todo o código-fonte incluído no repositório do MongoDB Kubernetes Operator.

Procedimento

1

Defina seu projeto gcloud padrão :

1gcloud config set project "${MDB_GKE_PROJECT}"
2

Criar clusters Kubernetes.

Criar três GKE (Google Kubernetes Engine) clusters:

1gcloud container clusters create "${K8S_CLUSTER_0}" \
2      --zone="${K8S_CLUSTER_0_ZONE}" \
3      --num-nodes="${K8S_CLUSTER_0_NUMBER_OF_NODES}" \
4      --machine-type "${K8S_CLUSTER_0_MACHINE_TYPE}" \
5      --tags=mongodb \
6      "${GKE_SPOT_INSTANCES_SWITCH:-""}"
1gcloud container clusters create "${K8S_CLUSTER_1}" \
2      --zone="${K8S_CLUSTER_1_ZONE}" \
3      --num-nodes="${K8S_CLUSTER_1_NUMBER_OF_NODES}" \
4      --machine-type "${K8S_CLUSTER_1_MACHINE_TYPE}" \
5      --tags=mongodb \
6      "${GKE_SPOT_INSTANCES_SWITCH:-""}"
1gcloud container clusters create "${K8S_CLUSTER_2}" \
2      --zone="${K8S_CLUSTER_2_ZONE}" \
3      --num-nodes="${K8S_CLUSTER_2_NUMBER_OF_NODES}" \
4      --machine-type "${K8S_CLUSTER_2_MACHINE_TYPE}" \
5      --tags=mongodb \
6      "${GKE_SPOT_INSTANCES_SWITCH:-""}"
3

Armazene credenciais em seu kubeconfig.

Obtenha credenciais e salve contextos no arquivo kubeconfig atual. Por padrão, este arquivo está localizado no diretório ~/.kube/config e referenciado pela $KUBECONFIG variável de ambiente.

1gcloud container clusters get-credentials "${K8S_CLUSTER_0}" --zone="${K8S_CLUSTER_0_ZONE}"
2gcloud container clusters get-credentials "${K8S_CLUSTER_1}" --zone="${K8S_CLUSTER_1_ZONE}"
3gcloud container clusters get-credentials "${K8S_CLUSTER_2}" --zone="${K8S_CLUSTER_2_ZONE}"

Todos os comandos kubectl referenciam estes contextos utilizando as seguintes variáveis:

  • $K8S_CLUSTER_0_CONTEXT_NAME

  • $K8S_CLUSTER_1_CONTEXT_NAME

  • $K8S_CLUSTER_2_CONTEXT_NAME

4

Verifique se kubectl tem acesso aos clusters Kubernetes.

1echo "Nodes in cluster ${K8S_CLUSTER_0_CONTEXT_NAME}"
2kubectl --context "${K8S_CLUSTER_0_CONTEXT_NAME}" get nodes
3echo; echo "Nodes in cluster ${K8S_CLUSTER_1_CONTEXT_NAME}"
4kubectl --context "${K8S_CLUSTER_1_CONTEXT_NAME}" get nodes
5echo; echo "Nodes in cluster ${K8S_CLUSTER_2_CONTEXT_NAME}"
6kubectl --context "${K8S_CLUSTER_2_CONTEXT_NAME}" get nodes
1Nodes in cluster gke_scratch-kubernetes-team_europe-central2-a_k8s-mdb-0-682f2df6e1745e000788a1d5-19985
2NAME                                                  STATUS   ROLES    AGE     VERSION
3gke-k8s-mdb-0-682f2df6e1-default-pool-68d97b7f-fct9   Ready    <none>   2m20s   v1.32.3-gke.1785003
4gke-k8s-mdb-0-682f2df6e1-default-pool-68d97b7f-k9td   Ready    <none>   2m20s   v1.32.3-gke.1785003
5gke-k8s-mdb-0-682f2df6e1-default-pool-68d97b7f-pwsw   Ready    <none>   2m19s   v1.32.3-gke.1785003
6
7Nodes in cluster gke_scratch-kubernetes-team_europe-central2-b_k8s-mdb-1-682f2df6e1745e000788a1d5-19985
8NAME                                                  STATUS   ROLES    AGE   VERSION
9gke-k8s-mdb-1-682f2df6e1-default-pool-0f84fbc8-1b4j   Ready    <none>   32s   v1.32.3-gke.1785003
10gke-k8s-mdb-1-682f2df6e1-default-pool-0f84fbc8-fn7x   Ready    <none>   32s   v1.32.3-gke.1785003
11gke-k8s-mdb-1-682f2df6e1-default-pool-0f84fbc8-k4hc   Ready    <none>   32s   v1.32.3-gke.1785003
12
13Nodes in cluster gke_scratch-kubernetes-team_europe-central2-c_k8s-mdb-2-682f2df6e1745e000788a1d5-19985
14NAME                                                  STATUS   ROLES    AGE    VERSION
15gke-k8s-mdb-2-682f2df6e1-default-pool-ff13f41c-m4f9   Ready    <none>   4m6s   v1.32.3-gke.1785003

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