suse 12 二进制部署 Kubernetets 1.19.7 - 第08章 - 部署kube-scheduler组件

1.8、部署kube-scheduler

1.8.0、创建kube-scheduler请求证书

k8s-01:~ # cd /opt/k8s/ssl/
k8s-01:/opt/k8s/ssl # cat > kube-scheduler-csr.json <<EOF
{
    
    
    "CN": "system:kube-scheduler",
    "hosts": [
      "127.0.0.1",
      "192.168.72.39",
      "192.168.72.40",
      "192.168.72.41"
    ],
    "key": {
    
    
        "algo": "rsa",
        "size": 2048
    },
    "names": [
      {
    
    
        "C": "CN",
        "ST": "ShangHai",
        "L": "ShangHai",
        "O": "system:kube-scheduler",
        "OU": "bandian"
      }
    ]
}
EOF

1.8.1、生成kube-scheduler证书和私钥

k8s-01:/opt/k8s/ssl # cfssl gencert -ca=/opt/k8s/ssl/ca.pem \
-ca-key=/opt/k8s/ssl/ca-key.pem \
-config=/opt/k8s/ssl/ca-config.json \
-profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler

1.8.2、创建kube-scheduler的kubeconfig文件

k8s-01:/opt/k8s/ssl # source /opt/k8s/bin/k8s-env.sh

"设置集群参数"
k8s-01:/opt/k8s/ssl # kubectl config set-cluster kubernetes \
--certificate-authority=/opt/k8s/ssl/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kube-scheduler.kubeconfig

"设置客户端认证参数"
k8s-01:/opt/k8s/ssl # kubectl config set-credentials system:kube-scheduler \
--client-certificate=kube-scheduler.pem \
--client-key=kube-scheduler-key.pem \
--embed-certs=true \
--kubeconfig=kube-scheduler.kubeconfig

"设置上下文参数"
k8s-01:/opt/k8s/ssl # kubectl config set-context system:kube-scheduler \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=kube-scheduler.kubeconfig

"设置默认上下文"
k8s-01:/opt/k8s/ssl # kubectl config use-context system:kube-scheduler --kubeconfig=kube-scheduler.kubeconfig

1.8.3、配置kube-scheduler为systemctl启动

k8s-01:~ # cd /opt/k8s/conf/
k8s-01:/opt/k8s/conf # source /opt/k8s/bin/k8s-env.sh
k8s-01:/opt/k8s/conf # cat > kube-scheduler.service.template <<EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
WorkingDirectory=${K8S_DIR}/kube-scheduler
ExecStart=/opt/k8s/bin/kube-scheduler \\
  --bind-address=0.0.0.0 \\
  --leader-elect=true \\
  --kubeconfig=/etc/kubernetes/cert/kube-scheduler.kubeconfig \\
  --tls-cert-file=/etc/kubernetes/cert/kube-scheduler.pem \\
  --tls-private-key-file=/etc/kubernetes/cert/kube-scheduler-key.pem \\
  --authentication-kubeconfig=/etc/kubernetes/cert/kube-scheduler.kubeconfig \\
  --client-ca-file=/etc/kubernetes/cert/ca.pem \\
  --requestheader-allowed-names \\
  --requestheader-client-ca-file=/etc/kubernetes/cert/ca.pem \\
  --requestheader-extra-headers-prefix="X-Remote-Extra-" \\
  --requestheader-group-headers=X-Remote-Group \\
  --requestheader-username-headers=X-Remote-User \\
  --logtostderr=true \\
  --v=2
Restart=always
RestartSec=5
StartLimitInterval=0

[Install]
WantedBy=multi-user.target
EOF

1.8.4、分发kube-scheduler证书和文件到其他节点

#!/usr/bin/env bash
source /opt/k8s/bin/k8s-env.sh

for host in ${MASTER_IPS[@]}
do
    printf "\e[1;34m${host}\e[0m\n"
    scp /opt/k8s/conf/kube-scheduler.service.template ${host}:/etc/systemd/system/kube-scheduler.service
    scp /opt/k8s/ssl/{
    
    kube-scheduler*.pem,kube-scheduler.kubeconfig} ${host}:/etc/kubernetes/cert
done

1.8.5、启动kube-scheduler服务

#!/usr/bin/env bash
source /opt/k8s/bin/k8s-env.sh

for host in ${MASTER_IPS[@]}
do
    printf "\e[1;34m${host}\e[0m\n"
    ssh root@${host} "mkdir -p ${K8S_DIR}/kube-scheduler"
    ssh root@${host} "systemctl daemon-reload && \
                      systemctl enable kube-scheduler --now && \
                      systemctl status kube-scheduler | grep Active"
done

1.8.6、查看kube-scheduler端口

k8s-01:~ # ss -nltp | grep kube-scheduler
LISTEN     0      128         :::10251                   :::*                   users:(("kube-scheduler",pid=67502,fd=8))
LISTEN     0      128         :::10259                   :::*                   users:(("kube-scheduler",pid=67502,fd=9))

1.8.7、查看当前leader

k8s-01:~ # kubectl get endpoints kube-scheduler --namespace=kube-system  -o yaml
apiVersion: v1
kind: Endpoints
metadata:
  annotations:
    control-plane.alpha.kubernetes.io/leader: '{"holderIdentity":"k8s-01_556718e1-338e-4e87-b2c8-c1ea2ccfa1c1","leaseDurationSeconds":15,"acquireTime":"2021-02-12T16:54:38Z","renewTime":"2021-02-12T16:54:49Z","leaderTransitions":0}'
  creationTimestamp: "2021-02-12T16:54:39Z"
  managedFields:
  - apiVersion: v1
    fieldsType: FieldsV1
    fieldsV1:
      f:metadata:
        f:annotations:
          .: {
    
    }
          f:control-plane.alpha.kubernetes.io/leader: {
    
    }
    manager: kube-scheduler
    operation: Update
    time: "2021-02-12T16:54:39Z"
  name: kube-scheduler
  namespace: kube-system
  resourceVersion: "557"
  selfLink: /api/v1/namespaces/kube-system/endpoints/kube-scheduler
  uid: 1e33fe40-0d13-4407-a7bb-f7a37f4a72a8

• 到此，kubernetes master节点已经部署完成，后面开始kubernetes node节点的部署
• docker和flannel之前已经全节点部署了，因此，node节点只需要部署kubelet、kube-proxy、coredns以及dashboard