Kubernetes / 云原生

二进制部署一套高可用K8s集群-1.25+（六）

浅时光博客 · 4月25日 · 2022年 14.5w 次已读

九、部署containerd

部署containerd请参考下面本博客之前写的文章，这里就不再重复描述部署流程了！

在K8s集群中部署容器运行时：Containerd的部署与配置
2021-5-10 0

十、部署 kubelet 组件

1、创建 kubelet bootstrap kubeconfig 文件

Bootstrappong：为Node节点自动颁发证书，也就是给kubelet颁发所使用的证书；由于K8S主节点一般为固定的，而Node节点会做增加、删除或者故障恢复等操作需要证书，而kubelet证书是与主机名进行绑定的，如果手动管理证书会十分麻烦

1.1：创建文件

[root@k8s-master1 ~]# cd /opt/k8s/work
[root@k8s-master1 work]# for node_name in ${NODE_NAMES[@]}
  do
    echo ">>> ${node_name}"

    # 创建 token
    export BOOTSTRAP_TOKEN=$(kubeadm token create \
      --description kubelet-bootstrap-token \
      --groups system:bootstrappers:${node_name} \
      --kubeconfig ~/.kube/config)

    # 设置集群参数
    kubectl config set-cluster kubernetes \
      --certificate-authority=/etc/kubernetes/cert/ca.pem \
      --embed-certs=true \
      --server=${KUBE_APISERVER} \
      --kubeconfig=kubelet-bootstrap-${node_name}.kubeconfig

    # 设置客户端认证参数
    kubectl config set-credentials kubelet-bootstrap \
      --token=${BOOTSTRAP_TOKEN} \
      --kubeconfig=kubelet-bootstrap-${node_name}.kubeconfig

    # 设置上下文参数
    kubectl config set-context default \
      --cluster=kubernetes \
      --user=kubelet-bootstrap \
      --kubeconfig=kubelet-bootstrap-${node_name}.kubeconfig

    # 设置默认上下文
    kubectl config use-context default --kubeconfig=kubelet-bootstrap-${node_name}.kubeconfig
  done

1.2：查看 kubeadm 为各节点创建的 token

[root@k8s-master1 work]# kubeadm token list --kubeconfig ~/.kube/config

1.3：查看各 token 关联的 Secret

[root@k8s-master1 work]# kubectl get secrets  -n kube-system|grep bootstrap-token

2、分发 bootstrap kubeconfig 文件到所有节点

[root@k8s-master1 work]# for node_name in ${NODE_NAMES[@]}
  do
    echo ">>> ${node_name}"
    scp kubelet-bootstrap-${node_name}.kubeconfig root@${node_name}:/etc/kubernetes/kubelet-bootstrap.kubeconfig
  done

3、创建和分发 kubelet 参数配置文件

3.1：创建 kubelet 参数配置模板文件

[root@k8s-master1 work]# cat > kubelet-config.yaml.template <<EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: "##NODE_IP##"
staticPodPath: ""
syncFrequency: 1m
fileCheckFrequency: 20s
httpCheckFrequency: 20s
staticPodURL: ""
port: 10250
readOnlyPort: 0
rotateCertificates: true
serverTLSBootstrap: true
authentication:
  anonymous:
    enabled: false
  webhook:
    enabled: true
  x509:
    clientCAFile: "/etc/kubernetes/cert/ca.pem"
authorization:
  mode: Webhook
registryPullQPS: 0
registryBurst: 20
eventRecordQPS: 0
eventBurst: 20
enableDebuggingHandlers: true
enableContentionProfiling: true
healthzPort: 10248
healthzBindAddress: "##NODE_IP##"
clusterDomain: "${CLUSTER_DNS_DOMAIN}"
clusterDNS:
  - "${CLUSTER_DNS_SVC_IP}"
nodeStatusUpdateFrequency: 10s
nodeStatusReportFrequency: 1m
imageMinimumGCAge: 2m
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
volumeStatsAggPeriod: 1m
kubeletCgroups: ""
systemCgroups: ""
cgroupRoot: ""
cgroupsPerQOS: true
cgroupDriver: cgroupfs
runtimeRequestTimeout: 10m
hairpinMode: promiscuous-bridge
maxPods: 220
podCIDR: "${CLUSTER_CIDR}"
podPidsLimit: -1
resolvConf: /etc/resolv.conf
maxOpenFiles: 1000000
kubeAPIQPS: 1000
kubeAPIBurst: 2000
serializeImagePulls: false
evictionHard:
  memory.available:  "100Mi"
  nodefs.available:  "10%"
  nodefs.inodesFree: "5%"
  imagefs.available: "15%"
evictionSoft: {}
enableControllerAttachDetach: true
failSwapOn: true
containerLogMaxSize: 20Mi
containerLogMaxFiles: 10
systemReserved: {}
kubeReserved: {}
systemReservedCgroup: ""
kubeReservedCgroup: ""
enforceNodeAllocatable: ["pods"]
EOF

3.2：为各节点创建和分发 kubelet 配置文件

[root@k8s-master1 work]# for node_ip in ${NODE_IPS[@]}
  do 
    echo ">>> ${node_ip}"
    sed -e "s/##NODE_IP##/${node_ip}/" kubelet-config.yaml.template > kubelet-config-${node_ip}.yaml.template
    scp kubelet-config-${node_ip}.yaml.template root@${node_ip}:/etc/kubernetes/kubelet-config.yaml
  done

4、创建和分发 kubelet systemd unit 文件

4.1：创建 kubelet systemd unit 文件模板

[root@k8s-master1 work]# cat > kubelet.service.template <<EOF
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=containerd.service
Requires=containerd.service

[Service]
WorkingDirectory=${K8S_DIR}/kubelet
ExecStart=/opt/k8s/bin/kubelet \\
  --bootstrap-kubeconfig=/etc/kubernetes/kubelet-bootstrap.kubeconfig \\
  --cert-dir=/etc/kubernetes/cert \\
  --container-runtime-endpoint=unix:///run/containerd/containerd.sock \\
  --root-dir=${K8S_DIR}/kubelet \\
  --kubeconfig=/etc/kubernetes/kubelet.kubeconfig \\
  --config=/etc/kubernetes/kubelet-config.yaml \\
  --hostname-override=##NODE_NAME## \\
  --authentication-token-webhook=true \\
  --authorization-mode=Webhook \\
  --cgroup-driver=systemd \\
  --v=2
Restart=always
RestartSec=5
StartLimitInterval=0

[Install]
WantedBy=multi-user.target
EOF

注意：以下参数在K8s 1.24版本中已经跟随dockershim一起删除了；如果你部署的是K8s 1.24版本，那么下面的这几个参数直接从kubelet的启动配置文件中删除即可！！！

  • --network-plugin（已弃用：将与 dockershim 一起删除。）
  • --cni-conf-dir 默认值：/etc/cni/net.d（已弃用：将与 dockershim 一起删除。）
  • --image-pull-progress-deadline 持续时间 默认值：1m0s（已弃用：将与 dockershim 一起删除。）
  • --container-runtime=remote（已弃用）

4.2：为各节点创建和分发 kubelet systemd unit 文件

[root@k8s-master1 work]# for node_name in ${NODE_NAMES[@]}
  do 
    echo ">>> ${node_name}"
    sed -e "s/##NODE_NAME##/${node_name}/" kubelet.service.template > kubelet-${node_name}.service
    scp kubelet-${node_name}.service root@${node_name}:/etc/systemd/system/kubelet.service
  done

5、授予 kube-apiserver 访问 kubelet API 的权限

[root@k8s-master1 work]# kubectl create clusterrolebinding kube-apiserver:kubelet-apis --clusterrole=system:kubelet-api-admin --user kubernetes-master

6、Bootstrap Token Auth 和授予权限

[root@k8s-master1 work]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --group=system:bootstrappers

7、自动 approve CSR 请求，生成 kubelet client 证书

[root@k8s-master1 ~]# cd /opt/k8s/work
[root@k8s-master1 work]# cat > csr-crb.yaml <<EOF
 # Approve all CSRs for the group "system:bootstrappers"
 kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: auto-approve-csrs-for-group
 subjects:
 - kind: Group
   name: system:bootstrappers
   apiGroup: rbac.authorization.k8s.io
 roleRef:
   kind: ClusterRole
   name: system:certificates.k8s.io:certificatesigningrequests:nodeclient
   apiGroup: rbac.authorization.k8s.io
---
 # To let a node of the group "system:nodes" renew its own credentials
 kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: node-client-cert-renewal
 subjects:
 - kind: Group
   name: system:nodes
   apiGroup: rbac.authorization.k8s.io
 roleRef:
   kind: ClusterRole
   name: system:certificates.k8s.io:certificatesigningrequests:selfnodeclient
   apiGroup: rbac.authorization.k8s.io
---
# A ClusterRole which instructs the CSR approver to approve a node requesting a
# serving cert matching its client cert.
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: approve-node-server-renewal-csr
rules:
- apiGroups: ["certificates.k8s.io"]
  resources: ["certificatesigningrequests/selfnodeserver"]
  verbs: ["create"]
---
 # To let a node of the group "system:nodes" renew its own server credentials
 kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: node-server-cert-renewal
 subjects:
 - kind: Group
   name: system:nodes
   apiGroup: rbac.authorization.k8s.io
 roleRef:
   kind: ClusterRole
   name: approve-node-server-renewal-csr
   apiGroup: rbac.authorization.k8s.io
EOF

[root@k8s-master1 work]# kubectl apply -f csr-crb.yaml

8、启动 kubelet 服务

[root@k8s-master1 work]# for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "mkdir -p ${K8S_DIR}/kubelet/kubelet-plugins/volume/exec/"
    ssh root@${node_ip} "/usr/sbin/swapoff -a"
    ssh root@${node_ip} "systemctl daemon-reload && systemctl enable kubelet && systemctl restart kubelet"
  done

十一、部署 kube-proxy 组件

1、创建 kube-proxy 证书

1.1：创建证书签名请求

[root@k8s-master1 ~]# cd /opt/k8s/work
[root@k8s-master1 work]# cat > kube-proxy-csr.json <<EOF
{
  "CN": "system:kube-proxy",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "ShangHai",
      "L": "ShangHai",
      "O": "k8s",
      "OU": "dqz"
    }
  ]
}
EOF

1.2：生成证书和私钥

[root@k8s-master1 ~]# cd /opt/k8s/work
[root@k8s-master1 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem \
  -ca-key=/opt/k8s/work/ca-key.pem \
  -config=/opt/k8s/work/ca-config.json \
  -profile=kubernetes  kube-proxy-csr.json | cfssljson -bare kube-proxy

[root@k8s-master1 work]# ls kube-proxy*
kube-proxy.csr  kube-proxy-csr.json  kube-proxy-key.pem  kube-proxy.pem

2、创建和分发 kubeconfig 文件

2.1：创建kubeconfig文件

[root@k8s-master1 work]# kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/k8s/work/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-proxy.kubeconfig

[root@k8s-master1 work]# kubectl config set-credentials kube-proxy \
  --client-certificate=kube-proxy.pem \
  --client-key=kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig

[root@k8s-master1 work]# kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-proxy \
  --kubeconfig=kube-proxy.kubeconfig

[root@k8s-master1 work]# kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

2.2：分发kubeconfig文件

[root@k8s-master1 work]# for node_name in ${NODE_NAMES[@]}
  do
    echo ">>> ${node_name}"
    scp kube-proxy.kubeconfig root@${node_name}:/etc/kubernetes/
  done

3、创建 kube-proxy 配置文件

3.1：创建 kube-proxy config 文件模板

[root@k8s-master1 work]# cat > kube-proxy-config.yaml.template <<EOF
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
clientConnection:
  burst: 200
  kubeconfig: "/etc/kubernetes/kube-proxy.kubeconfig"
  qps: 100
bindAddress: ##NODE_IP##
healthzBindAddress: ##NODE_IP##:10256
metricsBindAddress: ##NODE_IP##:10249
enableProfiling: true
clusterCIDR: ${CLUSTER_CIDR}
hostnameOverride: ##NODE_NAME##
mode: "ipvs"
portRange: ""
iptables:
  masqueradeAll: false
ipvs:
  scheduler: rr
  excludeCIDRs: []
EOF

3.2：为集群所有节点创建和分发 kube-proxy 配置文件

[root@k8s-master1 work]# for (( i=0; i < 6; i++ ))
  do 
    echo ">>> ${NODE_NAMES[i]}"
    sed -e "s/##NODE_NAME##/${NODE_NAMES[i]}/" -e "s/##NODE_IP##/${NODE_IPS[i]}/" kube-proxy-config.yaml.template > kube-proxy-config-${NODE_NAMES[i]}.yaml.template
    scp kube-proxy-config-${NODE_NAMES[i]}.yaml.template root@${NODE_NAMES[i]}:/etc/kubernetes/kube-proxy-config.yaml
  done

4、创建和分发 kube-proxy sy原文链接：https://dqzboy.comstemd unit 文件

4.1：创建文件

[root@k8s-master1 ~]# cd /opt/k8s/work
[root@k8s-master1 work]# cat > kube-proxy.service <<EOF
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target

[Service]
WorkingDirectory=${K8S_DIR}/kube-proxy
ExecStart=/opt/k8s/bin/kube-proxy \\
  --config=/etc/kubernetes/kube-proxy-config.yaml \\
  --logtostderr=true \\
  --v=4
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

4.2：分发文件

[root@k8s-master1 work]# for node_name in ${NODE_NAMES[@]}
  do 
    echo ">>> ${node_name}"
    scp kube-proxy.service root@${node_name}:/etc/systemd/system/
  done

5、启动kube-proxy服务

[root@k8s-master1 work]# for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "mkdir -p ${K8S_DIR}/kube-proxy"
    ssh root@${node_ip} "modprobe ip_vs_rr"
    ssh root@${node_ip} "systemctl daemon-reload && systemctl enable kube-proxy && systemctl restart kube-proxy"
  done

6、检查启动结果

[root@k8s-master1 work]# for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "systemctl status kube-proxy|grep Active"
  done

7、查看 ipvs 路由规则

[root@k8s-master1 work]# for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "/usr/sbin/ipvsadm -ln"
  done

>>> 192.168.66.62
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.254.0.1:443 rr
  -> 192.168.66.62:6443           Masq    1      0          0         
  -> 192.168.66.63:6443           Masq    1      0          0         
  -> 192.168.66.64:6443           Masq    1      0          0         
>>> 192.168.66.63
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.254.0.1:443 rr
  -> 192.168.66.62:6443           Masq    1      0          0         
  -> 192.168.66.63:6443           Masq    1      0          0         
  -> 192.168.66.64:6443           Masq    1      0          0         
>>> 192.168.66.64
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.254.0.1:443 rr
  -> 192.168.66.62:6443           Masq    1      0          0         
  -> 192.168.66.63:6443           Masq    1      0          0         
  -> 192.168.66.64:6443           Masq    1      0          0  
>>> 192.168.66.65
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.254.0.1:443 rr
  -> 192.168.66.62:6443           Masq    1      0          0         
  -> 192.168.66.63:6443           Masq    1      0          0         
  -> 192.168.66.64:6443           Masq    1      0          0         
>>> 192.168.66.66
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.254.0.1:443 rr
  -> 192.168.66.62:6443           Masq    1      0          0         
  -> 192.168.66.63:6443           Masq    1      0          0         
  -> 192.168.66.64:6443           Masq    1      0          0         
>>> 192.168.66.67
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.254.0.1:443 rr
  -> 192.168.66.62:6443           Masq    1      0          0         
  -> 192.168.66.63:6443           Masq    1      0          0         
  -> 192.168.66.64:6443           Masq    1      0          0

十二、部署 Calico 网络

请参考本博客下面文章中的第6节内容，进行部署Calico网络插件

二进制部署多Master高可用K8S集群-v1.18（三）
2020-7-26 2
文章来源(Source)：浅时光博客

十三、部署集群插件

请参考本博客下面文章中的内容，进行部署集群插件

二进制部署多Master高可用K8S集群-v1.18（五）
2020-7-26 0

十四、检查K8s集群状态

[root@k8s-master1 work]# kubectl get nodes

本文作者：浅时光博客
原文链接：https://www.dqzboy.com/9748.html
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  1. 遇见_730上海2024-4-7 · 17:28

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  3. tinyhan吉林·长春2024-1-29 · 14:44

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