1、环境准备
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https://download.rockylinux.org/pub/rocky/8/isos/x86_64/Rocky-8.5-x86_64-dvd1.iso |
1.1、在centos8和现在刚出的RockyLinux里面通过 systemctl start network 已经不行了，提示找不到network，因为命令改变了，同样centos8上最小化安装ifconfig 这个命令也没了，不过ip a查看IP地址还可以的。
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通用的命令 ifdown ens33 关闭网卡名叫ens33的网卡 ifup ens33 开启网卡名叫ens33的网卡 1、重载网卡 ，重启网卡之前一定要重新载入一下配置文件，不然不能立即生效 nmcli connection reload nmcli c reload 2、开启网卡 nmcli c up ens33 3、关闭网卡 nmcli c down ens33 4、显示网卡的配置信息和运行状态 nmcli 5、查看网卡的状态 nmcli device status |
系统基础配置参考：传送门
1.2、允许 iptables 检查桥接流量
确保 br_netfilter 模块被加载。这一操作可以通过运行 lsmod | grep br_netfilter 来完成。若要显式加载该模块，可执行 sudo modprobe br_netfilter。
为了让你的 Linux 节点上的 iptables 能够正确地查看桥接流量，你需要确保在你的 sysctl 配置中将 net.bridge.bridge-nf-call-iptables 设置为 1。例如：
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cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf br_netfilter EOF cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF sudo sysctl --system |
1.3、节点规划
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192.168.66.220 k8s-master01 192.168.66.221 k8s-node1 192.168.66.222 k8s-node2 |
2.开始部署
2.1 部署 containerd 组件(所有node节点)
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https://github.com/containerd/containerd/releases/download/v1.5.8/cri-containerd-cni-1.5.8-linux-amd64.tar.gz |
2.1、解压并启动containerd
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tar -zxvf cri-containerd-cni-1.5.8-linux-amd64.tar.gz rm -rf etc/cni/net.d/10-containerd-net.conflist #此目录里的cni0配置文件需要删除,不然偶尔启动pod,可能分配错IP,K8S的默认别配置cni cp -rf etc/* /etc/ cp -rf opt/* /opt/ cp -rf usr/* /usr/ systemctl daemon-reload systemctl enable containerd systemctl start containerd systemctl status containerd |
2.2、对containerd进行初始化生成其配置文件
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#生成默认配置文件 containerd config default |
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vim /etc/containers/config.toml #修改pause容器的拉取地址 #修改SystemdCgroup = true |
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[plugins.opt] path = "/apps/containerd" [plugins.cri] stream_server_address = "127.0.0.1" stream_server_port = "10010" sandbox_image = "docker.io/juestnow/pause:3.5" max_concurrent_downloads = 20 [plugins.cri.containerd] default_runtime_name = "runc" disable_snapshot_annotations = true discard_unpacked_layers = false no_pivot = false snapshotter = "overlayfs" [plugins.cri.containerd.default_runtime] runtime_type = "" runtime_engine = "" runtime_root = "" [plugins.cri.containerd.untrusted_workload_runtime] runtime_type = "" runtime_engine = "" runtime_root = "" [plugins.cri.containerd.runtimes.runc] base_runtime_spec = "" container_annotations = [] pod_annotations = [] privileged_without_host_devices = false runtime_engine = "" runtime_root = "" runtime_type = "io.containerd.runc.v2" [plugins.cri.containerd.runtimes.runc.options] SystemdCgroup = true [plugins.cri.cni] bin_dir = "/opt/cni/bin" conf_dir = "/etc/cni/net.d" [plugins.cri.registry] [plugins.cri.registry.mirrors] [plugins.cri.registry.mirrors."docker.io"] endpoint = ["https://docker.mirrors.ustc.edu.cn","https://br6ai2ea.mirror.aliyuncs.com"] [plugins."io.containerd.runtime.v1.linux"] shim = "containerd-shim" runtime = "runc" runtime_root = "" no_shim = false shim_debug = false [plugins."io.containerd.runtime.v2.task"] platforms = ["linux/amd64"] |
2.3、containerd配置服务文件
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vim /etc/systemd/system/containerd.service |
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[Unit] Description=Lightweight Kubernetes Documentation=https://containerd.io After=network-online.target [Service] Type=notify Environment=PATH=/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/root/bin ExecStartPre=-/sbin/modprobe br_netfilter ExecStartPre=-/sbin/modprobe overlay ExecStartPre=-/bin/mkdir -p /run/containerd ExecStart=/usr/local/bin/containerd \ -c /etc/containers/config.toml \ -a /run/containerd/containerd.sock \ --state /run/containerd \ --root /var/lib/containerd KillMode=process Delegate=yes OOMScoreAdjust=-999 LimitNOFILE=65535 LimitNPROC=65535 LimitCORE=infinity TasksMax=infinity TimeoutStartSec=0 Restart=always RestartSec=5s [Install] WantedBy=multi-user.target |
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解析： #容器里面文件打开数 LimitNOFILE=65535 LimitNPROC=65535 #容器镜像存放目录 --root /var/lib/containerd |
2.4、 修改crictl地址和你的路径一致即可(crictl用来手动查看当前节点的容器)
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vim /etc/crictl.yaml |
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runtime-endpoint: unix:///run/containerd/containerd.sock image-endpoint: unix:///run/containerd/containerd.sock timeout: 10 debug: false |
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crictl相关命令： crictl info crictl ps crictl login --username=66wanggang66@gmail.com --password=@#688442 registry.cn-shanghai.aliyuncs.com |
2.5、重启 containerd 服务 配置完成
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systemctl daemon-reload systemctl restart containerd systemctl status containerd |
3、安装 Kubeadm
3.1、设置添加阿里YUM软件源(如已设置可忽略)
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cat > /etc/yum.repos.d/kubernetes.repo << EOF [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF |
3.2、安装各个工具
- kubeadm 初始化工具
- kubectl 命令行管理工具
- kubelet 跟dokcer交互创建容器
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yum install -y kubelet-1.22.4 kubeadm-1.22.4 kubectl-1.22.4 systemctl enable kubelet.service #删除组件 yum remove -y kubelet-1.22.4 kubeadm-1.22.4 kubectl-1.22.4 |
3.3、 初始化主节点
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kubeadm init --apiserver-advertise-address=0.0.0.0 --apiserver-cert-extra-sans=127.0.0.1 --ignore-preflight-errors=all --service-cidr=10.96.0.0/16 --pod-network-cidr=10.244.0.0/16 --upload-certs --cri-socket /run/containerd-cri/containerd.sock --image-repository=registry.aliyuncs.com/google_containers 参数： --image-repository #指定镜像仓库 |
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mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config |
3.4、节点加入集群
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kubeadm join 192.168.66.220:6443 --cri-socket /run/containerd-cri/containerd.sock --token ulgegm.v0yh0l4tsgjeng1z --discovery-token-ca-cert-hash sha256:24767d579b40a2df753472f7fc6a4777abf518c277b01eede81f356686295a9f |
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#指定--cri-socket string |
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kubectl get node |
4、部署网桥
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vim flannel.yaml |
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--- apiVersion: policy/v1beta1 kind: PodSecurityPolicy metadata: name: psp.flannel.unprivileged annotations: seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default spec: privileged: false volumes: - configMap - secret - emptyDir - hostPath allowedHostPaths: - pathPrefix: "/etc/cni/net.d" - pathPrefix: "/etc/kube-flannel" - pathPrefix: "/run/flannel" readOnlyRootFilesystem: false # Users and groups runAsUser: rule: RunAsAny supplementalGroups: rule: RunAsAny fsGroup: rule: RunAsAny # Privilege Escalation allowPrivilegeEscalation: false defaultAllowPrivilegeEscalation: false # Capabilities allowedCapabilities: ['NET_ADMIN'] defaultAddCapabilities: [] requiredDropCapabilities: [] # Host namespaces hostPID: false hostIPC: false hostNetwork: true hostPorts: - min: 0 max: 65535 # SELinux seLinux: # SELinux is unused in CaaSP rule: 'RunAsAny' --- kind: ClusterRole apiVersion: rbac.authorization.k8s.io/v1 metadata: name: flannel rules: - apiGroups: ['extensions'] resources: ['podsecuritypolicies'] verbs: ['use'] resourceNames: ['psp.flannel.unprivileged'] - apiGroups: - "" resources: - pods verbs: - get - apiGroups: - "" resources: - nodes verbs: - list - watch - apiGroups: - "" resources: - nodes/status verbs: - patch --- kind: ClusterRoleBinding apiVersion: rbac.authorization.k8s.io/v1 metadata: name: flannel roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: flannel subjects: - kind: ServiceAccount name: flannel namespace: kube-system --- apiVersion: v1 kind: ServiceAccount metadata: name: flannel namespace: kube-system --- kind: ConfigMap apiVersion: v1 metadata: name: kube-flannel-cfg namespace: kube-system labels: tier: node app: flannel data: cni-conf.json: | { "name": "cbr0", "cniVersion": "0.3.1", "plugins": [ { "type": "flannel", "delegate": { "hairpinMode": true, "isDefaultGateway": true } }, { "type": "portmap", "capabilities": { "portMappings": true } } ] } net-conf.json: | { "Network": "10.244.0.0/16", "Backend": { "Type": "vxlan" } } --- apiVersion: apps/v1 kind: DaemonSet metadata: name: kube-flannel-ds-amd64 namespace: kube-system labels: tier: node app: flannel spec: selector: matchLabels: app: flannel template: metadata: labels: tier: node app: flannel spec: affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: beta.kubernetes.io/os operator: In values: - linux - key: beta.kubernetes.io/arch operator: In values: - amd64 hostNetwork: true tolerations: - operator: Exists effect: NoSchedule serviceAccountName: flannel initContainers: - name: install-cni image: quay.io/coreos/flannel:v0.12.0-amd64 command: - cp args: - -f - /etc/kube-flannel/cni-conf.json - /etc/cni/net.d/10-flannel.conflist volumeMounts: - name: cni mountPath: /etc/cni/net.d - name: flannel-cfg mountPath: /etc/kube-flannel/ containers: - name: kube-flannel image: quay.io/coreos/flannel:v0.12.0-amd64 command: - /opt/bin/flanneld args: - --ip-masq - --kube-subnet-mgr resources: requests: cpu: "100m" memory: "250Mi" limits: cpu: "100m" memory: "250Mi" securityContext: privileged: false capabilities: add: ["NET_ADMIN"] env: - name: POD_NAME valueFrom: fieldRef: fieldPath: metadata.name - name: POD_NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace volumeMounts: - name: run mountPath: /run/flannel - name: flannel-cfg mountPath: /etc/kube-flannel/ volumes: - name: run hostPath: path: /run/flannel - name: cni hostPath: path: /etc/cni/net.d - name: flannel-cfg configMap: name: kube-flannel-cfg --- apiVersion: apps/v1 kind: DaemonSet metadata: name: kube-flannel-ds-arm64 namespace: kube-system labels: tier: node app: flannel spec: selector: matchLabels: app: flannel template: metadata: labels: tier: node app: flannel spec: affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: beta.kubernetes.io/os operator: In values: - linux - key: beta.kubernetes.io/arch operator: In values: - arm64 hostNetwork: true tolerations: - operator: Exists effect: NoSchedule serviceAccountName: flannel initContainers: - name: install-cni image: quay.io/coreos/flannel:v0.12.0-arm64 command: - cp args: - -f - /etc/kube-flannel/cni-conf.json - /etc/cni/net.d/10-flannel.conflist volumeMounts: - name: cni mountPath: /etc/cni/net.d - name: flannel-cfg mountPath: /etc/kube-flannel/ containers: - name: kube-flannel image: quay.io/coreos/flannel:v0.12.0-arm64 command: - /opt/bin/flanneld args: - --ip-masq - --kube-subnet-mgr resources: requests: cpu: "100m" memory: "250Mi" limits: cpu: "100m" memory: "250Mi" securityContext: privileged: false capabilities: add: ["NET_ADMIN"] env: - name: POD_NAME valueFrom: fieldRef: fieldPath: metadata.name - name: POD_NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace volumeMounts: - name: run mountPath: /run/flannel - name: flannel-cfg mountPath: /etc/kube-flannel/ volumes: - name: run hostPath: path: /run/flannel - name: cni hostPath: path: /etc/cni/net.d - name: flannel-cfg configMap: name: kube-flannel-cfg --- apiVersion: apps/v1 kind: DaemonSet metadata: name: kube-flannel-ds-arm namespace: kube-system labels: tier: node app: flannel spec: selector: matchLabels: app: flannel template: metadata: labels: tier: node app: flannel spec: affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: beta.kubernetes.io/os operator: In values: - linux - key: beta.kubernetes.io/arch operator: In values: - arm hostNetwork: true tolerations: - operator: Exists effect: NoSchedule serviceAccountName: flannel initContainers: - name: install-cni image: quay.io/coreos/flannel:v0.12.0-arm command: - cp args: - -f - /etc/kube-flannel/cni-conf.json - /etc/cni/net.d/10-flannel.conflist volumeMounts: - name: cni mountPath: /etc/cni/net.d - name: flannel-cfg mountPath: /etc/kube-flannel/ containers: - name: kube-flannel image: quay.io/coreos/flannel:v0.12.0-arm command: - /opt/bin/flanneld args: - --ip-masq - --kube-subnet-mgr resources: requests: cpu: "100m" memory: "250Mi" limits: cpu: "100m" memory: "250Mi" securityContext: privileged: false capabilities: add: ["NET_ADMIN"] env: - name: POD_NAME valueFrom: fieldRef: fieldPath: metadata.name - name: POD_NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace volumeMounts: - name: run mountPath: /run/flannel - name: flannel-cfg mountPath: /etc/kube-flannel/ volumes: - name: run hostPath: path: /run/flannel - name: cni hostPath: path: /etc/cni/net.d - name: flannel-cfg configMap: name: kube-flannel-cfg --- apiVersion: apps/v1 kind: DaemonSet metadata: name: kube-flannel-ds-ppc64le namespace: kube-system labels: tier: node app: flannel spec: selector: matchLabels: app: flannel template: metadata: labels: tier: node app: flannel spec: affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: beta.kubernetes.io/os operator: In values: - linux - key: beta.kubernetes.io/arch operator: In values: - ppc64le hostNetwork: true tolerations: - operator: Exists effect: NoSchedule serviceAccountName: flannel initContainers: - name: install-cni image: quay.io/coreos/flannel:v0.12.0-ppc64le command: - cp args: - -f - /etc/kube-flannel/cni-conf.json - /etc/cni/net.d/10-flannel.conflist volumeMounts: - name: cni mountPath: /etc/cni/net.d - name: flannel-cfg mountPath: /etc/kube-flannel/ containers: - name: kube-flannel image: quay.io/coreos/flannel:v0.12.0-ppc64le command: - /opt/bin/flanneld args: - --ip-masq - --kube-subnet-mgr resources: requests: cpu: "100m" memory: "250Mi" limits: cpu: "100m" memory: "250Mi" securityContext: privileged: false capabilities: add: ["NET_ADMIN"] env: - name: POD_NAME valueFrom: fieldRef: fieldPath: metadata.name - name: POD_NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace volumeMounts: - name: run mountPath: /run/flannel - name: flannel-cfg mountPath: /etc/kube-flannel/ volumes: - name: run hostPath: path: /run/flannel - name: cni hostPath: path: /etc/cni/net.d - name: flannel-cfg configMap: name: kube-flannel-cfg --- apiVersion: apps/v1 kind: DaemonSet metadata: name: kube-flannel-ds-s390x namespace: kube-system labels: tier: node app: flannel spec: selector: matchLabels: app: flannel template: metadata: labels: tier: node app: flannel spec: affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: beta.kubernetes.io/os operator: In values: - linux - key: beta.kubernetes.io/arch operator: In values: - s390x hostNetwork: true tolerations: - operator: Exists effect: NoSchedule serviceAccountName: flannel initContainers: - name: install-cni image: quay.io/coreos/flannel:v0.12.0-s390x command: - cp args: - -f - /etc/kube-flannel/cni-conf.json - /etc/cni/net.d/10-flannel.conflist volumeMounts: - name: cni mountPath: /etc/cni/net.d - name: flannel-cfg mountPath: /etc/kube-flannel/ containers: - name: kube-flannel image: quay.io/coreos/flannel:v0.12.0-s390x command: - /opt/bin/flanneld args: - --ip-masq - --kube-subnet-mgr resources: requests: cpu: "100m" memory: "250Mi" limits: cpu: "100m" memory: "250Mi" securityContext: privileged: false capabilities: add: ["NET_ADMIN"] env: - name: POD_NAME valueFrom: fieldRef: fieldPath: metadata.name - name: POD_NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace volumeMounts: - name: run mountPath: /run/flannel - name: flannel-cfg mountPath: /etc/kube-flannel/ volumes: - name: run hostPath: path: /run/flannel - name: cni hostPath: path: /etc/cni/net.d - name: flannel-cfg configMap: name: kube-flannel-cfg |
部署flannel
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kubectl apply -f flannel.yaml |
查看
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kubectl get pod -A |
5.验证集群插件( 验证容器和容器之间通信 )
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启动多个tool容器 |
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apiVersion: apps/v1 kind: Deployment metadata: name: app spec: replicas: 10 selector: matchLabels: app: demo template: metadata: labels: app: demo run: app spec: containers: - name: app image: busybox args: - /bin/sh - -c - sleep 10; touch /tmp/healthy; sleep 30000 readinessProbe: exec: command: - cat - /tmp/healthy initialDelaySeconds: 10 periodSeconds: 5 |
(完)
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