使用kubeadm初始化IPV4/IPV6集群
图片
CentOS 配置YUM源
代码语言：javascript复制cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=kubernetes
baseurl=https://mirrors.ustc.edu.cn/kubernetes/yum/repos/kubernetes-el7-$basearch
enabled=1
EOF
setenforce 0
yum install -y kubelet kubeadm kubectl
# 如安装老版本
# yum install kubelet-1.16.9-0 kubeadm-1.16.9-0 kubectl-1.16.9-0
systemctl enable kubelet && systemctl start kubelet
# 将 SELinux 设置为 permissive 模式（相当于将其禁用）
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
sudo systemctl enable --now kubelet
Ubuntu 配置APT源
代码语言：javascript复制curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.ustc.edu.cn/kubernetes/apt kubernetes-xenial main
EOF
apt-get update
apt-get install -y kubelet kubeadm kubectl
# 如安装老版本
# apt install kubelet=1.23.6-00 kubeadm=1.23.6-00 kubectl=1.23.6-00
配置containerd
代码语言：javascript复制wget https://github.com/containerd/containerd/releases/download/v1.6.4/cri-containerd-cni-1.6.4-linux-amd64.tar.gz
#解压
tar -C / -xzf cri-containerd-cni-1.6.4-linux-amd64.tar.gz
#创建服务启动文件
cat > /etc/systemd/system/containerd.service <<EOF
[Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target local-fs.target
[Service]
ExecStartPre=-/sbin/modprobe overlay
ExecStart=/usr/local/bin/containerd
Type=notify
Delegate=yes
KillMode=process
Restart=always
RestartSec=5
LimitNPROC=infinity
LimitCORE=infinity
LimitNOFILE=infinity
TasksMax=infinity
OOMScoreAdjust=-999
[Install]
WantedBy=multi-user.target
EOF
mkdir -p /etc/containerd
containerd config default | tee /etc/containerd/config.toml
sed -i "s#k8s.gcr.io#registry.cn-hangzhou.aliyuncs.com/chenby#g" /etc/containerd/config.toml
systemctl daemon-reload
systemctl enable --now containerd
配置基础环境
代码语言：javascript复制cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0
net.ipv6.conf.all.forwarding = 1
EOF
sudo sysctl --system
hostnamectl set-hostname k8s-master01
hostnamectl set-hostname k8s-node01
hostnamectl set-hostname k8s-node02
sed -ri 's/.*swap.*/#&/' /etc/fstab
swapoff -a && sysctl -w vm.swappiness=0
cat /etc/fstab
hostnamectl set-hostname k8s-master01
hostnamectl set-hostname k8s-node01
hostnamectl set-hostname k8s-node02
cat > /etc/hosts <<EOF
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
2408:8207:78ce:7561::21 k8s-master01
2408:8207:78ce:7561::22 k8s-node01
2408:8207:78ce:7561::23 k8s-node02
10.0.0.21 k8s-master01
10.0.0.22 k8s-node01
10.0.0.23 k8s-node02
EOF
初始化安装
代码语言：javascript复制root@k8s-master01:~# kubeadm config images list --image-repository registry.cn-hangzhou.aliyuncs.com/chenby
registry.cn-hangzhou.aliyuncs.com/chenby/kube-apiserver:v1.24.0
registry.cn-hangzhou.aliyuncs.com/chenby/kube-controller-manager:v1.24.0
registry.cn-hangzhou.aliyuncs.com/chenby/kube-scheduler:v1.24.0
registry.cn-hangzhou.aliyuncs.com/chenby/kube-proxy:v1.24.0
registry.cn-hangzhou.aliyuncs.com/chenby/pause:3.7
registry.cn-hangzhou.aliyuncs.com/chenby/etcd:3.5.3-0
registry.cn-hangzhou.aliyuncs.com/chenby/coredns:v1.8.6
root@k8s-master01:~# vim kubeadm.yaml
root@k8s-master01:~# cat kubeadm.yaml
apiVersion: kubeadm.k8s.io/v1beta3
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: "2408:8207:78ce:7561::21"
bindPort: 6443
nodeRegistration:
taints:
- effect: PreferNoSchedule
key: node-role.kubernetes.io/master
---
apiVersion: kubeadm.k8s.io/v1beta3
kind: ClusterConfiguration
kubernetesVersion: v1.24.0
imageRepository: registry.cn-hangzhou.aliyuncs.com/chenby
networking:
podSubnet: 172.16.0.0/12,fc00::/48
serviceSubnet: 10.96.0.0/12,fd00::/108
root@k8s-master01:~#
root@k8s-master01:~#
root@k8s-master01:~# kubeadm init --config=kubeadm.yaml
[init] Using Kubernetes version: v1.24.0
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [k8s-master01 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 10.0.0.21]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [k8s-master01 localhost] and IPs [10.0.0.21 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [k8s-master01 localhost] and IPs [10.0.0.21 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Starting the kubelet
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[apiclient] All control plane components are healthy after 6.504341 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config" in namespace kube-system with the configuration for the kubelets in the cluster
[upload-certs] Skipping phase. Please see --upload-certs
[mark-control-plane] Marking the node k8s-master01 as control-plane by adding the labels: [node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]
[mark-control-plane] Marking the node k8s-master01 as control-plane by adding the taints [node-role.kubernetes.io/master:PreferNoSchedule]
[bootstrap-token] Using token: lnodkp.3n8i4m33sqwg39w2
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] Configured RBAC rules to allow Node Bootstrap tokens to get nodes
[bootstrap-token] Configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] Configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] Configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Alternatively, if you are the root user, you can run:
export KUBECONFIG=/etc/kubernetes/admin.conf
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 10.0.0.21:6443 --token lnodkp.3n8i4m33sqwg39w2
--discovery-token-ca-cert-hash sha256:0ed7e18ea2b49bb599bc45e72f764bbe034ef1dce47729f2722467c167754da8
root@k8s-master01:~#
root@k8s-master01:~# mkdir -p $HOME/.kube
root@k8s-master01:~# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
root@k8s-master01:~# sudo chown $(id -u):$(id -g) $HOME/.kube/config
root@k8s-master01:~#
root@k8s-node01:~# kubeadm join 10.0.0.21:6443 --token qf3z22.qwtqieutbkik6dy4
> --discovery-token-ca-cert-hash sha256:2ade8c834a41cc1960993a600c89fa4bb86e3594f82e09bcd42633d4defbda0d
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
root@k8s-node01:~#
root@k8s-node02:~# kubeadm join 10.0.0.21:6443 --token qf3z22.qwtqieutbkik6dy4
> --discovery-token-ca-cert-hash sha256:2ade8c834a41cc1960993a600c89fa4bb86e3594f82e09bcd42633d4defbda0d
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
root@k8s-node02:~#
查看集群
代码语言：javascript复制root@k8s-master01:~# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master01 Ready control-plane 111s v1.24.0
k8s-node01 Ready <none> 82s v1.24.0
k8s-node02 Ready <none> 92s v1.24.0
root@k8s-master01:~#
root@k8s-master01:~#
root@k8s-master01:~# kubectl get pod -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-bc77466fc-jxkpv 1/1 Running 0 83s
kube-system coredns-bc77466fc-nrc9l 1/1 Running 0 83s
kube-system etcd-k8s-master01 1/1 Running 0 87s
kube-system kube-apiserver-k8s-master01 1/1 Running 0 89s
kube-system kube-controller-manager-k8s-master01 1/1 Running 0 87s
kube-system kube-proxy-2lgrn 1/1 Running 0 83s
kube-system kube-proxy-69p9r 1/1 Running 0 47s
kube-system kube-proxy-g58m2 1/1 Running 0 42s
kube-system kube-scheduler-k8s-master01 1/1 Running 0 87s
root@k8s-master01:~#
配置calico
代码语言：javascript复制wget https://raw.githubusercontent.com/cby-chen/Kubernetes/main/yaml/calico-ipv6.yaml
# vim calico-ipv6.yaml
# calico-config ConfigMap处
"ipam": {
"type": "calico-ipam",
"assign_ipv4": "true",
"assign_ipv6": "true"
},
- name: IP
value: "autodetect"
- name: IP6
value: "autodetect"
- name: CALICO_IPV4POOL_CIDR
value: "172.16.0.0/16"
- name: CALICO_IPV6POOL_CIDR
value: "fc00::/48"
- name: FELIX_IPV6SUPPORT
value: "true"
kubectl apply -f calico-ipv6.yaml
测试IPV6
代码语言：javascript复制root@k8s-master01:~# cat cby.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: chenby
spec:
replicas: 3
selector:
matchLabels:
app: chenby
template:
metadata:
labels:
app: chenby
spec:
containers:
- name: chenby
image: nginx
resources:
limits:
memory: "128Mi"
cpu: "500m"
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: chenby
spec:
ipFamilyPolicy: PreferDualStack
ipFamilies:
- IPv6
- IPv4
type: NodePort
selector:
app: chenby
ports:
- port: 80
targetPort: 80
kubectl apply -f cby.yaml
root@k8s-master01:~# kubectl get pod
NAME READY STATUS RESTARTS AGE
chenby-57479d5997-6pfzg 1/1 Running 0 6m
chenby-57479d5997-jjwpk 1/1 Running 0 6m
chenby-57479d5997-pzrkc 1/1 Running 0 6m
root@k8s-master01:~# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
chenby NodePort fd00::f816 <none> 80:30265/TCP 6m7s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 168m
root@k8s-master01:~# curl -I http://[2408:8207:78ce:7561::21]:30265/
HTTP/1.1 200 OK
Server: nginx/1.21.6
Date: Wed, 11 May 2022 07:01:43 GMT
Content-Type: text/html
Content-Length: 615
Last-Modified: Tue, 25 Jan 2022 15:03:52 GMT
Connection: keep-alive
ETag: "61f01158-267"
Accept-Ranges: bytes
root@k8s-master01:~# curl -I http://10.0.0.21:30265/
HTTP/1.1 200 OK
Server: nginx/1.21.6
Date: Wed, 11 May 2022 07:01:54 GMT
Content-Type: text/html
Content-Length: 615
Last-Modified: Tue, 25 Jan 2022 15:03:52 GMT
Connection: keep-alive
ETag: "61f01158-267"
Accept-Ranges: bytes
