准备环境
| IP | 主机名 | 系统 |
|---|---|---|
| 192.168.101.10 | master | centos7.9 |
| 192.168.101.9 | node1 | centos7.9 |
| 192.168.101.8 | node2 | centos7.9 |
系统初始化 （所有机器都执行）
# 1、关闭所有swap
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab
# 2、关闭当前的selinux
setenforce 0
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
sed -i 's/SELINUX=permissive/SELINUX=disabled/g' /etc/selinux/config
#注意：在一些云主机上，比如腾讯云，阿里云，修改过selinux且ssh端口改成非 22 后可能会导致登录不了。需要先做以下操作
# 3、关闭防火墙
iptables -F
iptables -X
iptables -Z
systemctl stop firewalld
systemctl disable firewalld
# 4、修改内核参数
echo vm.max_map_count=262144 >> /etc/sysctl.conf
echo net.ipv6.conf.all.disable_ipv6 = 1 >> /etc/sysctl.conf
echo net.ipv6.conf.default.disable_ipv6 = 1 >> /etc/sysctl.conf
echo net.ipv4.ip_forward = 1 >> /etc/sysctl.conf
sysctl -p
# 5. 增加hosts
cat >> /etc/hosts <<\EOF
192.168.101.10 master
192.168.101.9 node1
192.168.101.8 node2
EOF
修改主机名
hostnamectl set-hostname master # 192.168.101.10 服务器操作
hostnamectl set-hostname node1 # 192.168.101.9 服务器操作
hostnamectl set-hostname node2 # 192.168.101.8 服务器操作
安装操作Docker（所有机器都执行）
# 1 添加阿里云镜像
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# 2 查看可以安装的docker版本
yum list docker-ce --showduplicates
# 3 安装docker
sudo yum install docker-ce-24.0.2
# 4 设置cgroup驱动，推荐systemd
mkdir /etc/docker/
cat > /etc/docker/daemon.json <<\EOF
{
"registry-mirrors": ["https://6ze43vnb.mirror.aliyuncs.com"],
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2"
}
EOF
# 5 启动docker，并设置开机自启
systemctl daemon-reload
systemctl start docker
systemctl enable docker
安装 kubeadm, kubelet,kubectl (所有服务器都执行)
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
yum install -y kubelet-1.20.0 kubeadm-1.20.0 kubectl-1.20.0
systemctl enable kubelet
下载k8s v1.20.0 所需镜像 （所有服务器都执行）
docker pull registry.aliyuncs.com/google_containers/kube-apiserver:v1.20.0
docker pull registry.aliyuncs.com/google_containers/kube-controller-manager:v1.20.0
docker pull registry.aliyuncs.com/google_containers/kube-scheduler:v1.20.0
docker pull registry.aliyuncs.com/google_containers/kube-proxy:v1.20.0
docker pull registry.aliyuncs.com/google_containers/pause:3.2
docker pull registry.aliyuncs.com/google_containers/etcd:3.4.13-0
docker pull registry.aliyuncs.com/google_containers/coredns:1.7.0
docker tag registry.aliyuncs.com/google_containers/kube-apiserver:v1.20.0 k8s.gcr.io/kube-apiserver:v1.20.0
docker tag registry.aliyuncs.com/google_containers/kube-controller-manager:v1.20.0 k8s.gcr.io/kube-controller-manager:v1.20.0
docker tag registry.aliyuncs.com/google_containers/kube-scheduler:v1.20.0 k8s.gcr.io/kube-scheduler:v1.20.0
docker tag registry.aliyuncs.com/google_containers/kube-proxy:v1.20.0 k8s.gcr.io/kube-proxy:v1.20.0
docker tag registry.aliyuncs.com/google_containers/pause:3.2 k8s.gcr.io/pause:3.2
docker tag registry.aliyuncs.com/google_containers/etcd:3.4.13-0 k8s.gcr.io/etcd:3.4.13-0
docker tag registry.aliyuncs.com/google_containers/coredns:1.7.0 k8s.gcr.io/coredns:1.7.0
docker rmi registry.aliyuncs.com/google_containers/kube-apiserver:v1.20.0
docker rmi registry.aliyuncs.com/google_containers/kube-controller-manager:v1.20.0
docker rmi registry.aliyuncs.com/google_containers/kube-scheduler:v1.20.0
docker rmi registry.aliyuncs.com/google_containers/kube-proxy:v1.20.0
docker rmi registry.aliyuncs.com/google_containers/pause:3.2
docker rmi registry.aliyuncs.com/google_containers/etcd:3.4.13-0
docker rmi registry.aliyuncs.com/google_containers/coredns:1.7.0
部署Kubernetes Master（192.168.101.10服务器执行）
kubeadm init \
--apiserver-advertise-address=192.168.101.10 \
--service-cidr=10.1.0.0/16 \
--pod-network-cidr=10.244.0.0/16
根据提示配置主节点
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
export KUBECONFIG=/etc/kubernetes/admin.conf
node节点加入集群（在node节点服务器执行）
# 执行添加节点命令
kubeadm join 192.168.101.10:6443 \
--token ltozf7.jx7r8j30xkendw35 \
--discovery-token-ca-cert-hash sha256:c678f5782568466980ed61f8649f3d0334e9e8ef8b84d9ff1f8775c778658c9f
# 也可以使用下面的命令生成添加节点的命令
kubeadm token create --print-join-command
安装网络插件（未安装pod网络插件，所以集群STATUS都是NotReady）
yaml文件下载：github.com/coreos/flan…，或者直接执行下面的yaml
---
kind: Namespace
apiVersion: v1
metadata:
name: kube-flannel
labels:
k8s-app: flannel
pod-security.kubernetes.io/enforce: privileged
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
labels:
k8s-app: flannel
name: flannel
rules:
- apiGroups:
- ""
resources:
- pods
verbs:
- get
- apiGroups:
- ""
resources:
- nodes
verbs:
- get
- list
- watch
- apiGroups:
- ""
resources:
- nodes/status
verbs:
- patch
- apiGroups:
- networking.k8s.io
resources:
- clustercidrs
verbs:
- list
- watch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
labels:
k8s-app: flannel
name: flannel
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: flannel
subjects:
- kind: ServiceAccount
name: flannel
namespace: kube-flannel
---
apiVersion: v1
kind: ServiceAccount
metadata:
labels:
k8s-app: flannel
name: flannel
namespace: kube-flannel
---
kind: ConfigMap
apiVersion: v1
metadata:
name: kube-flannel-cfg
namespace: kube-flannel
labels:
tier: node
k8s-app: flannel
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
namespace: kube-flannel
labels:
tier: node
app: flannel
k8s-app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni-plugin
image: docker.io/flannel/flannel-cni-plugin:v1.1.2
#image: docker.io/rancher/mirrored-flannelcni-flannel-cni-plugin:v1.1.2
command:
- cp
args:
- -f
- /flannel
- /opt/cni/bin/flannel
volumeMounts:
- name: cni-plugin
mountPath: /opt/cni/bin
- name: install-cni
image: docker.io/flannel/flannel:v0.22.0
#image: docker.io/rancher/mirrored-flannelcni-flannel:v0.22.0
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: docker.io/flannel/flannel:v0.22.0
#image: docker.io/rancher/mirrored-flannelcni-flannel:v0.22.0
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: EVENT_QUEUE_DEPTH
value: "5000"
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
- name: xtables-lock
mountPath: /run/xtables.lock
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni-plugin
hostPath:
path: /opt/cni/bin
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
- name: xtables-lock
hostPath:
path: /run/xtables.lock
type: FileOrCreate
部署网络插件
kubectl apply -f kube-flannel.yml
[root@node1 ~]# kubectl -n kube-flannel get pod
NAME READY STATUS RESTARTS AGE
kube-flannel-ds-4w55g 1/1 Running 0 82m
kube-flannel-ds-gjrdt 1/1 Running 0 82m
kube-flannel-ds-xzjk7 1/1 Running 0 82m
检查
# 1 检查kube-system下的所有pod
[root@node1 ~]# kubectl -n kube-system get pod
NAME READY STATUS RESTARTS AGE
coredns-74ff55c5b-d47nf 1/1 Running 0 2d22h
coredns-74ff55c5b-hb9t9 1/1 Running 0 2d22h
etcd-master 1/1 Running 1 2d22h
kube-apiserver-master 1/1 Running 1 2d22h
kube-controller-manager-master 1/1 Running 3 2d22h
kube-proxy-cvvdt 1/1 Running 1 2d22h
kube-proxy-llrk2 1/1 Running 0 95m
kube-proxy-s9jct 1/1 Running 0 86m
kube-scheduler-master 1/1 Running 4 2d22h
# 2 检查网络插件
[root@node1 ~]# kubectl -n kube-flannel get pod
NAME READY STATUS RESTARTS AGE
kube-flannel-ds-4w55g 1/1 Running 0 82m
kube-flannel-ds-gjrdt 1/1 Running 0 82m
kube-flannel-ds-xzjk7 1/1 Running 0 82m
# 3 如果上面检查都正常，检查node节点状态
[root@node1 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
master Ready control-plane,master 2d22h v1.20.0
node1 Ready <none> 97m v1.20.0
node2 Ready <none> 87m v1.20.0
# 所有节点都是Ready状态，安装完成
kubectl命令自动补全
[root@k8s-master:~]# yum -y install bash-completion && yum -y install mlocate
[root@k8s-master:~]# locate bash_completion /usr/share/bash-completion/bash_completion
[root@k8s-master:~]# source /usr/share/bash-completion/bash_completion
[root@k8s-master:~]# source <(kubectl completion bash)
[root@k8s-master:~]# echo "source <(kubectl completion bash)" >> ~/.bashrc
【报错处理】
locate: can not stat () `/var/lib/mlocate/mlocate.db': No such file or directory
【处理办法】
[root@k8s-master:~]# updatedb
