kubeadm安装K8s
节点规划
Hostname
外网IP
内网IP
k8s-master-01
10.0.0.91
172.16.1.91
k8s-node-01
10.0.0.92
172.16.1.92
k8s-node-02
10.0.0.93
172.16.1.93
修改hosts
cat >> /etc/hosts <<EOF
172.16.1.91 k8s-master-01
172.16.1.92 k8s-node-01
172.16.1.93 k8s-node-01
EOF关闭SeLinux
sed -i 's#enforcing#disabled#g' /etc/sysconfig/selinux
setenforce 0关闭 swap 分区
swapoff -a
sed -i.bak 's/^.*centos-swap/#&/g' /etc/fstab
echo 'KUBELET_EXTRA_ARGS="--fail-swap-on=false"' > /etc/sysconfig/kubelet配置国内 YUM 源
mv -f /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum makecache
# 更新系统（不更新内核）
yum update -y --exclud=kernel*升级系统内核版本
curl -o ./kernel-lt.el7.elrepo.x86_64.rpm https://mirrors.tuna.tsinghua.edu.cn/elrepo/kernel/el7/x86_64/RPMS/kernel-lt-5.4.87-1.el7.elrepo.x86_64.rpm
curl -o ./kernel-lt-devel.el7.elrepo.x86_64.rpm https://mirrors.tuna.tsinghua.edu.cn/elrepo/kernel/el7/x86_64/RPMS/kernel-lt-devel-5.4.87-1.el7.elrepo.x86_64.rpm
yum localinstall -y kernel-lt*
grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg
grubby --default-kernel
reboot安装 ipvs
yum install -y conntrack-tools ipvsadm ipset conntrack libseccomp
cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
ipvs_modules="ip_vs ip_vs_lc ip_vs_wlc ip_vs_rr ip_vs_wrr ip_vs_lblc ip_vs_lblcr ip_vs_dh ip_vs_sh ip_vs_fo ip_vs_nq ip_vs_sed ip_vs_ftp nf_conntrack"
for kernel_module in \${ipvs_modules}; do
/sbin/modinfo -F filename \${kernel_module} > /dev/null 2>&1
if [ $? -eq 0 ]; then
/sbin/modprobe \${kernel_module}
fi
done
EOF
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep ip_vs内核参数优化
cat > /etc/sysctl.d/k8s.conf << EOF
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 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.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp.keepaliv.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.top_timestamps = 0
net.core.somaxconn = 16384
EOF
sysctl --system安装基础软件
yum install wget expect vim net-tools ntp bash-completion ipvsadm ipset jq iptables conntrack sysstat libseccomp -y关闭防火墙
systemctl disable --now firewalld安装 Docker
安装Docker同步集群时间
yum install ntp -y
ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo 'Asia/Shanghai' > /etc/timezone
ntpdate time2.aliyun.com
# 写入定时任务
*/1 * * * * ntpdate time2.aliyun.com > /dev/null 2>&1配置 Kubernetes 源
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=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 kubeadm kubectl
systemctl enable kubelet && systemctl start kubelet导入镜像
ls -lh /docker_images/ | awk 'NR>1 {print $NF}' | sed -r 's#(.*)#docker image load -i /docker_images/\1#' | bash下载镜像
# 若无本地镜像则需要进行下载
docker pull registry.cn-chengdu.aliyuncs.com/willsk8s/kube-apiserver:v1.20.1
docker pull registry.cn-chengdu.aliyuncs.com/willsk8s/kube-controller-manager:v1.20.1
docker pull registry.cn-chengdu.aliyuncs.com/willsk8s/kube-scheduler:v1.20.1
docker pull registry.cn-chengdu.aliyuncs.com/willsk8s/kube-proxy:v1.20.1
docker pull registry.cn-chengdu.aliyuncs.com/willsk8s/pause:3.2
docker pull registry.cn-chengdu.aliyuncs.com/willsk8s/etcd:3.4.13-0
docker pull registry.cn-chengdu.aliyuncs.com/willsk8s/coredns:1.7.0
docker pull registry.cn-chengdu.aliyuncs.com/willsk8s/flannel:v0.13.1-rc1
# 对下载的镜像进行重新打标签
docker tag registry.cn-chengdu.aliyuncs.com/willsk8s/kube-apiserver:v1.20.1 k8s.gcr.io/kube-apiserver:v1.20.1
docker tag registry.cn-chengdu.aliyuncs.com/willsk8s/kube-controller-manager:v1.20.1 k8s.gcr.io/kube-controller-manager:v1.20.1
docker tag registry.cn-chengdu.aliyuncs.com/willsk8s/kube-scheduler:v1.20.1 k8s.gcr.io/kube-scheduler:v1.20.1
docker tag registry.cn-chengdu.aliyuncs.com/willsk8s/kube-proxy:v1.20.1 k8s.gcr.io/kube-proxy:v1.20.1
docker tag registry.cn-chengdu.aliyuncs.com/willsk8s/pause:3.2 k8s.gcr.io/pause:3.2
docker tag registry.cn-chengdu.aliyuncs.com/willsk8s/etcd:3.4.13-0 k8s.gcr.io/etcd:3.4.13-0
docker tag registry.cn-chengdu.aliyuncs.com/willsk8s/coredns:1.7.0 k8s.gcr.io/coredns:1.7.0
docker tag registry.cn-chengdu.aliyuncs.com/willsk8s/flannel:v0.13.1-rc1 quay.io/coreos/:v0.13.1-rc1-----------------------------------以上步骤在主从节点都需要执行--------------------------
节点初始化
# master 节点执行
kubeadm init \
# --image-repository=registry.cn-chengdu.aliyuncs.com/willsk8s \
--kubernetes-version=v1.20.1 \
--service-cidr=10.96.0.0/12 \
--pod-network-cidr=10.244.0.0/16
# 若指定私有镜像仓库需先登录
# docker login --username=any****@gmail.com registry.cn-chengdu.aliyuncs.com配置 kubernetes 用户信息
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config增加命令提示
yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc安装集群网络插件
cat > kube-flannel.yml <<EOF
---
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', 'NET_RAW']
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
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: kubernetes.io/os
operator: In
values:
- linux
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni
image: quay.io/coreos/flannel:v0.13.1-rc1
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:v0.13.1-rc1
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
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
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
EOF# 下载flannel
# wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
# 换阿里云自建的容器镜像
# sed -i 's#quay.io/coreos/flannel#registry.cn-chengdu.aliyuncs.com/willsk8s/flannel#g' kube-flannel.yml
# docker pull registry.cn-chengdu.aliyuncs.com/willsk8s/flannel:v0.13.1-rc1
kubectl apply -f kube-flannel.yml
kubectl get pods -n kube-system
kubectl get pods -n kube-system -o wide -wNode 节点加入集群
# 使用 master 节点创建 TOKEN
kubeadm token create --print-join-command
# Node 节点执行加入命令
kubeadm join 10.0.0.91:6443 --token 08d1bv.86il62ssgffr7gas \
--discovery-token-ca-cert-hash sha256:7618fb8e93c806791bf41220ab458c6eab355394a269d65177cabb9aa9b11566查看部署结果
kubectl get nodes -o wide验证部署结果
# 部署Nginx，看能否正常提供服务
kubectl get svc
kubectl create deployment nginx --image=nginx
kubectl expose deployment nginx --port=80 --type=NodePort
kubectl get pods
kubectl get pods -o wide
kubectl get svc
# 使用浏览器进行访问，看Nginx是否正常提供服务Last updated