Centos 7 安装K8S
快速安装k8s+docker
文章目录
安装前准备
这里部署K8S 一主两从,需要三台虚拟机
分别是
192.168.31.100
192.168.31.101
192.168.31.102
192.168.31.100 部署为主节点,其他两台部署为工作节点
每台虚拟机都需要2核2G,这是最低要求
每台虚拟机都需要安装docker
安装docker
对三台虚拟机安装docker
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum install docker-ce -y
启动docker并设置开机启动
systemctl start docker
systemctl enable docker
测试docker安装情况
docker version
安装成功
安装K8S
三台虚拟机都需要配置
1、关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
2、关闭 selinux
永久关闭
sed -i 's/enforcing/disabled/' /etc/selinux/config
临时关闭
setenforce 0
因为永久关闭需要重启才有效,所以这里两步都要执行
3、关闭 swap
永久关闭
vi /etc/fstab
# 注释掉swap这行
# /dev/mapper/centos-swap swap swap defaults 0 0
临时关闭
swapoff -a
同上,两步都要执行
4、给三台机器分别设置主机名
192.168.31.100 虚拟机上
hostnamectl set-hostname k8s-master
192.168.31.101 虚拟机上
hostnamectl set-hostname k8s-worker1
192.168.31.102 虚拟机上
hostnamectl set-hostname k8s-worker2
5、在 k8s-master机器添加hosts,执行如下命令,ip需要修改成你自己机器的ip
cat >> /etc/hosts << EOF
192.168.31.100 k8s-master
192.168.31.101 k8s-worker1
192.168.31.102 k8s-worker2
EOF
6、将桥接的IPv4流量传递到iptables
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system # 生效
7、设置时间同步
yum install ntpdate -y
ntpdate time.windows.com
8、添加k8s yum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=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
9、如果之前安装过k8s,先卸载旧版本
yum remove -y kubelet kubeadm kubectl
10、安装kubelet、kubeadm、kubectl 指定版本为1.23.6
yum install kubectl-1.23.6 kubeadm-1.23.6 kubelet-1.23.6 -y
启动kubelet 并且设置开机启动
systemctl start kubelet
systemctl enable kubelet
11、主节点上进行初始化
第一个IP要写自己的主节点IP,其他的不变
kubeadm init --apiserver-advertise-address=192.168.31.100 --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.23.6 --service-cidr=10.96.0.0/12 --pod-network-cidr=10.244.0.0/16 --v=5
初始化报错
按照提示执行命令
这里说明kubelet没有启动
journalctl -xeu kubelet
查看日志
这里需要将docker设置为 systemd
vi /etc/docker/daemon.json
输入内容
这里顺便把docker源也配置了
{
"registry-mirrors": [
"https://registry.docker-cn.com"
],
"dns": ["8.8.8.8", "8.8.4.4"],
"exec-opts": ["native.cgroupdriver=systemd"]
}
重启docker 和 kubelet
systemctl restart docker
systemctl restart kubelet
重新运行
systemctl status kubelet
启动完毕
重新初始化
kubeadm init --apiserver-advertise-address=192.168.31.99 --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.23.6 --service-cidr=10.96.0.0/12 --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=all --v=5
这里忽略错误运行,因为前面第一次初始化过程中已经有启动部分服务了
看到这段代码,说明已经初始化成功了
[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 192.168.31.100:6443 --token uc8655.kje89tanxx58lyh6 \
--discovery-token-ca-cert-hash sha256:5a42a369fbb783bfc5bd73c9746e4c2d74c96440af8be8feae31bae2fa2f8c7a
这里按照提示在master执行命令
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
这一段表示将节点加入到192.168.31.100这个master的集群,两台从节点执行这段代码。
执行这段代码,代表作为这台机器的从节点,需要参与运行部署的服务,主节点可以执行,也可以不执行,执行代表主节点也要做部署工作,这里推荐主节点不执行
kubeadm join 192.168.31.100:6443 --token uc8655.kje89tanxx58lyh6 \
--discovery-token-ca-cert-hash sha256:5a42a369fbb783bfc5bd73c9746e4c2d74c96440af8be8feae31bae2fa2f8c7a
执行kubectl get nodes
这里我们看到所有节点状态都是NotReady,说明集群不正常
kubectl describe nodes
查看集群状态,这里可以看到报错信息
container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady
message:docker: network plugin is not ready: cni config uninitialized
这里需要下载flannel镜像
在k8s主节点上运行
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
如果无法访问https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
可以新建一个文件 kube-flannel.yml
文件内容为
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-plugin
image: rancher/mirrored-flannelcni-flannel-cni-plugin:v1.2
command:
- cp
args:
- -f
- /flannel
- /opt/cni/bin/flannel
volumeMounts:
- name: cni-plugin
mountPath: /opt/cni/bin
- name: install-cni
image: quay.io/coreos/flannel:v0.15.0
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: quay.io/coreos/flannel:v0.15.0
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-plugin
hostPath:
path: /opt/cni/bin
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
运行代码
kubectl apply -f kube-flannel.yml
稍等片刻
自动生成 /etc/cni/net.d/10-flannel.conflist 之后,即可正常使用
看到3个节点都已经是Ready了
这里就安装完成了
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