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最新kubernetes v1.22.1高可用集群部署_kubernetesv1.22.12部署
作者：不正经 | 2024-03-28 03:26:49
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kubernetesv1.22.12部署
最新kubernetes v1.22.1高可用集群部署
一、简述：
kubeadm部署Kubernetes 1.22.1多Master高可用集群；
| **节点 ** | **角色 ** | **IP ** | 部署软件 |
|---|---|---|---|
| master-1 | master | 192.168.5.11 | kubeadm、kubelet、kubectl、docker、haproxy、keepalived |
| master-2 | master | 192.168.5.12 | kubeadm、kubelet、kubectl、docker、haproxy、keepalived |
| master-3 | master | 192.168.5.13 | kubeadm、kubelet、kubectl、docker、haproxy、keepalived |
| controPlane VIP | VIP | 192.168.5.50 | |
| worker-1 | worker | 192.168.5.21 | kubeadm、kubelet、kubectl、docker |
架构图:
说明:
kubernetes集群，etcd分别安装在3个主节点上，controlplane的服务都是kubeadm部署，用pod形式存在3个主节点上。
loadbalancer通过haproxy来实现负载均衡，与apiserver通信
keepalived的VIP与所在节点的controlplane(controller-manager scheduler)通信，集群运行时，只有一个controlplane起作用，其他2个属于standby。
二、基础环境部署(全部主机执行)
安装基本软件与升级内核：
yum -y install vim git lrzsz wget net-tools bash-completion
sudo yum -y update，需要下载1G左右的升级文件。
sudo yum update -y kernel，只升级内核只需要下载100M左右的升级文件。
内核升级完毕后，重启。然后重新启动Docker服务，成功。
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关闭所有节点的Slinux/防火墙：
setenforce 0 \
&& sed -i 's/^SELINUX=.*$/SELINUX=disabled/' /etc/selinux/config \
&& getenforce
systemctl stop firewalld \
&& systemctl daemon-reload \
&& systemctl disable firewalld \
&& systemctl daemon-reload \
&& systemctl status firewalld
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添加Host解析：
cat <<EOF > /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.5.11 master-1
192.168.5.12 master-2
192.168.5.13 master-3
192.168.5.21 worker-1
EOF
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同步节点系统时间：
yum install ntp -y
ntpdate cn.pool.ntp.org
timedatectl set-timezone Asia/Shanghai
timedatectl set-local-rtc 1
timedatectl set-ntp 1
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设置网桥：
配置L2网桥在转发包时会被iptables的FORWARD规则所过滤，CNI插件需要该配置；创建/etc/sysctl.d/k8s.conf文件；
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
# 执行命令使其修改生效
modprobe br_netfilter \
&& sysctl -p /etc/sysctl.d/k8s.conf
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关闭交换分区：
swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab
echo vm.swappiness = 0 >> /etc/sysctl.d/k8s.conf
sysctl -p /etc/sysctl.d/k8s.conf
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安装设置Ipvs：
yum -y install ipvsadm ipset
#创建ipvs脚本
cat > /etc/sysconfig/modules/ipvs.modules << EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF
#执行脚本，验证配置
chmod 755 /etc/sysconfig/modules/ipvs.modules
bash /etc/sysconfig/modules/ipvs.modules
lsmod | grep -e ip_vs -e nf_conntrack_ipv4
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部署密钥登陆：
[root@master01 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
b7:ac:c3:65:06:97:80:2a:f6:88:13:9a:dd:8a:a1:d6 root@node1
The key's randomart image is:
+--[ RSA 2048]----+
| . |
| . . |
| . . . |
|. o . . o |
|.* = So. |
|* o o o+. |
|.+.. . +o |
|o..E o. |
|. .. |
+-----------------+
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分发密钥：
for host in master-1 master-2 master-3; do ssh-copy-id -i ~/.ssh/id_rsa.pub $host; done
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部署Docker：
＃卸载已经安装的docker
sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
#部署依赖与源
sudo yum install -y yum-utils
sudo yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
#部署docker
sudo yum install docker-ce docker-ce-cli containerd.io
#启动docker
systemctl start docker
systemctl enable docker
systemctl status docker
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设置Docker镜像源和Cgroup驱动：
cat > /etc/docker/daemon.json << EOF
{
"registry-mirrors": ["https://aedvu1x8.mirror.aliyuncs.com"],
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2"
}
EOF
重启Docker，查看结果；
systemctl restart docker
docker info | grep Cgroup
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三、Haproxy 和 keepalived部署(三个主节点)
所有Master节点安装Haproxy、Keepalived；
yum -y install haproxy keepalived
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修改所有Master节点的配置文件:
cat > /etc/haproxy/haproxy.cfg << EOF
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
stats socket /var/lib/haproxy/stats
defaults
mode tcp
log global
option tcplog
option dontlognull
option redispatch
retries 3
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout check 10s
maxconn 3000
frontend k8s_https *:8443
mode tcp
maxconn 2000
default_backend https_sri
backend https_sri
balance roundrobin
server master-1-api 192.168.5.11:6443 check inter 10000 fall 2 rise 2 weight 1
server master-2-api 192.168.5.12:6443 check inter 10000 fall 2 rise 2 weight 1
server master-3-api 192.168.5.13:6443 check inter 10000 fall 2 rise 2 weight 1
EOF
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所有Master节点修改Keepalived配置文件： 注意按照规划修改priorty 值；
cat > /etc/keepalived/keepalived.conf << EOF
global_defs {
router_id LVS_DEVEL
}
vrrp_script check_haproxy {
script "/etc/keepalived/check_haproxy.sh"
interval 3000
}
vrrp_instance VI_1 {
state MASTER # 主机 MASTER 备机 BACKUP
interface ens33 # 修改网卡名
virtual_router_id 80
priority 100 #注意修改三个节点的值 100 80 70
advert_int 1
authentication {
auth_type PASS
auth_pass 111111
}
virtual_ipaddress {
192.168.5.50/24 #规划的vip地址
}
track_script {
check_haproxy
}
}
EOF
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SElinux一定要关闭，否则脚本无法运行
所有master节点上部署Haproxy监控脚本：
cat > /etc/keepalived/check_haproxy.sh << EOF
#!/bin/bash
if [ `ps -C haproxy --no-header | wc -l` == 0 ]; then
systemctl start haproxy
sleep 3
if [ `ps -C haproxy --no-header | wc -l` == 0 ]; then
systemctl stop keepalived
fi
fi
EOF
chmod +x /etc/keepalived/check_haproxy.sh
systemctl enable keepalived
systemctl restart keepalived
systemctl enable haproxy
systemctl restart haproxy
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四、ETCD集群部署(三个主节点)
创建etcd证书(master-1上执行即可)
1：设置cfssl环境
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl_linux-amd64
mv cfssl_linux-amd64 /usr/local/bin/cfssl
chmod +x cfssljson_linux-amd64
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
chmod +x cfssl-certinfo_linux-amd64
mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo
export PATH=/usr/local/bin:$PATH
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2：创建 CA 配置文件（下面配置的IP为etc节点的IP）
mkdir /root/ssl
cd /root/ssl
cat > ca-config.json <<EOF
{
"signing": {
"default": {
"expiry": "8760h"
},
"profiles": {
"kubernetes-Soulmate": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "8760h"
}
}
}
}
EOF
cat > ca-csr.json <<EOF
{
"CN": "kubernetes-Soulmate",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "shanghai",
"L": "shanghai",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -initca ca-csr.json | cfssljson -bare ca
cat > etcd-csr.json <<EOF
{
"CN": "etcd",
"hosts": [
"127.0.0.1",
"192.168.150.181",
"192.168.150.182",
"192.168.150.183"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "shanghai",
"L": "shanghai",
"O": "k8s",
"OU": "System"
}
]
}
EOF
cfssl gencert -ca=ca.pem \
-ca-key=ca-key.pem \
-config=ca-config.json \
-profile=kubernetes-Soulmate etcd-csr.json | cfssljson -bare etcd
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3:master-1分发etcd证书到master-2、master-3上面
mkdir -p /etc/etcd/ssl
cp etcd.pem etcd-key.pem ca.pem /etc/etcd/ssl/
ssh -n master-2 "mkdir -p /etc/etcd/ssl && exit"
ssh -n master-3 "mkdir -p /etc/etcd/ssl && exit"
scp -r /etc/etcd/ssl/*.pem master-2:/etc/etcd/ssl/
scp -r /etc/etcd/ssl/*.pem master-3:/etc/etcd/ssl/
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etcd集群部署
1、安装etcd
yum install etcd -y
mkdir -p /var/lib/etcd
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2、master-1的etcd.service
# cat <<EOF >/etc/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos
[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/bin/etcd \
--name master-1 \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem \
--peer-cert-file=/etc/etcd/ssl/etcd.pem \
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \
--trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \
--initial-advertise-peer-urls https://192.168.5.11:2380 \
--listen-peer-urls https://192.168.5.11:2380 \
--listen-client-urls https://192.168.5.11:2379,http://127.0.0.1:2379 \
--advertise-client-urls https://192.168.5.11:2379 \
--initial-cluster-token etcd-cluster-0 \
--initial-cluster master-1=https://192.168.5.11:2380,master-2=https://192.168.5.12:2380,master-3=https://192.168.5.13:2380 \
--initial-cluster-state new \
--data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
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3、master-2的etcd.service
# cat <<EOF >/etc/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos
[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/bin/etcd \
--name master-2 \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem \
--peer-cert-file=/etc/etcd/ssl/etcd.pem \
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \
--trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \
--initial-advertise-peer-urls https://192.168.5.12:2380 \
--listen-peer-urls https://192.168.5.12:2380 \
--listen-client-urls https://192.168.5.12:2379,http://127.0.0.1:2379 \
--advertise-client-urls https://192.168.5.12:2379 \
--initial-cluster-token etcd-cluster-0 \
--initial-cluster master-1=https://192.168.5.11:2380,master-2=https://192.168.5.12:2380,master-3=https://192.168.5.13:2380 \
--initial-cluster-state new \
--data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
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4、master-3的etcd.service
# cat <<EOF >/etc/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos
[Service]
Type=notify
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/bin/etcd \
--name master-3 \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem \
--peer-cert-file=/etc/etcd/ssl/etcd.pem \
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \
--trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \
--initial-advertise-peer-urls https://192.168.5.13:2380 \
--listen-peer-urls https://192.168.5.13:2380 \
--listen-client-urls https://192.168.5.13:2379,http://127.0.0.1:2379 \
--advertise-client-urls https://192.168.5.13:2379 \
--initial-cluster-token etcd-cluster-0 \
--initial-cluster master-1=https://192.168.5.11:2380,master-2=https://192.168.5.12:2380,master-3=https://192.168.5.13:2380 \
--initial-cluster-state new \
--data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
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5、添加自启动（etc集群最少2个节点才能启动，启动报错看mesages日志）
mv /etc/systemd/system/etcd.service /usr/lib/systemd/system/
systemctl daemon-reload
systemctl enable etcd
systemctl start etcd
systemctl status etcd
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6、创建etcd证书(master-1上执行即可)
etcdctl --endpoints=https://192.168.5.11:2379,https://192.168.5.12:2379,https://192.168.5.13:2379 \
--ca-file=/etc/etcd/ssl/ca.pem \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem cluster-health
member 45bf9ccad8d8900a is healthy: got healthy result from https://192.168.5.12:2379
member 54a5796a6803f252 is healthy: got healthy result from https://192.168.5.11:2379
member da27c13c21936c01 is healthy: got healthy result from https://192.168.5.13:2379
cluster is healthy
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四、Kubernetes集群部署（全部主机执行）
1、部署安装kubelet、kubeadm和kubectl
#添加kubernetes阿里源
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
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2、安装kubelet、kubeadm和kubectl：
yum -y install kubelet-1.22.1-0 kubeadm-1.22.1-0 kubectl-1.22.1-0
#启动kubelet，并设置自启动：
systemctl start kubelet
systemctl enable kubelet
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此时kubelet缺省配置文件无法启动，可忽略状态;
3、提前下载镜像(3台master主机上下载)：
#查看所需镜像
[root@master01 tools]# kubeadm config images list
I1213 22:07:58.020311 27601 version.go:255] remote version is much newer: v1.23.0; falling back to: stable-1.22
k8s.gcr.io/kube-apiserver:v1.22.1
k8s.gcr.io/kube-controller-manager:v1.22.1
k8s.gcr.io/kube-scheduler:v1.22.1
k8s.gcr.io/kube-proxy:v1.22.1
k8s.gcr.io/pause:3.5
k8s.gcr.io/etcd:3.5.0-0
k8s.gcr.io/coredns/coredns:v1.8.4
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下载脚本
#!/bin/bash
images="kube-apiserver:v1.22.1 kube-controller-manager:v1.22.1 kube-scheduler:v1.22.1 kube-proxy:v1.22.1 pause:3.5 etcd:3.5.0-0"
for imageName in ${images[@]};
do
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName
done
docker pull coredns/coredns:1.8.4
docker tag coredns/coredns:1.8.4 k8s.gcr.io/coredns/coredns:v1.8.4
docker rmi coredns/coredns:1.8.4
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在master节点保存镜像；
docker save -o kube-proxy.tar k8s.gcr.io/kube-proxy:v1.22.1
docker save -o coredns.tar k8s.gcr.io/coredns:v1.8.4
docker save -o pause.tar k8s.gcr.io/pause:3.5
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在worker节点上导入镜像：
docker load kube-proxy.tar k8s.gcr.io/kube-proxy:v1.22.1
docker load coredns.tar k8s.gcr.io/coredns:v1.8.4
docker load pause.tar k8s.gcr.io/pause:3.5
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4、初始化集群
使用kubeadm config print init-defaults > kubeadm-init.yaml 打印出默认配置，然后在根据自己的环境修改配置； 需要修改advertiseAddress、controlPlaneEndpoint、imageRepository、serviceSubnet；
[root@master01 tools]# cat kubeadm-init.yaml
apiVersion: kubeadm.k8s.io/v1beta3
bootstrapTokens:
- groups:
- system:bootstrappers:kubeadm:default-node-token
token: abcdef.0123456789abcdef
ttl: 24h0m0s
usages:
- signing
- authentication
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: 192.168.5.11 #本节点master-1 ip
bindPort: 6443
nodeRegistration:
criSocket: /var/run/dockershim.sock
imagePullPolicy: IfNotPresent
name: master-1
taints:
- effect: NoSchedule
key: node-role.kubernetes.io/master
---
apiServer:
timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta3
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
controlPlaneEndpoint: "192.168.5.50:8443" #VIP 地址 , haproxy对应端口8443
dns: {}
etcd:
external:
endpoints:
- https://192.168.5.11:2379
- https://192.168.5.12:2379
- https://192.168.5.13:2379
caFile: /etc/etcd/ssl/ca.pem
certFile: /etc/etcd/ssl/etcd.pem
keyFile: /etc/etcd/ssl/etcd-key.pem
imageRepository: k8s.gcr.io #镜像地址
kind: ClusterConfiguration
kubernetesVersion: 1.22.1 #版本,下载对应image 版本
networking:
dnsDomain: cluster.local
serviceSubnet: 10.96.0.0/12 #service 网段
podSubnet: 10.244.0.0/16
scheduler: {}
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初始化
kubeadm init --config kubeadm-init.yaml
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[root@master-1 ~]# kubeadm init --config kubeadm-init.yaml
[init] Using Kubernetes version: v1.22.1
[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 [kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local master-1] and IPs [10.96.0.1 192.168.5.11 192.168.5.50]
[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 [localhost master-1] and IPs [192.168.5.11 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [localhost master-1] and IPs [192.168.5.11 127.0.0.1 ::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"
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "admin.conf" kubeconfig file
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[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 16.576499 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.22" 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 master-1 as control-plane by adding the labels: [node-role.kubernetes.io/master(deprecated) node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]
[mark-control-plane] Marking the node master-1 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: abcdef.0123456789abcdef
[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
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[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/
You can now join any number of control-plane nodes by copying certificate authorities
and service account keys on each node and then running the following as root:
kubeadm join 192.168.5.50:8443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:83370f58a593b43539175844f4d8d895d4a2be4345ae76528e92b2ee52eaba1d \
--control-plane
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.5.50:8443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:83370f58a593b43539175844f4d8d895d4a2be4345ae76528e92b2ee52eaba1d
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kubeadm init主要执行了以下操作：
[init]：指定版本进行初始化操作
[preflight] ：初始化前的检查和下载所需要的 Docker 镜像文件
[kubelet-start] ：生成 kubelet 的配置文件 ”/var/lib/kubelet/config.yaml”，没有这个文件 kubelet 无法启动，所以初始化之前的 kubelet 实际上启动失败。
[certificates]：生成Kubernetes使用的证书，存放在 /etc/kubernetes/pki 目录中。
[kubeconfig] ：生成 KubeConfig 文件，存放在 /etc/kubernetes目录中，组件之间通信需要使用对应文件。
[control-plane]：使用 /etc/kubernetes/manifest 目录下的 YAML 文件，安装 Master 组件。
[etcd]：使用 /etc/kubernetes/manifest/etcd.yaml 安装 Etcd 服务。
[wait-control-plane]：等待 control-plan 部署的 Master 组件启动。
[apiclient]：检查 Master 组件服务状态。
[uploadconfig]：更新配置。
[kubelet]：使用 configMap 配置 kubelet。
[patchnode]：更新 CNI 信息到 Node上，通过注释的方式记录。
[mark-control-plane]：为当前节点打标签，打了角色 Master，和不可调度标签，这样默认就不会使用 Master 节点来运行 Pod。
[bootstrap-token]：生成 token 记录下来，后边使用 kubeadm join 往集群中添加节点时会用到。
[addons]：安装附加组件 CoreDNS 和 kube-proxy。
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为 kubectl 准备 Kubeconfig 文件；
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
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将证书分配至其它Master节点；
for node in master-2 master-3; do
ssh $node "mkdir -p /etc/kubernetes/pki/etcd; mkdir -p ~/.kube/"
scp /etc/kubernetes/pki/ca.crt $node:/etc/kubernetes/pki/ca.crt
scp /etc/kubernetes/pki/ca.key $node:/etc/kubernetes/pki/ca.key
scp /etc/kubernetes/pki/sa.key $node:/etc/kubernetes/pki/sa.key
scp /etc/kubernetes/pki/sa.pub $node:/etc/kubernetes/pki/sa.pub
scp /etc/kubernetes/pki/front-proxy-ca.crt $node:/etc/kubernetes/pki/front-proxy-ca.crt
scp /etc/kubernetes/pki/front-proxy-ca.key $node:/etc/kubernetes/pki/front-proxy-ca.key
scp /etc/kubernetes/pki/etcd/ca.crt $node:/etc/kubernetes/pki/etcd/ca.crt
scp /etc/kubernetes/pki/etcd/ca.key $node:/etc/kubernetes/pki/etcd/ca.key
scp /etc/kubernetes/admin.conf $node:/etc/kubernetes/admin.conf
scp /etc/kubernetes/admin.conf $node:~/.kube/config
done
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加入Master节点：
把master-2 master-3加入集群
[root@master-2 ~]# kubeadm join 192.168.5.50:8443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:83370f58a593b43539175844f4d8d895d4a2be4345ae76528e92b2ee52eaba1d \
--control-plane
[root@master-2 ~]# mkdir -p $HOME/.kube
[root@master-2 ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@master-2 ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config
======================================================================
[root@master-3 ~]# kubeadm join 192.168.5.50:8443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:83370f58a593b43539175844f4d8d895d4a2be4345ae76528e92b2ee52eaba1d \
--control-plane
[root@master-3 ~]# mkdir -p $HOME/.kube
[root@master-3 ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@master-3 ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config
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加入work节点：
[root@worker-1 ~]#kubeadm join 192.168.5.50:8443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:83370f58a593b43539175844f4d8d895d4a2be4345ae76528e92b2ee52eaba1d
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查看节点状态：
一开始没安装网络组件，是显示 notReady 的，装完 cailco 后就变成 Ready，说明集群已就绪了，可以进行下一步验证集群是否搭建成功。
[root@master-1 ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
master-1 Ready control-plane,master 117m v1.22.1
master-2 Ready control-plane,master 18m v1.22.1
master-3 Ready control-plane,master 16m v1.22.1
worker-1 Ready <none> 15m v1.22.1
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kube-proxy开启ipvs：
在任意Master节点上修改ConfigMap kube-proxy中的mode: “ipvs”：
kubectl edit configmap kube-proxy -n kube-system
添加这个
mode: "ipvs"
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在任意Master节点上重启各个节点上的kube-proxy pod：
kubectl get pod -n kube-system | grep kube-proxy | awk '{system("kubectl delete pod "$1" -n kube-system")}'
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验证修改：
[root@master-1 ~]# kubectl get pod -n kube-system | grep kube-proxy
kube-proxy-2fp75 1/1 Running 0 8s
kube-proxy-bshbw 1/1 Running 0 9s
kube-proxy-q7gpd 1/1 Running 0 11s
kube-proxy-qc7ct 1/1 Running 0 10s
[root@master-1 ~]# kubectl logs kube-proxy-2fp75 -n kube-system
I1214 06:15:16.767187 1 node.go:172] Successfully retrieved node IP: 192.168.5.11
I1214 06:15:16.767494 1 server_others.go:140] Detected node IP 192.168.5.11
I1214 06:15:16.800057 1 server_others.go:206] kube-proxy running in dual-stack mode, IPv4-primary
I1214 06:15:16.800120 1 server_others.go:274] Using ipvs Proxier.
I1214 06:15:16.800133 1 server_others.go:276] creating dualStackProxier for ipvs.
W1214 06:15:16.800149 1 server_others.go:495] detect-local-mode set to ClusterCIDR, but no IPv6 cluster CIDR defined, , defaulting to no-op detect-local for IPv6
E1214 06:15:16.800390 1 proxier.go:381] "can't set sysctl net/ipv4/vs/conn_reuse_mode, kernel version must be at least 4.1"
I1214 06:15:16.800881 1 proxier.go:440] "IPVS scheduler not specified, use rr by default"
E1214 06:15:16.801026 1 proxier.go:381] "can't set sysctl net/ipv4/vs/conn_reuse_mode, kernel version must be at least 4.1"
I1214 06:15:16.801356 1 proxier.go:440] "IPVS scheduler not specified, use rr by default"
W1214 06:15:16.801408 1 ipset.go:113] ipset name truncated; [KUBE-6-LOAD-BALANCER-SOURCE-CIDR] -> [KUBE-6-LOAD-BALANCER-SOURCE-CID]
W1214 06:15:16.801427 1 ipset.go:113] ipset name truncated; [KUBE-6-NODE-PORT-LOCAL-SCTP-HASH] -> [KUBE-6-NODE-PORT-LOCAL-SCTP-HAS]
I1214 06:15:16.801637 1 server.go:649] Version: v1.22.1
I1214 06:15:16.805136 1 conntrack.go:52] Setting nf_conntrack_max to 131072
I1214 06:15:16.806091 1 config.go:315] Starting service config controller
I1214 06:15:16.806124 1 shared_informer.go:240] Waiting for caches to sync for service config
I1214 06:15:16.806192 1 config.go:224] Starting endpoint slice config controller
I1214 06:15:16.806206 1 shared_informer.go:240] Waiting for caches to sync for endpoint slice config
I1214 06:15:16.907190 1 shared_informer.go:247] Caches are synced for endpoint slice config
I1214 06:15:16.907368 1 shared_informer.go:247] Caches are synced for service config
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日志中打印出了Using ipvs Proxier，说明ipvs模式已经开启。
五、安装CNI网络
官方链接：network addon
目前比较成熟的解决方案是：flannel + Calico, 即使用flannel来提供简单的网络管理功能，而使用Calico提供的网络策略功能。我们下面的插件任选一种，我用flannel配置。
安装Calico
wget https://docs.projectcalico.org/manifests/calico.yaml #下载calico.yaml文件
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所有master节点提前下载镜像：
[root@master01 tools]# cat calico.yaml |grep image
image: docker.io/calico/cni:v3.20.0
image: docker.io/calico/cni:v3.20.0
image: docker.io/calico/pod2daemon-flexvol:v3.20.0
image: docker.io/calico/node:v3.20.0
image: docker.io/calico/kube-controllers:v3.20.0
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部署CNI网络：
kubectl apply -f calico.yaml
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注意：calico.yaml中的CIDR需与初始化集群中的参数一致
安装flannel
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
kubectl create -f kube-flannel.yml
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安装完成后，coredns Pod 会自动running。 kubectl get node 节点会变成Ready状态。
在Virtualbox环境中，遇到coredns在Master之间可以解析，但是到Worker不能解析的情况。需要做如下修改
方法: 更改flannel daemonset的网卡eth1 ，我这里eth1用作集群内部的通信网卡
kubectl edit ds kube-flannel-ds -n kube-system
找到下面内容，添加 - --iface=eth1
containers:
- args:
- --ip-masq
- --kube-subnet-mgr
- --iface=eth1
command:
- /opt/bin/flanneld
name: kube-flannel
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六、测试集群
部署deployment service
通过deployment部署一个nginx
kubectl create deployment nginx-deploy --image=nginx:1.18
通过svc暴露服务
kubectl expose deployment nginx-deploy --name=nginx-svc --port=80 --target-port=80 --type=NodePort
查看
kubectl get deploy,pod,svc -o wide
访问worker节点IP
[root@master-1 ~]# curl 192.168.5.21:30647
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
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能显示出 Welcome to nginx，说明 pod 运行正常，间接也说明集群可以正常使用。
集群DNS测试
kubeadm默认已部署coredns
[root@master-1 ~]# kubectl get pod -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-6d8c4cb4d-dl2fv 1/1 Running 2 (44h ago) 46h
coredns-6d8c4cb4d-g4qhd 1/1 Running 2 (139m ago) 46h
创建一个busybox
[root@master-2 ~]# kubectl run busybox-ns-1 --rm -it --image=busybox:1.28.3 -- sh
If you don't see a command prompt, try pressing enter.
/ # nslookup kubernetes.default
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: kubernetes.default
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local
/ # nslookup nginx-svc
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: nginx-svc
Address 1: 10.104.211.32 nginx-svc.default.svc.cluster.local
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IPVS状态查看
[root@master01 tools]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.17.0.1:30009 rr
-> 172.18.241.65:8443 Masq 1 0 0
TCP 172.18.241.64:30009 rr
-> 172.18.241.65:8443 Masq 1 0 0
TCP 192.168.7.2:30009 rr
-> 172.18.241.65:8443 Masq 1 0 0
TCP 10.96.0.0:30009 rr
-> 172.18.241.65:8443 Masq 1 0 0
TCP 10.96.0.1:443 rr
-> 192.168.7.2:6443 Masq 1 0 0
-> 192.168.7.3:6443 Masq 1 0 0
-> 192.168.7.10:6443 Masq 1 0 0
TCP 10.96.0.10:53 rr
-> 172.16.241.65:53 Masq 1 0 0
-> 172.16.241.66:53 Masq 1 0 0
TCP 10.96.0.10:9153 rr
-> 172.16.241.65:9153 Masq 1 0 0
-> 172.16.241.66:9153 Masq 1 0 0
TCP 10.103.28.216:443 rr
-> 172.18.241.65:8443 Masq 1 0 0
TCP 10.107.116.120:8000 rr
-> 172.18.135.1:8000 Masq 1 0 0
UDP 10.96.0.10:53 rr
-> 172.16.241.65:53 Masq 1 0 0
-> 172.16.241.66:53 Masq 1 0 0
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七、kubernetes Dashboard UI
部署
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.2.0/aio/deploy/recommended.yaml
kubectl edit service kubernetes-dashboard -n kubernetes-dashboard
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kube-system
spec:
type: NodePort
ports:
- port: 443
targetPort: 8443
nodePort: 30000
selector:
k8s-app: kubernetes-dashboard
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获取token,通过令牌登陆
创建sa
kubectl create serviceaccount dashboard-admin -n kube-system
绑定role
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
查看token
kubectl -n kube-system describe secret $(kubectl -n kube-system get secret| awk '/dashboard-admin/{print $1}')
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通过firefox访问dashboard，输入token,即可登陆
https://192.168.5.12:30000/#!/login
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登录界面
如果要重新部署:
kubeadm reset
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