1. 基础环境配置
1.1 配置信息
系统版本 centOS7.9
docker版本 20.10.11
kubernetes v1.20.13
Pod网段 10.244.0.0/16
service网段 10.96.0.0/16
1.2 所有节点修改/etc/hosts
cat <<EOF | sudo tee /etc/hosts
10.10.10.2 app1 #master
10.10.10.3 app2 #master
10.10.10.4 app3 #master
10.10.10.5 app4
10.10.10.6 db1
10.10.10.7 db2
EOF
1.3 配置yum源
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager –add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sed -i ‘s+download.docker.com+mirrors.aliyun.com/docker-ce+’ /etc/yum.repos.d/docker-ce.repo
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
1.4 必备工具安装
yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git -y
1
1.5 所有节点关闭firewalld、selinux、swap
systemctl disable –now firewalld
swapoff -a && sysctl -w vm.swappiness=0
sed -ri ‘/^[^#]*swap/s@^@#@’ /etc/fstab
setenforce 0
sed -i ‘s#SELINUX=enforcing#SELINUX=disabled#g’ /etc/sysconfig/selinux
sed -i ‘s#SELINUX=enforcing#SELINUX=disabled#g’ /etc/selinux/config
1.6 所有节点设置时间同步
yum install ntpdate -y
ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo ‘Asia/Shanghai’ >/etc/timezone
ntpdate ntp.aliyun.com
*/5 * * * * /usr/sbin/ntpdate ntp.aliyun.com # 加入到crontab
1.7 所有节点配置limit
ulimit -SHn 65535
cat <<EOF | sudo tee /etc/security/limits.conf # 末尾添加如下内容
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
EOF
1.8 app1配置ssh免密登录其他节点
ssh-keygen -t rsa
for i in app1 app2 app3 app4 db1 db2;do ssh-copy-id -i .ssh/id_rsa.pub $i;done
1.9 所有节点升级
yum update -y –exclude=kernel* && reboot
1.10 所有节点安装ipvsadm
yum install ipvsadm ipset sysstat conntrack libseccomp -y
modprobe — ip_vs
modprobe — ip_vs_rr
modprobe — ip_vs_wrr
modprobe — ip_vs_sh
modprobe — nf_conntrack
cat <<EOF | sudo tee /etc/modules-load.d/ipvs.conf
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
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF
systemctl enable –now systemd-modules-load.service
1.11 所有开启k8s必须的内核参数
cat <<EOF > /etc/sysctl.d/k8s.conf
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.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
EOF
sysctl –system
reboot
lsmod | grep –color=auto -e ip_vs -e nf_conntrack # 重启后查看内核参数
2. 基本组件安装
2.1 安装docker-ce
yum list docker-ce –showduplicates | sort -r
yum install docker-ce docker-ce-cli -y
cat > /etc/docker/daemon.json <<EOF
{
“exec-opts”: [“native.cgroupdriver=systemd”],
“registry-mirrors”: [“https://registry.docker-cn.com”,”https://rsbud4vc.mirror.aliyuncs.com”,”https://docker.mirrors.ustc.edu.cn”,”https://dockerhub.azk8s.cn”,”http://hub-mirror.c.163.com”,”http://qtid6917.mirror.aliyuncs.com”, “https://rncxm540.mirror.aliyuncs.com”],
“storage-driver”: “overlay2”,
“log-driver”: “json-file”,
“log-opts”: {
“max-size”: “10m”,
“max-file”: “10”
}
}
EOF
systemctl daemon-reload && systemctl enable –now docker # 所有节点设置开机自启动
2.2 安装kubeadm、kubelet、kubectl
yum list kubeadm.x86_64 –showduplicates | sort -r
yum install -y kubelet-1.20.13 kubeadm-1.20.13 kubectl-1.20.13
cat >/etc/sysconfig/kubelet<<EOF # 修改pause的镜像仓库
KUBELET_EXTRA_ARGS=”–cgroup-driver=systemd –pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.2″
EOF
systemctl daemon-reload
systemctl enable –now kubelet
2.3 master节点安装高可用组件
yum install keepalived nginx -y
# 所有master节点都设置,将原内容换成下面的内容
cat > /etc/nginx/nginx.conf << EOF
user root;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;
events {
worker_connections 1024;
}
stream {
log_format main ‘$remote_addr $upstream_addr – [$time_local] $status $upstream_bytes_sent’;
access_log /var/log/nginx/k8s-access.log main;
upstream k8s-apiserver {
server 10.10.10.2:6443;
server 10.10.10.3:6443;
server 10.10.10.4:6443;
}
server {
listen 16443;
proxy_pass k8s-apiserver;
}
upstream web-443 {
server 10.10.10.2:9443;
server 10.10.10.3:9443;
server 10.10.10.4:9443;
}
server {
listen 443;
proxy_pass web-443;
}
upstream web-80 {
server 10.10.10.2:8080;
server 10.10.10.3:8080;
server 10.10.10.4:8080;
}
server {
listen 80;
proxy_pass web-80;
}
}
http {
log_format main ‘$remote_addr – $remote_user [$time_local] “$request” ‘
‘$status $body_bytes_sent “$http_referer” ‘
‘”$http_user_agent” “$http_x_forwarded_for”‘;
access_log /var/log/nginx/access.log main;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 4096;
proxy_http_version 1.1;
include /etc/nginx/mime.types;
default_type application/octet-stream;
include /etc/nginx/conf.d/*.conf;
}
EOF
# app1节点配置
cat /etc/keepalived/keepalived.conf
global_defs {
router_id huangshan
script_user root
enable_script_security
}
vrrp_script check_app {
script “/etc/keepalived/check_nginx.sh”
}
vrrp_instance VI_1 {
state MASTER
interface ens2f0
virtual_router_id 50
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
check_nginx
}
virtual_ipaddress {
10.10.10.99
}
}
# app2节点配置
# cat /etc/keepalived/keepalived.conf
global_defs {
router_id huangshan
script_user root
enable_script_security
}
vrrp_script check_nginx {
script “/etc/keepalived/check_nginx.sh”
}
vrrp_instance VI_1 {
state BACKUP1
interface ens1f0
virtual_router_id 50
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
check_nginx
}
virtual_ipaddress {
10.10.10.99
}
}
# app3节点配置，将原内容换成下面的内容
cat /etc/keepalived/keepalived.conf
global_defs {
router_id huangshan
script_user root
enable_script_security
}
vrrp_script check_nginx {
script “/etc/keepalived/check_nginx.sh”
}
vrrp_instance VI_1 {
state BACKUP2
interface ens2f0
virtual_router_id 50
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
check_nginx
}
virtual_ipaddress {
10.10.10.99
}
}
# 所有master节点配置KeepAlived健康检查文件
cat /etc/keepalived/check_nginx.sh
#!/bin/bash
count=$(ps -ef |grep nginx | grep sbin | egrep -cv “grep|$$”)
if [ “$count” -eq 0 ];then
systemctl stop keepalived
fi
systemctl daemon-reload
systemctl enable –now nginx
systemctl enable –now keepalived
3. 集群初始化
3.1 初始化
cat kubeadm-config.yaml
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v1.20.13
controlPlaneEndpoint: 10.10.10.99:16443
imageRepository: registry.aliyuncs.com/google_containers
apiServer:
certSANs:
– 10.10.10.2
– 10.10.10.3
– 10.10.10.4
– 10.10.10.5
– 10.10.10.6
– 10.10.10.7
– 10.10.10.99
networking:
podSubnet: 10.244.0.0/16
serviceSubnet: 10.96.0.0/16
—
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: ipvs
拉取kubeadm 99年证书版本
wget https://v.vimll.com:9999/download/kubeadm-v.1.20.13-99years
mv /usr/bin/kubeadm /usr/bin/kubeadm.bak ;
cp kubeadm-v.1.20.13-99years /usr/bin/kubeadm ;chmod +x /usr/bin/kubeadm
kubeadm config migrate –old-config kubeadm-config.yaml –new-config new.yaml # 更新kubeadm文件
kubeadm config images pull –config /root/new.yaml # 先下载镜像
systemctl enable –now kubelet
kubeadm init –config /root/new.yaml –upload-certs # 初始化
# 初始化成功后执行，master节点才能使用kubectl
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config
# kubectl命令补全
yum -y install bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo “source <(kubectl completion bash)” >> ~/.bashrc
kubeadm reset -f ; ipvsadm –clear ; rm -rf ~/.kube # 如果初始化失败，重置后再次初始化
3.2 添加新的master节点和node节点
# 添加master节点
kubeadm join 10.10.10.99:16443 –token zbla21.jj0pfuz91vuvx7qc –discovery-token-ca-cert-hash sha256:fe9058e1a39b0d3ac8212c79f907830b171d695856e67c1892d8e97da0b83f1b \
–control-plane –certificate-key 501b00ce18f97884656fbc3b16224dcf4ae01520d16d6e6c05732169c47f14ea
# 添加node节点
kubeadm join 10.10.10.99:16443 –token zbla21.jj0pfuz91vuvx7qc –discovery-token-ca-cert-hash sha256:fe9058e1a39b0d3ac8212c79f907830b171d695856e67c1892d8e97da0b83f1b
kubeadm token create –print-join-command # 如果token过期，生成新token
kubeadm init phase upload-certs –upload-certs # Master需要生成–certificate-key
3.3 app1安装calico组件（这一部分内容需一行一行复制，不然容易出错）
kubectl apply -f https://v.vimll.com:9999/download/hs/calico.yaml