基本环境配置

机器名

IP地址

说明

k8s-master01-03

192.168.3.33-35

master节点✖️3

VIP

192.68.3.236

keepalived虚拟IP

k8s-node01

192.168.3.36-37

node节点✖️2

未说明操作哪台服务器即操作所有。

编辑/etc/hosts

192.168.3.33    k8s-master01
192.168.3.34    k8s-master02
192.168.3.35    k8s-master03
192.168.3.36    k8s-node01
192.168.3.37    k8s-node02

设置YUM源及DOCKER源

curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-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

安装常用工具

yum install -y wget jq psmisc vim net-tools telnet git

关闭防火墙 SELinux DNSmasq

systemctl disable --now firewalld
systemctl disable --now dnsmasq #这里提示没有相关文件
systemctl disable --now NetworkManager

setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config

swapoff -a && sysctl -w vm.swappiness=0
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab

NTPDATE

yum install -y ntpdate
echo 'Asia/Shanghai' >/etc/timezone

ntpdate time2.aliyun.com

crontab -e
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com

配置limit

vim /etc/security/limits.conf
* soft nofile 65536
* hard nofile 131072
* soft nproc 65536
* hard nproc 655360
* soft memlock unlimited
* hard memlock unlimited

配置免登录

操作服务器：k8s-master01

ssh-keygen -t rsa
for i in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02;do ssh-copy-id -i .ssh/id_rsa.pub $i;done

下载安装所需源码

操作服务器：k8s-master01

git clone https://gitee.com/dukuan/k8s-ha-install.git

升级系统并重启

yum update -y && reboot

内核配置

下载离线升级包

操作服务器：k8s-master01

wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm

for i in k8s-master02 k8s-master03 k8s-node01 k8s-node02;do scp kernel* $i:`pwd`;done

所有节点升级

yum localinstall -y kernel-ml*
#更改内核启动顺序性
grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg 
grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"
#检查内核是否是4.19版本
grubby --default-kernel
/boot/vmlinuz-4.19.12-1.el7.elrepo.x86_64

重启服务器并再次检查

uname -a
Linux k8s-master01 4.19.12-1.el7.elrepo.x86_64 #1 SMP Fri Dec 21 11:06:36 EST 2018 x86_64 x86_64 x86_64 GNU/Linux

安装ipvsadm ipset

yum install -y ipvsadm ipset sysstat conntrack libseccomp

配置ipvs模块

vim /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

执行以下命令

systemctl enable --now systemd-modules-load.service

k8s内核参数

vim /etc/sysctl.d/k8s.conf

net.ipv4.ip_forward = 1
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
net.ipv4.conf.all.route_localnet = 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
sysctl --system

reboot
lsmod |grep --color=auto -e ip_vs -e nf_conntrack

基本组件安装

安装DOCKER

yum install -y docker-ce-20.10.* docker-ce-cli-20.10.* docker-compose
mkdir /etc/docker
vim /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"]
}
mkdir -p /data/k8s/docker/ /data/k8s/kubelet/
ln -s /data/k8s/docker/ /var/lib/docker
ln -s /data/k8s/kubelet/ /var/lib/kubelet
systemctl daemon-reload && systemctl enable --now docker

k8s Etcd 安装

操作服务器：k8s-master01

wget https://storage.googleapis.com/kubernetes-release/release/v1.22.16/kubernetes-server-linux-amd64.tar.gz
wget https://github.com/etcd-io/etcd/releases/download/v3.5.5/etcd-v3.5.5-linux-amd64.tar.gz

tar -xf kubernetes-server-linux-amd64.tar.gz  --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy}
tar -zxvf etcd-v3.5.5-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.5-linux-amd64/etcd{,ctl}

查看版本

操作服务器：k8s-master01

[root@k8s-master01 tools]# kubelet --version
Kubernetes v1.22.16
[root@k8s-master01 tools]# etcdctl version
etcdctl version: 3.5.5
API version: 3.5

将组件发送至其他k8s节点

操作服务器：k8s-master01

Master='k8s-master02 k8s-master03'
Work='k8s-node01 k8s-node02'

for NODE in $Master; do echo $NODE; scp /usr/local/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} $NODE:/usr/local/bin/; scp /usr/local/bin/etcd* $NODE:/usr/local/bin/; done

for NODE in $Work; do scp /usr/local/bin/kube{let,-proxy} $NODE:/usr/local/bin/; done

mkdir -p /opt/cni/bin #所有节点操作
cd k8s-ha-install/
git checkout manual-installation-v1.22.x

生成证书

wget "https://pkg.cfssl.org/R1.2/cfssl_linux-amd64" -O /usr/local/bin/cfssl
wget "https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64" -O /usr/local/bin/cfssljson
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson

Etcd证书

#所有Master节点
mkdir /etc/etcd/ssl -p
#所有节点
mkdir /etc/kubernetes/pki -p

cd /root/tools/k8s-ha-install/pki
cfssl gencert -initca etcd-ca-csr.json |cfssljson -bare /etc/etcd/ssl/etcd-ca

cfssl gencert \
-ca=/etc/etcd/ssl/etcd-ca.pem \
-ca-key=/etc/etcd/ssl/etcd-ca-key.pem \
-config=ca-config.json \
-hostname=127.0.0.1,k8s-master01,k8s-master02,k8s-master03,192.168.3.33,192.168.3.34,192.168.3.35 \
-profile=kubernetes \
etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd

cd /etc/etcd/ssl/
scp *.pem k8s-master02:`pwd`
scp *.pem k8s-master03:`pwd`

K8s证书

cfssl gencert -initca ca-csr.json |cfssljson -bare /etc/kubernetes/pki/ca

cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem -config=ca-config.json \
-hostname=192.168.0.1,192.168.3.236,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.3.33,192.168.3.34,192.168.3.35 \
-profile=kubernetes apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver

cfssl gencert -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca

cfssl gencert -ca=/etc/kubernetes/pki/front-proxy-ca.pem -ca-key=/etc/kubernetes/pki/front-proxy-ca-key.pem -config=ca-config.json -profile=kubernetes front-proxy-client-csr.json |cfssljson -bare /etc/kubernetes/pki/front-proxy-client

cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
manager-csr.json |cfssljson -bare /etc/kubernetes/pki/controller-manager

kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.3.236:6443 \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

kubectl config set-context system:kube-controller-manager@kubernetes \
--cluster=kubernetes \
--user=system:kube-controller-manager \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

kubectl config set-credentials system:kube-controller-manager \
--client-certificate=/etc/kubernetes/pki/controller-manager.pem \
--client-key=/etc/kubernetes/pki/controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

kubectl config use-context system:kube-controller-manager@kubernetes \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
scheduler-csr.json | cfssljson -bare /etc/kubernetes/pki/scheduler

kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.3.236:6443 \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig

kubectl config set-credentials system:kube-scheduler \
--client-certificate=/etc/kubernetes/pki/scheduler.pem \
--client-key=/etc/kubernetes/pki/scheduler-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig

kubectl config set-context system:kube-scheduler@kubernetes \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig

kubectl config use-context system:kube-scheduler@kubernetes \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig


cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-profile=kubernetes \
admin-csr.json | cfssljson -bare /etc/kubernetes/pki/admin

kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.3.236:6443 \
--kubeconfig=/etc/kubernetes/admin.kubeconfig

kubectl config set-credentials kubernetes-admin \
--client-certificate=/etc/kubernetes/pki/admin.pem \
--client-key=/etc/kubernetes/pki/admin-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/admin.kubeconfig

kubectl config set-context kubernetes-admin@kubernetes --cluster=kubernetes --user=kubernetes-admin --kubeconfig=/etc/kubernetes/admin.kubeconfig

kubectl config use-context kubernetes-admin@kubernetes --kubeconfig=/etc/kubernetes/admin.kubeconfig
 
openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub

for NODE in k8s-master02 k8s-master03; do for FILE in $(ls /etc/kubernetes/pki | grep -v etcd); do scp /etc/kubernetes/pki/${FILE} $NODE:/etc/kubernetes/pki/${FILE}; done; for FILE in admin.kubeconfig controller-manager.kubeconfig scheduler.kubeconfig; do scp /etc/kubernetes/${FILE} $NODE:/etc/kubernetes/${FILE}; done; done

高可用配置

所有Master节点操作

yum -y install keepalived haproxy

所有MASTER配置

vim /etc/haproxy/haproxy.cfg
global
  maxconn  2000
  ulimit-n  16384
  log  127.0.0.1 local0 err
  stats timeout 30s

defaults
  log global
  mode  http
  option  httplog
  timeout connect 5000
  timeout client  50000
  timeout server  50000
  timeout http-request 15s
  timeout http-keep-alive 15s

frontend monitor-in
  bind *:33305
  mode http
  option httplog
  monitor-uri /monitor

frontend k8s-master
  bind 0.0.0.0:16443 # 监听的端口
  bind 127.0.0.1:16443
  mode tcp
  option tcplog
  tcp-request inspect-delay 5s
  default_backend k8s-master

backend k8s-master
  mode tcp
  option tcplog
  option tcp-check
  balance roundrobin
  default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
  server k8s-master01   192.168.3.33:6443  check # 配置后端服务器地址
  server k8s-master02   192.168.3.34:6443  check
  server k8s-master03   192.168.3.35:6443  check

Master01节点配置

vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5
    weight -5
    fall 2
    rise 1
}
vrrp_instance VI_1 {
    state MASTER
    interface eth0 # 本机网卡名称
    mcast_src_ip 192.168.3.33 # 本机IP地址
    virtual_router_id 51
    priority 101
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.3.236 # VIP地址，需要是宿主机同网段且不存在的IP地址
    }
    track_script {
       chk_apiserver
    }
}

Master02节点配置

vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5
    weight -5
    fall 2
    rise 1
}
vrrp_instance VI_1 {
    state BACKUP
    interface  eth0
    mcast_src_ip 192.168.3.34
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.3.236
    }
    track_script {
       chk_apiserver
    }
}

Master03节点配置

vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5
    weight -5
    fall 2
    rise 1
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    mcast_src_ip 192.168.3.35
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.3.236
    }
    track_script {
       chk_apiserver
    }
}

所有MASTER配置

vim /etc/keepalived/check_apiserver.sh
#!/bin/bash

err=0
for k in $(seq 1 3)
do
    check_code=$(pgrep haproxy)
    if [[ $check_code == "" ]]; then
        err=$(expr $err + 1)
        sleep 1
        continue
    else
        err=0
        break
    fi
done

if [[ $err != "0" ]]; then
    echo "systemctl stop keepalived"
    /usr/bin/systemctl stop keepalived
    exit 1
else
    exit 0
fi

chmod +x /etc/keepalived/check_apiserver.sh

启动HAProxy KeepAlived

systemctl daemon-reload
systemctl enable --now haproxy
systemctl enable --now keepalived

ping 192.168.3.236

Etcd集群配置

配置文件 所有MASTER配置

vim /etc/etcd/etcd.config.yml
name: 'k8s-master01'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.3.33:2380'
listen-client-urls: 'https://192.168.3.33:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.3.33:2380'
advertise-client-urls: 'https://192.168.3.33:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.3.33:2380,k8s-master02=https://192.168.3.34:2380,k8s-master03=https://192.168.3.35:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false

创建Service 所有MASTER配置

vim /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target

[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
Alias=etcd3.service

创建Etcd证书目录

mkdir /etc/kubernetes/pki/etcd
ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
systemctl daemon-reload
systemctl enable --now etcd
systemctl status etcd

查看Etcd集群状态

export ETCDCTL_API=3
etcdctl --endpoints="192.168.3.33:2379,192.168.3.34:2379,192.168.3.35:2379" --cacert=/etc/kubernetes/pki/etcd/etcd-ca.pem --cert=/etc/kubernetes/pki/etcd/etcd.pem --key=/etc/kubernetes/pki/etcd/etcd-key.pem  endpoint status --write-out=table

K8s Master 节点配置

mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes

APIServer

vim /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --insecure-port=0  \
      --advertise-address=192.168.3.33 \
      --service-cluster-ip-range=192.168.0.0/16  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://192.168.3.33:2379,https://192.168.3.34:2379,https://192.168.3.35:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --service-account-signing-key-file=/etc/kubernetes/pki/sa.key  \
      --service-account-issuer=https://kubernetes.default.svc.cluster.local \
      --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname  \
      --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota  \
      --authorization-mode=Node,RBAC  \
      --enable-bootstrap-token-auth=true  \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem  \
      --requestheader-allowed-names=aggregator  \
      --requestheader-group-headers=X-Remote-Group  \
      --requestheader-extra-headers-prefix=X-Remote-Extra-  \
      --requestheader-username-headers=X-Remote-User
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target

systemctl daemon-reload && systemctl enable --now kube-apiserver
systemctl status kube-apiserver

Controller Manager

vim /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-controller-manager \
      --v=2 \
      --logtostderr=true \
      --address=127.0.0.1 \
      --root-ca-file=/etc/kubernetes/pki/ca.pem \
      --cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem \
      --cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem \
      --service-account-private-key-file=/etc/kubernetes/pki/sa.key \
      --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \
      --leader-elect=true \
      --use-service-account-credentials=true \
      --node-monitor-grace-period=40s \
      --node-monitor-period=5s \
      --pod-eviction-timeout=2m0s \
      --controllers=*,bootstrapsigner,tokencleaner \
      --allocate-node-cidrs=true \
      --cluster-cidr=172.16.0.0/12 \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
      --node-cidr-mask-size=24
      
Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target

systemctl daemon-reload
systemctl enable --now kube-controller-manager
systemctl status kube-controller-manager

Scheduler

vim /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-scheduler \
      --v=2 \
      --logtostderr=true \
      --address=127.0.0.1 \
      --leader-elect=true \
      --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target

systemctl daemon-reload
systemctl enable --now kube-scheduler
systemctl status kube-scheduler

TLS Bootstrapping 配置

在master01上配置

cd tools/k8s-ha-install/

kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true     --server=https://192.168.3.236:6443 \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

kubectl config set-credentials tls-bootstrap-token-user \
--token=c8ad9c.2e4d610cf3e7426e \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

kubectl config set-context tls-bootstrap-token-user@kubernetes \
--cluster=kubernetes \
--user=tls-bootstrap-token-user \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

kubectl config use-context tls-bootstrap-token-user@kubernetes \
--kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

mkdir -p /root/.kube ; cp /etc/kubernetes/admin.kubeconfig /root/.kube/config

# 查看集群状态，没问题的话继续后续操作
kubectl get cs

Warning: v1 ComponentStatus is deprecated in v1.19+
NAME                 STATUS    MESSAGE                         ERROR
controller-manager   Healthy   ok                              
scheduler            Healthy   ok                              
etcd-0               Healthy   {"health":"true","reason":""}   
etcd-2               Healthy   {"health":"true","reason":""}   
etcd-1               Healthy   {"health":"true","reason":""}   

kubectl create -f bootstrap/bootstrap.secret.yaml

NODE节点配置

在master01上将证书复制到node节点

cd /etc/kubernetes/
for NODE in k8s-master02 k8s-master03 k8s-node01 k8s-node02; do for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig; do scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE}; done; done

Kubelet配置

mkdir -p /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/
vim /usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service

[Service]
ExecStart=/usr/local/bin/kubelet

Restart=always
StartLimitInterval=0
RestartSec=10

[Install]
WantedBy=multi-user.target

vim /etc/systemd/system/kubelet.service.d/10-kubelet.conf
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig"
Environment="KUBELET_SYSTEM_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin"
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.5"
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node='' "
ExecStart=
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS

vim /etc/kubernetes/kubelet-conf.yml

apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 192.168.0.10
clusterDomain: cluster.local
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s

systemctl daemon-reload
systemctl enable --now kubelet
kubectl get node

kube-proxy配置

kubectl -n kube-system create serviceaccount kube-proxy
kubectl create clusterrolebinding system:kube-proxy --clusterrole system:node-proxier --serviceaccount kube-system:kube-proxy
SECRET=$(kubectl -n kube-system get sa/kube-proxy --output=jsonpath='{.secrets[0].name}')
JWT_TOKEN=$(kubectl -n kube-system get secret/$SECRET --output=jsonpath='{.data.token}' | base64 -d)

kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.3.236:6443 --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig

kubectl config set-credentials kubernetes --token=${JWT_TOKEN} --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config set-context kubernetes --cluster=kubernetes --user=kubernetes --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config use-context kubernetes --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig

scp /etc/kubernetes/kube-proxy.kubeconfig k8s-master02:/etc/kubernetes/
scp /etc/kubernetes/kube-proxy.kubeconfig k8s-master03:/etc/kubernetes/
scp /etc/kubernetes/kube-proxy.kubeconfig k8s-node01:/etc/kubernetes/
scp /etc/kubernetes/kube-proxy.kubeconfig k8s-node02:/etc/kubernetes/

vim /usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-proxy \
  --config=/etc/kubernetes/kube-proxy.yaml \
  --v=2

Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target

vim /etc/kubernetes/kube-proxy.yaml
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
clientConnection:
  acceptContentTypes: ""
  burst: 10
  contentType: application/vnd.kubernetes.protobuf
  kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
  qps: 5
clusterCIDR: 172.16.0.0/12 
configSyncPeriod: 15m0s
conntrack:
  max: null
  maxPerCore: 32768
  min: 131072
  tcpCloseWaitTimeout: 1h0m0s
  tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
  masqueradeAll: false
  masqueradeBit: 14
  minSyncPeriod: 0s
  syncPeriod: 30s
ipvs:
  masqueradeAll: true
  minSyncPeriod: 5s
  scheduler: "rr"
  syncPeriod: 30s
kind: KubeProxyConfiguration
metricsBindAddress: 127.0.0.1:10249
mode: "ipvs"
nodePortAddresses: null
oomScoreAdj: -999
portRange: ""
udpIdleTimeout: 250ms

systemctl daemon-reload
systemctl enable --now kube-proxy
systemctl status kube-proxy

安装Calico

cd /root/tools/k8s-ha-install/calico
sed -i "s#POD_CIDR#172.16.0.0/12#g" calico.yaml 
kubectl apply -f calico.yaml 
kubectl get po -n kube-system

安装CoreDNS

cd /root/tools/k8s-ha-install/CoreDNS
COREDNS_SERVICE_IP=`kubectl get svc | grep kubernetes | awk '{print $3}'`0
sed -i "s#192.168.0.10#${COREDNS_SERVICE_IP}#g" coredns.yaml 
kubectl create -f coredns.yaml

安装Metrics Server

cd /root/tools/k8s-ha-install/metrics-server
kubectl create -f .
kubectl get po -n kube-system -l k8s-app=metrics-server
kubectl top node
kubectl top po -A

安装Dashboard

cd /root/tools/k8s-ha-install/dashboard
#将seccomp.security.alpha.kubernetes.io/pod替换为seccompProfile
kubectl create -f .
kubectl get svc kubernetes-dashboard -n kubernetes-dashboard

使用firefox访问：https://192.168.3.33:30770/

查看token

kubectl -n kube-system get secret | grep admin-user | awk '{print $1}'
kubectl -n kube-system describe secret admin-user-token-6d4s2