二进制安装Kubernetes（k8s） v1.23.3 ---（上）

小陈运维 • 2023-01-02 • 云技术社区 • 284 阅读

1.环境

主机名称

IP地址

说明

软件

Master01

10.0.0.21

master节点

kube-apiserver、kube-controller-manager、kube-scheduler、etcd、
kubelet、kube-proxy、nfs-client

Master02

10.0.0.22

master节点

kube-apiserver、kube-controller-manager、kube-scheduler、etcd、
kubelet、kube-proxy、nfs-client

Master03

10.0.0.23

master节点

kube-apiserver、kube-controller-manager、kube-scheduler、etcd、
kubelet、kube-proxy、nfs-client

Node01

10.0.0.24

node节点

kubelet、kube-proxy、nfs-client

Node02

10.0.0.25

node节点

kubelet、kube-proxy、nfs-client

Lb01

192.168.1.76

Lb01节点

haproxy、keepalived

Lb02

192.168.1.77

Lb02节点

haproxy、keepalived

192.168.1.78

VIP

软件

版本

内核

5.16.7-1.el8.elrepo.x86_64

CentOS 8

v8

kube-apiserver、kube-controller-manager、kube-scheduler、kubelet、kube-proxy

v1.23.3

etcd

v3.5.2

docker-ce

v20.10.9

containerd

v1.6.0

cfssl

v1.6.1

cni

v1.6.0

crictl

v1.23.0

haproxy

v1.8.27

keepalived

v2.1.5

网段

物理主机：192.168.1.0/24

service：10.96.0.0/12

pod：172.16.0.0/12

如果有条件建议k8s集群与etcd集群分开安装

1.1.k8s基础系统环境配置

1.2.配置IP

ssh root@192.168.1.100 "nmcli con mod ens18 ipv4.addresses 192.168.1.76/24; nmcli con mod ens18 ipv4.gateway 192.168.1.99; nmcli con mod ens18 ipv4.method manual; nmcli con mod ens18 ipv4.dns "8.8.8.8"; nmcli con up ens18"
ssh root@192.168.1.125 "nmcli con mod ens18 ipv4.addresses 192.168.1.77/24; nmcli con mod ens18 ipv4.gateway 192.168.1.99; nmcli con mod ens18 ipv4.method manual; nmcli con mod ens18 ipv4.dns "8.8.8.8"; nmcli con up ens18"
ssh root@192.168.1.116 "nmcli con mod ens18 ipv4.addresses 192.168.1.78/24; nmcli con mod ens18 ipv4.gateway 192.168.1.99; nmcli con mod ens18 ipv4.method manual; nmcli con mod ens18 ipv4.dns "8.8.8.8"; nmcli con up ens18"
ssh root@192.168.1.108 "nmcli con mod ens18 ipv4.addresses 192.168.1.79/24; nmcli con mod ens18 ipv4.gateway 192.168.1.99; nmcli con mod ens18 ipv4.method manual; nmcli con mod ens18 ipv4.dns "8.8.8.8"; nmcli con up ens18"
ssh root@192.168.1.106 "nmcli con mod ens18 ipv4.addresses 192.168.1.80/24; nmcli con mod ens18 ipv4.gateway 192.168.1.99; nmcli con mod ens18 ipv4.method manual; nmcli con mod ens18 ipv4.dns "8.8.8.8"; nmcli con up ens18"
ssh root@192.168.1.154 "nmcli con mod ens18 ipv4.addresses 192.168.1.86/24; nmcli con mod ens18 ipv4.gateway 192.168.1.99; nmcli con mod ens18 ipv4.method manual; nmcli con mod ens18 ipv4.dns "8.8.8.8"; nmcli con up ens18"
ssh root@192.168.1.161 "nmcli con mod ens18 ipv4.addresses 192.168.1.87/24; nmcli con mod ens18 ipv4.gateway 192.168.1.99; nmcli con mod ens18 ipv4.method manual; nmcli con mod ens18 ipv4.dns "8.8.8.8"; nmcli con up ens18"

1.3.设置主机名

hostnamectl set-hostname k8s-master01
hostnamectl set-hostname k8s-master02
hostnamectl set-hostname k8s-master03
hostnamectl set-hostname k8s-node01
hostnamectl set-hostname k8s-node02
hostnamectl set-hostname lb01
hostnamectl set-hostname lb02

1.4.配置yum源

sudo sed -e 's|^mirrorlist=|#mirrorlist=|g' \\
         -e 's|^#baseurl=http://mirror.centos.org/$contentdir|baseurl=http://192.168.1.123/centos|g' \\
         -i.bak \\
         /etc/yum.repos.d/CentOS-*.repo
​

1.5.安装一些必备工具 

yum -y install wget jq psmisc vim net-tools  telnet yum-utils device-mapper-persistent-data lvm2 git network-scripts tar curl -y

1.6.安装docker工具 

curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun

1.7.关闭防火墙 

systemctl disable --now firewalld

1.8.关闭SELinux 

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

1.9.关闭交换分区 

sed -ri 's/.*swap.*/#&/' /etc/fstab
swapoff -a && sysctl -w vm.swappiness=0
cat /etc/fstab
​
# /dev/mapper/centos-swap swap                    swap    defaults        0 0

1.10.关闭NetworkManager 并启用 network

systemctl disable --now NetworkManager
systemctl start network && systemctl enable network

1.11.进行时间同步

服务端
​
yum install chrony -y
vim /etc/chrony.conf
cat /etc/chrony.conf | grep -v  "^#" | grep -v "^$"
pool ntp.aliyun.com iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
allow 192.168.1.0/24
local stratum 10
keyfile /etc/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony
​
systemctl restart chronyd
systemctl enable chronyd
​
客户端
​
yum install chrony -y
vim /etc/chrony.conf
cat /etc/chrony.conf | grep -v  "^#" | grep -v "^$"
pool 10.0.0.21 iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
keyfile /etc/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony
​
systemctl restart chronyd ; systemctl enable chronyd
​
​
yum install chrony -y ; sed -i "s#2.centos.pool.ntp.org#10.0.0.21#g" /etc/chrony.conf ; systemctl restart chronyd ; systemctl enable chronyd
​
​
使用客户端进行验证
​
chronyc sources -v
​

1.12.配置ulimit

ulimit -SHn 65535
cat >> /etc/security/limits.conf <<EOF
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* seft memlock unlimited
* hard memlock unlimitedd
EOF

1.13.配置免密登录

yum install -y sshpass
ssh-keygen -f /root/.ssh/id_rsa -P ''
export IP="192.168.1.76 192.168.1.77 192.168.1.78 192.168.1.79 192.168.1.80 192.168.1.86 192.168.1.87"
export SSHPASS=123123
for HOST in $IP;do
     sshpass -e ssh-copy-id -o StrictHostKeyChecking=no $HOST
done

1.14.添加启用源

为 RHEL-8或 CentOS-8配置源
yum install https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm
​
为 RHEL-7 SL-7 或 CentOS-7 安装 ELRepo 
yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
​
查看可用安装包
yum  --disablerepo="*"  --enablerepo="elrepo-kernel"  list  available
​

1.15.升级内核至4.18版本以上

安装最新的内核
# 我这里选择的是稳定版kernel-ml   如需更新长期维护版本kernel-lt  
yum  --enablerepo=elrepo-kernel  install  kernel-ml
​
查看已安装那些内核
rpm -qa | grep kernel
kernel-core-4.18.0-358.el8.x86_64
kernel-tools-4.18.0-358.el8.x86_64
kernel-ml-core-5.16.7-1.el8.elrepo.x86_64
kernel-ml-5.16.7-1.el8.elrepo.x86_64
kernel-modules-4.18.0-358.el8.x86_64
kernel-4.18.0-358.el8.x86_64
kernel-tools-libs-4.18.0-358.el8.x86_64
kernel-ml-modules-5.16.7-1.el8.elrepo.x86_64
​
​
查看默认内核
grubby --default-kernel
/boot/vmlinuz-5.16.7-1.el8.elrepo.x86_64
​
​
若不是最新的使用命令设置
grubby --set-default /boot/vmlinuz-「您的内核版本」.x86_64
​
重启生效
reboot
​
整合命令为：
yum install https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm -y ; yum  --disablerepo="*"  --enablerepo="elrepo-kernel"  list  available -y ; yum  --enablerepo=elrepo-kernel  install  kernel-ml -y ; grubby --default-kernel ; reboot

1.16.安装ipvsadm 

yum install ipvsadm ipset sysstat conntrack libseccomp -y
​
cat >> /etc/modules-load.d/ipvs.conf <<EOF
cat 
ip_vs
ip_vs_rr
ip_vs_wrr
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF
​
systemctl restart systemd-modules-load.service
​
lsmod | grep -e ip_vs -e nf_conntrack
ip_vs_sh               16384  0
ip_vs_wrr              16384  0
ip_vs_rr               16384  0
ip_vs                 180224  6 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack          176128  1 ip_vs
nf_defrag_ipv6         24576  2 nf_conntrack,ip_vs
nf_defrag_ipv4         16384  1 nf_conntrack
libcrc32c              16384  3 nf_conntrack,xfs,ip_vs

1.17.修改内核参数

cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 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

1.18.所有节点配置hosts本地解析

cat > /etc/hosts <<EOF
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.76 k8s-master01
192.168.1.77 k8s-master02
192.168.1.78 k8s-master03
192.168.1.79 k8s-node01
192.168.1.80 k8s-node02
192.168.1.86 lb01
192.168.1.87 lb02
192.168.1.88 lb-vip
EOF

2.k8s基本组件安装

2.1.所有k8s节点安装Containerd作为Runtime

yum install containerd -y

2.1.1配置Containerd所需的模块

cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF

2.1.2加载模块

systemctl restart systemd-modules-load.service

2.1.3配置Containerd所需的内核

cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF
​
# 加载内核
​
sysctl --system
​

2.1.4创建Containerd的配置文件

mkdir -p /etc/containerd
containerd config default | tee /etc/containerd/config.toml
​
​
修改Containerd的配置文件
vim /etc/containerd/config.toml
​
# 找到containerd.runtimes.runc.options，在其下加入SystemdCgroup = true
​
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
              SystemdCgroup = true
    [plugins."io.containerd.grpc.v1.cri".cni]
​
# 将sandbox_image默认地址改为符合版本地址
​
    sandbox_image = "registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.6"
​
​

2.1.5启动并设置为开机启动

systemctl daemon-reload
systemctl enable --now 
​
​

2.1.6配置crictl客户端连接的运行时位置

cat > /etc/crictl.yaml <<EOF
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 10
debug: false
EOF
​

2.2.k8s与etcd下载及安装（仅在master01操作）

2.2.1下载k8s安装包（你用哪个下哪个）

1.下载kubernetes1.23.+的二进制包
github二进制包下载地址：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.23.md
​
wget https://dl.k8s.io/v1.23.3/kubernetes-server-linux-amd64.tar.gz
​
2.下载etcdctl二进制包
github二进制包下载地址：https://github.com/etcd-io/etcd/releases
​
wget https://github.com/etcd-io/etcd/releases/download/v3.5.2/etcd-v3.5.2-linux-amd64.tar.gz
​
3.docker-ce二进制包下载地址
二进制包下载地址：https://download.docker.com/linux/static/stable/x86_64/
​
这里需要下载20.10.+版本
​
wget https://download.docker.com/linux/static/stable/x86_64/docker-20.10.9.tgz
​
4.containerd二进制包下载
github下载地址：https://github.com/containerd/containerd/releases
​
containerd下载时下载带cni插件的二进制包。
​
wget https://github.com/containerd/containerd/releases/download/v1.6.0-rc.2/cri-containerd-cni-1.6.0-rc.2-linux-amd64.tar.gz
​
5.下载cfssl二进制包
github二进制包下载地址：https://github.com/cloudflare/cfssl/releases
​
wget https://github.com/cloudflare/cfssl/releases/download/v1.6.1/cfssl_1.6.1_linux_amd64
wget https://github.com/cloudflare/cfssl/releases/download/v1.6.1/cfssljson_1.6.1_linux_amd64
wget https://github.com/cloudflare/cfssl/releases/download/v1.6.1/cfssl-certinfo_1.6.1_linux_amd64
​
6.cni插件下载
github下载地址：https://github.com/containernetworking/plugins/releases
​
wget https://github.com/containernetworking/plugins/releases/download/v1.0.1/cni-plugins-linux-amd64-v1.0.1.tgz
​
7.crictl客户端二进制下载
github下载：https://github.com/kubernetes-sigs/cri-tools/releases
​
wget https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.23.0/crictl-v1.23.0-linux-amd64.tar.gz
​
​
​
​
解压k8s安装文件
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}
​
解压etcd安装文件
tar -xf etcd-v3.5.2-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.5.2-linux-amd64/etcd{,ctl}
​
# 查看/usr/local/bin下内容
​
ls /usr/local/bin/
etcd  etcdctl  kube-apiserver  kube-controller-manager  kubectl  kubelet  kube-proxy  kube-scheduler
​

2.2.2查看版本

[root@k8s-master01 ~]# kubelet --version
Kubernetes v1.23.3
[root@k8s-master01 ~]# etcdctl version
etcdctl version: 3.5.1
API version: 3.5
​

2.2.3将组件发送至其他k8s节点

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
​

2.2.4克隆证书相关文件

git clone https://github.com/cby-chen/Kubernetes.git

2.2.5所有k8s节点创建目录

mkdir -p /opt/cni/bin

3.相关证书生成

master01节点下载证书生成工具
wget "https://github.com/cloudflare/cfssl/releases/download/v1.6.1/cfssl_1.6.1_linux_amd64" -O /usr/local/bin/cfssl
wget "https://github.com/cloudflare/cfssl/releases/download/v1.6.1/cfssljson_1.6.1_linux_amd64" -O /usr/local/bin/cfssljson
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson
​

3.1.生成etcd证书

特别说明除外，以下操作在所有master节点操作

3.1.1所有master节点创建证书存放目录

mkdir /etc/etcd/ssl -p

3.1.2master01节点生成etcd证书

cd Kubernetes/pki/
​
# 生成etcd证书和etcd证书的key（如果你觉得以后可能会扩容，可以在ip那多写几个预留出来）
​
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-master03,192.168.1.76,192.168.1.77,192.168.1.78 \\
   -profile=kubernetes \\
   etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd
​

3.1.3将证书复制到其他节点

Master='k8s-master02 k8s-master03'
for NODE in $Master; do
     ssh $NODE "mkdir -p /etc/etcd/ssl"
     for FILE in etcd-ca-key.pem  etcd-ca.pem  etcd-key.pem  etcd.pem; do
       scp /etc/etcd/ssl/${FILE} $NODE:/etc/etcd/ssl/${FILE}
     done
 done
​

3.2.生成k8s相关证书

特别说明除外，以下操作在所有master节点操作

3.2.1所有k8s节点创建证书存放目录

mkdir -p /etc/kubernetes/pki

3.2.2master01节点生成k8s证书

# 生成一个根证书
​
cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca
​
# 10.96.0.1是service网段的第一个地址，需要计算，192.168.1.88为高可用vip地址
​
cfssl gencert   \\
-ca=/etc/kubernetes/pki/ca.pem   \\
-ca-key=/etc/kubernetes/pki/ca-key.pem   \\
-config=ca-config.json   \\
-hostname=10.96.0.1,192.168.1.88,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,x.oiox.cn,k.oiox.cn,l.oiox.cn,o.oiox.cn,192.168.1.76,192.168.1.77,192.168.1.78   \\
-profile=kubernetes   apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver
​
​

3.2.3生成apiserver聚合证书

cfssl gencert   -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca 
​
# 有一个警告，可以忽略
​
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
​
​

3.2.4生成controller-manage的证书

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
​
# 设置一个集群项
​
kubectl config set-cluster kubernetes \\
     --certificate-authority=/etc/kubernetes/pki/ca.pem \\
     --embed-certs=true \\
     --server=https://192.168.1.88:8443 \\
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
​
# 设置一个环境项，一个上下文
​
kubectl config set-context system:kube-controller-manager@kubernetes \\
    --cluster=kubernetes \\
    --user=system:kube-controller-manager \\
    --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
​
# 设置一个用户项
​
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
​
# 设置默认环境
​
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://192.168.1.88:8443 \\
     --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://192.168.1.88:8443     --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
​
​

3.2.5创建ServiceAccount Key ——secret

openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub
​
​

3.2.6将证书发送到其他master节点

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
​
​

3.2.7查看证书

ls /etc/kubernetes/pki/
admin.csr      apiserver-key.pem  ca.pem                      front-proxy-ca.csr      front-proxy-client-key.pem  scheduler.csr
admin-key.pem  apiserver.pem      controller-manager.csr      front-proxy-ca-key.pem  front-proxy-client.pem      scheduler-key.pem
admin.pem      ca.csr             controller-manager-key.pem  front-proxy-ca.pem      sa.key                      scheduler.pem
apiserver.csr  ca-key.pem         controller-manager.pem      front-proxy-client.csr  sa.pub
​
# 一共23个就对了
​
ls /etc/kubernetes/pki/ |wc -l
23
​
​

4.k8s系统组件配置

4.1.etcd配置

4.1.1master01配置

cat > /etc/etcd/etcd.config.yml << EOF 
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://192.168.1.76:2380'
listen-client-urls: 'https://192.168.1.76:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.1.76:2380'
advertise-client-urls: 'https://192.168.1.76:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.1.76:2380,k8s-master02=https://192.168.1.77:2380,k8s-master03=https://192.168.1.78:2380'
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
EOF
​

4.1.2master02配置

cat > /etc/etcd/etcd.config.yml << EOF 
name: 'k8s-master02'
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://192.168.1.77:2380'
listen-client-urls: 'https://192.168.1.77:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.1.77:2380'
advertise-client-urls: 'https://192.168.1.77:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.1.76:2380,k8s-master02=https://192.168.1.77:2380,k8s-master03=https://192.168.1.78:2380'
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
EOF

4.1.3master03配置

cat > /etc/etcd/etcd.config.yml << EOF 
name: 'k8s-master03'
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://192.168.1.78:2380'
listen-client-urls: 'https://192.168.1.78:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.1.78:2380'
advertise-client-urls: 'https://192.168.1.78:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.1.76:2380,k8s-master02=https://192.168.1.77:2380,k8s-master03=https://192.168.1.78:2380'
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
EOF

4.2.创建service（所有master节点操作）

4.2.1创建etcd.service并启动

cat > /usr/lib/systemd/system/etcd.service << EOF
​
[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
​
EOF
​

4.2.2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

4.2.3查看etcd状态

export ETCDCTL_API=3
etcdctl --endpoints="192.168.1.78:2379,192.168.1.77:2379,192.168.1.76:2379" --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
+-------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|     ENDPOINT      |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+-------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 192.168.1.78:2379 | 56875ab4a12c94e8 |   3.5.1 |   25 kB |     false |      false |         2 |          8 |                  8 |        |
| 192.168.1.77:2379 | 33df6a8fe708d3fd |   3.5.1 |   25 kB |      true |      false |         2 |          8 |                  8 |        |
| 192.168.1.76:2379 | 58fbe5ec9743048f |   3.5.1 |   20 kB |     false |      false |         2 |          8 |                  8 |        |
+-------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
​
​

5.高可用配置

5.1在lb01和lb02两台服务器上操作

5.1.1安装keepalived和haproxy服务

yum -y install keepalived haproxy

5.1.2修改haproxy配置文件（两台配置文件一样）

# cp /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.bak
​
cat >/etc/haproxy/haproxy.cfg<<"EOF"
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 0.0.0.0:8443
 bind 127.0.0.1:8443
 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  master01  192.168.1.76:6443 check
 server  master02  192.168.1.77:6443 check
 server  master03  192.168.1.78:6443 check
EOF

5.1.3lb01配置keepalived master节点

#cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
​
cat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived
​
global_defs {
    router_id LVS_DEVEL
}
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 ens18
    mcast_src_ip 192.168.1.86
    virtual_router_id 51
    priority 100
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.1.88
    }
    track_script {
      chk_apiserver 
} }
​
EOF
​

5.1.4lb02配置keepalived backup节点

# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
​
cat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived
​
global_defs {
    router_id LVS_DEVEL
}
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 ens18
    mcast_src_ip 192.168.1.87
    virtual_router_id 51
    priority 50
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.1.88
    }
    track_script {
      chk_apiserver 
} }
​
EOF

5.1.5健康检查脚本配置（两台lb主机）

​
cat >  /etc/keepalived/check_apiserver.sh << EOF
#!/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
EOF
​
# 给脚本授权
​
chmod +x /etc/keepalived/check_apiserver.sh
​
​

5.1.6启动服务

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

5.1.7测试高可用

# 能ping同
​
[root@k8s-node02 ~]# ping 192.168.1.88
​
# 能telnet访问
​
[root@k8s-node02 ~]# telnet 192.168.1.88 8443
​
# 关闭主节点，看vip是否漂移到备节点
​
​

字数超限制，未完待续

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