- 一、基本说明
- 二、基本环境配置
- 三、基本组件安装
- 四、k8s组件安装
- 五、生成证书
-
六、Kubernetes系统组件配置
- 6.1 etcd配置大致相同，注意修改每个Master节点的etcd配置的主机名和IP地址
- 6.2 所有Master节点创建etcd service并启动
- 6.3 所有Master节点安装keepalived和haproxy
- 6.4 HAProxy配置
- 6.5 KeepAlived配置（注意每个节点的IP和网卡）
- 6.6 健康检查配置
- 6.7 启动HAProxy和KeepAlived
- 6.8 VIP测试
- 6.9 所有节点创建相关目录
- 6.10 所有Master节点创建kube-apiserver
- 6.11 所有Master节点开启kube-apiserver
- 6.12 所有Master节点配置kube-controller-manager
- 6.13 所有Master节点启动kube-controller-manager
- 6.14 所有Master节点配置kube-scheduler
- 七、TLS Bootstrapping配置
- 九、安装calico
- 十、安装CoreDNS
- 十一、集群验证
一、基本说明
本博文将演示CentOS 7二进制方式安装高可用k8s 1.17.x，相对于其他版本，二进制安装方式并无太大区别。
二、基本环境配置
2.1 主机信息
| OS | role && hostname | memory | CPU | Role |
|---|---|---|---|---|
| Centos 7.6 | k8s-master01 | 8G | 4核心 | 192.168.99.101 |
| Centos 7.6 | k8s-master02 | 8G | 4核心 | 192.168.99.102 |
| Centos 7.6 | k8s-master03 | 8G | 4核心 | 192.168.99.103 |
| Centos 7.6 | k8s-node01 | 8G | 4核心 | 192.168.99.104 |
| Centos 7.6 | k8s-node02 | 8G | 4核心 | 192.168.99.105 |
| k8s-master-lb | 192.168.99.108 |
2.2 系统信息
$ cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
$ uname -ra
Linux k8s-master01 5.13.7-1.el7.elrepo.x86_64 #1 SMP Fri Jul 30 10:08:55 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux
2.3 配置所有节点hosts文件
$ cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.99.101 k8s-master01
192.168.99.102 k8s-master02
192.168.99.103 k8s-master03
192.168.99.108 k8s-master-lb
192.168.99.104 k8s-node01
192.168.99.105 k8s-node02
2.4 所有节点关闭firewalld 、selinux
$ systemctl disable --now firewalld
$ setenforce 0
$ sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
2.5 所有节点关闭swap分区
$ swapoff -a && sysctl -w vm.swappiness=0
vm.swappiness = 0
$ sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
2.6 所有节点同步时间
$ ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
$ echo 'Asia/Shanghai' /etc/timezone
$ ntpdate time2.aliyun.com
2.7 Master01节点生成ssh key
$ ssh-keygen -t rsa
2.8 Master01配置免密码登录其他节点
$ for i in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02;do ssh-copy-id -i .ssh/id_rsa.pub $i;done
2.9 所有节点安装基本工具
$ yum install wget jq psmisc vim net-tools yum-utils device-mapper-persistent-data lvm2 git -y
2.10 Master01下载安装文件
$ git clone https://github.com/dotbalo/k8s-ha-install.git
2.11 切换到1.17.x分支
$ git checkout manual-installation-v1.17.x
三、基本组件安装
3.1 所有节点安装ipvs
$ yum install ipvsadm ipset sysstat conntrack libseccomp -y
$ cat <<EOF > /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
EOF
$ systemctl enable --now systemd-modules-load.service
$ lsmod |grep ip_vs
ip_vs_ftp 16384 0
nf_nat 45056 3 iptable_nat,xt_MASQUERADE,ip_vs_ftp
ip_vs_sed 16384 0
ip_vs_nq 16384 0
ip_vs_fo 16384 0
ip_vs_sh 16384 0
ip_vs_dh 16384 0
ip_vs_lblcr 16384 0
ip_vs_lblc 16384 0
ip_vs_wrr 16384 0
ip_vs_rr 16384 4
ip_vs_wlc 16384 0
ip_vs_lc 16384 0
ip_vs 159744 28 ip_vs_wlc,ip_vs_rr,ip_vs_dh,ip_vs_lblcr,ip_vs_sh,ip_vs_fo,ip_vs_nq,ip_vs_lblc,ip_vs_wrr,ip_vs_lc,ip_vs_sed,ip_vs_ftp
nf_conntrack 155648 5 xt_conntrack,nf_nat,nf_conntrack_netlink,xt_MASQUERADE,ip_vs
nf_defrag_ipv6 24576 2 nf_conntrack,ip_vs
libcrc32c 16384 4 nf_conntrack,nf_nat,xfs,ip_vs
3.2 所有节点配置内核参数
$ cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 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
EOF
$ sysctl --system
3.3 配置Docker yum源
$ curl -o /etc/yum.repos.d/docker-ce.repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
$ yum clean all && yum makecache
$ yum list docker-ce --showduplicates | sort -r
# 查看所有的可用版本
$ yum install docker-ce-cli-19.03.9-3.el7 docker-ce-19.03.9-3.el7 -y
$ mkdir -p /etc/docker
$ tee /etc/docker/daemon.json <<EOF
{
"registry-mirrors" : [
"https://8xpk5wnt.mirror.aliyuncs.com"
]
}
EOF
$ systemctl daemon-reload && systemctl enable --now docker
$ docker version
Client: Docker Engine - Community
Version: 19.03.9
API version: 1.40
Go version: go1.13.10
Git commit: 9d988398e7
Built: Fri May 15 00:25:27 2020
OS/Arch: linux/amd64
Experimental: false
Server: Docker Engine - Community
Engine:
Version: 19.03.9
API version: 1.40 (minimum version 1.12)
Go version: go1.13.10
Git commit: 9d988398e7
Built: Fri May 15 00:24:05 2020
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.4.12
GitCommit: 7b11cfaabd73bb80907dd23182b9347b4245eb5d
runc:
Version: 1.0.2
GitCommit: v1.0.2-0-g52b36a2
docker-init:
Version: 0.18.0
GitCommit: fec3683
四、k8s组件安装
4.1 下载kubernetes 1.17.x安装包
$ wget https://storage.googleapis.com/kubernetes-release/release/v1.17.0/kubernetes-server-linux-amd64.tar.gz
4.2 下载etcd 3.3.18安装包
$ wget https://github.com/etcd-io/etcd/releases/download/v3.3.18/etcd-v3.3.18-linux-amd64.tar.gz
4.3 解压kubernetes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}
4.4 解压etcd安装文件
$ tar -zxvf etcd-v3.3.18-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.3.18-linux-amd64/etcd{,ctl}
4.5 版本查看
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.0", GitCommit:"70132b0f130acc0bed193d9ba59dd186f0e634cf", GitTreeState:"clean", BuildDate:"2019-12-07T21:20:10Z", GoVersion:"go1.13.4", Compiler:"gc", Platform:"linux/amd64"}
The connection to the server localhost:8080 was refused - did you specify the right host or port?
$ etcdctl -v
etcdctl version: 3.3.18
API version: 2
4.6 将组件发送到其他节点
$ MasterNodes='k8s-master02 k8s-master03'
$ WorkNodes='k8s-node01 k8s-node02'
$ for NODE in $MasterNodes; 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 $WorkNodes; do scp /usr/local/bin/kube{let,-proxy} $NODE:/usr/local/bin/ ; done
4.7 CNI安装，下载CNI组件
$ wget https://github.com/containernetworking/plugins/releases/download/v0.7.5/cni-plugins-amd64-v0.7.5.tgz
4.8 所有节点创建/opt/cni/bin目录
$ mkdir -p /opt/cni/bin
4.9 解压cni并发送至其他节点
$ tar -zxf cni-plugins-amd64-v0.7.5.tgz -C /opt/cni/bin
$ for NODE in $MasterNodes; do ssh $NODE 'mkdir -p /opt/cni/bin'; scp /opt/cni/bin/* $NODE:/opt/cni/bin/; done
$ for NODE in $WorkNodes; do ssh $NODE 'mkdir -p /opt/cni/bin'; scp /opt/cni/bin/* $NODE:/opt/cni/bin/; done
五、生成证书
5.1 下载生成证书工具
$ 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
5.2 所有Master节点创建etcd证书目录
$ mkdir /etc/etcd/ssl -p
5.3 Master01节点生成etcd证书
$ cd /root/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-master03,192.168.99.101,192.168.99.102,192.168.99.103 \ -profile=kubernetes \
etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd
5.4 将证书复制到其他节点
$ MasterNodes='k8s-master02 k8s-master03'
$ WorkNodes='k8s-node01 k8s-node02'
$ for NODE in $MasterNodes; 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
5.5 所有节点创建kubernetes证书目录
$ mkdir -p /etc/kubernetes/pki
5.6 生成kubernetes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=10.96.0.1,192.168.99.108,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.99.101,192.168.99.102,192.168.99.103 -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://192.168.99.108:8443 \
--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 use-context system:kube-controller-manager@kubernetes \
--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
User "system:kube-controller-manager" set.
$ kubectl config set-context system:kube-controller-manager@kubernetes \
--cluster=kubernetes \
--user=system:kube-controller-manager \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
Context "system:kube-controller-manager@kubernetes" created.
$ kubectl config use-context system:kube-controller-manager@kubernetes \
--kubeconfig=/etc/kubernetes/controller-manager.kubeconfig
Switched to context "system:kube-controller-manager@kubernetes".
$ 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://192.168.99.108:8443 \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Cluster "kubernetes" set.
$ 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
User "system:kube-scheduler" set.
$ kubectl config set-context system:kube-scheduler@kubernetes \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Context "system:kube-scheduler@kubernetes" created.
$ kubectl config use-context system:kube-scheduler@kubernetes \
--kubeconfig=/etc/kubernetes/scheduler.kubeconfig
Switched to context "system:kube-scheduler@kubernetes".
$ 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://192.168.99.108:8443 --kubeconfig=/etc/kubernetes/admin.kubeconfig
Cluster "kubernetes" set.
$ 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
User "kubernetes-admin" set.
$ kubectl config set-context kubernetes-admin@kubernetes --cluster=kubernetes --user=kubernetes-admin --kubeconfig=/etc/kubernetes/admin.kubeconfig
Context "kubernetes-admin@kubernetes" created.
$ kubectl config use-context kubernetes-admin@kubernetes --kubeconfig=/etc/kubernetes/admin.kubeconfig
Switched to context "kubernetes-admin@kubernetes".
$ for NODE in k8s-master01 k8s-master02 k8s-master03; do
\cp kubelet-csr.json kubelet-$NODE-csr.json;
sed -i "s/\$NODE/$NODE/g" kubelet-$NODE-csr.json;
cfssl gencert \
-ca=/etc/kubernetes/pki/ca.pem \
-ca-key=/etc/kubernetes/pki/ca-key.pem \
-config=ca-config.json \
-hostname=$NODE \
-profile=kubernetes \
kubelet-$NODE-csr.json | cfssljson -bare /etc/kubernetes/pki/kubelet-$NODE;
rm -f kubelet-$NODE-csr.json
done
$ for NODE in k8s-master01 k8s-master02 k8s-master03; do
ssh $NODE "mkdir -p /etc/kubernetes/pki"
scp /etc/kubernetes/pki/ca.pem $NODE:/etc/kubernetes/pki/ca.pem
scp /etc/kubernetes/pki/kubelet-$NODE-key.pem $NODE:/etc/kubernetes/pki/kubelet-key.pem
scp /etc/kubernetes/pki/kubelet-$NODE.pem $NODE:/etc/kubernetes/pki/kubelet.pem
rm -f /etc/kubernetes/pki/kubelet-$NODE-key.pem /etc/kubernetes/pki/kubelet-$NODE.pem
done
$ for NODE in k8s-master01 k8s-master02 k8s-master03; do
ssh $NODE "cd /etc/kubernetes/pki && \
kubectl config set-cluster kubernetes \
--certificate-authority=/etc/kubernetes/pki/ca.pem \
--embed-certs=true \
--server=https://192.168.99.108:8443 \
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig && \
kubectl config set-credentials system:node:${NODE} \
--client-certificate=/etc/kubernetes/pki/kubelet.pem \
--client-key=/etc/kubernetes/pki/kubelet-key.pem \
--embed-certs=true \
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig && \
kubectl config set-context system:node:${NODE}@kubernetes \
--cluster=kubernetes \
--user=system:node:${NODE} \
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig && \
kubectl config use-context system:node:${NODE}@kubernetes \
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig"
done
5.7 创建ServiceAccount Key
$ openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
Generating RSA private key, 2048 bit long modulus (2 primes)
...................................................................................+++++
...............+++++
e is 65537 (0x010001)
$ openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub
writing RSA key
$ 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
六、Kubernetes系统组件配置
6.1 etcd配置大致相同，注意修改每个Master节点的etcd配置的主机名和IP地址
$ 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://192.168.99.101:2380'
listen-client-urls: 'https://192.168.99.101:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.99.101:2380'
advertise-client-urls: 'https://192.168.99.101:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://192.168.99.101:2380,k8s-master02=https://192.168.99.102:2380,k8s-master03=https://192.168.99.103:2380'
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:
ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
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:
ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
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-output: default
force-new-cluster: false
6.2 所有Master节点创建etcd service并启动
$ 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
$ mkdir /etc/kubernetes/pki/etcd
$ ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
$ systemctl daemon-reload && systemctl enable --now etcd
6.3 所有Master节点安装keepalived和haproxy
$ yum install keepalived haproxy -y
6.4 HAProxy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
listen stats
bind *:8006
mode http
stats enable
stats hide-version
stats uri /stats
stats refresh 30s
stats realm Haproxy\ Statistics
stats auth admin:admin
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 k8s-master01 192.168.99.101:6443 check
server k8s-master02 192.168.99.102:6443 check
server k8s-master03 192.168.99.103:6443 check
6.5 KeepAlived配置（注意每个节点的IP和网卡）
$ vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 2
weight -5
fall 3
rise 2
}
vrrp_instance VI_1 {
state MASTER
interface ens33
mcast_src_ip 192.168.99.101
virtual_router_id 51
priority 100
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.99.108
}
track_script {
chk_apiserver
} }
6.6 健康检查配置
$ vim /etc/keepalived/check_apiserver.sh
#!/bin/bash
err=0
for k in $(seq 1 5)
do
check_code=$(pgrep kube-apiserver)
if [[ $check_code == "" ]]; then
err=$(expr $err + 1)
sleep 5
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
6.7 启动HAProxy和KeepAlived
$ systemctl enable --now haproxy
$ systemctl enable --now keepalived
6.8 VIP测试
$ ping 192.168.99.108
PING 192.168.99.108 (192.168.99.108) 56(84) bytes of data.
64 bytes from 192.168.99.108: icmp_seq=1 ttl=64 time=1.39 ms
64 bytes from 192.168.99.108: icmp_seq=2 ttl=64 time=2.46 ms
64 bytes from 192.168.99.108: icmp_seq=3 ttl=64 time=1.68 ms
64 bytes from 192.168.99.108: icmp_seq=4 ttl=64 time=1.08 ms
6.9 所有节点创建相关目录
$ mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes
6.10 所有Master节点创建kube-apiserver
$ vim /etc/kubernetes/token.csv
d7d356746b508a1a478e49968fba7947,kubelet-bootstrap,10001,"system:kubelet-bootstrap"
$ 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=192.168.99.108 \
--service-cluster-ip-range=10.96.0.0/12 \
--service-node-port-range=30000-32767 \
--etcd-servers=https://192.168.99.101:2379,https://192.168.99.102:2379,https://192.168.99.103:2379 \
--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 \
--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
6.11 所有Master节点开启kube-apiserver
$ systemctl daemon-reload && systemctl enable --now kube-apiserver
6.12 所有Master节点配置kube-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=10.244.0.0/16 \
--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
6.13 所有Master节点启动kube-controller-manager
$ systemctl daemon-reload && systemctl enable --now kube-controller-manager
6.14 所有Master节点配置kube-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
七、TLS Bootstrapping配置
7.1 在Master01创建bootstrap
$ kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.99.108:8443 --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
$ cp /etc/kubernetes/admin.kubeconfig /root/.kube/config
$ cd ~/k8s-ha-install/bootstrap/
$ kubectl create -f bootstrap.secret.yaml
secret/bootstrap-token-c8ad9c created
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-certificate-rotation created
clusterrole.rbac.authorization.k8s.io/system:kube-apiserver-to-kubelet created
clusterrolebinding.rbac.authorization.k8s.io/system:kube-apiserver created
八、Node节点配置
8.1 复制证书至Node节点
$ for NODE in k8s-node01 k8s-node02; do
ssh $NODE mkdir -p /etc/kubernetes/pki /etc/etcd/ssl /etc/etcd/ssl
for FILE in etcd-ca.pem etcd.pem etcd-key.pem; do
scp /etc/etcd/ssl/$FILE $NODE:/etc/etcd/ssl/
done
for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig; do
scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE}
done
done
8.2 所有Node节点创建相关目录
$ mkdir -p /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/
8.3 所有节点配置kubelet
$ 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"
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node='' --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1"
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: cgroupfs
cgroupsPerQOS: true
clusterDNS:
- 10.96.0.10
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
8.4 启动所有节点kubelet
$ systemctl daemon-reload && systemctl enable --now kubelet
8.5 查看集群状态
$ kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master01 NotReady <none> 54s v1.17.0
k8s-master02 NotReady <none> 54s v1.17.0
k8s-master03 NotReady <none> 54s v1.17.0
k8s-node01 NotReady <none> 54s v1.17.0
k8s-node02 NotReady <none> 54s v1.17.0
8.6 kube-proxy配置
$ cd /root/k8s-ha-install
$ 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)
$ PKI_DIR=/etc/kubernetes/pki
$ K8S_DIR=/etc/kubernetes
$ kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.99.108:8443 --kubeconfig=${K8S_DIR}/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
8.7 赋值Service文件
$ for NODE in k8s-master01 k8s-master02 k8s-master03; do
scp ${K8S_DIR}/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
scp kube-proxy/kube-proxy.conf $NODE:/etc/kubernetes/kube-proxy.conf
scp kube-proxy/kube-proxy.service $NODE:/usr/lib/systemd/system/kube-proxy.service
done
$ for NODE in k8s-node01 k8s-node02; do
scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
scp kube-proxy/kube-proxy.conf $NODE:/etc/kubernetes/kube-proxy.conf
scp kube-proxy/kube-proxy.service $NODE:/usr/lib/systemd/system/kube-proxy.service
done
8.8 所有节点启动kube-proxy
$ systemctl daemon-reload && systemctl enable --now kube-proxy
九、安装calico
9.1 安装Calico 3.11.1
$ cd /root/k8s-ha-install/Calico/
$ kubectl create -f calico.yaml
9.2 查看Calico状态
$ kubectl get pod -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
calico-kube-controllers-648f4868b8-59s87 1/1 Running 2 61s 10.244.85.194 k8s-node01 <none> <none>
calico-node-8rvl9 1/1 Running 1 61s 192.168.99.103 k8s-master03 <none> <none>
calico-node-bjpng 1/1 Running 1 61s 192.168.99.102 k8s-master02 <none> <none>
calico-node-f7spq 1/1 Running 1 61s 192.168.99.101 k8s-master01 <none> <none>
calico-node-k8797 1/1 Running 1 61s 192.168.99.104 k8s-node01 <none> <none>
calico-node-q8djw 1/1 Running 1 61s 192.168.99.105 k8s-node02 <none> <none>
$ kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master01 Ready <none> 84s v1.17.0
k8s-master02 Ready <none> 84s v1.17.0
k8s-master03 Ready <none> 84s v1.17.0
k8s-node01 Ready <none> 84s v1.17.0
k8s-node02 Ready <none> 84s v1.17.0
$ kubectl cluster-info
Kubernetes master is running at https://192.168.99.108:8443
十、安装CoreDNS
$ cd /root/k8s-ha-install/CoreDNS/
$ kubectl create -f coredns.yaml
$ kubectl get po -n kube-system
$ kubectl get pod -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
calico-kube-controllers-648f4868b8-59s87 1/1 Running 2 2m25s 10.244.85.194 k8s-node01 <none> <none>
calico-node-8rvl9 1/1 Running 1 2m25s 192.168.99.103 k8s-master03 <none> <none>
calico-node-bjpng 1/1 Running 1 2m25s 192.168.99.102 k8s-master02 <none> <none>
calico-node-f7spq 1/1 Running 1 2m25s 192.168.99.101 k8s-master01 <none> <none>
calico-node-k8797 1/1 Running 1 2m25s 192.168.99.104 k8s-node01 <none> <none>
calico-node-q8djw 1/1 Running 1 2m25s 192.168.99.105 k8s-node02 <none> <none>
coredns-76b74f549-xlfc2 1/1 Running 1 95s 10.244.122.130 k8s-master02 <none> <none>
$ kubectl logs -f coredns-76b74f549-xlfc2 -n kube-system
[INFO] plugin/ready: Still waiting on: "kubernetes"
.:53
[INFO] plugin/reload: Running configuration MD5 = 8b19e11d5b2a72fb8e63383b064116a1
CoreDNS-1.6.6
linux/amd64, go1.13.5, 6a7a75e
十一、集群验证
11.1 安装busybox
$ cat<<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
name: busybox
namespace: default
spec:
containers:
- name: busybox
image: busybox:1.28
command:
- sleep
- "3600"
imagePullPolicy: IfNotPresent
restartPolicy: Always
EOF
11.2 验证解析
$ kubectl exec busybox -n default -- nslookup kubernetes
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: kubernetes
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local
$ kubectl exec busybox -n default -- nslookup kube-dns.kube-system
Server: 10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name: kube-dns.kube-system
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local