利用kubeadm+keepalived创建高可用kuberne

2020-08-25 本文已影响0人以梦为马_8467

本文参考官方文档,采用堆控制层面节点方式部署高可用集群,etcd组件和控制平面组件都以pod形式部署在master节点上,利用keepalived实现api-server组件的高可用访问
拓扑图

k8s.png

准备工作

资源准备

k8s-1 192.168.229.131
k8s-2 192.168.229.132
k8s-3 192.168.229.133
VIP: 192.168.229.139

环境准备

配置主机名
192.168.229.131上执行

hostname k8s-1

192.168.229.132上执行

hostname k8s-2

192.168.229.133上执行

hostname k8s-3

配置hosts(三个节点上执行)

cat <<EOF >  /etc/hosts
k8s-1  192.168.229.131
k8s-2  192.168.229.132
k8s-3  192.168.229.133
EOF

禁用swap(三个节点上执行 )

swapoff -a

配置NTP服务(三个节点上执行)

systemctl start ntpd

调整内核参数(三个节点上执行)

临时修改

sysctl net.bridge.bridge-nf-call-iptables=1

永久修改

cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl -p /etc/sysctl.d/k8s.conf

配置yum源(三个节点上执行)

[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

安装docker,kubeadm(三个节点上执行)

yum install -y yum-utils
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum -y install docker-ce docker-ce-selinux kubeadm

下载k8s镜像(三个节点上执行)
8.1 查看指定版本组件
任意一台node上执行

kubeadm config images list --kubernetes-version=1.18.0

获取版本组件输出,如下所示:

images=(
    kube-apiserver:v1.18.0
    kube-controller-manager:v1.18.0
    kube-scheduler:v1.18.0
    kube-proxy:v1.18.0
    pause:3.2
    etcd:3.4.3-0
    coredns:1.6.7
)

8.2 下载镜像

for imageName in ${images[@]} ; do
    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName
    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
done

安装部署

安装keepalived

配置master

192.168.229.131上编辑/etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
   router_id k8s-1
}
vrrp_instance VI_1 {
    state MASTER
    interface eno16777736
    virtual_router_id 50
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.229.139
    }
}

配置backup

192.168.229.132上编辑/etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
   router_id k8s-2
}
vrrp_instance VI_1 {
    state BACKUP
    interface eno16777736
    virtual_router_id 50
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.229.139
    }
}

192.168.229.133上编辑/etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
   router_id k8s-3
}
vrrp_instance VI_1 {
    state BACKUP
    interface eno16777736
    virtual_router_id 50
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.229.139
    }
}

启动keepalived(三个节点上执行)

systemctl start keepalived

安装k8s集群master节点

初始化第一台master节点

192.168.229.121上执行

kubeadm init --control-plane-endpoint=192.168.229.139:6443  --upload-certs --kubernetes-version=1.18.0 --pod-network-cidr=10.25.0.0/16

执行完毕后会输出添加master节点和添加worker节点命令,拷贝复制

添加其他master节点