Centos7下使用kubeadm快速安装kubernetes集

系统环境

• Centos 7
• 关闭swap
• 尽量使用国内源

Kubernetes组件

image.png

Master节点

• kube-apiserver: 暴露api,集群操作入口
• etcd: 存储
• kueb-scheduler: Pod调度，为Pod分配运行节点
• kube-controller-manager: 管理各种控制器，如节点，pod，replica等

Node节点

• kbuelet: 管理Pod中的容器
• kube-proxy: 访问控制和流量转发
• container-runtime: 容器运行时环境

插件

• DNS
• 网络
• WEB UI
• 等等

安装 Docker

sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sudo yum makecache fast
sudo yum -y install docker-ce
sudo systemctl enable --now docker
#　修改docker cgroupdriver 为systemd
echo '{ "exec-opts": ["native.cgroupdriver=systemd"]}'   > /etc/docker/daemon.json
systemctl restart docker

# 安装指定版本的Docker-CE:
# Step 1: 查找Docker-CE的版本:
# yum list docker-ce.x86_64 --showduplicates | sort -r
# sudo yum -y install docker-ce-[VERSION]

安装 kubelet kubeadm kubectl

cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
sysctl --system

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
yum install -y kubelet kubeadm kubectl
systemctl enable kubelet && systemctl start kubelet

使用kubeadm初始化集群

kubeadm init --pod-network-cidr=10.244.0.0/16 \
  --apiserver-advertise-address=192.168.56.101 \
  --image-repository=registry.cn-hangzhou.aliyuncs.com/google_containers
kubeadm join --apiserver-advertise-address=192.168.56.102 192.168.56.101:6443 
  --token jl21vj.nluztkcmh6onsks8     
  --discovery-token-ca-cert-hash \
  sha256:90a57395a16159748389a302dceb2c8217bed1900aba1b0497015ef8df325c17

网络插件

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

网络代理

如果安装过程中需要配置代理,可通过环境变量配置。systemd管理的服务需要service.utils文件中配置

export http_proxy="http://192.168.56.1:1188" 
export https_proxy="http://192.168.56.1:1188"
export no_proxy="127.0.0.1,192.168.56.101,192.168.56.102,localhost"

参考

kubenrnetes 组件
kubeadm安装使用