k8s学习笔记-环境准备
Kubernetes设计架构Kubernetes集群包含有节点代理kubelet和Master组件(APIs, scheduler, etc),一切都基于分布式的存储系统。下面这张图是Kubernetes的架构图Kubernetes主要由以下几个核心组件组成:etcd保存了整个集群的状态;apiserver提供了资源操作的唯一入口,并提供认证、授权、访问控制、API注册和发现等...
Kubernetes设计架构
Kubernetes集群包含有节点代理kubelet和Master组件(APIs, scheduler, etc),一切都基于分布式的存储系统。下面这张图是Kubernetes的架构图
Kubernetes主要由以下几个核心组件组成:
- etcd保存了整个集群的状态;
- apiserver提供了资源操作的唯一入口,并提供认证、授权、访问控制、API注册和发现等机制;
- controller manager负责维护集群的状态,比如故障检测、自动扩展、滚动更新等;
- scheduler负责资源的调度,按照预定的调度策略将Pod调度到相应的机器上;
- kubelet负责维护容器的生命周期,同时也负责Volume(CVI)和网络(CNI)的管理;
- Container runtime负责镜像管理以及Pod和容器的真正运行(CRI);
- kube-proxy负责为Service提供cluster内部的服务发现和负载均衡;
除了核心组件,还有一些推荐的Add-ons:
- kube-dns负责为整个集群提供DNS服务
- Ingress Controller为服务提供外网入口
- Heapster提供资源监控
- Dashboard提供GUI
- Federation提供跨可用区的集群
- Fluentd-elasticsearch提供集群日志采集、存储与查询
1 安装前准备
主机列表
本次实验选择5台主机,3台作为master主机,2台作为node节点
节点ip | OS版本 | hostname -f | 安装软件 |
---|---|---|---|
192.168.0.1 | RHEL7.4 | k8s-master01 | docker,etcd,flanneld,kube-apiserver,kube-controller-manager,kube-scheduler |
192.168.0.2 | RHEL7.4 | k8s-master02 | docker,etcd,flanneld,kube-apiserver,kube-controller-manager,kube-scheduler |
192.168.0.3 | RHEL7.4 | k8s-master03 | docker,etcd,flanneld,kube-apiserver,kube-controller-manager,kube-scheduler |
192.168.0.4 | RHEL7.4 | k8s-node01 | docker,flanneld,kubelet,kube-proxy |
192.168.0.5 | RHEL7.4 | k8s-node02 | docker,flanneld,kubelet,kube-proxy |
关闭防火墙和SELINUX
echo "####Shutdown the firwall####"
systemctl stop firewalld.service
systemctl disable firewalld.service
echo "####Shutdown the firwall Done####"
echo -e "\n"echo "####Set the selinux disable####"
sed -i '/^SELINUX=/c SELINUX=disabled' /etc/selinux/config
setenforce 0
echo "####Set the selinux disable Done####"
echo -e "\n"
设置hostname和hosts
hostnamectl --static set-hostname k8s-master01
hostnamectl --static set-hostname k8s-master02
hostnamectl --static set-hostname k8s-master03
hostnamectl --static set-hostname k8s-node01
hostnamectl --static set-hostname k8s-node02cat << EOF >> /etc/hosts
192.168.0.1 k8s-master01 etcd01
192.168.0.2 k8s-master02 etcd02
192.168.0.3 k8s-master03 etcd03
192.168.0.4 k8s-node01
192.168.0.5 k8s-node02
EOF
安装docker
cat << EOF > /etc/yum.repos.d/docker180902.repo
[docker180902]
name=docker180902
baseurl=ftp://192.168.100.193/pub/docker180902/
enabled=1
gpgcheck=0
EOFecho "####install docker####"
yum install -y docker-ce
mkdir -p /etc/systemd/system/docker.service.d && tee /etc/systemd/system/docker.service.d/override.conf <<- EOF
[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock --storage-driver=overlay2
EOF
systemctl daemon-reload
systemctl enable docker && systemctl restart docker
echo "####install docker Done####"
echo -e "\n"
关闭swap
swapoff -a && sysctl -w vm.swappiness=0
vi /etc/fstab
#UUID=7bff6243-324c-4587-b550-55dc34018ebf swap swap defaults 0 0
设置内核参数
cat << EOF | tee /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
vm.swappiness = 0
EOF
sysctl -p /etc/sysctl.d/k8s.conf
创建安装目录
mkdir /k8s/etcd/{bin,cfg,ssl} -p
mkdir /k8s/kubernetes/{bin,cfg,ssl} -p
mkdir /k8s/flanneld/ssl -p
ssh-key免密(k8s-master01上)
ssh-keygen
ssh-copy-id 192.168.0.2
ssh-copy-id 192.168.0.3
ssh-copy-id 192.168.0.4
ssh-copy-id 192.168.0.5
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