目录
- 整体环境
- Node节点添加
- 参考
注意:除了Master节点初始化及Node节点添加分别在Master节点和Node节点执行外,其余所有命令均在所有节点执行
整体环境
一台master节点,多台node节点。采用了Centos 7,有网络,互相可以ping通。
安装后续用到的包
yum install -y yum-utils conntrack ntpdate ntp ipvsadm ipset jq sysstat libseccomp
firewalld
关闭firewalld
systemctl stop firewalld && systemctl disable firewalld
iptables
安装iptables,设置空表
yum -y install iptables-services && systemctl start iptables && systemctl enable iptables && iptables -F && service iptables save
selinux
关闭selinux
setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config
swap
关闭分区交换
swapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
调整时区
调整为上海,保持集群所有节点时间一致
timedatectl set-timezone Asia/Shanghai
timedatectl set-local-rtc 0
#重启依赖于系统时间的服务
systemctl restart rsyslog
systemctl restart crond
修改内核参数
修改网桥等内核参数
cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
net.ipv4.ip_forward=1
net.ipv4.tcp_tw_recycle=0
vm.swappiness=0 # 禁止使用swap空间,只有当系统00M时才允许使用它
vm.overcommit_memory=1 # 不检查物理内存是否够用
vm.panic_on_oom=0 # 开启oom
fs.inotify.max_user_instances=8192
fs.inotify.max_user_watches=1048576
fs.file-max=52786963
fs.nr_open=52706963
net.ipv6.conf.all.disable_ipv6=1
net.netfilter.nf_conntrack_max=2310720
EOF
sysctl -p /etc/sysctl.d/k8s.conf
以下命令在Master节点初始化前运行也可以
modprobe br_netfilter
lsmod | grep br_netfilter
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system
开启IPVS
cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
EOF
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack_ipv4
docker ce配置
cat > /etc/docker/daemon.json <<EOF
{
"exec-opts":["native.cgroupdriver=systemd"],
"log-driver":"json-file",
"log-opts":{
"max-size": "100m"
},
"storage-driver": "overlay2"
}
EOF
mkdir -p /etc/systemd/system/docker.service.d
#重启docker服务
systemctl daemon-reload && systemctl restart docker && systemctl enable docker
kubeadm、kubelet、kubectl
使用阿里云的源,你可以科学上网的话就用官网的
cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
exclude=kubelet kubeadm kubectl
EOF
sudo yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
sudo systemctl enable --now kubelet
安装镜像
kubeadm config images pull \
--image-repository registry.cn-hangzhou.aliyuncs.com/google_containers
Master节点初始化
kubeadm init --pod-network-cidr=172.16.0.0/16 --apiserver-advertise-address=your_master_ip --image-repository registry.cn-hangzhou.aliyuncs.com/google_containers | tee kubeadm-init.log
注意修改your_master_ip为你的master节点的ip
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
export KUBECONFIG=/etc/kubernetes/admin.conf
安装CNI网络插件calico
wget https://docs.projectcalico.org/v3.18/manifests/calico.yaml
修改为init时的网段
kubectl create -f calico.yaml
Node节点添加
在kubeadm-init.log下找到类似
kubectl join master_ip:port --token xxx --discovery-token-ca-cert-hash xxx
的命令,在Node节点运行即可。
之后,可以在master节点使用
kubectl get nodes
查看三个节点的状态
参考
Create cluster with kubeadm
calico