CentOS7 cpu:2 内存:2G 磁盘: 100g
1)设置系统主机名以及 Host 文件的相互解析
hostnamectl set-hostname k8s-master01 【node节点: k8s-node01】
2)安装依赖包
yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wget vim net-tools git
3)设置防火墙为 Iptables 并设置空规则
systemctl stop firewalld && systemctl disable firewalld yum -y install iptables-services && systemctl start iptables && systemctl enable iptables && iptables -F && service iptables save
4)关闭 SELINUX
swapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config
5)调整内核参数,对于 K8S
cat > kubernetes.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 OOM 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=52706963 fs.nr_open=52706963 net.ipv6.conf.all.disable_ipv6=1 net.netfilter.nf_conntrack_max=2310720 EOF cp kubernetes.conf /etc/sysctl.d/kubernetes.conf sysctl -p /etc/sysctl.d/kubernetes.conf
6)关闭系统不需要服务
systemctl stop postfix && systemctl disable postfix
7)设置 rsyslogd 和 systemd journald
mkdir /var/log/journal # 持久化保存日志的目录 mkdir /etc/systemd/journald.conf.d cat > /etc/systemd/journald.conf.d/99-prophet.conf <<EOF [Journal] # 持久化保存到磁盘 Storage=persistent # 压缩历史日志 Compress=yes SyncIntervalSec=5m RateLimitInterval=30s RateLimitBurst=1000 # 最大占用空间 10G SystemMaxUse=10G # 单日志文件最大 200M SystemMaxFileSize=200M # 日志保存时间 2 周 MaxRetentionSec=2week # 不将日志转发到 syslog ForwardToSyslog=no EOF systemctl restart systemd-journald
8)升级系统内核为 4.44
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm # 安装完成后检查 /boot/grub2/grub.cfg 中对应内核 menuentry 中是否包含 initrd16 配置,如果没有,再安装 一次! yum --enablerepo=elrepo-kernel install -y kernel-lt # 设置开机从新内核启动 grub2-set-default 'CentOS Linux (4.4.189-1.el7.elrepo.x86_64) 7 (Core)'
9)kube-proxy开启ipvs的前置条件
modprobe br_netfilter 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
10)Docker 安装
yum install -y yum-utils device-mapper-persistent-data lvm2 yum-config-manager \ --add-repo \ http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo yum update -y && yum install -y docker-ce ## 创建 /etc/docker 目录 mkdir /etc/docker # 配置 daemon. cat > /etc/docker/daemon.json <<EOF { "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" } } EOF mkdir -p /etc/systemd/system/docker.service.d # 重启docker服务 systemctl daemon-reload && systemctl restart docker && systemctl enable docker
11)安装 Kubeadm (主从配置)
cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF yum -y install kubeadm-1.15.1 kubectl-1.15.1 kubelet-1.15.1 systemctl enable kubelet.service # 安装kubelet、kubeadm、kubectl 【Kubernetes v1.18.0】 yum install -y kubelet kubeadm kubectl 【eg:】 unknown flag: --experimental-upload-certs To see the stack trace of this error execute with --v=5 or higher v:1.18.0 kubeadm init --config=kubeadm-config.yaml --upload-certs | tee kubeadm-init.log
12)初始化主节点
kubeadm config print init-defaults > kubeadm-config.yaml localAPIEndpoint: advertiseAddress: 192.168.66.10 ##kubeadm-config.yaml 修改的地址 kubernetesVersion: v1.15.1 networking: podSubnet: "10.244.0.0/16" # kubeadm-config.yaml 配置中新增 serviceSubnet: 10.96.0.0/12 --- apiVersion: kubeproxy.config.k8s.io/v1alpha1 kind: KubeProxyConfiguration featureGates: SupportIPVSProxyMode: true mode: ipvs kubeadm init --config=kubeadm-config.yaml --experimental-upload-certs | tee kubeadm-init.log
13)部署网络
mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config kubectl apply -f mkdir -p /install-k8s/core/plugin/flannel cd /install-k8s/core/plugin/flannel wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml kubectl create -f kube-flannel.yml kubectl get pod -n kube-system kubectl get pod -n kube-system -o wide kubectl get pod -n kube-system -w #监控
14)【kubeadm-init.log 文件最后有加入命令】
kubeadm join 192.168.1.11:6443 --token abcdef.0123456789abcdef \ --discovery-token-ca-cert-hash sha256:8831bd9eed05db5160ae6943eb4512b2d384a33ca1e4a87a2eb4aa1b97a64f48