Kubernetes入门至精通集群搭建

　　系统初始化
　　设置系统主机名以及Host文件的相互解析hostnamectl set-hostname k8s-master-01
　　安装依赖包yum install -y conntrack ntpdate ntp ipvsadm ipset  iptables curl sysstat libseccomp wget  vim net-tools git
　　修改时间同步服务器并重启# master01修改/etc/chrony.conf server ntp1.aliyun.com iburst server ntp2.aliyun.com iburst server ntp3.aliyun.com iburst allow 192.168.88.0/24 local stratum 10  # node01和node02修改/etc/chrony.conf server 192.168.88.11 iburst  # 重启依赖于系统时间的服务 systemctl restart chronyd systemctl enable chronyd
　　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
　　关闭 SELINUXswapoff -a && sed -i ＂/ swap / s/^(.*)$/#1/g＂ /etc/fstab setenforce 0 && sed -i ＂s/^SELINUX=.*/SELINUX=disabled/＂ /etc/selinux/config
　　调整内核参数，对于 K8Scat > kubernetes.conf < /etc/systemd/journald.conf.d/99-prophet.conf <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`
　　升级系统内核为 4.44
　　CentOS 7.x 系统自带的 3.10.x 内核存在一些 Bugs，导致运行的 Docker、Kubernetes 不稳定，例如：rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpmrpm -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 或者下载kernel-lt-4.4.222-1.el7.elrepo.x86_64.rpm离线后安装 yum -y install /root/kernel-lt-4.4.222-1.el7.elrepo.x86_64.rpm # 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)＂ # 关机后拍个快照 shutdown -h nowKubeadm部署安装
　　kube-proxy开启ipvs的前置条件modprobe br_netfilter  cat > /etc/sysconfig/modules/ipvs.modules < /etc/docker/daemon.json < /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
　　上传镜像拷贝kubeadm-basic.images.tar.gz至服务器中  systemctl enable kubelet  tar -zxvf kubeadm-basic.images.tar.gz  vim loadimages.sh #!/bin/bash ls /root/kubeadm-basic.images > /tmp/images.cache for i in $( cat /tmp/images.cache ) do   docker load -i /root/kubeadm-basic.images/$i done rm -rf /tmp/images.cache  chmod a+x loadimages.sh ./loadimages.sh
　　初始化主节点kubeadm config print init-defaults > kubeadm-config.yaml  vi kubeadm-config.yaml   localAPIEndpoint:     advertiseAddress: 192.168.88.11 # 修改   kubernetesVersion: v1.15.1 #修改   networking:     podSubnet: ＂10.244.0.0/16＂ #添加 --- #添加该行及以下内容 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
　　加入主节点以及其余工作节点执行安装日志中的加入命令即可 mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config  其他节点运行 kubeadm join 192.168.88.11:6443 --token abcdef.0123456789abcdef    --discovery-token-ca-cert-hash sha256:ed7e6ca7683fb6423e4dc561d32672398b4a1db2e0426dbf57fd25eaf5a5af2d
　　部署网络kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
　　关机拍快照