Centos 7.x 线上安装 Kubernetes

镜像下载、域名解析、时间同步请点击 阿里云开源镜像站

安装依赖包

yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl systat libseccomp wget vim net-tools git iptables-services 

关闭防火墙，为iptables设置规则

systemctl stop firewalld && systemctl disable firewalld && systemctl status firewalld systemctl start iptables && systemctl enable iptables && iptables -F && service iptables save 

关闭SWAP 和 SELINUX

swapoff -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k8s

cat > /etc/sysctl.d/kubernetes.conf << EOF net.bridge.bridge-nf-call-iptables=1   #开启网桥模式 net.bridge.bridge-nf-call-ip6tables=1   #开启网桥模式 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   #关闭IPV6协议 net.netfilter.nf_conntrack_max=2310720 EOF  sysctl -p /etc/sysctl.d/kubernetes.conf 

调整系统时区

# 设置系统时区为 中国/上海 timedatectl set-timezone Asia/Shanghai 

关闭系统不需要服务，postfix是邮件服务

systemctl stop postfix && systemctl disable postfix 

设置rsyslogd 和 systemd journald

# 创建持久化保存日志目录 mkdir -p /var/log/journal # 创建配置文件存放目录 mkdir -p /etc/systemd/journald.conf.d  # 创建配置文件 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  # 重启journald systemctl restart systemd-journald 

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 

安装 Docker 软件

# 配置daemon cat > /etc/docker/daemon.json << EOF {     "exec-opts": ["native.cgroupdriver=systemd"],     "log-driver": "json-file",     "log-opts": {         "max-size": "100m"     } } EOF # 重启docker systemctl daemon-reload && systemctl restart docker 

安装 Kubeadm （主从配置）

# 配置yum源 cat > /etc/yum.repos.d/kubernetes.repo << EOF [kubernetes] name=kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF # 安装 kubeadm 初始化工具，kubectl 命令行管理工具，kubelet yum -y install kubeadm-1.15.1 kubectl-1.15.1 kubelet-1.15.1 # 设置开机自启 systemctl enable kubelet 

初始化主节点

注意：
1.advertiseAddress需要更换为master服务器的ip地址

# 打印默认的初始化文件，打印到kubeadm-init.yaml kubeadm config print init-defaults > kubeadm-init.yaml # 修改 cat > kubeadm-init.yaml << EOF apiVersion: kubeadm.k8s.io/v1beta2 bootstrapTokens: - groups:   - system:bootstrappers:kubeadm:default-node-token   token: abcdef.0123456789abcdef   ttl: 24h0m0s   usages:   - signing   - authentication kind: InitConfiguration localAPIEndpoint:   advertiseAddress: xx.xx.xx.xx   # master节点的IP地址   bindPort: 6443 nodeRegistration:   criSocket: /var/run/dockershim.sock   name: master   taints:   - effect: NoSchedule     key: node-role.kubernetes.io/master --- apiServer:   timeoutForControlPlane: 4m0s apiVersion: kubeadm.k8s.io/v1beta2 certificatesDir: /etc/kubernetes/pki clusterName: kubernetes controllerManager: {} dns:   type: CoreDNS etcd:   local:     dataDir: /var/lib/etcd imageRepository: k8s.gcr.io kind: ClusterConfiguration kubernetesVersion: v1.15.1 networking:   dnsDomain: cluster.local   podSubnet: 10.244.0.0/16   serviceSubnet: 10.96.0.0/12 scheduler: {} --- apiVersion: kubeproxy.config.k8s.io/v1alpha1 kind: KubeProxyConfiguration featureGates:   SupportIPVSProxyMode: true mode: ipvs EOF # 启动 kubeadm init --config=kubeadm-init.yaml | tee kubeadm-init.log  mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config  mkdir -p /root/install-k8s/core mv /root/kubeadm-init.* /root/install-k8s/core 

安装 flannel

mkdir -p /root/install-k8s/plugin/flannel cd /root/install-k8s/plugin/flannel wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml kubectl apply -f /root/install-k8s/plugin/flannel/kube-flannel.yml 

本文转自：https://blog.csdn.net/weixin_45456679/article/details/123423237