centos7纯手动安装kubernetes-v1.11版本

简介

本文章主要介绍如何通过使用官方提供 的二进制包安装配置k8s集群

实验环境说明

实验架构

lab1: master 11.11.11.111 lab2: node 11.11.11.112 lab3: node 11.11.11.113 复制代码

实验使用的Vagrantfile

# -*- mode: ruby -*- # vi: set ft=ruby : ENV["LC_ALL"] = "en_US.UTF-8" Vagrant.configure("2") do |config| (1..3).each do |i| config.vm.define "lab#{i}" do |node| node.vm.box = "centos-7.4-docker-17" node.ssh.insert_key = false node.vm.hostname = "lab#{i}" node.vm.network "private_network", ip: "11.11.11.11#{i}" node.vm.provision "shell", inline: "echo hello from node #{i}" node.vm.provider "virtualbox" do |v| v.cpus = 2 v.customize ["modifyvm", :id, "--name", "lab#{i}", "--memory", "2048"] end end end end 复制代码

安装

配置系统相关参数

如下操作在所有节点操作

# 临时禁用selinux # 永久关闭 修改/etc/sysconfig/selinux文件设置 sed -i 's/SELINUX=permissive/SELINUX=disabled/' /etc/sysconfig/selinux setenforce 0 # 临时关闭swap # 永久关闭 注释/etc/fstab文件里swap相关的行 swapoff -a # 开启forward # Docker从1.13版本开始调整了默认的防火墙规则 # 禁用了iptables filter表中FOWARD链 # 这样会引起Kubernetes集群中跨Node的Pod无法通信 iptables -P FORWARD ACCEPT # 配置转发相关参数，否则可能会出错 cat <<EOF > /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 vm.swappiness=0 EOF sysctl --system # 加载ipvs相关内核模块 # 如果重新开机，需要重新加载 modprobe ip_vs modprobe ip_vs_rr modprobe ip_vs_wrr modprobe ip_vs_sh modprobe nf_conntrack_ipv4 lsmod | grep ip_vs # 配置开启自加载 cat >/etc/modules-load.d/k8s-ipvs.conf<<EOF ip_vs ip_vs_rr ip_vs_wrr ip_vs_sh nf_conntrack_ipv4 EOF 复制代码

配置hosts解析

如下操作在所有节点操作

cat >>/etc/hosts<<EOF 11.11.11.111 lab1 11.11.11.112 lab2 11.11.11.113 lab3 EOF 复制代码

安装配置docker

v1.11.0版本推荐使用docker v17.03, v1.11,v1.12,v1.13, 也可以使用，再高版本的docker可能无法正常使用。 测试发现17.09无法正常使用，不能使用资源限制(内存CPU)

如下操作在所有节点操作

安装docker

# 卸载安装指定版本docker-ce yum remove -y docker-ce docker-ce-selinux container-selinux yum install -y --setopt=obsoletes=0 \ docker-ce-17.03.1.ce-1.el7.centos \ docker-ce-selinux-17.03.1.ce-1.el7.centos 复制代码

启动docker

systemctl enable docker && systemctl restart docker 复制代码

安装CFSSL

只在lab1节点操作

# 下载 # 百度云链接：https://pan.baidu.com/s/1kgV40nwHy1IKnnLD6zH4cQ 密码：alyj mkdir -pv /server/software/k8s cd /server/software/k8s yum install -y wget wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 # 安装 mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo mv cfssl_linux-amd64 /usr/local/bin/cfssl mv cfssljson_linux-amd64 /usr/local/bin/cfssljson chmod +x /usr/local/bin/cfssl* 复制代码

配置CA

只在lab1节点操作

此处的CA配置，后面配置etcd和k8s时都需要使用

mkdir -pv $HOME/ssl && cd $HOME/ssl cat >ca-config.json<<EOF { "signing": { "default": { "expiry": "87600h" }, "profiles": { "kubernetes": { "usages": [ "signing", "key encipherment", "server auth", "client auth" ], "expiry": "87600h" } } } } EOF 复制代码

配置etcd集群

生成etcd-ca

只在lab1节点操作

# 写入配置 cat >etcd-ca-csr.json<<EOF { "CN": "etcd", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "etcd", "OU": "Etcd Security" } ] } EOF # 生成 etcd root ca cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare etcd-ca cat >etcd-csr.json<<EOF { "CN": "etcd", "hosts": [ "127.0.0.1", "11.11.11.111", "11.11.11.112", "11.11.11.113" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "etcd", "OU": "Etcd Security" } ] } EOF # 生成 etcd ca cfssl gencert -ca=etcd-ca.pem -ca-key=etcd-ca-key.pem -config=ca-config.json \ -profile=kubernetes etcd-csr.json | cfssljson -bare etcd mkdir -pv /etc/etcd/ssl cp etcd*.pem /etc/etcd/ssl ls /etc/etcd/ssl/etcd*.pem # 复制到其他节点 cd /etc/etcd && tar cvzf etcd-ssl.tgz ssl/ scp /etc/etcd/etcd-ssl.tgz lab2:~/ scp /etc/etcd/etcd-ssl.tgz lab3:~/ ssh lab2 'mkdir -pv /etc/etcd && tar xf etcd-ssl.tgz -C /etc/etcd && ls -l /etc/etcd/ssl' ssh lab3 'mkdir -pv /etc/etcd && tar xf etcd-ssl.tgz -C /etc/etcd && ls -l /etc/etcd/ssl' 复制代码

安装启动etcd

如下操作在所有节点操作

# 安装 # 百度云链接：https://pan.baidu.com/s/1IVHyMqiJrlq9gmbF49Ly3Q 密码：w5nx mkdir -pv /server/software/k8s cd /server/software/k8s yum install -y wget wget https://github.com/coreos/etcd/releases/download/v3.2.18/etcd-v3.2.18-linux-amd64.tar.gz tar xf etcd-v3.2.18-linux-amd64.tar.gz mv etcd-v3.2.18-linux-amd64 /usr/local/etcd-v3.2.18 ln -sv /usr/local/etcd-v3.2.18 /usr/local/etcd cd /usr/local/etcd && mkdir bin && mv etcd etcdctl bin /usr/local/etcd/bin/etcd --version cd $HOME # 配置启动脚本 export ETCD_NAME=$(hostname) export INTERNAL_IP=$(hostname -i | awk '{print $NF}') export ECTD_CLUSTER='lab1=https://11.11.11.111:2380,lab2=https://11.11.11.112:2380,lab3=https://11.11.11.113:2380' mkdir -pv /data/etcd cat > /etc/systemd/system/etcd.service <<EOF [Unit] Description=Etcd Server After=network.target After=network-online.target Wants=network-online.target Documentation=https://github.com/coreos [Service] Type=notify WorkingDirectory=/data/etcd EnvironmentFile=-/etc/etcd/etcd.conf ExecStart=/usr/local/etcd/bin/etcd \\ --name ${ETCD_NAME} \\ --cert-file=/etc/etcd/ssl/etcd.pem \\ --key-file=/etc/etcd/ssl/etcd-key.pem \\ --peer-cert-file=/etc/etcd/ssl/etcd.pem \\ --peer-key-file=/etc/etcd/ssl/etcd-key.pem \\ --trusted-ca-file=/etc/etcd/ssl/etcd-ca.pem \\ --peer-trusted-ca-file=/etc/etcd/ssl/etcd-ca.pem \\ --initial-advertise-peer-urls https://${INTERNAL_IP}:2380 \\ --listen-peer-urls https://${INTERNAL_IP}:2380 \\ --listen-client-urls https://${INTERNAL_IP}:2379,https://127.0.0.1:2379 \\ --advertise-client-urls https://${INTERNAL_IP}:2379 \\ --initial-cluster-token my-etcd-token \\ --initial-cluster $ECTD_CLUSTER \\ --initial-cluster-state new \\ --data-dir=/data/etcd Restart=on-failure RestartSec=5 LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF # 启动并设置开机启动 systemctl daemon-reload systemctl start etcd systemctl enable etcd 复制代码

查看etcd集群状态

/usr/local/etcd/bin/etcdctl --endpoints "https://127.0.0.1:2379" \ --ca-file=/etc/etcd/ssl/etcd-ca.pem \ --cert-file=/etc/etcd/ssl/etcd.pem \ --key-file=/etc/etcd/ssl/etcd-key.pem \ cluster-health 复制代码

生成k8s集群的CA

# 进入相关目录 cd $HOME/ssl # 配置 root ca cat >ca-csr.json<<EOF { "CN": "kubernetes", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "k8s", "OU": "System" } ], "ca": { "expiry": "87600h" } } EOF # 生成 root ca cfssl gencert -initca ca-csr.json | cfssljson -bare ca ls ca*.pem # 配置 kube-apiserver ca # 10.96.0.1 是 kube-apiserver 指定的 service-cluster-ip-range 网段的第一个IP cat >kube-apiserver-csr.json<<EOF { "CN": "kube-apiserver", "hosts": [ "127.0.0.1", "11.11.11.111", "11.11.11.112", "11.11.11.113", "10.96.0.1", "kubernetes", "kubernetes.default", "kubernetes.default.svc", "kubernetes.default.svc.cluster", "kubernetes.default.svc.cluster.local" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "k8s", "OU": "System" } ] } EOF # 生成 kube-apiserver ca cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json \ -profile=kubernetes kube-apiserver-csr.json | cfssljson -bare kube-apiserver ls kube-apiserver*.pem # 配置 kube-controller-manager ca cat >kube-controller-manager-csr.json<<EOF { "CN": "system:kube-controller-manager", "hosts": [ "127.0.0.1", "11.11.11.111", "11.11.11.112", "11.11.11.113" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "system:kube-controller-manager", "OU": "System" } ] } EOF # 生成 kube-controller-manager ca cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json \ -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager ls kube-controller-manager*.pem # 配置 kube-scheduler ca cat >kube-scheduler-csr.json<<EOF { "CN": "system:kube-scheduler", "hosts": [ "127.0.0.1", "11.11.11.111", "11.11.11.112", "11.11.11.113" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "system:kube-scheduler", "OU": "System" } ] } EOF # 生成 kube-scheduler ca cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json \ -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler ls kube-scheduler*.pem # 配置 kube-proxy ca cat >kube-proxy-csr.json<<EOF { "CN": "system:kube-proxy", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "system:kube-proxy", "OU": "System" } ] } EOF # 生成 kube-proxy ca cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json \ -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy ls kube-proxy*.pem # 配置 admin ca cat >admin-csr.json<<EOF { "CN": "admin", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "system:masters", "OU": "System" } ] } EOF # 生成 admin ca cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json \ -profile=kubernetes admin-csr.json | cfssljson -bare admin ls admin*.pem # 复制生成的ca mkdir -pv /etc/kubernetes/pki cp ca*.pem admin*.pem kube-proxy*.pem kube-scheduler*.pem kube-controller-manager*.pem kube-apiserver*.pem /etc/kubernetes/pki cd /etc/kubernetes && tar cvzf pki.tgz pki/ scp /etc/kubernetes/pki.tgz lab2:~/ scp /etc/kubernetes/pki.tgz lab3:~/ ssh lab2 'mkdir -pv /etc/kubernetes && tar xf pki.tgz -C /etc/kubernetes && ls -l /etc/kubernetes/pki' ssh lab3 'mkdir -pv /etc/kubernetes && tar xf pki.tgz -C /etc/kubernetes && ls -l /etc/kubernetes/pki' cd $HOME 复制代码

安装k8s文件

# 下载文件 # 需要翻墙，如果不能翻墙使用如下链接下载 # 链接：https://pan.baidu.com/s/1OI9Q4BRp7jNJUmsA8IAkbA 密码：tnx5 cd /server/software/k8s wget https://dl.k8s.io/v1.11.0/kubernetes-server-linux-amd64.tar.gz tar xf kubernetes-server-linux-amd64.tar.gz cd kubernetes/server/bin mkdir -pv /usr/local/kubernetes-v1.11.0/bin cp kube-apiserver kube-controller-manager kube-scheduler kube-proxy kubelet kubectl /usr/local/kubernetes-v1.11.0/bin ln -sv /usr/local/kubernetes-v1.11.0 /usr/local/kubernetes cp /usr/local/kubernetes/bin/kubectl /usr/local/bin/kubectl kubectl version cd $HOME 复制代码

生成kubeconfig

# 使用 TLS Bootstrapping export BOOTSTRAP_TOKEN=$(head -c 16 /dev/urandom | od -An -t x | tr -d ' ') cat > /etc/kubernetes/token.csv <<EOF ${BOOTSTRAP_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap" EOF # 创建 kubelet bootstrapping kubeconfig cd /etc/kubernetes export KUBE_APISERVER="https://11.11.11.111:6443" kubectl config set-cluster kubernetes \ --certificate-authority=/etc/kubernetes/pki/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=kubelet-bootstrap.conf kubectl config set-credentials kubelet-bootstrap \ --token=${BOOTSTRAP_TOKEN} \ --kubeconfig=kubelet-bootstrap.conf kubectl config set-context default \ --cluster=kubernetes \ --user=kubelet-bootstrap \ --kubeconfig=kubelet-bootstrap.conf kubectl config use-context default --kubeconfig=kubelet-bootstrap.conf # 创建 kube-controller-manager kubeconfig export KUBE_APISERVER="https://11.11.11.111:6443" kubectl config set-cluster kubernetes \ --certificate-authority=/etc/kubernetes/pki/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=kube-controller-manager.conf kubectl config set-credentials kube-controller-manager \ --client-certificate=/etc/kubernetes/pki/kube-controller-manager.pem \ --client-key=/etc/kubernetes/pki/kube-controller-manager-key.pem \ --embed-certs=true \ --kubeconfig=kube-controller-manager.conf kubectl config set-context default \ --cluster=kubernetes \ --user=kube-controller-manager \ --kubeconfig=kube-controller-manager.conf kubectl config use-context default --kubeconfig=kube-controller-manager.conf # 创建 kube-scheduler kubeconfig export KUBE_APISERVER="https://11.11.11.111:6443" kubectl config set-cluster kubernetes \ --certificate-authority=/etc/kubernetes/pki/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=kube-scheduler.conf kubectl config set-credentials kube-scheduler \ --client-certificate=/etc/kubernetes/pki/kube-scheduler.pem \ --client-key=/etc/kubernetes/pki/kube-scheduler-key.pem \ --embed-certs=true \ --kubeconfig=kube-scheduler.conf kubectl config set-context default \ --cluster=kubernetes \ --user=kube-scheduler \ --kubeconfig=kube-scheduler.conf kubectl config use-context default --kubeconfig=kube-scheduler.conf # 创建 kube-proxy kubeconfig export KUBE_APISERVER="https://11.11.11.111:6443" kubectl config set-cluster kubernetes \ --certificate-authority=/etc/kubernetes/pki/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=kube-proxy.conf kubectl config set-credentials kube-proxy \ --client-certificate=/etc/kubernetes/pki/kube-proxy.pem \ --client-key=/etc/kubernetes/pki/kube-proxy-key.pem \ --embed-certs=true \ --kubeconfig=kube-proxy.conf kubectl config set-context default \ --cluster=kubernetes \ --user=kube-proxy \ --kubeconfig=kube-proxy.conf kubectl config use-context default --kubeconfig=kube-proxy.conf # 创建 admin kubeconfig export KUBE_APISERVER="https://11.11.11.111:6443" kubectl config set-cluster kubernetes \ --certificate-authority=/etc/kubernetes/pki/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=admin.conf kubectl config set-credentials admin \ --client-certificate=/etc/kubernetes/pki/admin.pem \ --client-key=/etc/kubernetes/pki/admin-key.pem \ --embed-certs=true \ --kubeconfig=admin.conf kubectl config set-context default \ --cluster=kubernetes \ --user=admin \ --kubeconfig=admin.conf kubectl config use-context default --kubeconfig=admin.conf # 把 kube-proxy.conf 复制到其他节点 scp kubelet-bootstrap.conf kube-proxy.conf lab2:/etc/kubernetes scp kubelet-bootstrap.conf kube-proxy.conf lab3:/etc/kubernetes cd $HOME 复制代码

配置master相关组件

只在lab1节点操作

配置启动kube-apiserver

# 复制 etcd ca mkdir -pv /etc/kubernetes/pki/etcd cd /etc/etcd/ssl cp etcd-ca.pem etcd-key.pem etcd.pem /etc/kubernetes/pki/etcd # 生成 service account key openssl genrsa -out /etc/kubernetes/pki/sa.key 2048 openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub ls /etc/kubernetes/pki/sa.* cd $HOME # 启动文件 cat >/etc/systemd/system/kube-apiserver.service<<EOF [Unit] Description=Kubernetes API Service Documentation=https://github.com/kubernetes/kubernetes After=network.target [Service] EnvironmentFile=-/etc/kubernetes/config EnvironmentFile=-/etc/kubernetes/apiserver ExecStart=/usr/local/kubernetes/bin/kube-apiserver \\ \$KUBE_LOGTOSTDERR \\ \$KUBE_LOG_LEVEL \\ \$KUBE_ETCD_ARGS \\ \$KUBE_API_ADDRESS \\ \$KUBE_SERVICE_ADDRESSES \\ \$KUBE_ADMISSION_CONTROL \\ \$KUBE_APISERVER_ARGS Restart=on-failure Type=notify LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF # 该配置文件同时被 kube-apiserver, kube-controller-manager # kube-scheduler, kubelet, kube-proxy 使用 cat >/etc/kubernetes/config<<EOF KUBE_LOGTOSTDERR="--logtostderr=true" KUBE_LOG_LEVEL="--v=2" EOF cat >/etc/kubernetes/apiserver<<EOF KUBE_API_ADDRESS="--advertise-address=11.11.11.111" KUBE_ETCD_ARGS="--etcd-servers=https://11.11.11.111:2379,https://11.11.11.112:2379,https://11.11.11.113:2379 --etcd-cafile=/etc/kubernetes/pki/etcd/etcd-ca.pem --etcd-certfile=/etc/kubernetes/pki/etcd/etcd.pem --etcd-keyfile=/etc/kubernetes/pki/etcd/etcd-key.pem" KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.96.0.0/12" KUBE_ADMISSION_CONTROL="--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota" KUBE_APISERVER_ARGS="--allow-privileged=true --authorization-mode=Node,RBAC --enable-bootstrap-token-auth=true --token-auth-file=/etc/kubernetes/token.csv --service-node-port-range=30000-32767 --tls-cert-file=/etc/kubernetes/pki/kube-apiserver.pem --tls-private-key-file=/etc/kubernetes/pki/kube-apiserver-key.pem --client-ca-file=/etc/kubernetes/pki/ca.pem --service-account-key-file=/etc/kubernetes/pki/sa.pub --enable-swagger-ui=true --secure-port=6443 --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname --anonymous-auth=false --kubelet-client-certificate=/etc/kubernetes/pki/admin.pem --kubelet-client-key=/etc/kubernetes/pki/admin-key.pem" EOF # 启动 systemctl daemon-reload systemctl enable kube-apiserver systemctl start kube-apiserver systemctl status kube-apiserver # 浏览器访问测试 https://11.11.11.111:6443/swaggerapi 复制代码

配置启动kube-controller-manager

# 启动文件 cat >/etc/systemd/system/kube-controller-manager.service<<EOF Description=Kubernetes Controller Manager Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/etc/kubernetes/config EnvironmentFile=-/etc/kubernetes/controller-manager ExecStart=/usr/local/kubernetes/bin/kube-controller-manager \\ \$KUBE_LOGTOSTDERR \\ \$KUBE_LOG_LEVEL \\ \$KUBECONFIG \\ \$KUBE_CONTROLLER_MANAGER_ARGS Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF cat >/etc/kubernetes/controller-manager<<EOF KUBECONFIG="--kubeconfig=/etc/kubernetes/kube-controller-manager.conf" KUBE_CONTROLLER_MANAGER_ARGS="--address=127.0.0.1 --cluster-cidr=10.244.0.0/16 --cluster-name=kubernetes --cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem --cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem --service-account-private-key-file=/etc/kubernetes/pki/sa.key --root-ca-file=/etc/kubernetes/pki/ca.pem --leader-elect=true --use-service-account-credentials=true --node-monitor-grace-period=10s --pod-eviction-timeout=10s --allocate-node-cidrs=true --controllers=*,bootstrapsigner,tokencleaner" EOF # 启动 systemctl daemon-reload systemctl enable kube-controller-manager systemctl start kube-controller-manager systemctl status kube-controller-manager 复制代码

配置启动kube-scheduler

cat >/etc/systemd/system/kube-scheduler.service<<EOF [Unit] Description=Kubernetes Scheduler Plugin Documentation=https://github.com/kubernetes/kubernetes [Service] EnvironmentFile=-/etc/kubernetes/config EnvironmentFile=-/etc/kubernetes/scheduler ExecStart=/usr/local/kubernetes/bin/kube-scheduler \\ \$KUBE_LOGTOSTDERR \\ \$KUBE_LOG_LEVEL \\ \$KUBECONFIG \\ \$KUBE_SCHEDULER_ARGS Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF cat >/etc/kubernetes/scheduler<<EOF KUBECONFIG="--kubeconfig=/etc/kubernetes/kube-scheduler.conf" KUBE_SCHEDULER_ARGS="--leader-elect=true --address=127.0.0.1" EOF # 启动 systemctl daemon-reload systemctl enable kube-scheduler systemctl start kube-scheduler systemctl status kube-scheduler 复制代码

配置kubectl使用

rm -rf $HOME/.kube mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config kubectl get no 复制代码

查看组件状态

kubectl get componentstatuses 复制代码

配置kubelet使用bootstrap

# 将 bootstrap token 文件中的 kubelet-bootstrap 用户赋予 system:node-bootstrapper cluster 角色 kubectl create clusterrolebinding kubelet-bootstrap \ --clusterrole=system:node-bootstrapper \ --user=kubelet-bootstrap 复制代码

配置node相关组件

如下操作在所有节点操作

安装cni

# 安装 cni # 百度云链接：https://pan.baidu.com/s/1-PputObLs5jouXLnuBCI6Q 密码：tzqm cd /server/software/k8s wget https://github.com/containernetworking/plugins/releases/download/v0.7.1/cni-plugins-amd64-v0.7.1.tgz mkdir -pv /opt/cni/bin tar xf cni-plugins-amd64-v0.7.1.tgz -C /opt/cni/bin ls -l /opt/cni/bin cd $HOME 复制代码

配置启动kubelet

# 启动文件 mkdir -pv /data/kubelet cat >/etc/systemd/system/kubelet.service<<EOF [Unit] Description=Kubernetes Kubelet Server Documentation=https://github.com/kubernetes/kubernetes After=docker.service Requires=docker.service [Service] WorkingDirectory=/data/kubelet EnvironmentFile=-/etc/kubernetes/config EnvironmentFile=-/etc/kubernetes/kubelet ExecStart=/usr/local/kubernetes/bin/kubelet \\ \$KUBE_LOGTOSTDERR \\ \$KUBE_LOG_LEVEL \\ \$KUBELET_CONFIG \\ \$KUBELET_HOSTNAME \\ \$KUBELET_POD_INFRA_CONTAINER \\ \$KUBELET_ARGS Restart=on-failure [Install] WantedBy=multi-user.target EOF cat >/etc/kubernetes/config<<EOF KUBE_LOGTOSTDERR="--logtostderr=true" KUBE_LOG_LEVEL="--v=2" EOF # 注意修改相关ip cat >/etc/kubernetes/kubelet<<EOF KUBELET_HOSTNAME="--hostname-override=11.11.11.111" KUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1" KUBELET_CONFIG="--config=/etc/kubernetes/kubelet-config.yml" KUBELET_ARGS="--bootstrap-kubeconfig=/etc/kubernetes/kubelet-bootstrap.conf --kubeconfig=/etc/kubernetes/kubelet.conf --cert-dir=/etc/kubernetes/pki --network-plugin=cni --cni-bin-dir=/opt/cni/bin --cni-conf-dir=/etc/cni/net.d" EOF # 注意修改相关ip # lab1 lab2 lab3 使用各自ip cat >/etc/kubernetes/kubelet-config.yml<<EOF kind: KubeletConfiguration apiVersion: kubelet.config.k8s.io/v1beta1 address: 11.11.11.111 port: 10250 cgroupDriver: cgroupfs clusterDNS: - 10.96.0.10 clusterDomain: cluster.local. hairpinMode: promiscuous-bridge serializeImagePulls: false authentication: x509: clientCAFile: /etc/kubernetes/pki/ca.pem EOF # 启动 systemctl daemon-reload systemctl enable kubelet systemctl start kubelet systemctl status kubelet 复制代码

通过证书请求

# 在配置了kubectl的节点上执行如下操作 # 查看 kubectl get csr # 通过 kubectl certificate approve node-csr-Yiiv675wUCvQl3HH11jDr0cC9p3kbrXWrxvG3EjWGoE # 查看节点 # 此时节点状态为 NotReady kubectl get nodes # 在node节点查看生成的文件 ls -l /etc/kubernetes/kubelet.conf ls -l /etc/kubernetes/pki/kubelet* 复制代码

配置启动kube-proxy

# 安装 yum install -y conntrack-tools # 启动文件 cat >/etc/systemd/system/kube-proxy.service<<EOF [Unit] Description=Kubernetes Kube-Proxy Server Documentation=https://github.com/kubernetes/kubernetes After=network.target [Service] EnvironmentFile=-/etc/kubernetes/config EnvironmentFile=-/etc/kubernetes/proxy ExecStart=/usr/local/kubernetes/bin/kube-proxy \\ \$KUBE_LOGTOSTDERR \\ \$KUBE_LOG_LEVEL \\ \$KUBECONFIG \\ \$KUBE_PROXY_ARGS Restart=on-failure LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF # 注意修改相关ip # lab1 lab2 lab3 使用各自ip # 由于 1.11.0 ipvs 在centos7上有bug无法正常使用 # 实验使用 iptables 模式 # 以后版本可以使用 ipvs 模式 cat >/etc/kubernetes/proxy<<EOF KUBECONFIG="--kubeconfig=/etc/kubernetes/kube-proxy.conf" KUBE_PROXY_ARGS="--bind-address=11.11.11.111 --proxy-mode=iptables --hostname-override=11.11.11.111 --cluster-cidr=10.244.0.0/16" EOF # 启动 systemctl daemon-reload systemctl enable kube-proxy systemctl start kube-proxy systemctl status kube-proxy 复制代码

设置集群角色

# 设置 lab1 为 master kubectl label nodes 11.11.11.111 node-role.kubernetes.io/master= # 设置 lab2 lab3 为 node kubectl label nodes 11.11.11.112 node-role.kubernetes.io/node= kubectl label nodes 11.11.11.113 node-role.kubernetes.io/node= # 设置 master 一般情况下不接受负载 kubectl taint nodes 11.11.11.111 node-role.kubernetes.io/master=true:NoSchedule # 查看节点 # 此时节点状态为 NotReady kubectl get no 复制代码

配置使用flannel网络

在lab1操作

# 下载配置 mkdir flannel && cd flannel wget https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml # 修改配置 # 此处的ip配置要与上面kubeadm的pod-network一致 net-conf.json: | { "Network": "10.244.0.0/16", "Backend": { "Type": "vxlan" } } # 修改镜像 image: registry.cn-shanghai.aliyuncs.com/gcr-k8s/flannel:v0.10.0-amd64 # 如果Node有多个网卡的话，参考flannel issues 39701， # https://github.com/kubernetes/kubernetes/issues/39701 # 目前需要在kube-flannel.yml中使用--iface参数指定集群主机内网网卡的名称， # 否则可能会出现dns无法解析。容器无法通信的情况，需要将kube-flannel.yml下载到本地， # flanneld启动参数加上--iface=<iface-name> containers: - name: kube-flannel image: registry.cn-shanghai.aliyuncs.com/gcr-k8s/flannel:v0.10.0-amd64 command: - /opt/bin/flanneld args: - --ip-masq - --kube-subnet-mgr - --iface=eth1 # 启动 kubectl apply -f kube-flannel.yml # 查看 kubectl get pods -n kube-system kubectl get svc -n kube-system # 查看节点状态 # 当 flannel pod 全部启动之后，节点状态为 Ready kubectl get no 复制代码

配置使用coredns

在lab1操作

# 安装 # 10.96.0.10 kubelet中配置的dns cd $HOME && mkdir coredns && cd coredns wget https://raw.githubusercontent.com/coredns/deployment/master/kubernetes/coredns.yaml.sed wget https://raw.githubusercontent.com/coredns/deployment/master/kubernetes/deploy.sh chmod +x deploy.sh ./deploy.sh -i 10.96.0.10 > coredns.yml kubectl apply -f coredns.yml # 查看 kubectl get pods -n kube-system kubectl get svc -n kube-system 复制代码

测试

启动

kubectl run nginx --replicas=2 --image=nginx:alpine --port=80 kubectl expose deployment nginx --type=NodePort --name=example-service-nodeport kubectl expose deployment nginx --name=example-service kubectl scale --replicas=3 deployment/nginx 复制代码

查看状态

kubectl get deploy -o wide kubectl get pods -o wide kubectl get svc -o wide kubectl describe svc example-service 复制代码

DNS解析

kubectl run curl --image=radial/busyboxplus:curl -i --tty nslookup kubernetes nslookup example-service curl example-service 复制代码

访问测试

# 10.96.59.56 为查看svc时获取到的clusterip curl "10.107.91.153:80" # 32223 为查看svc时获取到的 nodeport http://11.11.11.111:32223/ http://11.11.11.112:32223/ http://11.11.11.113:32223/ 复制代码

清理

kubectl delete svc example-service example-service-nodeport kubectl delete deploy nginx curl

本文转自掘金- centos7纯手动安装kubernetes-v1.11版本