安装
安装docker
Master、Node节点都需要安装
# 卸载原来的docker
sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
# 安装依赖
sudo yum update -y && sudo yum install -y yum-utils \
device-mapper-persistent-data \
lvm2
# 添加官方yum库
sudo yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
# 安装docker 安装指定版本的docker,需要kubernets支持的才行，这里安装18.9.7
# sudo yum install docker-ce docker-ce-cli containerd.io
yum install -y docker-ce-18.09.7 docker-ce-cli-18.09.7 containerd.io
# 查看docker版本
docker --version
# 开机启动
systemctl enable --now docker
或者使用脚本一件安装
curl -fsSL "https://get.docker.com/" | sh
systemctl enable --now docker
修改docker cgroup驱动，与k8s一致，使用systemd
# 修改docker cgroup驱动：native.cgroupdriver=systemd
cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"storage-opts": [
"overlay2.override_kernel_check=true"
]
# 这里可以加入下载加速的源
# "registry-mirrors": ["https://xxxxx.mirror.aliyuncs.com"]
}
EOF
systemctl restart docker # 重启使配置生效
安装 kubelet kubeadm kubectl
master、node节点都需要安装kubelet kubeadm kubectl。
安装kubernetes的时候，需要安装kubelet, kubeadm等包，但k8s官网给的yum源是packages.cloud.google.com，国内访问不了，此时我们可以使用阿里云的yum仓库镜像
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
# 关闭SElinux
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
# 安装kubelet kubeadm kubectl
yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
systemctl enable --now kubelet # 开机启动kubelet
# centos7用户还需要设置路由：
yum install -y bridge-utils.x86_64
modprobe br_netfilter # 加载br_netfilter模块，使用lsmod查看开启的模块
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system # 重新加载所有配置文件
systemctl disable --now firewalld # 关闭防火墙
# k8s要求关闭swap (qxl)
swapoff -a && sysctl -w vm.swappiness=0 # 关闭swap
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab # 取消开机挂载swap
创建集群准备工作
# Master端：
kubeadm config images pull # 拉取集群所需镜像，这个需要翻墙
# --- 不能翻墙可以尝试以下办法 ---
kubeadm config images list # 列出所需镜像 根据自己需要下载
docker pull mirrorgooglecontainers/kube-apiserver-amd64:v1.16.1
docker pull mirrorgooglecontainers/kube-controller-manager-amd64:v1.16.1
docker pull mirrorgooglecontainers/kube-scheduler-amd64:v1.16.1
docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.16.1
docker pull mirrorgooglecontainers/pause:3.1
docker pull mirrorgooglecontainers/etcd:3.3.15-0
docker pull coredns/coredns:1.6.2
# 下载完毕后打tag
docker tag mirrorgooglecontainers/kube-apiserver-amd64:v1.16.1 k8s.gcr.io/kube-apiserver:v1.16.1
docker tag mirrorgooglecontainers/kube-controller-manager-amd64:v1.16.1 k8s.gcr.io/kube-controller-manager:v1.16.1
docker tag mirrorgooglecontainers/kube-scheduler-amd64:v1.16.1 k8s.gcr.io/kube-scheduler:v1.16.1
docker tag mirrorgooglecontainers/kube-proxy-amd64:v1.16.1 k8s.gcr.io/kube-proxy:v1.16.1
docker tag mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1
docker tag mirrorgooglecontainers/etcd:3.3.15-0 k8s.gcr.io/etcd:3.3.15-0
docker tag coredns/coredns:1.6.2 k8s.gcr.io/coredns:1.6.2
# 删除原来的镜像
# Node端：
# 根据所需镜像名字先拉取国内资源
docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.16.1
docker pull mirrorgooglecontainers/pause:3.1
# 修改镜像tag
docker tag mirrorgooglecontainers/kube-proxy-amd64:v1.16.1 k8s.gcr.io/kube-proxy:v1.16.1
docker tag mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1
# 删除原来的镜像
使用kubeadm创建集群
# 第一次初始化过程中/etc/kubernetes/admin.conf该文件存在，是空文件（我自己手动创建的），会报错：panic: runtime error: invalid memory address or nil pointer dereference
ls /etc/kubernetes/admin.conf && mv /etc/kubernetes/admin.conf.bak # 移走备份
# 初始化Master（Master需要至少2核）此处会各种报错,异常...成功与否就在此
kubeadm init --apiserver-advertise-address 192.168.200.25 --pod-network-cidr 10.244.0.0/16 # --kubernetes-version 1.14.1
# --apiserver-advertise-address 指定与其它节点通信的接口
# --pod-network-cidr 指定pod网络子网，使用fannel网络必须使用这个CIDR
普通用户设置权限
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
应用flannel网络
# https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/#tabs-pod-install-4
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/2140ac876ef134e0ed5af15c65e414cf26827915/Documentation/kube-flannel.yml
使用node加入集群
kubeadm join 172.16.54.145:6443 --token ppj0ts.1x5lh80gcgj84qr1 \
--discovery-token-ca-cert-hash sha256:14fbe55aa9cbae02fc558aa9e34da44f95840133309885b5b6f8a8895f924409
查看
# master：
kubectl get pods --all-namespaces
# ---输出信息---
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-fb8b8dccf-rn8kd 1/1 Running 0 170m
kube-system coredns-fb8b8dccf-slwr4 1/1 Running 0 170m
kube-system etcd-master 1/1 Running 0 169m
kube-system kube-apiserver-master 1/1 Running 0 169m
kube-system kube-controller-manager-master 1/1 Running 0 169m
kube-system kube-flannel-ds-amd64-l8c7c 1/1 Running 0 130m
kube-system kube-flannel-ds-amd64-lcmxw 1/1 Running 1 117m
kube-system kube-flannel-ds-amd64-pqnln 1/1 Running 1 72m
kube-system kube-proxy-4kcqb 1/1 Running 0 170m
kube-system kube-proxy-jcqjd 1/1 Running 0 72m
kube-system kube-proxy-vm9sj 1/1 Running 0 117m
kube-system kube-scheduler-master 1/1 Running 0 169m
# ---输出信息---
kubectl get nodes
# ---输出信息---
NAME STATUS ROLES AGE VERSION
master Ready master 171m v1.14.1
node1 Ready <none> 118m v1.14.1
node2 Ready <none> 74m v1.14.1
# ---输出信息---
查看日志
ournalctl -f # 当前输出日志
journalctl -f -u kubelet # 只看当前的kubelet进程日志
DashBoard安装
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta4/aio/deploy/recommended.yaml