系统初始化：

设置主机名
hostnamectl set-hostname k8s-master001



mkdir /etc/yum.repos.d/bak
mv /etc/yum.repos.d/Cent* /etc/yum.repos.d/bak/
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

# 安装依赖包
yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wgetvimnet-tools git

swapoff -a && sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config



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
systemctl stop postfix && systemctl disable postfix




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




rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install -y kernel-lt
grub2-set-default 0
reboot
# 删除旧的内核，删除旧内核的目的是为了防止 yum 更新旧版内核之后覆盖了 grub 默认启动项
yum -y remove kernel kernel-tools

kubeadm 部署

docker 安装

yum install -y yum-utils device-mapper-persistent-data lvm2


### 新增 Docker 仓库
yum-config-manager \
--add-repo \
http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo



## 安装 Docker CE.
yum update && yum -y install docker-ce-18.06.2.ce


## 创建 /etc/docker 目录。
mkdir /etc/docker




# 设置 daemon。
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"
  ]
}
EOF


mkdir -p /etc/systemd/system/docker.service.d
# 重启 Docker
systemctl daemon-reload
c

集群部署

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 install -y kubelet kubeadm kubectl --disableexcludes=kubernetes

systemctl enable --now kubelet

# 查看初始化默认配置
kubeadm config print init-defaults > kubeadm-config.yaml

kubeadm init --kubernetes-version=v1.18.1  \
--apiserver-advertise-address=172.16.5.30   \
--image-repository registry.aliyuncs.com/google_containers  \
--service-cidr=10.96.0.0/12 --pod-network-cidr=10.244.0.0/16 | tee kubeadm-init.log

节点加入集群

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

# 根据提示加入
kubeadm join 172.16.5.30:6443 --token hjqed5.0ueiyniog0pzls6p \
    --discovery-token-ca-cert-hash sha256:c54d339dad7b57d7e1a2e9b5a0aded876b16a4e1eae4be1848f4d38864e804fa 

# 此时通过kubectl get node 状态是notready，需要安装网络插件 flannel
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

取消污点，允许master部署pod

kubectl taint nodes --all node-role.kubernetes.io/master-

禁止master部署pod

kubectl taint nodes k8s node-role.kubernetes.io/master=true:NoSchedule

kubectl taint nodes k8s kubernetes.io/hostname=k8s-master001