前言

Kubernetes简称k8s，是一个开源的，用于管理云平台中多个主机上的容器化的应用，k8s目标是让部署容器化的应用简单并且高效，k8s提供了应用部署，规划，更新，维护的一种机制。
本文是总结了在安装k8s过程中详细步骤。

Master节点安装

环境信息

• 虚机配置2核4G以上
• 可访问外网
• 操作系统CentOS 7.6 x86架构的

系统工具及安全配置

安装常用系统工具

yum install -y nfs-utils wget

关闭防火墙

firewall-cmd --state          # 查看防火墙状态
systemctl stop firewalld      # 停止防火墙的服务
systemctl disable firewalld   # 禁止开机启动

关闭 SeLinux

setenforce 0
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config

# 查看是否成功 
sestatus -v

SELinux status:                 disabled

关闭 swap

swapoff -a

# 将/etc/fstab文件中的Swap注释掉
yes | cp /etc/fstab /etc/fstab_bak
cat /etc/fstab_bak |grep -v swap > /etc/fstab
rm -rf /etc/fstab_bak

修改启动网络参数配置

# 修改 /etc/sysctl.conf
# 如果有配置，则修改
sed -i "s#^net.ipv4.ip_forward.*#net.ipv4.ip_forward=1#g"  /etc/sysctl.conf
sed -i "s#^net.bridge.bridge-nf-call-ip6tables.*#net.bridge.bridge-nf-call-ip6tables=1#g"  /etc/sysctl.conf
sed -i "s#^net.bridge.bridge-nf-call-iptables.*#net.bridge.bridge-nf-call-iptables=1#g"  /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.all.disable_ipv6.*#net.ipv6.conf.all.disable_ipv6=1#g"  /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.default.disable_ipv6.*#net.ipv6.conf.default.disable_ipv6=1#g"  /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.lo.disable_ipv6.*#net.ipv6.conf.lo.disable_ipv6=1#g"  /etc/sysctl.conf
sed -i "s#^net.ipv6.conf.all.forwarding.*#net.ipv6.conf.all.forwarding=1#g"  /etc/sysctl.conf
# 可能没有，追加
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.conf
echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.lo.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.all.forwarding = 1"  >> /etc/sysctl.conf
# 执行命令以应用
sysctl -p

Docker环境安装

卸载历史的docker软件（如果不需要直接跳过）

yum remove -y docker \
docker-client \
docker-client-latest \
docker-ce-cli \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-selinux \
docker-engine-selinux \
docker-engine

设置 docker 的 yum 源

# 设置 yum repository
yum install -y yum-utils \
device-mapper-persistent-data \
lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

安装最新版本的docker

yum install -y docker-ce docker-ce-cli containerd.io
mkdir /etc/docker || true
cat > /etc/docker/daemon.json <<EOF
{
  "registry-mirrors": ["https://registry.cn-hangzhou.aliyuncs.com"],
  "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

k8s安装

配置k8s的yum源

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

卸载旧版本的kubectl相关软件

yum remove -y kubelet kubeadm kubectl

安装kubelet、kubeadm、kubectl

# 将 ${xxx} 替换为 kubernetes 版本号，例如 1.19.0
yum install -y kubelet-${xxx} kubeadm-${xxx} kubectl-${xxx}

重启 docker，并启动 kubelet

systemctl daemon-reload
systemctl restart docker
systemctl enable kubelet && systemctl start kubelet
docker version

k8s 初始化

拉取 k8s 所需要的镜像

images=(
kube-apiserver:v1.23.5
kube-controller-manager:v1.23.5
kube-scheduler:v1.23.5
kube-proxy:v1.23.5
pause:3.6
etcd:3.5.1-0
coredns:v1.8.6
)

for imageName in ${images[@]}; do
  echo ${imageName}
  docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName
  docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
  docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName
done

docker tag k8s.gcr.io/coredns:v1.8.6 k8s.gcr.io/coredns/coredns:v1.8.6

docker rmi k8s.gcr.io/coredns:v1.8.6

Master 节点初始化

kubeadm config images list
docker tag k8s.gcr.io/coredns:v1.8.6 k8s.gcr.io/coredns/coredns:v1.8.6
docker rmi k8s.gcr.io/coredns:v1.8.6

kubeadm init --apiserver-advertise-address 10.253.128.30 --kubernetes-version 1.23.5 --pod-network-cidr 10.244.0.0/16

slave 节点初始化

kubeadm join 10.253.128.30:6443 --token 9ubdhc.ylpx8i9pygp2fbka \
	--discovery-token-ca-cert-hash sha256:e89d0cab39a57a5addfb53f59e91b412f7035533f73e6c389f87beed4d4c3050

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