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#!/bin/bash
# kubeadm安装k8s
# ***需要设置所有主机的主机名***
# 安装所需的基本环境

# cat <<EOF >> /etc/hosts
# 10.100.5.100 k8s-master-01
# 10.100.5.101 k8s-master-02
# 10.100.5.102 k8s-master-03
# 10.100.5.35 k8s-node-01
# 10.100.5.36 k8s-node-02
# 10.100.5.37 k8s-node-03
# 10.100.5.38 k8s-node-04
# 10.100.5.39 k8s-node-05
# 10.100.3.158 k8s-node-06
# EOF


K8S_VERSION=1.22.3
CRICTL_VERSION=1.22.0
# https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.22.0/crictl-v1.22.0-linux-amd64.tar.gz
CRICTL_ADDR=http://nas.hardhtml.com:8800/linux/crictl-v${CRICTL_VERSION}-linux-amd64.tar.gz


# 关闭swap
sed -i 's/^[^#].*swap*/#&/g' /etc/fstab
swapoff -a

# 关闭防火墙和selinux
systemctl disable firewalld && systemctl stop firewalld
sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
setenforce 0

# 清空规则
iptables -F

# 安装nfs-utils
yum install -y nfs-utils

# 安装ntp服务
yum install -y ntp
systemctl start ntpd && systemctl enable ntpd

# 调整系统时区
systemctl restart rsyslog
systemctl restart crond


# 安装containerd
# yum remove -y docker*
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
# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install -y containerd.io-1.4.11
containerd config default > /etc/containerd/config.toml

# 设置参数优化
sed -i "s#k8s.gcr.io#registry.cn-hangzhou.aliyuncs.com/google_containers#g"  /etc/containerd/config.toml
sed -i '/containerd.runtimes.runc.options/a\ \ \ \ \ \ \ \ \ \ \ \ SystemdCgroup = true' /etc/containerd/config.toml
sed -i "s#https://registry-1.docker.io#https://registry.cn-hangzhou.aliyuncs.com#g"  /etc/containerd/config.toml

cat <<EOF > /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF
modprobe overlay
modprobe br_netfilter
systemctl enable containerd && systemctl restart containerd


# 安装crictl
if [ -e '/usr/bin/crictl' ];then
  mv /usr/bin/crictl /tmp/
fi

wget $CRICTL_ADDR -P /opt/
tar -zxvf /opt/crictl-v${CRICTL_VERSION}-linux-amd64.tar.gz -C /usr/bin/
cat << EOF > /etc/crictl.yaml
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 10
debug: false
EOF
crictl --version


# 设置k8s内核参数
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF

# 加载内核参数
modprobe br_netfilter
sysctl --system
sysctl -p /etc/sysctl.d/k8s.conf


# kube-proxy开启ipvs的前置条件
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
# 脚本创建了的/etc/sysconfig/modules/ipvs.modules文件，保证在节点重启后能自动加载所需模块。 使用lsmod | grep -e ip_vs -e nf_conntrack_ipv4命令查看是否已经正确加载所需的内核模块
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack_ipv4
yum install ipvsadm ipset -y



# 添加阿里云kubernetes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

# 安装kubelet,kubeadm,kubectl
yum install -y kubelet-${K8S_VERSION} kubeadm-${K8S_VERSION} kubectl-${K8S_VERSION} && systemctl enable kubelet