Kubernetes---高可用的 K8S 集群构建

hostnamectl set-hostname k8s-master01

yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wget vim net-tools git

systemctl stop firewalld && systemctl disable firewalld 
yum -y install iptables-services && systemctl start iptables && systemctl enable iptables && iptables -F && service iptables save

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 00M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 00M 
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 
sysctl -p /etc/sysctl.d/kubernetes.conf

# 设置系统时区为中国/上海 
timedatectl set-timezone Asia/Shanghai 
#将当前的 UTC 时间写入硬件时钟 
timedatectl set-local-rtc 0
# 重启依赖于系统时间的服务 
systemctl restart rsyslog 
systemctl restart crond

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 <<E0F 
[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 
# 安装完成后检查 /boot/grub2/grub.cfg 中对应内核 menuentry 中是否包含 initrd16 配置，如果没有，再安装 一次!

yum --enablerepo=elrepo-kernel install -y kernel-lt #设置开机从新内核启动 

grub2-set-default "CentOS Linux (4.4.182-1.el7.elrepo.x86_64) 7 (Core)"

#重启后安装内核源文件 
yum --enablerepo=elrepo-kernel install kernel-lt-devel-$(uname -r) kernel-lt-headers-$(uname -r) 

cp /etc/default/grub{,.bak}
vim /etc/default/grub #在 GRUB_CMDLINE_LINUX 一行添加`numa=off`参数，如下所示:
diff /etc/default/grub.bak /etc/default/grub 
6c6 
< GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rhgb quiet"
---
> GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rhgb quiet numa=off"
cp /boot/grub2/grub.cfg{,.bak}
grub2-mkconfig -o /boot/grub2/grub.cfg

modprobe br_netfilter 
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 
chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack_ipv4

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 update -y && yum install -y docker-ce 

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

#配置 daemon.
cat > /etc/docker/daemon.json <<EOF 
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size"："100m"
  }
}  
EOF 
mkdir -p /etc/systemd/system/docker.service.d 

#重启docker服务 
systemctl daemon-reload && systemctl restart docker && systemctl enable docker

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 -y install kubeadm-1.15.1 kubectl-1.15.1 kubelet-1.15.1 
systemctl enable kubelet.service 

kubeadm config print init-defaults > kubeadm-config.yaml 
kubeadm init --config=kubeadm-config.yaml --experimental-upload-certs | tee kubeadm-init.log