k8s 1.15.1 集群安装

k8s 集群安装

1）初始化：

每台机器上均需要执行

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

# 关闭防火墙 安装，清空 iptables
systemctl stop firewalld && systemctl disable firewalld
yum -y install iptables-services && systemctl start iptables && systemctl enable ipstables && iptables -F && service iptables save

# 关闭虚拟内存
swapoff -a && sed -i '/ swap / s/^(.*)$/#1/g' /etc/fstab

# 关闭 Selinux
setenforce 0 && sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config


# 调整内核参数，对于k8s
cat > k8s.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
vm.overcommit_memory=1
vm.panic_on_oom=0
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
EOF
cp k8s.conf /etc/sysctl.d/k8s.conf
sysctl -p /etc/sysctl.d/k8s.conf


# 设置 rsyslogd 和 systemd journald
# 持久化保存日志的目录
mkdir /var/log/journal
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

# 单个日志文件最大 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

升级内核为 4.44

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)"

kube-proxy开启ipvs的前置条件

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

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

#  也可以通过以下命令下载指定docker版本
export VERSION=18.09 && curl -sSL get.docker.com | sh

systemctl start docker

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
systemctl daemon-reload && systemctl restart docker && systemctl enable docker

安装 Kubeadm （主从配置）

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://mirros.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

初始化主节点

# 需要拉取kubernetes的docker镜像
# 生成kubeadm配置文件，修改配置文件里的images下载源、是否允许Master允许业务Pod、网络配置信息
kubeadm config print init-defaults > kubeadm.conf

vi kubeadm.conf
//修改默认kubeadm初始化参数如下
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kubernetesVersion: v1.15.1
nodeRegistration:
  taints:
  - effect: PreferNoSchedule
    key: node-role.kubernetes.io/master
localAPIEndpoint:
  advertiseAddress: 10.10.10.10   # 这里甜master节点ip
networking:
  dnsDomain: cluster.local
  podSubnet: 192.168.0.0/16
  serviceSubnet: 172.18.0.0/16


# 使用自定义配置拉取 images
kubeadm config images pull --config kubeadm.conf


# 修改pull images的tag
# 从国内镜像网站下载的Images需要re tag到k8s.gcr.io
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.1 k8s.gcr.io/kube-scheduler:v1.15.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.15.1

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.1 k8s.gcr.io/kube-proxy:v1.15.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.15.1

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.1 k8s.gcr.io/kube-controller-manager:v1.15.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.15.1

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.1 k8s.gcr.io/kube-apiserver:v1.15.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.15.1

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10

docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1 k8s.gcr.io/pause:3.1
docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1


# 确认 re tag 成功
docker images

## 以上全部节点都需要执行

# 部署 master 节点
# 初始化 kubeadm
kubeadm init --config /root/kubeadm.conf


# 部署网络
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

kubectl create -f kube-flannel.yml

kubectl get pod -n kube-system