K8S云计算系列-(2)

1.Kubernetes平台配置实战

部署Kubernetes云计算平台，至少准备两台服务器，服务器CPU至少2C，内存4G，环境如下所示：

Kubernetes Master节点：192.168.1.146
Kubernetes Minion节点：192.168.1.147

2. K8S节点Hosts及防火墙设置

master1、node1节点进行如下配置：

#添加hosts解析；
cat >/etc/hosts<<EOF
127.0.0.1 localhost localhost.localdomain
192.168.1.146 master1
192.168.1.147 node1
EOF
#临时关闭selinux和防火墙；
sed -i '/SELINUX/s/enforcing/disabled/g'  /etc/sysconfig/selinux
setenforce  0
systemctl   stop     firewalld.service
systemctl   disable   firewalld.service
#同步节点时间；
yum install ntpdate -y
ntpdate  pool.ntp.org
#修改对应节点主机名；
hostname `cat /etc/hosts|grep $(ifconfig|grep broadcast|awk '{print $2}')|awk '{print $2}'`;su
#关闭swapoff；
swapoff -a

3. Linux内核参数设置&优化

cat > /etc/modules-load.d/ipvs.conf <<EOF
# Load IPVS at boot
ip_vs
ip_vs_rr
ip_vs_wrr
ip_vs_sh
nf_conntrack_ipv4
EOF
systemctl enable --now systemd-modules-load.service
#确认内核模块加载成功
lsmod | grep -e ip_vs -e nf_conntrack_ipv4
#安装ipset、ipvsadm
yum install -y ipset ipvsadm
#配置内核参数;
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system

4. Docker虚拟化案例实战

# 安装依赖软件包
yum install -y yum-utils device-mapper-persistent-data lvm2
# 添加Docker repository，这里使用国内阿里云yum源
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# 安装docker-ce，这里直接安装最新版本
yum install -y docker-ce
#修改docker配置文件
mkdir /etc/docker
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"
  ],
  "registry-mirrors": ["https://uyah70su.mirror.aliyuncs.com"]
}
EOF
# 注意，由于国内拉取镜像较慢，配置文件最后增加了registry-mirrors
mkdir -p /etc/systemd/system/docker.service.d
# 重启docker服务
systemctl daemon-reload
systemctl enable docker.service
systemctl start docker.service
ps -ef|grep -aiE docker

5. Kubernetes添加部署源

Kubernetes Master节点上安装Docker、Etcd和Kubernetes、Flannel网络，添加kubernetes源指令如下：

cat>>/etc/yum.repos.d/kubernetes.repo<<EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
EOF