本文首发自个人博客:https://blog.smile13.com/articles/2019/01/13/1547376380025.html

环境准备(所有节点都需要操作)

1.服务器信息

server count: 7
server version: Centos7.4

2.节点规划

192.168.158.131 k8s01 etcd、Master、Node、keepalived
192.168.158.132 k8s02 etcd、Master、Node、keepalived
192.168.158.133 k8s03 etcd、Master、Node、keepalived
192.168.158.134 k8s04 node
192.168.158.135 k8s05 node
192.168.158.136 k8s06 node
192.168.158.137 k8s07 node
192.168.158.138 k8s08 k8s-cluster.smile13.com (VIP)

3.关闭防火墙

sudo systemctl stop firewalld && sudo systemctl disable firewalld

4.关闭Sexlinux

sed -i ‘/SELINUX=enforcing/d’ /etc/selinux/config
sed -i ‘/SELINUX=disabled/d’ /etc/selinux/config
echo “SELINUX=disabled” >> /etc/selinux/config
重启后生效。

5.安装ntp同步时间

# yum -y install ntp

修改配置文件/etc/ntp.conf
注释掉原有的server指向把时间服务器的域名地址指向一个靠谱可连的时间服务器,我选择的是ntp1.aliyun.com.

# vi /etc/ntp.conf
……
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst 

server ntp1.aliyun.com iburst
......

启动ntp并加入开机启动
# systemctl start ntpd
# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.

注意:在启动之前,先使用ntpdate手动同步一下时间,免得本机与对时中心时间差距太大,使得ntpd不能正常同步。这里选用ntp1.aliyun.com作为对时中心:sudo ntpdate -u ntp1.aliyun.com

6.配置ssh,实现节点见的无秘密登录

6.1生成密钥

ssh-keygen -t rsa   #输入之后一直选择enter即可。生成的秘钥位于 ~/.ssh文件夹下。可用cd 命令进入查看。

6.2 导入authorized_keys

cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

6.3 远程无密码登录(把各个主机上的authorized_keys拷贝到其他主机的相应目录下)

cat ~/.ssh/id_rsa.pub | ssh -p 22 user@host 'cat >> ~/.ssh/authorized_keys'

6.4 修改authorized_keys文件的权限(必须为600,否则不能免密码登陆)

chmod 600 ~/.ssh/authorized_keys

7.关闭swap

swapoff -a

然后再打开文件/etc/fstab,找到swap有关的一行,如下图红框所示,在这一行的最左边加上"#",将该行注释掉:
#
# /etc/fstab
# Created by anaconda on Fri Jul 20 23:01:49 2018
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=f5f7670b-9aaf-414c-8e5e-50cb33e81d48 /                       xfs     defaults        0 0
UUID=8ef45b9a-a906-40a9-a51c-af05d3d13766 /boot                   xfs     defaults        0 0
#UUID=26981930-f538-4a6f-a055-6ca7a5a51112 swap                    swap    defaults        0 0

执行free -m命令检查,swap值应该都为0了

[root@k8s01 ~]# free -m
.              total        used        free      shared  buff/cache   available
Mem:          29443         181       28985           8         276       28865
Swap:             0           0           0

8.配置ipvs支持

[root@k8s01 ~]# cat /etc/sysconfig/modules/ipvs.modules
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4

上面脚本创建了的/etc/sysconfig/modules/ipvs.modules文件,保证在节点重启后能自动加载所需模块。

查看是否已经正确加载所需的内核模块:

[root@k8s01 ~]# lsmod | grep -e ip_vs -e nf_conntrack_ipv4
nf_conntrack_ipv4      16384  2 
nf_defrag_ipv4         16384  1 nf_conntrack_ipv4
ip_vs_sh               16384  0 
ip_vs_wrr              16384  0 
ip_vs_rr               16384  0 
ip_vs                 151552  6 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack          135168  8 xt_conntrack,nf_nat_masquerade_ipv4,nf_conntrack_ipv4,nf_nat,ipt_MASQUERADE,nf_nat_ipv4,nf_conntrack_netlink,ip_vs
libcrc32c              16384  4 nf_conntrack,nf_nat,xfs,ip_vs

接下来还需要确保各个节点上已经安装了ipset软件包yum install ipset。 为了便于查看ipvs的代理规则,最好安装一下管理工具ipvsadm yum install ipvsadm。

如果以上前提条件如果不满足,则即使kube-proxy的配置开启了ipvs模式,也会退回到iptables模式。

9.安装docker

------详细教程请查看:

docker安装完成后,配置为阿里云的源

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

10.配置kubernetes的yum源

[root@k8s01 ~]# cat /etc/yum.repos.d/kubernetes.repo 
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

11.iptable设置

[root@k8s01 sysctl.d]# cat /etc/sysctl.d/k8s.conf 
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
net.ipv4.ip_nonlocal_bind = 1

12.kubeadm、kubectl、kubelet安装

yum install -y kubelet-1.13.1 kubeadm-1.13.1 kubectl-1.13.1
systemctl enable kubelet.service

# 配置kubelet使用国内阿里pause镜像,官方的镜像被墙,kubelet启动不了

[root@k8s01 kubernetes]# cat /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS="--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1"

 

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