kubeadm 安装 k8s v1.13.1 HA 详细教程之一：环境准备

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
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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 
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    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
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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

9.安装 docker


------详细教程请查看：
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docker安装完成后，配置为阿里云的源
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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
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# 配置kubelet使用国内阿里pause镜像，官方的镜像被墙，kubelet启动不了
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[root@k8s01 kubernetes]# cat /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS="--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1"