企业级-生产级k8s集群搭建（基于开源rancher-V2.3.2）

生产环境k8s集群接入方案主要由以下三部分组成：

1、rancher ui，k8s可视化管理平台

2、nginx、k8s集群，业务服务访问入口

3、物理机

整体架构图：

准备：

1、所有主机节点开通外网访问权限

2、申请https://k8s-pro.xx.com rancher ui 域名解析

3、申请xxx.k8spro.xx.com 业务服务域名解析

4、k8s相关命令文件地址：http://172.16.101.32/stgconfig/soft

一、安装环境

1、硬件环境

2、软件环境

os：centos7.6

rancher：2.3.2

docker：17.03.2-ce ， overlay2存储，extfs 文件系统

二、安装前的准备

1、主机环境配置

1.1、关闭防火墙

sudo systemctl stop firewalld.service && sudo systemctl disable firewalld.service
1.2、关闭setlinx

sudo sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

1.3、关闭swap

注释或删除swap交换分区：vi /etc/fstab

#/dev/mapper/centos-swap swap swap defaults 0 0

1.4、配置主机时间、时区、系统语言

sudo ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

sudo echo 'LANG="en_US.UTF-8"' >> /etc/profile;source /etc/profile

1.5、修改最大进程数、用户进程打开文件数

echo '1000000' > /proc/sys/kernel/pid_max

vim /etc/sysctl.conf

kernel.pid_max=1000000

sysctl -p 保存生效

--------

vi /etc/security/limits.conf

* soft nproc 102400
* hard nofile 65535
jyapp hard nofile 102400
jyapp soft nofile 102400
jyapp soft nproc 102400
root soft nproc unlimited
root soft nofile 102400
root hard nofile 102400

1.6、Kernel性能调优

vi /etc/sysctl.conf

追加

net.ipv4.ip_forward=1

net.bridge.bridge-nf-call-iptables=1

net.ipv4.neigh.default.gc_thresh1=4096

net.ipv4.neigh.default.gc_thresh2=6144

net.ipv4.neigh.default.gc_thresh3=8192

1.7、修改本机dns

vi /etc/resolv.conf

nameserver 172.16.101.28
nameserver 172.16.101.18

2、安装docker-ce并配置

# 添加用户(可选)

sudo adduser jyapp

# 为新用户设置密码

sudo passwd jyapp

# 为新用户添加sudo权限

sudo echo 'jyapp ALL=(ALL) ALL' >> /etc/sudoers
Docker 9步快速安装（https://blog.csdn.net/chen978616649/article/details/80505195）

jyapp加用docker用户组

sudo usermod -a -G docker jyapp

vi /etc/docker/daemon.json

{
"bip":"172.25.100.1/24"
,"insecure-registries":["172.16.101.43:5000","172.16.101.49","10.50.182.85","docker.xx.com"]
,"registry-mirrors": ["http://172.16.101.49","http://10.50.182.85","http://docker.xx.com","https://088aunhx.mirror.aliyuncs.com"]

,"log-driver": "json-file"
,"log-opts": {
"max-size": "100m",
"max-file": "3"
}
,"max-concurrent-downloads": 10
,"max-concurrent-uploads": 10
,"storage-driver": "overlay2"
,"storage-opts": ["overlay2.override_kernel_check=true"]
}

systemctl daemon-reload

systemctl restart docker

3、下载命令行工具

附件中下载

kubectl，rke，helm 到 172.19.101.135 /usr/local/bin 下

命令工具下载地址：http://172.16.101.32/stgconfig/soft/raw/master/k8s-kub.tar.gz

cd /usr/local/bin

赋可执行权限

sudo chmod +x *

修改profile

sudo vi /etc/profile

追加：

export PATH="/usr/local/bin:$PATH"

保存退出，使之生效

sudo source /etc/profile

4、免密登录

在172.19.101.135用jyapp用户执行：

ssh-keygen -t rsa

ssh-copy-id -p 10022 -i ~/.ssh/id_rsa.pub [email protected]

三、rke安装k8s

1、配置rke 创建rancher-cluster.yml文件

nodes:

- address: 172.19.101.135
user: jyapp
role: [controlplane,worker,etcd]
port: 10022
- address: 172.19.101.136
user: jyapp
role: [controlplane,worker,etcd]
port: 10022
- address: 172.19.101.137
user: jyapp
role: [controlplane,worker,etcd]
port: 10022
services:
etcd:
backup_config:
enabled: true
interval_hours: 6
retention: 12
extra_args:
quota-backend-bytes: '4294967296'
kubelet:
cluster_domain: cluster.local
cluster_dns_server: 10.43.0.10
fail_swap_on: true
extra_args:
max-pods: 50
kube-api-burst: '100'
kube-api-qps: '100'
#enforce-node-allocatable: 'pods'
#system-reserved: 'cpu=1,memory=4000Mi'
#kube-reserved: 'cpu=1,memory=4000Mi'
kube-controller:
cluster_cidr: 10.42.0.0/16
service_cluster_ip_range: 10.43.0.0/16
extra_args:
node-cidr-mask-size: '24'
kube-api:
service_cluster_ip_range: 10.43.0.0/16
service_node_port_range: 30000-32767
pod_security_policy: false
always_pull_images: false

2、运行RKE命令

rke up --config rancher-cluster.yml

完成后，它应显示：Finished building Kubernetes cluster successfully。

在本目录会生成config文件：kube_config_rancher-cluster.yml

如若操作失败，重新安装需要清理数据：

su - root
rm -rf /var/lib/rancher/etcd/*
rm -rf /etc/kubernetes/*
su - jyapp
rke remove --config ./rancher-cluster.yml
3、测试集群

mkdir ~/.kube

cp kube_config_rancher-cluster.yml ~/.kube/config

kubectl get cs

NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-0 Healthy {"health": "true"}
etcd-2 Healthy {"health": "true"}
etcd-1 Healthy {"health": "true"}

kubectl get node

NAME STATUS ROLES AGE VERSION
172.19.101.135 Ready controlplane,etcd,worker 20d v1.13.5
172.19.101.136 Ready controlplane,etcd,worker 20d v1.13.5
172.19.101.137 Ready controlplane,etcd,worker 20d v1.13.5

四、安装 rancher server

1、分别在172.19.101.117、172.19.101.134上执行

docker run -d --restart=unless-stopped \
-p 80:80 -p 443:443 \
-v /var/lib/rancher/:/var/lib/rancher/ \
-v /root/var/log/auditlog:/var/log/auditlog \
-e CATTLE_SYSTEM_CATALOG=bundled \
-e AUDIT_LEVEL=3 \
rancher/rancher:v2.3.2
访问：https://172.19.101.117

注：ui初始登录时需指访问地址为 k8s-pro.xx.com

2、通过rancher ui导入 rke k8s集群

五、配置nginx

1、sudo vi /etc/nginx/nginx.conf

user nginx;
worker_processes 4;

error_log /var/log/nginx/error.log warn;

worker_rlimit_nofile 40000;

events {
worker_connections 8192;
}

http {

upstream rancher_web{
server 172.19.101.135:80;
server 172.19.101.136:80;
server 172.19.101.137:80;
}
server {

listen 80 default_server;
server_name _;
access_log logs/busiweb.access.log main;

client_max_body_size 300m;
client_body_buffer_size 128k;
proxy_connect_timeout 600;
proxy_read_timeout 600;
proxy_send_timeout 600;
proxy_buffer_size 64k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;

location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

proxy_pass http://rancher_web;
}

}

2、或可以容器化nginx代替以上安装

下载附件nginx.tar.gz 并解压

略作修改：按上面nginx.conf 修改

执行 sh startNginx-80.sh 即可

六、jdk主机安装

集群各节点 135、136、137均需安装

jdk下载地址：

jdk为开发、测试、准生产、生产环境通用的标准及版本1.7和1.8，支持中文字体
下载方式：wget http://172.16.101.32/stgconfig/soft/raw/master/jdk.tar.gz
解压方式：tar -zxf jdk.tar.gz

解压到 /root/目录下即可