K8SEASY:一键安装K8S高可用集群
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《kubeadm部署kubernetes 1.18集群》一文介绍了手动安装三节点单master的k8s集群,整个部署过程相对比较繁琐,但是通过安装有助于入门者初步了解k8s的组件、网络等信息,因此还是需要了解的。
而本文要推荐的是一款可快速部署多节点高可用K8S集群的软件:K8SEASY,同时内置了Dashboard、Prometheus、Grafana、node-exporter等组件,简单易用。
其他优点如下:
一键安装,安装一个系统只需要 3 分钟, 安装好以后完整的监控也一并装好,可以直接使用。(不止支持单master 还支持3master 高可用方案)
新版本发布,支持 1.19.x 新增nginx-ingress, helm 组件, 支持自动发现。
完全不需要配置,一键完成,包括集群也是一键生成。
不需要下载任何镜像,所有需要的模块组件都已经准备。
安装所有的组件是以系统服务方式安装,启动停止方便。
完美支持Centos7.0 和Ubuntu 16.04/18.04。
内核升级
1.离线升级内核
wget https://elrepo.org/linux/kernel/el7/x86_64/RPMS/kernel-lt-5.4.107-1.el7.elrepo.x86_64.rpm
wget https://elrepo.org/linux/kernel/el7/x86_64/RPMS/kernel-lt-devel-5.4.107-1.el7.elrepo.x86_64.rpm
yum localinstall -y kernel-lt-5.4.107-1.el7.elrepo.x86_64.rpm kernel-lt-devel-5.4.107-1.el7.elrepo.x86_64.rpm
2.设置grub内核版本
# vim /etc/default/grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
#由saved改为0
GRUB_DEFAULT=0
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
3.重新创建内核配置
grub2-mkconfig -o /boot/grub2/grub.cfg
4.重启并查看内核
# uname -a
Linux prod-166-203-252 5.4.107-1.el7.elrepo.x86_64 #1 SMP Sat Mar 20 09:47:18 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux
集群部署
1.下载k8seasy组件
wget http://dl.k8seasy.com/installer
wget http://dl.k8seasy.com/kubernetes-server-linux-amd64.tar.gz
wget http://dl.k8seasy.com/pack.2020.10.02.bin
其中:
installer 是安装工具。
kubernetes-server-linux-amd64.tar.gz 可官网下载,须是amd64平台。
pack.2020.10.02.bin 是镜像文件。
2.创建密钥
./installer --genkey -hostlist=10.166.203.252
此时会在installer同级目录下生成密钥k8skey.pem,此密钥将用于后续新节点的加入。
3.创建集群
#如果是多个master,可以使用如下命令
./installer -kubernetestarfile kubernetes-server-linux-amd64.tar.gz -masterip 10.166.203.252,10.166.203.253,10.166.203.254
# 单master
./installer -kubernetestarfile kubernetes-server-linux-amd64.tar.gz -masterip 10.166.203.252
# 以下是单master部署过程打印信息
master: 10.166.203.252
IP: 10.166.203.252 Eth: ens192
1> Upgrade system.
2> Install etcd.
3> Install flanneld.
4> Install haproxy.
5> Update kubernets env.
6> Install K8S API Server.
7> Install K8S Controller Server.
8> Install K8S Scheduler Server.
9> Install Docker.
...............
10> Update Kubeadm env.
11> Install kubelet.
12> Install K8S Proxy.
13> Install coredns.
14> Install monitoring & dashboard.
15> Install Helm.
16> Install nginx-ingress.
17> Install localwebproxy.
请使用浏览器 访问 alertmanager http://10.166.203.252:8080
请使用浏览器 访问 grafana http://10.166.203.252:8081 默认用户名 admin 默认密码 admin
请使用浏览器 访问 prometheus http://10.166.203.252:8082
请使用浏览器 访问 node_export http://10.166.203.252:9100
请使用浏览器 访问 dashboard http://10.166.203.252:10000
You can find more detail about alertmanager by visiting http://10.166.203.252:8080
You can find more detail about grafana by visiting http://10.166.203.252:8081 the default user: admin pass: admin
You can find more detail about prometheus by visiting http://10.166.203.252:8082
You can find more detail about node_export by visiting http://10.166.203.252:9100
You can find more detail about dashboard by visiting http://10.166.203.252:10000
18> Install localwebproxy.
已经复制了一个配置文件 lens.kubeconfig 在当前目录,这个配置文件可以被 各种管理工具(如lens) 直接使用
请在 /etc/hosts 文件里加入 如下内容
10.166.203.252 s7400036261.lens.k8seasy.com
其中10.166.203.252 为本机的IP, 也可以为任何管理工具直接能访问的本机IP (如本机有多个ip 可以任选一个
K8Seasy is a tools that can help you quickly deploy Kubernetes clusters to local and cloud environmental.
K8S version: 1.11.3-1.18
installer version: 1.0.0.004
Packfile version: 2020.10.02.001
Packfile: pack.2020.10.02.bin
Packfile md5sum: 06222ec7e9dfd17efe318e94540c019d
Build Time:
Git Hash:
Website: http://www.k8seasy.com https://github.com/xiaojiaqi/k8seasy_release_page
Feature Request/Bug Report Form: https://github.com/xiaojiaqi/k8seasy_release_page/issues
Email: k8seasy@gmail.com
License: Personal non-commercial use. License cannot be used either directly or indirectly for business purposes.
正如部署信息提示,可通过以下地址登录相关组件:
# 访问 alertmanager
http://10.166.203.252:8080
# 访问 grafana,默认用户名 admin 默认密码 admin
http://10.166.203.252:8081
# 访问 prometheus
http://10.166.203.252:8082
# 访问 node_export
http://10.166.203.252:9100
# 访问 dashboard
http://10.166.203.252:10000
4.查看资源
# 查看api-server,由于是单master,因此只有一个。
# service kube-apiserver status
Redirecting to /bin/systemctl status kube-apiserver.service
● kube-apiserver.service - Kubernetes API Server
Loaded: loaded (/etc/systemd/system/kube-apiserver.service; enabled; vendor preset: disabled)
Active: active (running) since Fri 2021-03-26 18:43:55 CST; 42min ago
Docs: https://github.com/GoogleCloudPlatform/kubernetes
Main PID: 13094 (kube-apiserver)
Tasks: 16
Memory: 347.8M
CGroup: /system.slice/kube-apiserver.service
└─13094 /etc/k8s/k8sapi/api/kube-apiserver --advertise-address=10.166.203.252 --default-not-ready-toleration-seconds=360 --default-unreachable-toleration-seconds=360 --feature-gates=DynamicAuditi...
# kubectl get svc -A
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default kubernetes ClusterIP 10.254.0.1 <none> 443/TCP 29m
kube-system kube-dns ClusterIP 10.254.0.2 <none> 53/UDP,53/TCP,9153/TCP 28m
kube-system kubelet ClusterIP None <none> 10250/TCP,10255/TCP,4194/TCP 27m
kubernetes-dashboard dashboard-metrics-scraper ClusterIP 10.254.68.28 <none> 8000/TCP 27m
kubernetes-dashboard kubernetes-dashboard NodePort 10.254.241.174 <none> 443:10001/TCP,80:10000/TCP 27m
monitoring alertmanager-main ClusterIP 10.254.215.113 <none> 9093/TCP 28m
monitoring alertmanager-operated ClusterIP None <none> 9093/TCP,9094/TCP,9094/UDP 27m
monitoring grafana ClusterIP 10.254.103.193 <none> 3000/TCP 28m
monitoring kube-state-metrics ClusterIP None <none> 8443/TCP,9443/TCP 28m
monitoring node-exporter ClusterIP None <none> 9100/TCP 28m
monitoring prometheus-adapter ClusterIP 10.254.23.219 <none> 443/TCP 28m
monitoring prometheus-k8s ClusterIP 10.254.47.42 <none> 9090/TCP 27m
monitoring prometheus-operated ClusterIP None <none> 9090/TCP 27m
monitoring prometheus-operator ClusterIP None <none> 8443/TCP 28m
从service中可以看到dashboard、alertmanager、grafana、node-exporter都已经内置。
5.加入新节点
#将密钥复制到新节点
cp ../k8skey.pem ./
#将机器加入集群
./installer -kubernetestarfile kubernetes-server-linux-amd64.tar.gz -masterip 10.166.203.252
#如果是多个master集群,可以使用如下命令加入集群
./installer -kubernetestarfile kubernetes-server-linux-amd64.tar.gz -masterip 10.166.203.252,10.166.203.253,10.166.203.254
注意:新节点也要提前准备installer、kubernetes-server-linux-amd64.tar.gz、pack.2020.10.02.bin等安装资源。
6.一键卸载
# ./installer -uninstall
1> uninstall kube-apiserver
2> uninstall kube-controller-manager
3> uninstall kube-proxy
4> uninstall kube-scheduler
5> uninstall kubelet
6> uninstall flanneld
7> uninstall haproxy
8> uninstall docker
9> uninstall etcd
10> uninstall localwebproxy
It's done.
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