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概述

前言

在此前已经部署了单master节点,但,出于集群稳定性的考虑,需要将其扩展为多master。原单master部署链接:kubernetes二进制安装教程单master_zsk_john的博客-CSDN博客

计划是在此基础上扩展,其中的细节还是比较多的,单master和多master的集群规划计划如下:

单master集群规划

单master集群规划表
序号ip角色hostname安装的组件
1192.168.217.16master       master,k8s-masterkube-apiserver,kubelet,kube-controller-manager,kube-proxy,etcd,docker环境
2192.168.217.17slave1slave1,k8s-slave1kubelet,kube-proxy,etcd,docker环境
3192.168.217.18slave2slave2,k8s-slave2kubelet,kube-proxy,etcd,docker环境

多master集群规划

多master集群规划表
序号ip角色hostname安装的组件
1192.168.217.16master1master,k8s-master(master节点)kube-apiserver,kube-controller-manager,kube-proxy,kubelet,etcd,docker环境
2192.168.217.11

master2

master2,k8s-master2(master节点)kube-apiserver,kube-controller-manager,kube-proxy,kubelet,docker环境
3192.168.217.17slave1,node1slave1,k8s-slave1(work节点)kubelet,kube-proxy,etcd,docker环境
4192.168.217.18slave2,node2slave2,k8s-slave2(work节点)kubelet,kube-proxy,etcd,docker环境
5

192.168.217.17

192.168.217.88(vip)

Load Balancer(Master)slave1,k8s-slave1nginx,keepalived
6192.168.217.18Load Balancer(backup)slave2,k8s-slave2nginx,keepalived

规划思路:

增加一台新的服务器,安装master节点所必须的三个组件:kube-apiserver,kube-controller-manager,kube-proxy,etcd由于已经是三个节点了,符合集群的奇数规定,因此,新服务器上不安装etcd,负载均衡软件使用的是nginx和keepalived,负载均衡不能安装在master节点上,因为会端口占用,因此,在两个work节点安装的。docker环境是不管哪个节点都必须安装的,kubelet是节点管理服务,因此,master和work节点都安装。

在实际的生产中,当然负载均衡应该是单独的部署在新服务器上。因服务器不够多,也是实验性质,因此,负载均衡安装在了两个work节点上。

扩展部署master节点步骤

一,

新服务器11上面安装ntp时间服务器,与其他服务器做免密配置,设定主机名,四台服务器的hosts内容如下;

[root@centos1 nginx-offline]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.217.16 master  k8s-master
192.168.217.17 slave1 k8s-node1
192.168.217.18 slave2 k8s-node2
192.168.217.11 master2 k8s-master2

hosts文件通过scp命令同步到所有节点。

新服务上安装docker 环境,可简单一点,如果前面是使用二进制安装的docker,在master服务器也就是16服务器上面执行命令:

scp /usr/bin/{docker,dockerd,docker-init,docker-proxy,ctr,runc,containerd,containerd-shim} 192.168.217.11:/usr/bin/
scp /etc/docker/daemon.json master2:/etc/docker
scp /usr/lib/systemd/system/docker.service 192.168.217.11:/usr/lib/systemd/system/

在11服务器上执行命令,启动docker服务并查看docker状态是否正常:

systemctl enable docker && systemctl start docker && systemctl status docker

二,

在Master2创建etcd证书目录:

mkdir -p /opt/etcd/ssl

在master节点,16服务器上,直接拷贝原有的master节点的现有文件到新服务器上,并做相关修改即可,命令如下:

scp -r /opt/kubernetes root@192.168.217.11:/opt
scp -r /opt/cni/ root@192.168.217.11:/opt
scp -r /opt/etcd/ssl root@192.168.217.11:/opt/etcd
scp /usr/lib/systemd/system/kube* root@192.168.217.11:/usr/lib/systemd/system
scp /usr/bin/kubectl root@192.168.217.11:/usr/bin

三,

在master2节点,11服务器上,删除kubelet证书和kubeconfig文件:

删除的原因是kubelet服务会在启动的时候新生成这些文件,如果是旧的文件,将不会启动成功。

rm -f /opt/kubernetes/cfg/kubelet.kubeconfig
rm -f /opt/kubernetes/ssl/kubelet*

 四,

仍然在master2节点, 11服务器上,修改配置文件(是三个配置文件,不要遗漏了哦):

修改apiserver、kubelet和kube-proxy配置文件为本地IP:
vim /opt/kubernetes/cfg/kube-apiserver.conf
...
--bind-address=192.168.217.11 
--advertise-address=192.168.217.11 
...
vim /opt/kubernetes/cfg/kubelet.conf
--hostname-override=k8s-master2
vi /opt/kubernetes/cfg/kube-proxy-config.yml
hostnameOverride: k8s-master2

五,

在11服务器上启动相关服务:

systemctl daemon-reload
systemctl start kube-apiserver
systemctl start kube-controller-manager
systemctl start kube-scheduler
systemctl start kubelet
systemctl start kube-proxy
systemctl enable kube-apiserver
systemctl enable kube-controller-manager
systemctl enable kube-scheduler
systemctl enable kubelet
systemctl enable kube-proxy

 六,

检测是否正常:

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

此时应该可以看到新的node节点了:

[root@centos1 nginx-offline]# k get no
NAME          STATUS   ROLES    AGE    VERSION
k8s-master    Ready    <none>   9d     v1.18.3
k8s-master2   Ready    <none>   172m   v1.18.3
k8s-node1     Ready    <none>   8d     v1.18.3
k8s-node2     Ready    <none>   8d     v1.18.3

七,

在17和18服务器上都执行:

yum install nginx keepalived -y
systemctl enable nginx keepalived && systemctl start nginx keepalived

 八,负载均衡相关配置文件

17主master:

nginx配置文件(17和18的配置文件都一样的):

[root@master ~]# cat /etc/nginx/nginx.conf
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

stream {

    log_format  main  '  - []  ';

    access_log  /var/log/nginx/k8s-access.log  main;

    upstream k8s-apiserver {
       server 192.168.217.16:6443;
       server 192.168.217.11:6443;
    }
    
    server {
       listen 6443;
       proxy_pass k8s-apiserver;
    }
}

http {
    log_format  main  ' -  [] "" '
                      '  "" '
                      '"" ""';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    server {
        listen       80 default_server;
        server_name  _;

        location / {
        }
    }
}

keepalived的配置文件:

[root@master ~]# cat /etc/keepalived/keepalived.conf 
global_defs { 
   notification_email { 
     acassen@firewall.loc 
     failover@firewall.loc 
     sysadmin@firewall.loc 
   } 
   notification_email_from Alexandre.Cassen@firewall.loc  
   smtp_server 127.0.0.1 
   smtp_connect_timeout 30 
   router_id NGINX_MASTER
} 

vrrp_script check_nginx {
    script "/etc/keepalived/check_nginx.sh"
}

vrrp_instance VI_1 { 
    state MASTER 
    interface ens33
    virtual_router_id 51 # VRRP 路由 ID实例,每个实例是唯一的 
    priority 100    # 优先级,备服务器设置 90 
    advert_int 1    # 指定VRRP 心跳包通告间隔时间,默认1秒 
    authentication { 
        auth_type PASS      
        auth_pass 1111 
    }  
    virtual_ipaddress { 
        192.168.217.88/24
    } 
    track_script {
        check_nginx
    } 
}

18服务器上的keepalived配置文件(两个文件,其中一个是检测脚本,脚本两个节点都要有):

[root@slave2 nginx-offline]# cat /etc/keepalived/check_nginx.sh 
#!/bin/bash
count=$(ps -ef |grep nginx |egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
exit 1
else
exit 0
fi

[root@slave2 nginx-offline]# cat /etc/keepalived/keepalived.conf 
global_defs { 
   notification_email { 
     acassen@firewall.loc 
     failover@firewall.loc 
     sysadmin@firewall.loc 
   } 
   notification_email_from Alexandre.Cassen@firewall.loc  
   smtp_server 127.0.0.1 
   smtp_connect_timeout 30 
   router_id NGINX_MASTER
} 

vrrp_script check_nginx {
    script "/etc/keepalived/check_nginx.sh"
}

vrrp_instance VI_1 { 
    state BACKUP 
    interface ens33
    virtual_router_id 51 # VRRP 路由 ID实例,每个实例是唯一的 
    priority 80    # 优先级,备服务器设置 90 
    advert_int 1    # 指定VRRP 心跳包通告间隔时间,默认1秒 
    authentication { 
        auth_type PASS      
        auth_pass 1111 
    }  
    virtual_ipaddress { 
        192.168.217.88/24
    } 
    track_script {
        check_nginx
    } 
}

九,

重启负载均衡相关服务

systemctl restart nginx keepalived

十,

kube-apiserver服务所使用的证书文件内没有写vip地址,因此,16服务器上的kube-apiserver服务将会启动失败,需要重新生成证书:

在master节点,16服务器上,该文件内添加"192.168.217.88",

[root@master ~]# cat k8s/server-csr.json 
{
"CN": "kubernetes",
"hosts": [
"10.0.0.1",
"127.0.0.1",
"192.168.217.16",
"192.168.217.17",
"192.168.217.18",
"192.168.217.88",
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"L": "BeiJing",
"ST": "BeiJing",
"O": "k8s",
"OU": "System"
}
]
}

重新生成证书:

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

拷贝证书文件(拷贝到本地和新master上):

cp server*pem /opt/kubernetes/ssl/
scp /opt/kubernetes/ssl/server*pem master2:/opt/kubernetes/ssl/

重启服务,使得相关证书生效: 

systemctl restart kube-apiserver kubelet

十一,

所有配置文件内添加VIP的IP地址192.168.217.88 ,并重启相关服务。

sed -i 's#192.168.217.16:6443#192.168.217.88:6443#' /opt/kubernetes/cfg/*
systemctl restart kubelet kube-proyx

十二,

测试单元

在17服务器上,也就是负载均衡的主节点上,可以看到ens33网卡两个ip:

[root@slave1 ~]#  ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ether 00:0c:29:e9:9e:89 brd ff:ff:ff:ff:ff:ff
    inet 192.168.217.17/24 brd 192.168.217.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet 192.168.217.88/24 scope global secondary ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fee9:9e89/64 scope link 
       valid_lft forever preferred_lft forever

此时,停止17上的nginx,在18服务上  ,ip a 命令应该可以看到ens33网卡两个IP,证明负载均衡漂移成功。

通过VIP 可以看到k8s版本:

[root@centos1 nginx-offline]# curl -k https://192.168.217.88:6443/version
{
  "major": "1",
  "minor": "18",
  "gitVersion": "v1.18.3",
  "gitCommit": "2e7996e3e2712684bc73f0dec0200d64eec7fe40",
  "gitTreeState": "clean",
  "buildDate": "2020-05-20T12:43:34Z",
  "goVersion": "go1.13.9",
  "compiler": "gc",
  "platform": "linux/amd64"

最后

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