k8s 简易HA
在前一章的基础上搭建k8s HA环境192.168.201.45另一台master(apiserver、scheduler、controller-manager)192.168.201.48LB_master(nginx、keepalived)192.168.201.46LB_backup(nginx、keepalived)另一台master#scp -r /opt/kubernetes/ roo
在前一章的基础上搭建k8s HA
环境
192.168.201.45
另一台master(apiserver、scheduler、controller-manager)
192.168.201.48
LB_master(nginx、keepalived)
192.168.201.46
LB_backup(nginx、keepalived)
192.168.201.50
VIP
另一台master
#scp -r /opt/kubernetes/ root@master2_ip:/opt #在单master基础上继续,将master1上的文件拷贝到master2上
#scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}.service root@master2_ip:/usr/lib/systemd/system/ #将服务一并拷贝过去
#scp -r /opt/etcd/ -r root@master2_ip:/opt
#vi kube-apiserver #将master1_ip修改为master2_id
#ntpdate time.windows.com #需要注意虚拟机里的时间要同步
#systemctl start kube-apiserver
#systemctl start kube-controller-manager
#systemctl start kube-scheduler
#systemctl enable kube-apiserver
#systemctl enable kube-controller-manager
#systemctl enable kube-scheduler
#kubectl get node #确认是否能够正常获取到node
LB_master
#nginx.sh #文件中第一部分($要转义)。生成安装yum源
#yum install nginx -y
#vi /etc/nginx/nginx.conf #将nginx.conf加入http前,并修改相关ip为master1_ip与master2_ip,添加server。其中http是七层配置,加入的stream是四层配置。
#systemctl start nginx
#yum install keepalived -y
#cp keepalived.conf /etc/keepalived/keepalived.conf #上传配置文件覆盖自带配置文件
#vi /etc/keepalived/keepalived.conf #check_nginx文件,用于故障转移;配置文件中IP地址未被使用,会使用此IP作为VIP
#bash -x /etc/nginx/check_nginx.sh
#systemctl start keepalived
#systemctl enable keepalived
nginx.sh
cat > /etc/yum.repos.d/nginx.repo << EOF
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/7/$basearch/
gpgcheck=0
EOF
nginx.conf
stream {
log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
access_log /var/log/nginx/k8s-access.log main;
upstream k8s-apiserver {
server 10.0.0.3:6443;
server 10.0.0.8:6443;
}
server {
listen 6443;
proxy_pass k8s-apiserver;
}
}
LB_backup
#nginx.sh #文件中第一部分($要转义)。生成安装yum源,与LB_master一致。
#yum install nginx -y
#yum install keepalived -y #在 LB_backup安装
#scp /etc/keepalived/keepalived.conf root@LB_backup_ip:/etc/keepalived/ #在LB上将配置文件复制到LB_backup上,并修改文件,state、interface、priority
#scp /etc/nginx/check_nginx.sh root@ LB_backup_ip:/etc/nginx/
#systemctl start keepalived #在LB_backup上执行
#systemctl enable keepalived
#vi /opt/kubernetes/cfg/bootstrap.kubeconfig #在node上修改将master_ip修改为VIP
#vi /opt/kubernetes/cfg/kubelet.kubeconfig #在node上修改将master_ip修改为VIP
#vi /opt/kubernetes/cfg/kube-proxy.kubeconfig #在node上修改将master_ip修改为VIP
#systemctl restart kubelet
#systemctl restart kube-proxy #重启服务,node2也同样
知识点1
配置文件中一个实例vrrp_instance就包括LB_master与LB_backup,所以virtual_router_id值,在一个实例中是一样的;配置文件中LB_master的state配置为master,LB_BACKUP配置为BACKUP;priority是优先级,备服务器要比主服务器数小。
知识点2
在LB_master上配置的VIP,会绑定到配置文件中网络接口上。此时此IP就是可正常PING通使用IP。
知识点3
验证VIP是否生效,就在LB_master上停掉nginx,查看VIP是否飘移到LB_backup(使用ip addr查看) 。
知识点4
VIP地址应该包含到server.pem与server-key.pem文件中。也就是在server-csr.json中hosts中。如果未包括重新编辑server-csr.json,然后重新生成server.pem与server-key.pem,并将文件放到master对应的ssl目录下。
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