(三)Kubernetes/K8s高可用架构-创新互联
高可用架构 采用多master+多lb+keepalive的方案实现(注意其中lb的ip 地址的证书)
1,多master安装
将原master 1 部署文件拷贝到新master,修改bind 地址 启动 注意 由于需要连接etcd 需要拷贝etcd 的证书
scp –r /opt/kubernetes root@192.168.0.102:/opt
scp –r /opt/etcd/ssl root@192.168.0.102:/opt/etcd
scp /usr/lib/systemd/system/{kube-apiserver,kube-controller-manager,kube-scheduler}.service root@192.168.31.64:/usr/lib/systemd/system
##修改apiserver配置文件为本地IP
vim /opt/kubernetes/cfg/kube-apiserver.conf
--bind-address=192.168.0.102 \
--secure-port=6443 \
--advertise-address=192.168.0.102 \
#启动
for i in $(ls /opt/kubernetes/bin/);do systemctl start $i;systemctl enable $i; done
lb部署
lb--nginx-mater
#安装Nginx+Keepalived
rpm -ivh http://nginx.org/packages/rhel/7/x86_64/RPMS/nginx-1.16.0-1.el7.ngx.x86_64.rpm
vim /etc/nginx/nginx.conf
##注意添加的配置文件的位置 特别是需要inclued 插入放于events 和http 之间
stream {
log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
access_log /var/log/nginx/k8s-access.log main; ## 安装好 之后不需要 可以关闭 日志量比较大
upstream k8s-apiserver {
server 192.168.0.101:6443; ## 后端安装master 地址
server 192.168.0.102:6443;
}
server {
listen 6443;
proxy_pass k8s-apiserver;
}
}
keepalived 高可用
yum install keepalived
vi /etc/keepalived/keepalived.conf
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id NGINX_MASTER
}
vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh"
}
vrrp_instance VI_1 {
state MASTER
interface ens33 ## 自己机器网卡的名称
virtual_router_id 51 # VRRP 路由 ID实例,每个实例是唯一的
priority 100 # 优先级,备服务器设置 90
advert_int 1 # 指定VRRP 心跳包通告间隔时间,默认1秒
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.105/24 ## 虚拟vip地址
}
track_script {
check_nginx
}
}
判断nginx 进程脚本
#!/bin/bash
count=$(ps -ef |grep nginx |egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
exit 1
else
exit 0
fi
systemctl start keepalived
systemctl enable keepalived
lb-nginx-backup
nginx 安装同上
yum install keepalived
vi /etc/keepalived/keepalived.conf
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id NGINX_BACKUP
}
vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh"
}
vrrp_instance VI_1 {
state BACKUP ##标注角色
interface ens33 ##自己网卡的名称
virtual_router_id 51 # VRRP 路由 ID实例,每个实例是唯一的
priority 90 # 优先级,备服务器设置 90
advert_int 1 # 指定VRRP 心跳包通告间隔时间,默认1秒
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.105/24
}
track_script {
check_nginx
}
}
# cat /etc/keepalived/check_nginx.sh
#!/bin/bash
count=$(ps -ef |grep nginx |egrep -cv "grep|$$")
if [ "$count" -eq 0 ];then
exit 1
else
exit 0
fi
# systemctl start keepalived
# systemctl enable keepalived
测试
##在lb master节点
ip addr show ## 查看vip 是否绑定到了网卡上面 关闭nginx 查看vip 是否能漂移到backup 上面
修改所有node apiserver地址填写为vip
cd /opt/kubernetes/cfg
grep 192 *
bootstrap.kubeconfig: server: https://192.168.31.63:6443
kubelet.kubeconfig: server: https://192.168.31.636443
kube-proxy.kubeconfig: server: https://192.168.31.63:6443
#批量修改:
sed -i 's#192.168.0.63#192.168.0.105 *
curl -k --header "Authorization: Bearer c47ffb939f5ca36231d9e3121a252940" https://192.168.31.60:6443/version
##此teken 是bootstarp 的token
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