目录
Nginx+keepalived实现七层的负载均衡的高可用
一、准备服务器
1、主机清单
2、配置安装nginx 所有的机器,关闭防火墙和selinux
3.安装nginx, 全部4台
二、部署负载均衡
1、修改nginx的配置文件,添加以下内容,
2、重启nginx
3.修改server1、server2的web页面测试
4..访问负载均衡
三、Keepalived实现调度器HA
1、 主/备调度器安装软件
2、备份keepalived配置文件
3、修改配置文件
4、启动keepalived(主备均启动)
四、解决nginx服务故障
1、作用
2、检查nginx健康的脚本
3、测试
Nginx+keepalived实现七层的负载均衡的高可用
一、准备服务器
1、主机清单
主机名ip系统Proxy-master10.12.153.105centos7.5Proxy-slave10.12.153.176centos7.5Real-server110.12.153.114Centos7.5Real-server210.12.153.187centos7.5
2、配置安装nginx 所有的机器,关闭防火墙和selinux
[root@proxy-master ~]# systemctl stop firewalld //关闭防火墙
[root@proxy-master ~]# sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/sysconfig/selinux //关闭selinux,重启生效
[root@proxy-master ~]# setenforce 0 //关闭selinux,临时生效
3.安装nginx, 全部4台
[root@proxy-master ~]# cd /etc/yum.repos.d/
[root@proxy-master yum.repos.d]# vim nginx.repo
[nginx-stable]
name=nginx stable repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1
[root@proxy-master yum.repos.d]# yum install yum-utils -y
[root@proxy-master yum.repos.d]# yum install nginx -y
二、部署负载均衡
1、选择两台nginx服务器作为代理服务器。 2、给两台代理服务器安装keepalived制作高可用生成VIP 3、配置nginx的负载均衡
#两台代理配置一样
1、修改nginx的配置文件,添加以下内容,
#注意:将/etc/nginx/conf.d/default.conf改名,不然转发不过去
[root@proxy-slave conf.d]# mv default.conf default.conf.back
upstream backend {
server 10.12.153.114:80 weight=1 max_fails=3 fail_timeout=20s;
server 10.12.153.187:80 weight=1 max_fails=3 fail_timeout=20s;
}
server {
listen 80;
server_name localhost;
location / {
proxy_pass http://backend;
proxy_set_header Host $host:$proxy_port;
proxy_set_header X-Forwarded-For $remote_addr;
}
}
2、重启nginx
[root@proxy-master ~]# nginx -s reload
3.修改server1、server2的web页面测试
[root@server2 ~]# cat >>/usr/share/nginx/html/index.html< > 187 > EOF [root@server1 html]# cat >/usr/share/nginx/html/index.html< > 114 > EOF 4..访问负载均衡 负载均衡正常 三、Keepalived实现调度器HA 注:主/备调度器均能够实现正常调度 1、 主/备调度器安装软件 [root@proxy-master ~]# yum install -y keepalived [root@proxy-slave ~]# yum install -y keepalived 2、备份keepalived配置文件 [root@proxy-master ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak 3、修改配置文件 ①修改master [root@proxy-master ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { router_id directory1 #辅助改为directory2 } : vrrp_instance VI_1 { state MASTER #定义主还是备 interface ens33 #VIP绑定接口 virtual_router_id 80 #整个集群的调度器一致 priority 100 #back改为50 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.12.153.151/24 # vip } } ②修改slave [root@proxy-slave ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { router_id directory2 } vrrp_instance VI_1 { state BACKUP #设置为backup interface ens33 nopreempt #设置到back上面,不抢占资源 virtual_router_id 80 priority 50 #辅助改为50 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.12.153.151/24 } } 4、启动keepalived(主备均启动) [root@proxy-master ~]# systemctl enable keepalived [root@proxy-slave ~]# systemctl start keepalived 5、通过停止keepalived来测试VIP是否飘逸 ①在master,slave上查看 ②停掉master的keepalived来模仿master宕机,看VIP是否飘逸 由此可见nginx的高可用成功 到此: 可以解决心跳故障keepalived 不能解决Nginx服务故障 四、解决nginx服务故障 扩展对调度器Nginx健康检查(可选)两台都设置 1、作用 让Keepalived以一定时间间隔执行一个外部脚本,脚本的功能是当Nginx失败,则关闭本机的Keepalived 2、检查nginx健康的脚本 ! Configuration File for keepalived global_defs { router_id directory1 #辅助改为directory2 } : vrrp_script check_nginx { script "/etc/keepalived/check_nginx_status.sh" interval 5 } vrrp_instance VI_1 { state MASTER #定义主还是备 interface ens33 #VIP绑定接口 virtual_router_id 80 #整个集群的调度器一致 priority 100 #back改为50 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.12.153.151/24 # vip } track_script { check_nginx } } 注:必须先启动nginx,再启动keepalived 3、测试 停止master的nginx,VIP会飘逸到salve上, 再次启动master的nginx,重启master的keepalived,VIP会飘到master上。 推荐链接
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