Keepalived+Nginx 高可用集群(主从模式)
集群架构图:
说明:Keepalived机器同样是nginx负载均衡器。
1)实验环境准备(此处都是使用的centos7系统)
# cat /etc/redhat-release CentOS Linux release 7.4.1708 (Core)
在所有节点上面进行配置
# systemctl stop firewalld //关闭防火墙 # sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/sysconfig/selinux //关闭selinux,重启生效 # setenforce 0 //关闭selinux,临时生效 # ntpdate 0.centos.pool.ntp.org //时间同步 # yum install nginx -y //安装nginx
2)配置后端web服务器(两台一样)
# echo "`hostname` `ifconfig ens33 |sed -n 's#.*inet \(.*\)netmask.*#\1#p'`" > /usr/share/nginx/html/index.html //准备测试文件,此处是将主机名和ip写到index.html页面中
# vim /etc/nginx/nginx.conf //编辑配置文件 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; } http { log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; 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; include /etc/nginx/conf.d/*.conf; server { listen 80; server_name www.mtian.org; location / { root /usr/share/nginx/html; } access_log /var/log/nginx/access.log main; } }
# systemctl start nginx //启动nginx # systemctl enable nginx //加入开机启动
3)配置LB服务器(两台都一样)
# vim /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; } http { log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; 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; include /etc/nginx/conf.d/*.conf; upstream backend { server 192.168.1.33:80 weight=1 max_fails=3 fail_timeout=20s; server 192.168.1.34:80 weight=1 max_fails=3 fail_timeout=20s; } server { listen 80; server_name www.mtian.org; location / { proxy_pass http://backend; proxy_set_header Host $host:$proxy_port; proxy_set_header X-Forwarded-For $remote_addr; } } }
# systemctl start nginx //启动nginx # systemctl enable nginx //加入开机自启动
4)在测试机(192.168.1.35)上面添加host解析,并测试lb集群是否正常。(测试机任意都可以,只要能访问lb节点。)
[root@node01 ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.1.32 www.mtian.org 192.168.1.31 www.mtian.org
// 测试时候轮流关闭lb1 和 lb2 节点,关闭后还是能够访问并看到轮循效果即表示 nginx lb集群搭建成功。 [root@node01 ~]# curl www.mtian.org web01 192.168.1.33 [root@node01 ~]# curl www.mtian.org web02 192.168.1.34 [root@node01 ~]# curl www.mtian.org web01 192.168.1.33 [root@node01 ~]# curl www.mtian.org web02 192.168.1.34 [root@node01 ~]# curl www.mtian.org web01 192.168.1.33 [root@node01 ~]# curl www.mtian.org web02 192.168.1.34
5)上面步骤成功后,开始搭建keepalived,在两台 lb节点上面安装keepalived(也可以源码编译安装、此处直接使用yum安装)
# yum install keepalived -y
6)配置 LB-01节点
[root@LB-01 ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { 381347268@qq.com } smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 51 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.1.110/24 dev ens33 label ens33:1 } }
[root@LB-01 ~]# systemctl start keepalived //启动keepalived [root@LB-01 ~]# systemctl enable keepalived //加入开机自启动
[root@LB-01 ~]# ip a //查看IP,会发现多出了VIP 192.168.1.110 ...... 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:94:17:44 brd ff:ff:ff:ff:ff:ff inet 192.168.1.31/24 brd 192.168.1.255 scope global ens33 valid_lft forever preferred_lft forever inet 192.168.1.110/24 scope global secondary ens33:1 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fe94:1744/64 scope link valid_lft forever preferred_lft forever ......
7)配置 LB-02节点
[root@LB-02 ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { 381347268@qq.com } smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_instance VI_1 { state BACKUP interface ens33 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.1.110/24 dev ens33 label ens33:1 } }
[root@LB-02 ~]# systemctl start keepalived //启动keepalived [root@LB-02 ~]# systemctl enable keepalived //加入开机自启动
[root@LB-02 ~]# ifconfig //查看IP,此时备节点不会有VIP(只有当主挂了的时候,VIP才会飘到备节点) ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.1.32 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::20c:29ff:feab:6532 prefixlen 64 scopeid 0x20<link> ether 00:0c:29:ab:65:32 txqueuelen 1000 (Ethernet) RX packets 43752 bytes 17739987 (16.9 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 4177 bytes 415805 (406.0 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 ......
8)在测试机器上面访问 Keepalived上面配置的VIP 192.168.1.110
[root@node01 ~]# curl 192.168.1.110 web01 192.168.1.33 [root@node01 ~]# curl 192.168.1.110 web02 192.168.1.34 [root@node01 ~]# curl 192.168.1.110 web01 192.168.1.33 [root@node01 ~]# curl 192.168.1.110 web02 192.168.1.34
//关闭LB-01 节点上面keepalived主节点。再次访问 [root@LB-01 ~]# systemctl stop keepalived [root@node01 ~]# [root@node01 ~]# curl 192.168.1.110 web01 192.168.1.33 [root@node01 ~]# curl 192.168.1.110 web02 192.168.1.34 [root@node01 ~]# curl 192.168.1.110 web01 192.168.1.33 [root@node01 ~]# curl 192.168.1.110 web02 192.168.1.34
//此时查看LB-01 主节点上面的IP ,发现已经没有了 VIP [root@LB-01 ~]# ifconfig ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.1.31 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::20c:29ff:fe94:1744 prefixlen 64 scopeid 0x20<link> ether 00:0c:29:94:17:44 txqueuelen 1000 (Ethernet) RX packets 46813 bytes 18033403 (17.1 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 9350 bytes 1040882 (1016.4 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 ...
//查看LB-02 备节点上面的IP,发现 VIP已经成功飘过来了 [root@LB-02 ~]# ifconfig ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.1.32 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::20c:29ff:feab:6532 prefixlen 64 scopeid 0x20<link> ether 00:0c:29:ab:65:32 txqueuelen 1000 (Ethernet) RX packets 44023 bytes 17760070 (16.9 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 4333 bytes 430037 (419.9 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 ens33:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.1.110 netmask 255.255.255.0 broadcast 0.0.0.0 ether 00:0c:29:ab:65:32 txqueuelen 1000 (Ethernet) ...
到此,Keepalived+Nginx高可用集群(主从)就搭建完成了。
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