配置步驟如下：
1. 安裝nginx、tomcat軟件
四臺服務器分別安裝好nginx
安裝方法參見：LNMP環境搭建
web1，web2上分別安裝好tomcat
安裝方法參見：Tomcat8.5的安裝配置
web1, web2上分別啟動nginx和tomcat
service nginx start
service tomcat start
2. 在master和backup上配置nginx
vi /usr/local/nginx/conf/nginx.conf
加入或修改以下內容：
upstream web_nginx {
server 192.168.75.151;
server 192.168.75.152;
}
upstream web_tomcat {
#ip_hash;
server 192.168.75.151:8080;
server 192.168.75.152:8080;
}
server {
listen 80;
server_name localhost;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
proxy_pass http://web_nginx/;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location ~ \\\\.jsp$ {
proxy_pass http://web_tomcat/;
}
}
分別在master和backup上啟動nginx服務
service nginx start
3. 配置keepalived
在master和backup上分別安裝keepalived
yum install -y keepalived
1) 配置master
vi /etc/keepalived/keepalived.conf
清空原文，加入如下內容：
! Configuration File for keepalived
global_defs {
notification_email {
#acassen@firewall.loc
#failover@firewall.loc
#sysadmin@firewall.loc
}
#notification_email_from Alexandre.Cassen@firewall.loc
#smtp_server 192.168.200.1
#smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_http_port {
script </dev/tcp/127.0.0.1/80
interval 1
weight -2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.75.130
}
track_script {
chk_http_port
}
}
2) 配置backup
scp 192.168.75.131:/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
vi /etc/keepalived/keepalived.conf
backup的配置文件只需要修改
state MASTER -> state BACKUP
priority 100 -> priority 99
最后，分別在master和backup上啟動keepalived服務，先主后備
/etc/init.d/keepalived start
4. 測試：
在master上停止nginx服務
[root@master ~]# /etc/init.d/nginx stop
停止 nginx： [確定]
在backup上查看日志
[root@backup ~]# tail -f /var/log/messages
May 23 17:21:33 backup Keepalived_vrrp[1818]: VRRP_Instance(VI_1) forcing a new MASTER election
May 23 17:21:33 backup Keepalived_vrrp[1818]: VRRP_Instance(VI_1) forcing a new MASTER election
May 23 17:21:34 backup Keepalived_vrrp[1818]: VRRP_Instance(VI_1) Transition to MASTER STATE
May 23 17:21:35 backup Keepalived_vrrp[1818]: VRRP_Instance(VI_1) Entering MASTER STATE
May 23 17:21:35 backup Keepalived_vrrp[1818]: VRRP_Instance(VI_1) setting protocol VIPs.
May 23 17:21:35 backup Keepalived_vrrp[1818]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.75.130
May 23 17:21:35 backup Keepalived_healthcheckers[1817]: Netlink reflector reports IP 192.168.75.130 added
May 23 17:21:40 backup Keepalived_vrrp[1818]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.75.130
日志顯示已經成功切換到備用節點上。
[root@backup ~]# curl 192.168.75.130 -I
HTTP/1.1 200 OK
Server: nginx/1.10.3
Date: Tue, 23 May 2017 09:34:21 GMT
Content-Type: text/html
Content-Length: 616
Connection: keep-alive
Last-Modified: Mon, 22 May 2017 10:28:07 GMT
ETag: 5922bd37-268
Accept-Ranges: bytes
master停掉后，用curl訪問web服務，一切正常。
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