keepalived高可用搭建
高可用就是一台服务器down机后另一台服务器可以马上接手继续工作而不影响用户使用。在前面负载均衡的基础上进行搭建两台作为keeplived服务。另外两台作为web服务器。
我们要先在keeplived服务器上安装keepalived。命令如下yum install keepalived -y ,启动keepalived，/etc/init.d/keepalived start.主备都要进行此安装。
下面进行配置：cd /etc/keepalived,vi keepalived.conf:主，配置如下：
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 lb01 //和备不同
}
vrrp_instance VI_1 {
state MASTER//不同
interface eth0
virtual_router_id 51
priority 150//不同
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.12/24 dev eth0 label eth0:1
# 192.168.200.17
# 192.168.200.18
}
}
备，配置如下：
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 lb02
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.0.0.12/24 dev eth0 label eth0:1
# 192.168.200.17
# 192.168.200.18
}
}
配置完毕后重启keepalived服务，/etc/init.d/keepalived restart,检查结果ip addr|grep 10.0.0.12(在主备都正常工作的时候，在备服务器上运行不会有任何东西返回，当主down机时，备就有数据返回，我们可以停止主的keepalived服务进行测试)。
接下来配置主备的nginx.conf,主备配置是一样的，配置如下:
..............省略了一些
#access_log logs/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
# keepalive_timeout 65;
#gzip on;
upstream backend {
server 49.4.143.218;
server 49.4.143.217;
check interval=3000 rise=2 fall=5 timeout=1000 type=http;//节点检测
}
server {
listen 10.0.0.12:80;//这里和keepalived.conf里面的virtual_ipaddress 一致
server_name www.xtwanwan.info;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
# root html/www;
# index index.php index.html index.htm;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_buffering off;
proxy_pass http://backend;
}
location /status {
check_status;
access_log off;
}
...................//省略了一些
最后测试要把域名解析执行主备keepalived服务器才行，然后就可以测试了。