keepalived+nginx

Posted 2020-09-30

高集成：keepalived

负载均衡：nginx

1、服务器IP

Client: 172.25.254.25

Keepalived+Nginx1: 172.25.254.115 Vip: 172.25.254.100

Keepalived+Nginx2: 172.25.254.215 Vip: 172.25.254.100

二、安装

1、安装keepalived

     yum install keepalived

2、编译安装Nginx

[[email protected] ~]#useradd -r nginx

[[email protected] ~]#yum -y groupinstall "Development tools" "Server  Platform Development"

[[email protected] ~]#yum -y install pcre-devel

[[email protected] ~]#tar xf nginx-1.4.2.tar.gz

[[email protected] ~]#cd nginx-1.4.2

[[email protected] nginx-1.4.2]# ./configure \

--prefix=/usr\

--sbin-path=/usr/sbin/nginx\

--conf-path=/etc/nginx/nginx.conf \

--error-log-path=/var/log/nginx/error.log \

--http-log-path=/var/log/nginx/access.log \

--pid-path=/var/run/nginx/nginx.pid  \

--lock-path=/var/lock/nginx.lock \

--user=nginx \

--group=nginx \

--with-http_ssl_module \

--with-http_flv_module \

--with-http_stub_status_module \

--with-http_gzip_static_module \

--http-client-body-temp-path=/var/tmp/nginx/client/\

--http-proxy-temp-path=/var/tmp/nginx/proxy/\

--http-fastcgi-temp-path=/var/tmp/nginx/fcgi/\

--http-uwsgi-temp-path=/var/tmp/nginx/uwsgi\

--http-scgi-temp-path=/var/tmp/nginx/scgi\

--with-pcre

提示：在两台服务器上都要安装Nginx

   [[email protected] nginx-1.4.2]# service nginx start

Starting nginx:                                            [  OK  ]

三、实现高可用

1、修改配置keepalived

[[email protected] ~]# cd /etc/keepalived [[email protected] keepalived]# mv keepalived.conf keepalived.conf.bak     [[email protected] keepalived]#vim keepalived.conf                     ! Configuration File forkeepalived global_defs { notification_email { [email protected] } notification_email_from [email protected] smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script chk_nginx { script "killall -0 nginx" interval 1 weight 2 } vrrp_instance VI_10 { state MASTER interface eth0 virtual_router_id 131 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 172.16.3.100 } track_script { chk_nginx }

3、验证

[[email protected] ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8scope host lo inet6 ::1/128scope host valid_lft forever preferred_lft forever 2:  eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 link/ether00:0c:29:65:a0:2f brd ff:ff:ff:ff:ff:ff inet 172.16.3.3/16brd 172.16.255.255 scope global eth0 inet 172.16.3.100/32scope global eth0          # Vip此时在Keepalived+Nginx1上 inet6 fe80::20c:29ff:fe65:a02f/64scope link valid_lft forever preferred_lft forever

然后关闭Keepalived+Nginx1上的keepalived服务Vip会跳转到Keepalived上

四、实现负载均衡

1、修改Keepalived配置文件

Keepalived+Nginx1：

[[email protected] ~]# cd /etc/keepalived [[email protected] keepalived]# mv keepalived.conf keepalived.conf.bak     # 备份keepalived配置文件 [[email protected] keepalived]#vim keepalived.conf                         # 创建配置文件，如下 ! Configuration File forkeepalived global_defs { notification_email { [email protected] } notification_email_from [email protected] smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script chk_nginx { script "killall -0 nginx" interval 1 weight 2 } vrrp_instance VI_10 { state MASTER interface eth0 virtual_router_id 131 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 172.16.3.100 } track_script { chk_nginx } vrrp_instance VI_20 { state BACKUP interface eth0 virtual_router_id 132 priority 99 advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 172.16.3.200 } track_script { chk_nginx    } }

Keepalived+Nginx2  同理

[[email protected] ~]# cd /etc/keeplived [[email protected] keepalived]# mv keepalived.conf keepalived.conf.bak [[email protected] keepalived]# vim keepalived.conf ! Configuration File forkeepalived global_defs { notification_email { [email protected] } notification_email_from [email protected] smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script chk_nginx { script "killall -0 nginx" interval 1 weight 2 } vrrp_instance VI_10 { state BACKUP interface eth0 virtual_router_id 131 priority 99 advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 172.16.3.100 } track_script { chk_nginx } } vrrp_instance VI_20 { state MASTER interface eth0 virtual_router_id 132 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 172.16.3.200 } track_script { chk_nginx } } 2、重启Keepalived服务

[[email protected] ~]# service keepalived restart [[email protected] ~]# service keepalived restart

3、验证

[[email protected] ~]# ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8scope host lo inet6 ::1/128scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 link/ether00:0c:29:52:ee:44 brd ff:ff:ff:ff:ff:ff inet 172.16.3.4/16brd 172.16.255.255 scope global eth0 inet 172.16.3.200/32scope global eth0    #此时vip2在Keepalived+Nginx2上 inet6 fe80::20c:29ff:fe52:ee44/64scope link valid_lft forever preferred_lft forever

4、关闭Keepalived+Nginx2上的Keepalived服务模拟故障，vip2会转移到Keepalived+Nginx1上，反之依然

[[email protected] ~]# ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8scope host lo inet6 ::1/128scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 link/ether00:0c:29:65:a0:2f brd ff:ff:ff:ff:ff:ff inet 172.16.3.3/16brd 172.16.255.255 scope global eth0 inet 172.16.3.100/32scope global eth0 inet 172.16.3.200/32scope global eth0 inet6 fe80::20c:29ff:fe65:a02f/64scope link valid_lft forever preferred_lft forever