yungame 2020-04-21
参考:http://litaotao.blog.51cto.com/6224470/1302100
https://www.cnblogs.com/youzhibing/p/7327342.html
192.168.127.129 (master nginx+keepalived)
192.168.127.130 (backup nginx+keepalived )
192.168.127.134 (web)
192.168.127.138 (web)
vip 192.168.127.100 (实际环境中这个ip需要是个公网地址供客户端访问)
1)、Master服务器没挂,则Master占有vip且nginx运行在Master上
2)、Master服务器挂了,则backup抢占vip且在backup上运行nginx服务
3)、如果master服务器上的nginx服务挂了,则vip资源转移到backup服务器上
4)、检测后端服务器的健康状态
说明:
Master和Backup两边都开启nginx服务,无论Master还是Backup,当其中的一个keepalived服务停止后,vip都会漂移到keepalived服务还在的节点上,
如果要想使nginx服务挂了,vip也漂移到另一个节点,则必须用脚本或者在配置文件里面用shell命令来控制。
yum -y install keepalived
[ ~]#tar xf nginx-1.4.2.tar.gz [ ~]#yum -y groupinstall "Development tools" "Server Platform Development" [ ~]#yum -y install pcre-devel [ ~]# cd nginx-1.4.2 [ nginx-1.4.2]# groupadd nginx [ nginx-1.4.2]# useradd -r -g nginx nginx [ 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 make && make install
vi /etc/init.d/nginx #!/bin/bash # chkconfig: - 30 21 # description: http service. # Source Function Library . /etc/init.d/functions # Nginx Settings NGINX_SBIN="/usr/local/nginx/sbin/nginx" NGINX_CONF="/usr/local/nginx/conf/nginx.conf" NGINX_PID="/usr/local/nginx/logs/nginx.pid" RETVAL=0 prog="Nginx" start() { echo -n $"Starting $prog: " mkdir -p /dev/shm/nginx_temp daemon $NGINX_SBIN -c $NGINX_CONF RETVAL=$? echo return $RETVAL } stop() { echo -n $"Stopping $prog: " killproc -p $NGINX_PID $NGINX_SBIN -TERM rm -rf /dev/shm/nginx_temp RETVAL=$? echo return $RETVAL } reload(){ echo -n $"Reloading $prog: " killproc -p $NGINX_PID $NGINX_SBIN -HUP RETVAL=$? echo return $RETVAL } restart(){ stop start } configtest(){ $NGINX_SBIN -c $NGINX_CONF -t return 0 }
global_defs { notification_email { } notification_email_from smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LTT } vrrp_script chk_nginx { #检测nginx服务是否在运行有很多方式,比如进程,用脚本检测等等 script "killall -0 nginx" #用shell命令检查nginx服务是否存在 interval 1 #时间间隔为1秒检测一次 weight -2 #当nginx的服务不存在了,就把当前的权重-2 fall 2 #测试失败的次数 rise 1 #测试成功的次数 } vrrp_instance IN_1 { state MASTER interface eth0 virtual_router_id 22 priority 100 advert_int 1 authentication { auth_type PASS auth_pass aaaa } virtual_ipaddress { 192.168.127.100 #虚拟ip } track_script { chk_nginx #引用上面的vrrp_script定义的脚本名称 } }
/etc/init.d/nginx start /etc/init.d/keepalived start
同master一样(第一步和第二步)
先从master上面拷贝这个配置文件然后更改
vim keepalived.conf #此配置文件是从Master服务器上copy过来,只需小小改动
state BACKUP #把这里原先的MASTER改成BACKUP
priority 99 #把这里原先的100改成99
/etc/init.d/nginx start /etc/init.d/keepalived start
##############################################################################################################
134 :
yum install httpd -y
然后进入到/var/www/html/里面建立一个测试页
vi index.html
134
最后启动服务 /etc/init.d/httpd start
138:
yum install httpd -y
然后进入到/var/www/html/里面建立一个测试页
vi index.html
138
最后启动服务 /etc/init.d/httpd start
注意:两个测试页不同有助于我们分辨是否成功,当然实际环境中都是一样的
master: worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; upstream apacheweb { #定义负载均衡的模块 server 192.168.127.134:80 max_fails=3 fail_timeout=2s; server 192.168.127.138:80 max_fails=3 fail_timeout=2s; } server { listen 80; server_name localhost; location / { root html; index index.html index.htm; proxy_pass http://apacheweb; } error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } } }
backup:
worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; upstream apacheweb { #定义负载均衡的模块 server 192.168.127.134:80 max_fails=3 fail_timeout=2s; server 192.168.127.138:80 max_fails=3 fail_timeout=2s; } server { listen 80; server_name localhost; location / { root html; index index.html index.htm; proxy_pass http://apacheweb; } error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } } }
然后两边分别重启nginx服务
1 把master上面的nginx服务停掉,看客户端能否正常访问网站并且查看vip是否会移动到backup上面
2 把master 上面的keepalived 服务停掉 看客户端能否正常访问网站并且查看vip是否会移动到backup上面
3 把其中一个web服务停掉,看是否还能正常访问web
4测试的时候发现每刷新一次页面就切换一次,lvs不是切换页面