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[经验分享] Nginx+Keepalived主备负载均衡学习笔记

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发表于 2018-12-30 13:09:47 | 显示全部楼层 |阅读模式
实验环境及软件版本:

CentOS版本:    6.6(2.6.32.-504.el6.x86_64)
nginx版本:     nginx-1.6.2
keepalived版本:keepalived-1.2.7


准备工作:
关闭防火墙:service iptables stop
            chkconfig iptables off
关闭selinux: sed -i 's/SELINUX=disabled/SELINUX=enforcing/g' /etc/selinux/config
             init 6 重启系统一定要!
  

  1.准备安装依赖包:
  yum -y install pcre pcre-devel openssl openssl-devel zlib zlib-devel gcc gcc-c++ popt-devel
  安装keepalived出现configure: error: Popt libraries is required
  解决方法:yum -y install popt-devel
  2.下载安装包
  wget http://nginx.org/download/nginx-1.6.2.tar.gz
  wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz
  3.安装NginX
  tar zxvf nginx-1.6.2.tar.gz
  cd nginx-1.6.2
  ./configure
  make && make install
  4.安装keepalived
  tar zxvf keepalived-1.2.7.tar.gz
  cd keepalived-1.2.7
  ./configure
  make
  make install
  cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
  cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
  mkdir /etc/keepalived
  cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
  cp /usr/local/sbin/keepalived /usr/sbin/
  5.加入开机自启动服务
  方法一
  echo "/usr/local/nginx/sbin/nginx" >> /etc/rc.local
  echo "/etc/init.d/keepalived start" >> /etc/rc.local
  方法二
  [root@nginx keepalived-1.2.7]# cat >>/etc/rc.local /etc/init.d/keepalived start
  > EOF
  [root@nginx keepalived-1.2.7]# cat /etc/rc.local
  #!/bin/sh
  #
  # This script will be executed *after* all the other init scripts.
  # You can put your own initialization stuff in here if you don't
  # want to do the full Sys V style init stuff.
  

  touch /var/lock/subsys/local
  /usr/local/nginx/sbin/nginx
  /etc/init.d/keepalived start
  6.配置
  6.1 配置nginx
  两台接入服务器的nginx的配置完全一样,主要配置/usr/local/nginx/conf/nginx.conf的http.其中多域名指向是通过虚拟主机(配置http下面的server)实现;同一域名的不同虚拟目录通过每
  个server下面的不同location实现.
  http {
  include       mime.types;
  default_type  application/octet-stream;
  

  #log_format  main  '$remote_addr - $remote_user [$time_local] "$re
  quest" '
  #                  '$status $body_bytes_sent "$http_referer" '
  #                  '"$http_user_agent" "$http_x_forwarded_for"';
  

  #access_log  logs/access.log  main;
  

  sendfile        on;
  #tcp_nopush     on;
  

  #keepalive_timeout  0;
  keepalive_timeout  65;
  

  #gzip  on;
  

  upstream myserver{
  server 192.168.0.110:80  max_fails=3 fail_timeout=20s;
  server 192.168.0.111:80  max_fails=3 fail_timeout=20s;
  ip_hash;
  }
  

  server {
  listen       80;
  server_name  192.168.0.150;
  

  #charset koi8-r;
  

  #access_log  logs/host.access.log  main;
  

  location / {
  root /var/www/html;
  index index.php index.htm index.html;
  proxy_redirect off;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_next_upstream http_500 http_502 http_503 error timeo
  ut invalid_header;
  proxy_set_header X-Forwarded-For $remote_addr;
  proxy_pass   http://myserver;
  }
  }
  6.2 配置keepalived
  按照上面的安装方法,keepalived的配置文件在/etc/keepalived/keepalived.conf.主、从服务器的
  配置相关联但有所不同。如下:
  Master:
  ! 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 smtp.etiantian.org
  smtp_connect_timeout 30
  router_id nginx_master
  }
  

  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 {
  192.168.0.150
  }
  }
  

  Backup:
  ! 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 smtp.etiantian.org
  smtp_connect_timeout 30
  router_id nginx_backup
  }
  

  vrrp_instance VI_1 {
  state BACKUP
  interface eth0
  virtual_router_id 51
  priority 99
  advert_int 1
  authentication {
  auth_type PASS
  auth_pass 1111
  }
  virtual_ipaddress {
  192.168.0.150
  }
  }
  

  7.验证
  先后在主、从服务器上启动/usr/local/nginx/sbin/nginx
  /etc/init.d/keepalived start
  在主服务器上查看是否已经绑定了虚拟IP(VIP):ip addr
  [root@nginx ~]# ip addr
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
  inet6 ::1/128 scope host
  valid_lft forever preferred_lft forever
  2: eth0:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
  link/ether 00:0c:29:af:00:4e brd ff:ff:ff:ff:ff:ff
  inet 192.168.0.130/24 brd 192.168.0.255 scope global eth0
  inet 192.168.0.150/32 scope global eth0
  inet6 fe80::20c:29ff:feaf:4e/64 scope link
  valid_lft forever preferred_lft forever
  停止主服务器上的keepalived:/etc/init.d/keepalived stop然后在从服务器上查看是否已经绑
  定了虚拟IP(VIP):
  [root@nginx_back ~]# ip addr
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
  inet6 ::1/128 scope host
  valid_lft forever preferred_lft forever
  2: eth0:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
  link/ether 00:0c:29:21:b6:b1 brd ff:ff:ff:ff:ff:ff
  inet 192.168.0.131/24 brd 192.168.0.255 scope global eth0
  inet 192.168.0.150/32 scope global eth0
  inet6 fe80::20c:29ff:fe21:b6b1/64 scope link
  valid_lft forever preferred_lft forever
  启动主服务器上的keepalived:/etc/init.d/keepalived start,再看看主服务器能否重新接管虚拟IP(VIP)
  [root@nginx ~]# ip addr
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
  inet6 ::1/128 scope host
  valid_lft forever preferred_lft forever
  2: eth0:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
  link/ether 00:0c:29:af:00:4e brd ff:ff:ff:ff:ff:ff
  inet 192.168.0.130/24 brd 192.168.0.255 scope global eth0
  inet 192.168.0.150/32 scope global eth0
  inet6 fe80::20c:29ff:feaf:4e/64 scope link
  valid_lft forever preferred_lft forever
  





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所有资源均系网友上传或者通过网络收集,我们仅提供一个展示、介绍、观摩学习的平台,我们不对其承担任何法律责任,如涉及侵犯版权等问题,请您及时通知我们,我们将立即处理,联系人Email:kefu@iyunv.com,QQ:1061981298 本贴地址:https://www.yunweiku.com/thread-657603-1-1.html 上篇帖子: Nginx+Keepalived+Proxy_Cache 配置高可用集群和高速缓存 下篇帖子: keepalived双主互备和自定义日志
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