nginx + keepalived

nginx + keepalived

• 利用keealived 实现nginx HA

• keepalived安装

  下载keepalived官网：http://keepalived.org

  上传到主机

  解压编译安装

  tar -zxvf keepalived-2.2.2.tar.gz
  ./configure --prefix=/usr/local/keepalived
  make && make install
  
  

• 环境准备（局域网地址就直接写在这边，如果是云主机注意打码哦）

  主机	ip
  Host1	192.168.31.128
  Host2	192.168.31.167

• 添加到系统服务

  mkdir /etc/keepalived
  cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
  cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived
  cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
  

• systemctl指令分享

  序号	命令	描述
  1	systemctl enable httpd.service	使某服务自动启动
  2	systemctl disable httpd.service	使某服务不自动启动
  3	systemctl status httpd.service	检查服务状态
  4	systemctl load keepalived.service	加入自定义服务
  5	停止服务，删除keepalived.service	删除服务
  6	systemctl list-units --type=service	显示所有已启动的服务
  7	systemctl start keepalived.service	启动某服务
  8	systemctl stop keepalived.service	停止某服务
  9	systemctl restart keepalived.service	重启某服务

• 启动不成功的话修改service

  cd /usr/lib/systemd/system/
  vi keepalived.service
  
  [Unit]
  Description=LVS and VRRP High Availability Monitor
  After= network-online.target syslog.target
  Wants=network-online.target
   
  [Service]
  Type=forking
  PIDFile=/var/run/keepalived.pid
  KillMode=process
  EnvironmentFile=-/usr/local/etc/sysconfig/keepalived
  ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS
  ExecReload=/bin/kill -HUP $MAINPID
   
  [Install]
  
  #修改完之后执行
  systemctl load keepalived.service
  systemctl daemon-reload
  systemctl start keepalived.service
  
  

• 修改Host1配置

  vi /etc/keepalived/keepalived.conf
  
  global_defs {
  }
  
  vrrp_instance VI_1 {
      state BACKUP
      interface enp0s3
      virtual_router_id 51
      priority 100
      advert_int 1
      authentication {
          auth_type PASS
          auth_pass 1111
      }
      virtual_ipaddress {
          192.168.31.168
      }
  }
  

• 重启host1 keepalived

  systemctl restart keepalived.service
  

• 查看ip

  ip addr
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
      inet 127.0.0.1/8 scope host lo
         valid_lft forever preferred_lft forever
      inet6 ::1/128 scope host
         valid_lft forever preferred_lft forever
  2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
      link/ether 08:00:27:ca:1d:77 brd ff:ff:ff:ff:ff:ff
      inet 192.168.31.128/24 brd 192.168.31.255 scope global noprefixroute dynamic enp0s3
         valid_lft 43176sec preferred_lft 43176sec
      inet 192.168.31.168/32 scope global enp0s3
         valid_lft forever preferred_lft forever
      inet6 fe80::a00:27ff:feca:1d77/64 scope link
         valid_lft forever preferred_lft forever
  

• host2同host1启动流程

• nginx安装

  详情见https://www.cnblogs.com/koiiok/p/15004082.html