Centos7编译安装Nginx+keepalived

一、安装环境、主机信息及软件版本

Nginx：1.12.2
keepalived:2.0.12
时间同步(同步后确认各服务器时间是否一致，不一致需要修改一下时区)
关闭防火墙

二、编译安装Nginx

 1.编译安装Nginx

[root@k8s-node-207 ~]# wget http://nginx.org/download/nginx-1.12.2.tar.gz
[root@k8s-node-207 ~]# yum -y install gcc gcc-c++ automake pcre pcre-devel zlib zlib-devel open openssl-devel #安装相关依赖包
[root@k8s-node-207 ~]# tar xf nginx-1.12.2.tar.gz 
[root@k8s-node-207 ~]# cd nginx-1.12.2/
[root@k8s-node-207 nginx-1.12.2]# ./configure  --prefix=/usr/local/nginx --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-threads  --with-pcre  --with-http_gzip_static_module  #设置编译参数，特别是--prefix
[root@k8s-node-207 nginx-1.12.2]# make && make install   
[root@k8s-node-207 nginx-1.12.2]# scp -r /usr/local/nginx  172.16.155.208:/usr/local/  #拷贝到另外一台Nginx服务器

2.配置Nginx为系统服务

[root@k8s-node-207 nginx-1.12.2]# vim /lib/systemd/system/nginx.service  #创建Nginx服务系统启动文件
[Unit]
Description=nginx
After=network.target
 
[Service]
Type=forking
ExecStart=/usr/local/nginx/sbin/nginx        #注意要替换为自己编译安装的路径
ExecReload=/usr/local/nginx/sbin/nginx -s reload
ExecStop=/usr/local/nginx/sbin/nginx -s quit
PrivateTmp=true
 
[Install]
WantedBy=multi-user.target

[root@k8s-node-207 nginx-1.12.2]# systemctl start  nginx  #测试脚本，启动
[root@k8s-node-207 nginx-1.12.2]# netstat -tnlp|grep :80  #检查端口
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      7834/nginx: master  
[root@k8s-node-207 nginx-1.12.2]# ps aux|grep nginx  #检查进程
root      7834  0.0  0.0  45956  1124 ?        Ss   16:24   0:00 nginx: master process /usr/local/nginx/sbin/nginx
nobody    7835  0.0  0.0  48484  1976 ?        S    16:24   0:00 nginx: worker process
root      7944  0.0  0.0 112720   968 pts/0    S+   16:25   0:00 grep -E --color=auto nginx
[root@k8s-node-207 nginx-1.12.2]# systemctl enable nginx  #设置开机自启
[root@k8s-node-207 nginx-1.12.2]# scp /lib/systemd/system/nginx.service 172.16.155.208:/lib/systemd/system/nginx.service  #拷贝到另一台机器
#在另一台机器上启动Nginx
[root@k8s-node-208 ~]# systemctl start nginx
[root@k8s-node-208 ~]# systemctl status nginx
[root@k8s-node-208 ~]# systemctl enable nginx

三、编译安装配置keepalived

1.编译安装keepalived

[root@k8s-node-207 ~]# wget https://www.keepalived.org/software/keepalived-2.0.12.tar.gz  #下载源码
[root@k8s-node-207 ~]# yum install -y openssl openssl-devel libnl libnl-devel  #安装依赖文件
[root@k8s-node-207 ~]# tar xf keepalived-2.0.12.tar.gz 
[root@k8s-node-207 ~]# cd keepalived-2.0.12/
[root@k8s-node-207 keepalived-2.0.12]# ./configure --prefix=/usr/local/keepalived  #只有编译安装的目录
[root@k8s-node-207 keepalived-2.0.12]# make && make install

2.配置keepalived master节点

[root@k8s-node-207 keepalived-2.0.12]# cd /usr/local/keepalived/etc/keepalived/  #进入keepalived配置目录
[root@k8s-node-207 keepalived]# cp keepalived.conf keepalived.conf-$(date +%F-%H:%M:%S)  #拷贝默认的配置
! Configuration File for keepalived
  
global_defs {  #默认该字段是配置发送邮件通知，由于我使用微信进行通知所以忽略
}
  
vrrp_script chk_http_port {  #配置服务的健康检查     
    script "/mnt/chk_nginx.sh"     #检查是使用的脚本路径
    interval 2      #监控间隔                
    weight -5       #每检测失败一次，如果weight大于0则当前节点的priority增加该配置的值，否则减少          
    fall 2          #执行几次才会认为是失败         
    rise 1          #执行多少次才会认为是成功         
}
  
vrrp_instance VI_1 {     
    state MASTER     #指定当前节点的初始状态
    interface eth0    #vrrp实例绑定的网卡接口 用于发送vrrp包  
    nopreempt         #设置为非抢占模式，优先级高的设置 解决优先级高的恢复后再次抢断 测试时可以先不配置
    virtual_router_id 51   #指定vrrp实例的ID 范围是0-255 主备节点必须一致      
    priority 101           #指定当前节点的优先级 优先级高的为MASTER        
    advert_int 1           #指定发送vrrp间隔时间  主备必须一致     
    authentication {    #主备必须一致          
        auth_type PASS       #指定认证方式 这里使用简单密码认证      
        auth_pass 1111       #指定认证使用的密码 最大为8位
    }
    virtual_ipaddress {           
        172.16.155.209  #指定VIP地址
    }
    notify_master "/root/script_dir/wechat.py master test keepalived状态发送改变,master切换至172.16.155.207"  #设置通知脚本路径及通知信息  此处根据自己实际情况自定义，此处配置不影响启动，如果没有告警通知可以稍后创建
    notify_backup "/root/script_dir/wechat.py backup test keepalived状态发送改变,backup切换至172.16.168.207" 
    notify_fault  "/root/script_dir/wechat.py fault  test keepalived发送故障,故障主机为：172.16.168.207"
    #以上配置为：当节点成为master时执行的操作  成为backup是执行的操作  当发生故障时执行的操作
track_script {      #监控脚本执行的状态               
   chk_http_port                     
}
}
[root@k8s-node-207 keepalived]# cd /usr/local/keepalived/etc/sysconfig/  #由于启动命令默认会去/etc/keepalived/下读取keepalived.conf，并且默认日志会写入/var/log/messages文件中，所以我们需要修改相关配置
[root@k8s-node-207 sysconfig]# cat keepalived
KEEPALIVED_OPTIONS="-f /usr/local/keepalived/etc/keepalived/keepalived.conf -S 0 -D"  #-f 指定配置文件路径 -S 指定日志路径 0 表示local0.* 
[root@k8s-node-207 sysconfig]# cat /etc/rsyslog.conf  #修改rsyslog配置文件
#Save keepalived log
local0.*                                                /var/log/keepalived.log  #指定日志文件路径
#暂时不拷贝至另一台服务器

 3.配置keepalived backup节点

#207上拷贝相关文件到208上
[root@k8s-node-207 sysconfig]# scp -r /usr/local/keepalived/ 172.16.155.208:/usr/local/  
[root@k8s-node-207 sysconfig]# scp /etc/rsyslog.conf 172.16.155.208:/etc/rsyslog.conf 
[root@k8s-node-207 sysconfig]# scp /lib/systemd/system/keepalived.service 172.16.155.208:/lib/systemd/system/keepalived.service #默认编译keepalived时会自动生成系统服务配置文件
[root@k8s-node-207 sysconfig]# systemctl restart rsyslog.service 

#208上修改配置文件为backup
[root@k8s-node-208 ~]# cd /usr/local/keepalived/etc/keepalived/
[root@k8s-node-208 keepalived]# vim keepalived.conf
! Configuration File for keepalived

global_defs {   #可自定义
}

vrrp_script chk_http_port {   #可自定义
    script "/mnt/chk_nginx.sh"
    interval 2
    weight -5
    fall 2
    rise 1
}

vrrp_instance VI_1 {
    state backup    #指定当前节点状态
    interface eth0
    nopreempt
    virtual_router_id 51   #确保与master保持一致
    priority 100           #确保小于master设置的值
    advert_int 1           #确保与master保持一致
    authentication {       #确保与master保持一致
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {   #确保与master保持一致
        172.16.155.209
    }
    notify_master "/root/script_dir/wechat.py master test keepalived状态发送改变,master切换至172.16.155.208"   #可自定义
    notify_backup "/root/script_dir/wechat.py backup test keepalived状态发送改变,backup切换至172.16.168.208"
    notify_fault  "/root/script_dir/wechat.py fault  test keepalived发送故障,故障主机为：172.16.168.208"

track_script {  #可自定义
   chk_http_port
}
}

默认编译后会自动生成系统服务配置文件，如果没有参考以下配置创建

[root@k8s-node-207 sysconfig]# vim /lib/systemd/system/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/keepalived/etc/sysconfig/keepalived
ExecStart=/usr/local/keepalived/sbin/keepalived $KEEPALIVED_OPTIONS
ExecReload=/bin/kill -HUP $MAINPID

[Install]
WantedBy=multi-user.target

创建Nginx状态检查脚本

[root@k8s-node-207 sysconfig]# cat /mnt/chk_nginx.sh
#!/bin/bash
ngix_status=`ps -C nginx --no-header |wc -l`
if [[ ${ngix_status} -eq 0 ]];then
    /usr/local/nginx/sbin/nginx
    sleep 2
    new_nginx_status=$(ps -C nginx --no-header |wc -l)
    if [[ ${new_nginx_status} -eq 0 ]];then
        killall keepalived
    fi
fi
[root@k8s-node-207 sysconfig]# scp /mnt/chk_nginx.sh 172.16.155.208:/mnt/chk_nginx.sh 
[root@k8s-node-207 sysconfig]# chmod +x /mnt/chk_nginx.sh
[root@k8s-node-207 sysconfig]# ssh 172.16.155.208 "chmod +x /mnt/chk_nginx.sh"

4.启动服务并检查当前状态

[root@k8s-node-207 sysconfig]# systemctl restart rsyslog.service   #重启rsyslog服务，使keepalived的日志配置生效
[root@k8s-node-207 sysconfig]# echo "k8s-node-207" > /usr/local/nginx/html/index.html  #修改Nginx index文件 稍后测试使用
[root@k8s-node-207 sysconfig]# systemctl start keepalived.service  #启动keepalived服务
#208上 同207操作
[root@k8s-node-208 keepalived]# systemctl restart rsyslog.service 
[root@k8s-node-208 keepalived]#  echo "k8s-node-208" > /usr/local/nginx/html/index.html
[root@k8s-node-208 keepalived]# systemctl start keepalived.service 

[root@k8s-node-207 sysconfig]# ip a|grep 172.16    #207上检查当前的IP地址
    inet 172.16.155.207/24 brd 172.16.155.255 scope global eth0
    inet 172.16.155.209/32 scope global eth0       #VIP地址当前绑定在当前主机eth0网卡上
[root@k8s-node-208 keepalived]# ip a|grep 172.16   #208上检查当前用有的IP地址 主要检查是否发生脑裂问题
    inet 172.16.155.208/24 brd 172.16.155.255 scope global eth0
[root@k8s-node-207 sysconfig]# curl http://172.16.155.209:80  #使用crul命令范围VIP查看访问到哪个节点 显示为207节点
k8s-node-207

 5.测试keepalived主从是否可以切换

[root@k8s-node-207 sysconfig]# systemctl stop  keepalived.service  #在207上关闭keepalived服务
[root@k8s-node-207 sysconfig]# ip a|grep 172.16  #查看207上的拥有的IP地址 VIP已经没有了
    inet 172.16.155.207/24 brd 172.16.155.255 scope global eth0
[root@k8s-node-208 keepalived]# ip a|grep 172.16 #查看208上的拥有的IP地址 VIP已经漂移到208上了
    inet 172.16.155.208/24 brd 172.16.155.255 scope global eth0
    inet 172.16.155.209/32 scope global eth0
[root@k8s-node-207 sysconfig]# curl http://172.16.155.209:80  #访问一下VIP 显示为208节点
k8s-node-208

 [root@k8s-node-207 sysconfig]# systemctl start keepalived.service  #207上重新启动keepalived
 [root@k8s-node-207 sysconfig]# ip a|grep 172.16                    #VIP没有漂移回来，符合预期，如果想在master恢复后VIP漂移回来则可以删除nopreempt配置
 inet 172.16.155.207/24 brd 172.16.155.255 scope global eth0

5.测试Nginx服务故障时keepalived是否可以切换

[root@k8s-node-208 mnt]# ip a|grep 172.16  #当前VIP在208上
    inet 172.16.155.208/24 brd 172.16.155.255 scope global eth0
    inet 172.16.155.209/32 scope global eth0
[root@k8s-node-208 mnt]# systemctl stop nginx  #关闭208上Nginx服务 稍等几秒钟
[root@k8s-node-208 mnt]# ip a|grep 172.16      #再次检查208上的IP，VIP已经没有了
    inet 172.16.155.208/24 brd 172.16.155.255 scope global eth0

[root@k8s-node-207 mnt]# ip a|grep 172.16   #207上查看，VIP已经漂移到207上了
    inet 172.16.155.207/24 brd 172.16.155.255 scope global eth0
    inet 172.16.155.209/32 scope global eth0