1. server高可用-默认HA

1.部署zabbix单节点后，配置添加HANodeName和NodeAddress即为HA架构
2.zabbix1故障后切换zabbix2使用
3.浏览器访问主机1，使用主机1php前端连接mysql后zabbix2提供后台服务

---------------------------------------------------------
HA 集群状态：
      active         正常
      standby        待机
      unavailable    不可用
     stopped         停用

# 查看HA状态
zabbix_server -R ha_status 

# 切换细节
主节点和备节点每5秒更新一次上次访问时间。每个备节点监控主节点的最后一次访问时间。
如果主节点的最后一次访问时间超过了“故障转移延迟”秒，备用节点将自己切换为主节点，
并将“unavailable”状态分配给先前的主节点。

# 修改切换时间（10s-15min）
zabbix_server -R ha_set_failover_delay=5m

命令查看HA状态：

单节点配置HA：

两节点完成HA配置：

切换，手动停1节点：

切换，手动停1节点，2节点日志显示standby切换为active：

2. 访问高可用

php：
# cp /etc/opt/remi/php74/php-fpm.d/www.conf  \
/etc/opt/remi/php74/php-fpm.d/www.conf.bk
# sed -i 's/user = apache/user = nginx/' \
 /etc/opt/remi/php74/php-fpm.d/www.conf  
# sed -i 's/group = apache/group = nginx/' \
 /etc/opt/remi/php74/php-fpm.d/www.conf  
# cat /etc/opt/remi/php74/php-fpm.d/www.conf|grep nginx|grep -v "^;"

# sed -i 's/127\.0\.0\.1:9000/192\.168\.20\.61:9000/' \
/etc/opt/remi/php74/php-fpm.d/www.conf
# sed -i 's/127\.0\.0\.1/192\.168\.20\.61,192\.168\.20\.62/' \
/etc/opt/remi/php74/php-fpm.d/www.conf
# cat /etc/opt/remi/php74/php-fpm.d/www.conf|grep listen|grep -v "^;"

# systemctl restart php74-php-fpm
# systemctl status php74-php-fpm


nginx:
upstream PHP74_WEB {
    server 192.168.20.61:9000 max_fails=1 fail_timeout=10s;
    server 192.168.20.62:9000 max_fails=1 fail_timeout=10s;
}

server {
    listen       80;
    server_name  192.168.20.62;
location / {
    root /data/zabbix/php;
    try_files $uri $uri/ /index.php?query_string;
    index index.php index.html index.htm;
    }
location ~ .php$ {
    root   /data/zabbix/php;
    fastcgi_pass   PHP74_WEB;
    fastcgi_index  index.php;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include        fastcgi_params;
    }
}   

systemctl restart nginx


keepalive:
1）安装
yum install keepalived -y

2）配置
cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bk 
/etc/keepalived/keepalived.conf
global_defs {
   router_id LVS_DEVEL
}
vrrp_script chk_http_port {
       script "/root/check_kp.sh"                
       interval 2                             
       weight -20                                
}
vrrp_instance VI_1 {
    state BACKUP                # 两台都是BACKUP
    interface enp4s0            # 注意修改网卡信息
    virtual_router_id 49        # 同一网络环境下该值不要设置一样(同一套kp一致)
    priority 95                 # 两台权重不一致，一台要高 
    mcast_src_ip 192.168.xx.xx  # 修改服务ip地址
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
        track_script {
              chk_http_port                                   
        }
    virtual_ipaddress {
        192.168.30.141           # 虚拟IP地址
    }      
}

3）检测脚本
/root/check_kp.sh   # 给执行权限[不能和kp配置文件放一起，亲测无效]
#!/bin/bash
nginx_master=$(ps -ef | grep -v grep | grep nginx| grep master)
if [ -n "$nginx_master" ];then
    exit 0
else
    exit 1
fi


systemctl daemon-reload 
systemctl start keepalived 
systemctl enable keepalived


浏览器访问虚拟IP地址