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-fpmnginx:
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 nginxkeepalive:
1）安装
yum install keepalived -y2）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BACKUPinterface 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 1authentication {auth_type PASSauth_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" ];thenexit 0
elseexit 1
fisystemctl daemon-reload 
systemctl start keepalived 
systemctl enable keepalived浏览器访问虚拟IP地址