做网站思路,wordpress api文档下载,wordpress发布图片,怎么用模板做网站利用keepalived实现高可靠配置(HA) 2.1. 高可靠概念HA(High Available)#xff1a;高可用性集群#xff0c;是保证业务连续性的有效解决方案#xff0c;一般有两个或两个以上的节点#xff0c;且分为活动节点及备用节点。2.2. 高可靠软件keepalivedkeepalive是一款可以实现…利用keepalived实现高可靠配置(HA) 2.1. 高可靠概念HA(High Available)高可用性集群是保证业务连续性的有效解决方案一般有两个或两个以上的节点且分为活动节点及备用节点。2.2. 高可靠软件keepalivedkeepalive是一款可以实现高可靠的软件通常部署在2台服务器上分为一主一备。Keepalived可以对本机上的进程进行检测一旦Master检测出某个进程出现问题将自己切换成Backup状态然后通知另外一个节点切换成Master状态。2.3. keepalived安装 下载keepalived官网http://keepalived.org 将keepalived解压到/usr/local/src目录下tar -zxvf keepalived-1.2.19.tar.gz -C /usr/local/src进入到/usr/local/src/keepalived-1.2.19目录cd /usr/local/src/keepalived-1.2.19开始configure(检查安装环境,并指定将来要安装的路径)./configure --prefix/usr/local/keepalived #编译并安装make make install2.4. 将keepalived添加到系统服务中 拷贝执行文件cp /usr/local/keepalived/sbin/keepalived /usr/sbin/将init.d文件拷贝到etc下加入开机启动项cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/keepalived 将keepalived文件拷贝到etc下cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/创建keepalived文件夹mkdir -p /etc/keepalived将keepalived配置文件拷贝到etc下cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf 添加可执行权限chmod x /etc/init.d/keepalived添加keepalived到开机启动chkconfig --add keepalived chkconfig keepalived on2.4. 配置keepalived虚拟IP1.基本服务器宕机的主从切换配置 两台nginx服务器分别安装keepalived配置/etc/keepalived/keepalived.conf主从配置 主nginx修改配置文件 /etc/keepalived/keepalived.conf #MASTER节点#全局配置global_defs { notification_email { #指定keepalived在发生切换时需要发送email到的对象一行一个 XXXXXX.com } notification_email_from Alexandre.Cassenfirewall.loc #指定发件人 smtp_server 192.168.200.1 #指定smtp服务器地址 smtp_connect_timeout 30 #指定smtp连接超时时间 router_id LVS_DEVEL #运行keepalived机器的一个标识}vrrp_instance VI_1 { state MASTER #指定A节点为主节点 备分机上设置为BACKUP即可 interface eth0 #设置实例绑定的网卡 virtual_router_id 51 #VRRP组名两个节点的设置必须一样以指明各个节点属于同一VRRP组(同一实例下virtual_router_id必须相同) priority 100 #主节点的优先级(1-254之间)备用节点必须比主节点优先级低 advert_int 1 #MASTER与BACKUP负载均衡器之间同步检查的时间间隔单位是秒 authentication { #设置验证信息两个节点必须一致 auth_type PASS #主从服务器验证方式 auth_pass 1111 } virtual_ipaddress { #指定虚拟IP, 两个节点设置必须一样 192.168.232.203/24 #如果两个nginx的ip分别是192.168.232.201,,...205则此处的虚拟ip跟它俩同一个网段即可,24子网掩码(255.255.255.0)可以多个虚拟IP换行即可 }}备nginx修改备nginx下/etc/keepalived/keepalived.conf文件配置备nginx时需要注意需要修改state为BACKUP , priority比MASTER低virtual_router_id和master的值一致#BACKUP节点global_defs {}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 { 192.168.232.203/24 }}#分别启动两台机器上的keepalivedtail /var/log/message 查看日志。service keepalived start 用ip addr查看主从主机备机此时如果主机宕机则(service keepalived stop)备机会顶替主机获得虚拟ip首先将主机的keepalived关闭再次查看主机ip addr备机至此基本服务器宕机的主从切换配置完毕访问虚拟ip是不是还能轮询访问tomcat2.基于nginx进程死掉的主从切换配置 keepalived是通过检测keepalived进程是否存在判断服务器是否宕机如果keepalived进程在但是nginx进程不在了那么keepalived是不会做主备切换所以我们需要写个脚本来监控nginx进程是否存在如果nginx不存在就将keepalived进程杀掉。在主nginx上需要编写nginx进程检测脚本(check_nginx.sh)判断nginx进程是否存在如果nginx不存在就将keepalived进程杀掉check_nginx.sh内容如下#!/bin/bash# 如果进程中没有nginx则将keepalived进程kill掉Aps -C nginx --no-header |wc -l ## 查看是否有 nginx进程 把值赋给变量A if [ $A -eq 0 ];then ## 如果没有进程值得为 零 service keepalived stop ## 则结束 keepalived 进程fi将check_nginx.sh拷贝至/etc/keepalived下注意修改/etc/keepalived/check_nginx.sh的可执行权限修改主nginx的keepalived.conf添加脚本定义检测注意下边红色标识地方#全局配置global_defs { notification_email { #指定keepalived在发生切换时需要发送email到的对象一行一个 XXXXXX.com } notification_email_from miaoruntuitcast.cn #指定发件人 #smtp_server XXX.smtp.com #指定smtp服务器地址 #smtp_connect_timeout 30 #指定smtp连接超时时间 router_id LVS_DEVEL #运行keepalived机器的一个标识}vrrp_script check_nginx { script /etc/keepalived/check_nginx.sh ##监控脚本 interval 2 ##时间间隔2秒 weight 2 ##权重}vrrp_instance VI_1 { state MASTER #标示状态为MASTER 备份机为BACKUP interface eth0 #设置实例绑定的网卡 virtual_router_id 51 #同一实例下virtual_router_id必须相同 priority 100 #MASTER权重要高于BACKUP 比如BACKUP为99 advert_int 1 #MASTER与BACKUP负载均衡器之间同步检查的时间间隔单位是秒 authentication { #设置认证 auth_type PASS #主从服务器验证方式 auth_pass 8888 } track_script { check_nginx #监控脚本 } virtual_ipaddress { #设置vip 192.168.101.100 #可以多个虚拟IP换行即可 }}修改后重启keepalived
