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标题: 【成都校区*网关高可用之keepavlived全流程】 [打印本页]
作者: 小蜀哥哥 时间: 2019-9-19 14:35
标题: 【成都校区*网关高可用之keepavlived全流程】
1.场景描述因为要做网关的高可用，用到了keepalived+nginx，来保证nginx的高可用。
2. 解决方案2.1 安装keepalived2.1.1 安装相关依赖包[Bash shell] 纯文本查看 复制代码
[root@t-ruanjianlaowang ~]# yum install -y libnl*
[root@t-ruanjianlaowang ~]# yum install -y libnfnetlink-devel zlib zlib-devel gcc gcc-c++ openssl openssl-devel openssh
假如连不了，网上也有这些包的下载，下载后tar解压也行。
2.1.2 下载并安装keepalived我们使用的最新版本：keepalived-2.0.18.tar.gz，993k
[AppleScript] 纯文本查看 复制代码
tar -zxvf keepalived-2.0.18.tar.gz
cd keepalived-2.0.18/
./configure --prefix=/usr/local/keepalived
make
make install
[AppleScript] 纯文本查看 复制代码
[root@t-ruanjianlaowang ~]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/keepalived
[root@t-ruanjianlaowang ~]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/keepalived
[root@t-ruanjianlaowang ~]# cp /root/tools/keepalived-2.0.18/keepalived/etc/init.d/keepalived /etc/init.d/keepalived
#/etc/keepalived下好像有了keepalived文件夹，有了就不用mkdir了
[root@t-ruanjianlaowang ~]# mkdir /etc/keepalived
[root@t-ruanjianlaowang ~]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
2.1.4 设置开机启动
[AppleScript] 纯文本查看 复制代码
# 设置开机启动
[root@t-ruanjianlaowang ~]# chkconfig keepalived on
[root@t-ruanjianlaowang ~]# service keepalived start|stop|restart
到这里仅仅是keepalived安装完成，接下来还要根据项目项目配置keepalived.conf信息。
2.2 配置文件修改2.2.1 master的conf配置文
[AppleScript] 纯文本查看 复制代码
vi cd /etc/keepalived/keepalived.conf
!Configuration File for keepalived
global_defs {
router_id RUANJIANLAOWANG_MASTER
}
vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh"
interval 2
weight -20
}
vrrp_instance VI_1 {
state MASTER
interface ens666 #这里必须非常注意
virtual_router_id 81 #这个会在backup机器上用到
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_nginx
}
virtual_ipaddress {
10.192.168.21
}
}
2.2.2 还有个检查nginx是否挂掉的sh，也上传下
[AppleScript] 纯文本查看 复制代码
vi nginx_check.sh
#!/bin/bash
counter=$(ps -C nginx --no-heading|wc -l)
if [ "${counter}" = "0" ]; then
/usr/sbin/nginx
sleep 2
counter=$(ps -C nginx --no-heading|wc -l)
if [ "${counter}" = "0" ]; then
/etc/init.d/keepalived stop
fi
fi
2.2.3 backup机器上conf文件
[AppleScript] 纯文本查看 复制代码
/bin/bash: Configuration: command not found
bal_defs {
router_id RUANJIANLAOWANG2
}
vrrp_script chk_nginx {
script "/etc/keepalived/nginx_check.sh" ## 检测 nginx 状态的脚本路径
interval 2 ## 检测时间间隔
weight -20 ## 如果条件成立，权重-20
}
vrrp_instance VI_1 {
state BACKUP
interface ens168
virtual_router_id 81
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 111track_script {
chk_nginx ## 执行 Nginx 监控的服务
}
virtual_ipaddress {
10.192.168.21
}
}
这里记着也把检查nginx的sh文件上传上，跟master上的一样。
2.3 启动（1）配置完成后开始启动
[AppleScript] 纯文本查看 复制代码
[root@t-ruanjianlaowang ~]# service keepalived start
（2）启动过程中，打开日志看一下（刚开始可能会有问题，看下日志啥都明白了）
[AppleScript] 纯文本查看 复制代码
[root@t-ruanjianlaowang ~]# tail -f /var/log/messages
（3）假如启动不了，可以尝试以下方式
[AppleScript] 纯文本查看 复制代码
[root@t-ruanjianlaowang ~]# systemctl daemon-reload
#上面试过后，不行再重新注册服务
[root@t-ruanjianlaowang ~]#chkconfig --del keepalived
[root@t-ruanjianlaowang ~]# cd /usr/lib/systemd/system/
[root@t-ruanjianlaowang ~]#rm -rf keepalived.service
[root@t-ruanjianlaowang ~]# chkconfig --add keepalived
[AppleScript] 纯文本查看 复制代码
[root@t-ruanjianlaowang ~]#ip addr show ens666
[root@t-ruanjianlaowang ~]#ip addr show ens168
ens666、ens168为网卡名称
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