nfs 研究双机热备记录

实现说明：两台服务器分别为nfs1,nfs2

nfs1 192.168.104.144

nfs2 192.168.104.145

vip 192.168.104.200

使用nfs+rsync+inotify+keepalived等工具

关闭防火墙和selinux，保证主机名能解析，设置好ssh互信

两台服务器：

# yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm      

# yum -y install nfs-utils  keepalived  rsync inotify-tools      

设置nfs:

# systemctl enable --now nfs

# mkdir  /home/data1
# chown -R 36:36 /home/data   #此处赋予拥有用户和组根据个人需求
# vi /etc/exports
/home/data  *(rw,sync,no_subtree_check,all_squash,anon_uid=36,anon_gid=36
# systemctl restart nfs      

设置rsync和inotify

注意：syncd服务不能手动启动，否则会两台服务器冲突      

# vi /etc/rsyncd.conf
 log file = /var/log/rsyncd.log
 pid file = /var/run/rsyncd.pid
 lock file = /var/run/rsyncd.lock
 secrets file = /etc/rsync.password
[etc_from_client]
path = /home/data1
 comment = sync etc from client
 uid = root
 gid = root
 port = 873
 ignore errors
 use chroot = no
 read only = no
 list = no
 max connections = 200
 timeout = 600
 auth users = vdsm      

# vi /etc/rsync.password 
 vdsm:123456      

# vi /etc/rsync.auth
123456      

# chmod 600 /etc/rsync.*    #注意权限必须是600否则后面验证密码会失败      

创建脚本存放路径

# mkdir /scripts/      

设置自动同步数据

# vi /scripts/inotify.sh      

#!/bin/bash
host=192.168.104.145       #nfs2的话设置192.168.104.144
 src=/home/data1/            #注意后面要斜杠，否则会将目录data1目录同步
 des=etc_from_client
 auth=/etc/rsync.auth
 user=vdsm
 inotifywait=/usr/bin/inotifywait
 $inotifywait -mrq --timefmt '%Y%m%d %H:%M' --format '%T %w%f%e' -e modify,delete,create,attrib $src 
 | while read files ;do
 rsync -avzP --delete --timeout=100 --password-file=${auth} $src $user@$host::$des


echo "${files} was rsynced" >> /tmp/rsync.log 2>&1
 done      

# chown -R 755 /scripts/           

#设置开机自动执行脚本

# chmod +x /etc/rc.d/rc.local              

# vi /etc/rc.d/rc.local
nohup sh /scripts/inotify.sh &      

keepalived 的配置      

主nfs1:
# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    notification_email {
         [email protected]
    }
    notification_email_from [email protected]
    smtp_server 127.0.0.1
    smtp_connect_timeout 30
    router_id nfs1
    vrrp_skip_check_adv_addr
 }
 vrrp_script monitor_nfs_status {
         script "/scripts/monitor_nfs_status.sh"
         interval 5
         fall 3
         rise 1
         weight -15
 }

vrrp_instance VI_1 {
     state BACKUP
     interface ens33
     virtual_router_id 55
     priority 100
     advert_int 1
     nopreempt
     authentication {
         auth_type PASS
         auth_pass 1111
     }

 virtual_ipaddress {     192.168.104.200/24 }
 
 track_script {
         monitor_nfs_status
         }
 
 track_interface {
         ens33
         }
     notify_master "/scripts/keepalived_notify.sh master"
     notify_backup "/scripts/keepalived_notify.sh backup"
     notify_fault  "/scripts/keepalived_notify.sh fault"
     notify_stop   "/scripts/keepalived_notify.sh stop"
 }       

备nfs2:
 # vi /etc/keepalived/keepalived.conf

 ! Configuration File for keepalived 
global_defs {
    notification_email {
         [email protected]
    }
    notification_email_from [email protected]
    smtp_server 127.0.0.1
    smtp_connect_timeout 30
    router_id nfs2
    vrrp_skip_check_adv_addr
 }
 vrrp_script monitor_nfs_status {
         script "/scripts/monitor_nfs_status.sh"
         interval 5
         fall 3
         rise 1
         weight -15
 }

 vrrp_instance VI_1 {
     state BACKUP
     interface ens33
     virtual_router_id 55
     priority 90
     advert_int 1
     authentication {
         auth_type PASS
         auth_pass 1111
     }
     virtual_ipaddress {
         192.168.104.200/24
     }
 track_script {
         monitor_nfs_status
 }
 
 track_interface {
         ens33
     }
     notify_master "/scripts/keepalived_notify.sh master"
     notify_backup "/scripts/keepalived_notify.sh backup"
     notify_fault  "/scripts/keepalived_notify.sh fault"
     notify_stop   "/scripts/keepalived_notify.sh stop" 
 }       

两台服务器：

设置keepalive检测脚本
 # vi /scripts/keepalived_notify.sh
 #!/bin/bash 
master() {
     systemctl status nfs
     if [ $? -ne 0 ];then
         systemctl restart nfs
     fi
     systemctl status rsyncd
     if [ $? -eq 0 ];then
         systemctl stop rsyncd
     fi
 }

 backup() {
     systemctl status nfs
     if [ $? -ne 0 ];then
         systemctl restart nfs
     fi
     systemctl status rsyncd
     if [ $? -ne 0 ];then
         systemctl restart rsyncd
     fi
 }
 
 
 fault() {
     systemctl status nfs
     if [ $? -ne 0 ];then
         systemctl restart nfs
     fi
     if [ $? -eq 0 ];then
         systemctl stop rsyncd
     fi
 }
 
 case $1 in
     master)
         master
     ;;
     backup)
         backup
     ;;
     fault)
         fault
         systemctl restart keepalived
     ;;
     stop)
         backup
         systemctl restart keepalived
     ;;
     *)
         echo $"Usage: $0 {master|backup|fault|stop}"
 esac
 ~ 

      

# vi /scripts/monitor_nfs_status.sh
!/bin/bash
 systemctl status nfs &>/dev/null
 if [ $? -eq 0 ];then
 
systemctl status rpcbind &>/dev/null     
      if [ $? -eq 0 ];then             
            exit 0     
        fi     
     exit 2
 else
         systemctl restart nfs &> /dev/null
         if [ ps -C nfsd --no-header | wc -l -ne 0 ];then
         pkill keepalived && exit 1
         fi
 fi      

# chown -R 755 /scripts/        

由于想nfs1作为主，且keepalived设置了当存在master不抢占

建议nfs1 先执行 systemctl enable --now keepalived

之后nfs2 再执行 systemctl enable --now keepalived

#由于本人都是测试完再写的，很可能哪里写错或者漏写,可以查看tail -f /var/log/rsyncd.log 和message日志，有问题的话可以留言告诉我