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NFS高可用目的

部署NFS双机热备高可用环境，用作K8S容器集群的远程存储，实现K8S数据持久化。

NFS高可用思路

NFS + Keepalived 实现高可用，防止单点故障。
Rsync+Inotify 实现主备间共享数据进行同步

技术要求

两个NFS节点机器的配置要一致
keepalived监控nfs进程，master的nfs主进程宕掉无法启动时由slave的nfs接管继续工作。
k8s数据备份到slave，同时master和slave数据用rsync+inotify实时同步，保证数据完整性。
生产环境下，最好给NFS共享目录单独挂载一块硬盘或单独的磁盘分区。

环境准备

### 关闭防火墙
systemctl stop firewalld.service
systemctl disable firewalld.service
###关闭selinux
setenforce 0    ##临时关闭
vi /etc/selinux/config   ##永久关闭

NFS高可用部署

一、安装部署NFS服务（Master和Slave两机器同样操作）

1）安装nfs
yum -y install nfs-utils
2）创建nfs共享目录
  mkdir /data/k8s_storage

3）编辑export文件，运行k8s的node节点挂载nfs共享目录
  vim /etc/exports
  /data/k8s_storage 10.90.12.0/24(rw,sync,no_root_squash)

4）配置生效
   exportfs -r

5）查看生效
   exportfs

6）启动rpcbind、nfs服务
  systemctl enable rpcbind --now
  systemctl enable nfs --now

7）查看 RPC 服务的注册状况
   rpcinfo -p localhost

8）showmount测试
Master节点测试
  showmount -e masterIP


Slave节点测试
  showmount -e SlaveIP

二、安装部署keepalived（Master和Slave两机器同样操作）

1）安装keepalived
   yum -y install keepalived

2）Master节点的keepalived.conf配置(设置keepalived为非抢占模式，如果设置成抢占模式会在不断的切换主备时容易造成NFS数据丢失。)
# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf_bak
# >/etc/keepalived/keepalived.conf
# vim /etc/keepalived/keepalived.conf
global_defs {
    router_id nfs
}
vrrp_script chk_nfs {
    script "/etc/keepalived/nfs_check.sh"
    interval 2
    weight -20
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens192
    virtual_router_id 61
    priority 100
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    track_script {
        chk_nfs
    }
    virtual_ipaddress {
        10.90.12.30/24
    }
}

3）Slave节点的keepalived.conf配置
global_defs {
    router_id nfs
}
vrrp_script chk_nfs {
    script "/etc/keepalived/nfs_check.sh"
    interval 2
    weight -20
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens192
    virtual_router_id 61
    priority 100
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    track_script {
        chk_nfs
    }
    virtual_ipaddress {
        10.90.12.30/24
    }
}

4）编辑nfs_check.sh监控脚本
# vi /etc/keepalived/nfs_check.sh
#!/bin/bash

for i in `seq 14`;do

  counter=`ps -aux | grep '\[nfsd\]' | wc -l`
  KEEP = `ps -ef | grep keepalived | wc -l`
  if [ $counter -eq 0 ];then

    sudo systemctl restart nfs

  fi

  sleep 2

  counter=`ps -aux | grep '\[nfsd\]' | wc -l`

  if [ $counter -eq 0 ];then

    systemctl stop keepalived.service

  else

      if [ $KEEP -eq 0 ]; then

         systemctl start keepalived

      fi

  fi

  sleep 2

done

设置脚本执行权限
# chmod 755 /etc/keepalived/nfs_check.sh

5）启动keepalived服务
# systemctl enable keepalived.service --now

查看服务进程是否启动
# ps -ef|grep keepalived

三、安装部署Rsync+Inofity（Master和Slave两机器都要操作）

1）安装rsync和inotify
  # yum -y install rsync inotify-tools

2）Master节点机器配置rsyncd.conf
# cp /etc/rsyncd.conf /etc/rsyncd.conf_bak
# >/etc/rsyncd.conf
# vim /etc/rsyncd.conf
uid = root
gid = root
use chroot = no
port = 873
hosts allow = 10.90.12.0/24
max connections = 0
timeout = 300
pid file = /var/run/rsyncd.pid
lock file = /var/run/rsyncd.lock
log file = /var/log/rsyncd.log
log format = %t %a %m %f %b
transfer logging = yes
syslog facility = local3

[master_nfs]
path = /data/k8s_storage
comment = master_nfs
ignore errors
read only = no
list = no
auth users = nfs
secrets file = /opt/rsync_salve.pass

编辑密码和用户文件（格式为"用户名:密码"）
# vim /opt/rsync_salve.pass
nfs:nfs123

编辑同步密码
该文件内容只需要填写从服务器的密码，例如这里从服务器配的用户名密码都是nfs:nfs123，则主服务器同步密码写nfs123一个就可以了
vi /opt/rsync.pass
设置文件执行权限
# chmod 600 /opt/rsync_salve.pass
# chmod 600 /opt/rsync.pass

启动服务
# systemctl enable rsyncd --now

3）Slave节点机器配置rsyncd.conf
就把master主机/etc/rsyncd.conf配置文件里的[master_nfs]改成[slave_nfs]
其他都一样，密码文件也设为一样

4）手动验证下Master节点NFS数据同步到Slave节点
在Master节点的NFS共享目录下创建测试数据
# mkdir /data/k8s_storage/test
# touch /data/k8s_storage/{a,b}

手动同步Master节点的NFS共享目录数据到Slave节点的NFS共享目录下
# rsync -avzp --delete /data/k8s_storage/ nfs@slaveIP::slave_nfs --password-file=/opt/rsync.pass

到Slave节点查看是否同步
# ls /data/k8s_storage/

上面rsync同步命令说明：文章来源地址https://www.toymoban.com/news/detail-536667.html

/data/k8s_storage/ 是同步的NFS共享目录
nfs@slaveIP::slave_nfs
- nfs 是Slave节点服务器的/opt/rsync_salve.pass文件中配置的用户名
- slaveIP为Slave节点服务ip
- slave_nfs 为Slave服务器的rsyncd.conf中配置的同步模块名
- –password-file=/opt/rsync.pass 是Master节点同步到Slave节点使用的密码文件，文件中配置的是Slave节点服务器的/opt/rsync.pass文件中配置的密码

四、设置Rsync+Inotify自动同步

1. 配置Inotify自动同步

1) 编写自动同步脚本
# vi /usr/local/nfs_rsync/rsync_inotify.sh
#!/bin/bash
host=slaveIP  #修改为slave真实IP
src=/data/k8s_storage/
des=slave_nfs
password=/opt/rsync.pass
user=nfs
inotifywait=/usr/bin/inotifywait
$inotifywait -mrq --timefmt '%Y%m%d %H:%M' --format '%T %w%f%e' -e modify,delete,create,attrib $src \
| while read files ;do
rsync -avzP --delete --timeout=100 --password-file=${password} $src $user@$host::$des
echo "${files} was rsynced" >>/tmp/rsync.log 2>&1
done

2) 配置systemctl管理自动同步脚本
   - 编写systemctl启动脚本
     # vi /usr/local/nfs_rsync/rsync_inotify_start.sh
	 #!/bin/bash
     nohub=/usr/bin/nohup
     nohup sh /usr/local/nfs_rsync/rsync_inotify.sh >> /var/log/rsynch.log 2>&1 &
   - 编写systemctl停止脚本
     # vi /usr/local/nfs_rsync/rsync_inotify_stop.sh
	 #!/bin/bash
     for i in `ps -ef | grep rsync_inotify.sh | awk '{print $2}'`

     do

       kill -9 $i

	 done
    - 编写systemctl管理程序
	  #vi /usr/lib/systemd/system/nfs_rsync.service
	  [Unit]
      Description=rsync_inotify service
      Documentation=This is a Minio Service.

      [Service]
      Type=forking
      TimeoutStartSec=10
      WorkingDirectory=/usr/local/nfs_rsync
      User=root
      Group=root
      Restart=on-failure
      RestartSec=15s
      ExecStart=/usr/local/nfs_rsync/rsync_inotify_start.sh
      ExecStop=/usr/local/nfs_rsync/rsync_inotify_stop.sh

      [Install]
      WantedBy=multi-user.target

3) slave节点自动同步脚本（其他配置与上面保持一致）
# vi /usr/local/nfs_rsync/rsync_inotify.sh
#!/bin/bash
host=MsterIP   #修改为master真实IP
src=/data/k8s_storage/
des=master_nfs
password=/opt/rsync.pass
user=nfs
inotifywait=/usr/bin/inotifywait
$inotifywait -mrq --timefmt '%Y%m%d %H:%M' --format '%T %w%f%e' -e modify,delete,create,attrib $src \
| while read files ;do
rsync -avzP --delete --timeout=100 --password-file=${password} $src $user@$host::$des
echo "${files} was rsynced" >>/tmp/rsync.log 2>&1
done

4) 启动Inotify程序
systemctl enable nfs_rsync.service --now

2. 配置keepalived VIP监控（master与slave同样配置）

1)编写VIP监控脚本
# vi /usr/local/vip_monitor/vip_monitor.sh
#!/bin/bash
while :

do

  VIP_NUM=`ip addr|grep 10.90.12.30|wc -l`
  RSYNC_INOTIRY_NUM=`ps -ef|grep /usr/bin/inotifywait|grep -v grep|wc -l`

  if  [ ${VIP_NUM} == 0 ];then

      echo "VIP不在当前NFS节点服务器上" > /tmp/1.log
      if [ ${RSYNC_INOTIRY_NUM} != 0 ];then

          systemctl stop nfs_rsync.service

      fi

  else

      echo "VIP在当前NFS节点服务器上" >/dev/null 2>&1
      systemctl start nfs_rsync.service

  fi

  sleep 20

done

2) 配置systemctl管理VIP监控脚本
  - 编写systemctl启动脚本
    # vi /usr/local/vip_monitor/vip_monitor_start.sh
    #!/bin/bash
    nohub=/usr/bin/nohup
    nohup sh /usr/local/vip_monitor/vip_monitor.sh >> /var/log/vip_monitor.log 2>&1 &
  - 编写systemctl停止脚本
    # vi /usr/local/vip_monitor/vip_monitor_stop.sh
    #!/bin/bash
    ps -ef | grep vip_monitor.sh | grep -v "grep" | awk '{print $2}' | xargs kill -9
  - 编写systemctl管理程序
    # vi /usr/lib/systemd/system/vip_monitor.service
	[Unit]
    Description=rsync_inotify service
    Documentation=This is a Minio Service.

    [Service]
    Type=forking
    TimeoutStartSec=10
    WorkingDirectory=/usr/local/vip_monitor
    User=root
    Group=root
    Restart=on-failure
    RestartSec=15s
    ExecStart=/usr/local/vip_monitor/vip_monitor_start.sh
    ExecStop=/usr/local/vip_monitor/vip_monitor_stop.sh

    [Install]
    WantedBy=multi-user.target

3) 启动Inotify程序
systemctl enable vip_monitor.service --now

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