查看“Nfs实现日志集中查看”的源代码

=* 起因=
 2019年10月24日 星期四 17时57分55秒 CST
程序哥要登录一台机器看所有javalog 但是有些机器跑的程序日志名是一样的 于是只能是 多个 nfs server  一个client 然后登录client机器就可以查看6台机的log  

client 172.31.27.83
server java02(172.31.25.239), java03(172.31.16.171) ,04,05,06 加上01自己 一共6台机器

=* server install=
==** java2==
<pre>yum -y install nfs-utils rpcbind
firewall-cmd --add-service=nfs --permanent --zone=public
systemctl  enable  rpcbind

systemctl enable nfs-server
systemctl start  nfs-server
# nfs client ip 
echo "/data/logs/hello/ 172.31.27.83(rw,sync,no_root_squash)" >> /etc/exports

systemctl  restart  rpcbind

exportfs -arv

#其它几台机器是一样的 在此就不写上了
</pre>

=client=
==* client  inst==
 yum -y install nfs-utils
 
 apt-get install nfs-common#debina

==config==
===4java02===
<pre>
mkdir  -p /data/logs/java02/hello/
mount 172.31.25.239:/data/logs/hello/  /data/logs/java02/hello/

记得加入 fstab
172.31.27.83:/data/logs/hello/  /home/logs/java01/hello nfs defaults 0 0
172.31.25.239:/data/logs/hello/  /home/logs/java02/hello nfs defaults 0 0
172.31.16.171:/data/logs/hello/  /home/logs/java03/hello nfs defaults 0 0


</pre>
=== 4java03 ===
<pre>
mkdir  -p /data/logs/java02/hello/
mount 172.31.16.171:/data/logs/hello/  /data/logs/java02/hello/

</pre>

其它一致，在此不写
mount 172.31.16.171:/data/logs/hello/  /data/logs/java03/hello/
mount.nfs: access denied by server while mounting 172.31.16.171:/data/logs/hello/


</pre>


=** 挂只读  pass=
<pre>
设置输出目录只读：ro

/data/logs/hello/ 172.31.27.83(ro,sync,no_root_squash)
systemctl  restart nfs-server 

sync：将数据同步写入内存缓冲区与磁盘中，效率低，但可以保证数据的一致性； </pre>

=troubleshooting=
==on nfs server==
<pre>
# 不然会 showmount -e 没东西  
mount  172.31.26.183:/data/logs/hello/  /data/logs/java04/hello/
mount.nfs: access denied by server while mounting 172.31.26.183:/data/logs/hello/</pre>