Nginx cluster load balancer

Experimental environment:

10.10.204.62 Load Balancing

10.10.204.63 Nginx Web server

10.10.204.64 Nginx Web server

10.10.204.65 File Storage

1.File Storage server installation

yum -y install nfs-utils

2. Configure NFS and create a shared directory

# mkdir -p /Data/webapp
# vim /etc/exports

/Data/webapp 10.10.204.0/24(rw,sync,no_subtree_check,no_root_squash)

3. Turn on auto-start

# systemctl enable rpcbind
# systemctl enable nfs-server
# systemctl start rpcbind
# systemctl start nfs

4.Related parameters:

rw：read-write：可读写； ro：read-only，只读； sync：文件同时写入硬盘和内存。
no_root_squash：来访的root用户保持root帐号权限；显然开启这项是不安全的。
root_squash：将来访的root用户映射为匿名用户或用户组；通常它将使用nobody或nfsnobody身份。
all_squash：所有访问用户都映射为匿名用户或用户组；
anonuid：匿名用户的UID值，可以在此处自行设定。 anongid：匿名用户的GID值。
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。
async：文件暂存于内存，而不是直接写入内存。
no_subtree_check ：即使输出目录是一个子目录，nfs服务器也不检查其父目录的权限，这样可以提高效率。

5.File Storage server firewall configuration

# firewall-cmd --permanent --add-service=rpc-bind
# firewall-cmd --permanent --add-service=nfs
# firewall-cmd --reload

6.Nginx Web server server installation and mounting

# yum -y install nfs-utils
# mkdir -p /Data/webapp
# mount -t nfs 10.10.204.65:/Data/webapp /Data/webapp

7. If you need to automatically mount it at boot, just add a line at the bottom of the file

# vim /etc/fstab
10.10.204.65:/Data/webapp /Data/webapp nfs auto,rw,vers=3,hard,intr,tcp,rsize=32768,wsize=32768 0 0
 

8.Nginx Web server server test
Continuously write 16384 16KB blocks to the testfile file in the nfs directory

# time dd if=/dev/zero of=/Data/webapp/testfile bs=16k count=16384

  16384+0 records in
  16384+0 records out
  268435456 bytes (268 MB) copied, 2.89525 s, 92.7 MB/s
  real 0m2.944s
  user 0m0.015s
  sys 0m0.579s

测试读的性能

# time dd if=/nfsfolder/testfile of=/dev/null bs=16k
  16384+0 records in
  16384+0 records out
  268435456 bytes (268 MB) copied, 0.132925 s, 2.0 GB/s
  real 0m0.138s
  user 0m0.003s
  sys 0m0.127s

Generally speaking, the speed of NFS is quite ideal. If you feel that the speed is slow, add relevant parameters, mount and uninstall repeatedly, and test reading and writing to find a configuration solution that suits you.

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