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IndySCC Hw.2

NFS 共享文件系统的搭建与挂载

我们使用的脚本虽然能够在单个节点上运行良好，但是在多节点会报错，具体报错和这个 Issue 非常像

...
           0  restart procs <           64  <=            0  pref procs <           64  <=            0  radario procs <           64
 mo_model_domimp_patches:import_pre_patches: start to import patches
 mo_model_domimp_patches:read_pre_patch: start to init patch_pre
 Read grid file icon_grid_0005_R02B04_G.nc
[scc112-cpu1.novalocal:03960] [32]mca_sharedfp_lockedfile_file_open: Error during file open
[scc112-cpu1.novalocal:03975] [52]mca_sharedfp_lockedfile_file_open: Error during file open
[scc112-cpu1.novalocal:03989] [57]mca_sharedfp_lockedfile_file_open: Error during file open

查看 Issue 下面的回答，获取了一些关键信息：

About the file lock

ompio is able to operate without shared file pointer support if it doesn't find a component that can be used in the current environment and the application doesn't use shared file pointer operations. In this particular scenario, the lockedfile component however said 'I am good to go', because the file system on your local disk does support file locking. The component however doesn't realize that its not the same file system on the different nodes (which leads to the failure that you observe).

因此搭建一个共享文件系统十分必要。

NFS 服务端的搭建

首先确保 nfs 相关依赖和本体已经安装

sudo rpm -qa | grep nfs-utils
sudo rpm -qa | grep rpcbind

若未安装，使用

sudo yum -y install nfs-utils
sudo yum -y install rpcbind

接下来编辑 /etc/exports 文件，记得用 sudo 的管理员权限

配置挂载点

sudo vi /etc/exports

加入例如如下一行

/home/rocky/ICON *(rw,sync,no_subtree_check)

记得不要在 * 和 ( 之间加空格，不然会识别错误

防火墙

我们的机子没有防火墙，略

启动相关服务

sudo systemctl start rpcbind nfs-server
sudo systemctl enable rpcbind nfs-server

检查挂载情况

查看本地挂载是否已经暴露出

showmount -e localhost

如果没有更改成功，使用

sudo exportfs -arv

至此已经实现服务端的暴露

NFS 客户端的挂载

创建挂载目录

以本次需要用的 ICON 为例，新建一个 ~/ICON，cd 进去，什么都没有，ok

查看挂载情况

先查看挂载情况

showmount -e 10.3.59.150

Export list for 10.3.59.150:
/home/rocky/ICON *

确认已经暴露之后开始挂载

编辑挂载文件

sudo vim /etc/fstab

在最后一行中添加

[IP]:[Remoote Absolute Path] [Local Absolute Path] nfs rw,defaults 0 0

例如：

10.3.59.150:/home/rocky/ICON /home/rocky/ICON nfs rw,defaults 0 0

接下来重新挂载

sudo systemctl daemon-reload
sudo mount -a

接下来 cd 到 ICON 目录已经有文件了