CL236 client configuration – mount via nfs

This chapter describes how to use clients for NFS mounting and GlusterFS storage.

RHCA column address: https://blog.csdn.net/qq_41765918/category_11532281.html

Red Hat Gluster storage volumes and NFSv3

By default, any new Red Hat Gluster storage volumes will be exported via NFSv3 with acl enabled. This allows clients that cannot run native clients to access data stored on Red Hat Gluster storage volumes without adding a dedicated server to re export these volumes.

The NFSv3 export does not use the NFSv3 server in the Linux kernel. Instead, they use a dedicated NFSv3 server written specifically for Red Hat Gluster storage, which is exported only through TCP.

Unlike native clients, clients using NFSv3 do not automatically fail over to another server when the server connected to them is unavailable. This failover and NFSv4 support can be configured using NFS Ganesha, as discussed in Chapter 8, "configuring IP failover".

The initial configuration uses the server exported by NFSv3

Unless NFSv3 is disabled for a volume, when the volume starts, it has been exported through NFSv3 (from all hosts). To access this volume from a client, the firewall used as an NFSv3 server on the host must be modified to allow this traffic.

When using firewalld, two services must be allowed to enable NFSv3 through the firewall: RPC bind and nfs. RPC bind service allows connection to 111/TCP and 111/UDP ports required by portmapper service, while nfs service allows connection to 2049/TCP port of actual NFSv3 service.

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

# firewall-cmd --reload

Client configuration

# echo "node1:/vol1 /mnt/vol1 nfs defaults,vers=3,_netdev 0 0" >> /etc/fstab 
# mount -a
# The experiment in the textbook is direct nfs rw 0 0, but as suggested, the version parameter is added.

**Note: * * Red Hat Enterprise Linux 7 clients can mount red hat Gloster storage volumes using NFSv3 without any additional mount options, but it is still recommended to add the vers=3 option to the mount, so it is not necessary to try protocol version 4 first. You can also specify the proto TCP option if the client may first attempt to mount via UDP.

Although Red Hat Gluster storage volumes can also be exported via UDP (using the nfs.mount UDP option), UDP exports will not support subdirectory installations or client restrictions set on the volume.

Textbook practice

[student@workstation ~]$ lab nfs-client setup 
Setting up  for lab exercise work:

 • Testing if all hosts are reachable..........................  SUCCESS
 • Adding glusterfs to runtime firewall on servera.............  SUCCESS
 • Adding glusterfs to permanent firewall on servera...........  SUCCESS
 • Adding glusterfs to runtime firewall on serverb.............  SUCCESS
 • Adding glusterfs to permanent firewall on serverb...........  SUCCESS
 • Adding glusterfs to runtime firewall on serverc.............  SUCCESS
 • Adding glusterfs to permanent firewall on serverc...........  SUCCESS
 • Adding glusterfs to runtime firewall on serverd.............  SUCCESS
 • Adding glusterfs to permanent firewall on serverd...........  SUCCESS
 • Adding servera to trusted storage pool......................  SUCCESS
 • Adding serverb to trusted storage pool......................  SUCCESS
 • Adding serverc to trusted storage pool......................  SUCCESS
 • Adding serverd to trusted storage pool......................  SUCCESS
 • Ensuring thin LVM pool vg_bricks/thinpool exists on servera.  SUCCESS
............

1. Set firewall rules

[root@servera ~]# firewall-cmd --add-service=rpc-bind --add-service=nfs --permanent 
success
[root@servera ~]# firewall-cmd --reload 
success

2. Mount using nfs.

[root@workstation ~]# mkdir /mnt/mediadata
[root@workstation ~]# echo "servera:/mediadata /mnt/mediadata nfs rw 0 0" >> /etc/fstab 
[root@workstation ~]# mount -a
[root@workstation ~]# df -Th
Filesystem         Type      Size  Used Avail Use% Mounted on
/dev/vda1          xfs        10G  3.0G  7.1G  30% /
devtmpfs           devtmpfs  902M     0  902M   0% /dev
tmpfs              tmpfs     920M   84K  920M   1% /dev/shm
tmpfs              tmpfs     920M   17M  904M   2% /run
tmpfs              tmpfs     920M     0  920M   0% /sys/fs/cgroup
tmpfs              tmpfs     184M   16K  184M   1% /run/user/42
tmpfs              tmpfs     184M     0  184M   0% /run/user/0
servera:/mediadata nfs       8.0G  130M  7.9G   2% /mnt/mediadata

3. Scoring script

[root@workstation ~]# lab nfs-client grade

summary

• Configure the server exported by NFSv3, such as firewall policy.

• The client configuration uses nfs to mount GlusterFS for use.

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