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GlusterFS 9 : GlusterFS + SMB
2021/05/25
 
Configure GlusterFS volume to enable SMB protocol.
For example, Configure SMB setting to a Gluster Volume [vol_distributed] like an example of the link here.
[1] Configure GlusterFS to enable SMB setting on a Node in GlusterFS Cluster.
[root@node01 ~]#
yum -y install centos-release-samba411
[root@node01 ~]#
sed -i -e "s/enabled=1/enabled=0/g" /etc/yum.repos.d/CentOS-Samba-411.repo
[root@node01 ~]#
yum --enablerepo=centos-samba411 -y install samba ctdb samba-vfs-glusterfs
# stop the target Gluster volume and change settings

[root@node01 ~]#
gluster volume stop vol_distributed

Stopping volume will make its data inaccessible. Do you want to continue? (y/n)
y

volume stop: vol_distributed: success
[root@node01 ~]#
gluster volume set vol_distributed user.smb enable

volume set: success
[root@node01 ~]#
gluster volume set vol_distributed performance.write-behind off

volume set: success
[root@node01 ~]#
gluster volume set vol_distributed group samba

volume set: success
[root@node01 ~]#
vi /var/lib/glusterd/hooks/1/start/post/S29CTDBsetup.sh
# line 25 : change to the target Gluster volume name

META="
vol_distributed
"
[root@node01 ~]#
vi /var/lib/glusterd/hooks/1/stop/pre/S29CTDB-teardown.sh
# line 13 : change to the target Gluster volume name

META="
vol_distributed
"
# start Gluster volume

[root@node01 ~]#
gluster volume start vol_distributed

volume start: vol_distributed: success
# with the settings above, follwing mounting is done automatically

[root@node01 ~]#
df -h /gluster/lock

Filesystem                             Size  Used Avail Use% Mounted on
node01.srv.world:/vol_distributed.tcp   52G  3.9G   49G   8% /gluster/lock

[root@node01 ~]#
tail -1 /etc/fstab

node01.srv.world:/vol_distributed /gluster/lock glusterfs _netdev,transport=tcp,xlator-option=*client*.ping-timeout=10 0 0

[root@node01 ~]#
vi /etc/ctdb/nodes
# create new

# write all Nodes that configure target Gluster volume

10.0.0.51
10.0.0.52
[root@node01 ~]#
vi /etc/ctdb/public_addresses
# create new

# set virtual IP address for SMB access

# [eth0] means network interface name ⇒ replace to your environment

10.0.0.59/24 eth0
[root@node01 ~]#
systemctl enable --now ctdb
# confirm status

[root@node01 ~]#
ctdb status

Number of nodes:2
pnn:0 10.0.0.51        OK (THIS NODE)
pnn:1 10.0.0.52        DISCONNECTED|UNHEALTHY|INACTIVE
Generation:843141804
Size:1
hash:0 lmaster:0
Recovery mode:NORMAL (0)
Recovery master:0

[root@node01 ~]#
ctdb ip

Public IPs on node 0
10.0.0.59 0
[2] Configure Samba.
For example, Create a shared Folder that users in [smbgroup] group can only access to shared folder [smbshare] and also they are required user authetication.
# mount Gluster volume with GlusterFS Native and create a shared folder for SMB access

[root@node01 ~]#
mount -t glusterfs node01.srv.world:/vol_distributed /mnt

[root@node01 ~]#
mkdir /mnt/smbshare

[root@node01 ~]#
groupadd smbgroup

[root@node01 ~]#
chgrp smbgroup /mnt/smbshare

[root@node01 ~]#
chmod 770 /mnt/smbshare

[root@node01 ~]#
umount /mnt

[root@node01 ~]#
vi /etc/samba/smb.conf
[global]
        workgroup = MYGROUP
        netbios name = MYSERVER
        server string = Samba Server Version %v
        log file = /var/log/samba/log.%m
        max log size = 50
        security = user
        passdb backend = tdbsam
        load printers = yes
        cups options = raw
        # add follows
        clustering = yes
        kernel share modes = no
        kernel oplocks = no
        map archive = no
        map hidden = no
        map read only = no
        map system = no
        store dos attributes = yes

# follwoing 9 lines are configred automatically
[gluster-vol_distributed]
comment = For samba share of volume vol_distributed
vfs objects = glusterfs
glusterfs:volume = vol_distributed
glusterfs:logfile = /var/log/samba/glusterfs-vol_distributed.%M.log
glusterfs:loglevel = 7
path = /
read only = no
kernel share modes = no
# add follows
writable = yes
valid users = @smbgroup
force create mode = 777
force directory mode = 777
inherit permissions = yes

[root@node01 ~]#
systemctl enable --now smb
# add Samba user

[root@node01 ~]#
useradd cent

[root@node01 ~]#
smbpasswd -a cent

New SMB password:    
# set any SMB password

Retype new SMB password:
Added user cent.
[root@node01 ~]#
usermod -G smbgroup cent

[3] If SELinux is enabled, change policy.
[root@node01 ~]#
setsebool -P use_fusefs_home_dirs on

[root@node01 ~]#
setsebool -P samba_load_libgfapi on

[root@node01 ~]#
setsebool -P domain_kernel_load_modules on

[4] If Firewalld is running, allow services.
[root@node01 ~]#
firewall-cmd --add-service={samba,ctdb} --permanent

success
[root@node01 ~]#
firewall-cmd --reload

success
[5] Verify it can access to the target share with SMB from any Linux client computer.
The examples below are on Linux clients but it's possible to access from Windows clients with common way.
# verify with [smbclient]

[root@client ~]#
smbclient //node01.srv.world/gluster-vol_distributed -U cent

Enter MYGROUP\cent's password:
Try "help" to get a list of possible commands.

# verify witable to move to shared folder
smb: \> cd smbshare

smb: \smbshare\> mkdir testdir
smb: \smbshare\> ls
  .                                   D        0  Tue May 25 11:25:11 2021
  ..                                  D        0  Tue May 25 11:19:01 2021
  testdir                             D        0  Tue May 25 11:25:11 2021

                54491144 blocks of size 1024. 50354420 blocks available

smb: \smbshare\> exit

# verify with [mount]

# for [10.0.0.59], it is virtual IP address set in [1] section

[root@client ~]#
mount -t cifs -o vers=3.0,username=cent //10.0.0.59/gluster-vol_distributed /mnt

Password for cent@//10.0.0.59/gluster-vol_distributed: ********
[root@client ~]#
df -hT

Filesystem                          Type      Size  Used Avail Use% Mounted on
devtmpfs                            devtmpfs  1.9G     0  1.9G   0% /dev
tmpfs                               tmpfs     1.9G     0  1.9G   0% /dev/shm
tmpfs                               tmpfs     1.9G  8.6M  1.9G   1% /run
tmpfs                               tmpfs     1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root             xfs        26G  1.7G   25G   7% /
/dev/vda1                           xfs      1014M  319M  696M  32% /boot
tmpfs                               tmpfs     379M     0  379M   0% /run/user/0
//10.0.0.59/gluster-vol_distributed cifs       52G  4.0G   49G   8% /mnt

[root@client ~]#
touch /mnt/smbshare/testfile.txt

[root@client ~]#
ll /mnt/smbshare

total 4
drwxr-xr-x. 2 root root 0 May 24 19:25 testdir
-rwxr-xr-x. 1 root root 0 May 24 19:26 testfile.txt
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