Hi all
I run a small HPC with a single storage node (Scientific Linux 6, using Gluster
3.5.2 RPMs). SELinux is set to Enforcing. Home directories are shared to a
handful of compute nodes where SELinux is also set to Enforcing.
The system is quite happy provided you specify the correct SELinux context when
mounting /home (system_u:object_r:user_home_t:s0). With 3.5 this done with
$ mount -t glusterfs storage:/home /home -o
context="system_u:object_r:user_home_t:s0"
I'm going to be adding a second storage node and will be setting up replication
between the two nodes. While I'm doing that, I might as well upgrade to 3.6+.
During testing I found that version 3.6.1 of mount.glusterfs does not support
the 'context' mount option. Is the removal of this functionality intentional?
There's unfortunately very little documentation available on SELinux support in
Gluster. Version 3.6.1 does have the 'selinux' mount option, but it doesn't
seem to do anything.
It should also be noted that a 3.5.3 client mounting a 3.6.1 server works as
expected, a 3.6.1 client never has the correct SELinux tags. The issue seems to
be limited to the mount.glusterfs utility.
Below I'll paste the output of my testing. 'storage0' runs 3.5.3 and works as
expected, 'storage1' runs 3.6.1 and doesn't honour SELinux tags.
Any help will be appreciated.
ciao
Charl
=== Gluster 3.5.3 START ===
[root@storage0 /]$ yum install glusterfs-{server,api,libs}-3.5.3 xfsprogs
[root@storage0 /]$ mkfs.xfs -i size=512 /dev/sdb
[root@storage0 /]$ mkdir /brick1
[root@storage0 /]$ mount /dev/sdb /brick1
[root@storage0 /]$ mkdir /brick1/home
[root@storage0 /]$ ls -lsaZ /home
total 8
drwxr-xr-x. root root system_u:object_r:home_root_t:s0 .
dr-xr-xr-x. root root system_u:object_r:root_t:s0 ..
[root@storage0 /]$ chcon system_u:object_r:home_root_t:s0 /brick1/home
[root@storage0 /]$ ls -lsaZ /brick1/home
total 0
drwxr-xr-x. root root system_u:object_r:home_root_t:s0 .
drwxr-xr-x. root root system_u:object_r:file_t:s0 ..
[root@storage0 /]$ service glusterd start
Starting glusterd: [ OK ]
[root@storage0 /]$ gluster volume create home storage0:/brick1/home
volume create: home: success: please start the volume to access data
[root@storage0 /]$ gluster volume start home
volume start: home: success
[root@storage0 /]$ mount -t glusterfs storage0:/home home
[root@storage0 /]$ ls -lsaZ /home
total 4
drwxr-xr-x. root root system_u:object_r:fusefs_t:s0 .
dr-xr-xr-x. root root system_u:object_r:root_t:s0 ..
[testuser@launch ~]$ ssh testuser@storage0
Password:
Could not chdir to home directory /home/testuser: No such file or directory
[testuser@storage0 /]$
[root@storage0 /]$ umount home
[root@storage0 /]$ mount -t glusterfs storage0:/home home -o
context="system_u:object_r:user_home_t:s0"
[testuser@launch ~]$ ssh testuser@storage0
Password:
Creating home directory for testuser.
Last login: Tue Jan 6 10:40:29 2015 from 192.168.2.3
[testuser@storage0 ~]$
[root@storage0 /]$ ls -lsaZ /home
total 4
drwxr-xr-x. root root system_u:object_r:user_home_t:s0 .
dr-xr-xr-x. root root system_u:object_r:root_t:s0 ..
drwxr-xr-x. testuser users system_u:object_r:user_home_t:s0 testuser
[root@storage0 /]$ rpm -qa | grep gluster
glusterfs-libs-3.5.3-1.el6.x86_64
glusterfs-api-3.5.3-1.el6.x86_64
glusterfs-cli-3.5.3-1.el6.x86_64
glusterfs-server-3.5.3-1.el6.x86_64
glusterfs-3.5.3-1.el6.x86_64
glusterfs-fuse-3.5.3-1.el6.x86_64
=== Gluster 3.5.3 END ===
=== Gluster 3.6.1 START ===
[root@storage1 /]$ yum install glusterfs-{server,api,libs}-3.6.1 xfsprogs
[root@storage1 /]$ mkfs.xfs -i size=512 /dev/sdb
[root@storage1 /]$ mkdir /brick1
[root@storage1 /]$ mount /dev/sdb /brick1
[root@storage1 /]$ mkdir /brick1/home
[root@storage1 /]$ ls -lsaZ /home
total 8
drwxr-xr-x. root root system_u:object_r:home_root_t:s0 .
dr-xr-xr-x. root root system_u:object_r:root_t:s0 ..
[root@storage1 /]$ chcon system_u:object_r:home_root_t:s0 /brick1/home
[root@storage1 /]$ ls -lsaZ /brick1/home
total 0
drwxr-xr-x. root root system_u:object_r:home_root_t:s0 .
drwxr-xr-x. root root system_u:object_r:file_t:s0 ..
[root@storage1 /]$ service glusterd start
Starting glusterd: [ OK ]
[root@storage1 /]$ gluster volume create home storage1:/brick1/home
volume create: home: success: please start the volume to access data
[root@storage1 /]$ gluster volume start home
volume start: home: success
[root@storage1 /]$ mount -t glusterfs storage1:/home home
[root@storage1 /]$ ls -lsaZ /home
total 4
drwxr-xr-x. root root system_u:object_r:fusefs_t:s0 .
dr-xr-xr-x. root root system_u:object_r:root_t:s0 ..
[testuser@launch ~]$ ssh testuser@storage1
Password:
Could not chdir to home directory /home/testuser: No such file or directory
[testuser@storage1 /]$
[root@storage1 /]$ umount home
[root@storage1 /]$ mount -t glusterfs storage1:/home home -o
context="system_u:object_r:user_home_t:s0"
Invalid option: context
[root@storage1 /]$ mount -t glusterfs storage1:/home home -o selinux
[root@storage1 /]$ ls -lsaZ /home
total 4
drwxr-xr-x. root root system_u:object_r:fusefs_t:s0 .
dr-xr-xr-x. root root system_u:object_r:root_t:s0 ..
[root@storage1 /]$ rpm -qa | grep gluster
glusterfs-libs-3.6.1-1.el6.x86_64
glusterfs-api-3.6.1-1.el6.x86_64
glusterfs-cli-3.6.1-1.el6.x86_64
glusterfs-server-3.6.1-1.el6.x86_64
glusterfs-3.6.1-1.el6.x86_64
glusterfs-fuse-3.6.1-1.el6.x86_64
=== Gluster 3.5.3 END ===
--
Charl Möller | System Administrator: HPC and Linux systems | University of
Stellenbosch | t: +27 21 808 9490
https://blogs.sun.ac.za/it | http://www.sun.ac.za |@ITStellenUni
https://www.google.co.za/maps/place/Information+Technology/@-33.929269,18.865966
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