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 at storage0 /]$ yum install glusterfs-{server,api,libs}-3.5.3 xfsprogs
[root at storage0 /]$ mkfs.xfs -i size=512 /dev/sdb
[root at storage0 /]$ mkdir /brick1
[root at storage0 /]$ mount /dev/sdb /brick1
[root at storage0 /]$ mkdir /brick1/home
[root at 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 at storage0 /]$ chcon system_u:object_r:home_root_t:s0 /brick1/home
[root at 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 at storage0 /]$ service glusterd start
Starting glusterd: [ OK ]
[root at storage0 /]$ gluster volume create home storage0:/brick1/home
volume create: home: success: please start the volume to access data
[root at storage0 /]$ gluster volume start home
volume start: home: success
[root at storage0 /]$ mount -t glusterfs storage0:/home home
[root at 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 at launch ~]$ ssh testuser at storage0
Password:
Could not chdir to home directory /home/testuser: No such file or directory
[testuser at storage0 /]$
[root at storage0 /]$ umount home
[root at storage0 /]$ mount -t glusterfs storage0:/home home -o context="system_u:object_r:user_home_t:s0"
[testuser at launch ~]$ ssh testuser at storage0
Password:
Creating home directory for testuser.
Last login: Tue Jan 6 10:40:29 2015 from 192.168.2.3
[testuser at storage0 ~]$
[root at 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 at 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 at storage1 /]$ yum install glusterfs-{server,api,libs}-3.6.1 xfsprogs
[root at storage1 /]$ mkfs.xfs -i size=512 /dev/sdb
[root at storage1 /]$ mkdir /brick1
[root at storage1 /]$ mount /dev/sdb /brick1
[root at storage1 /]$ mkdir /brick1/home
[root at 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 at storage1 /]$ chcon system_u:object_r:home_root_t:s0 /brick1/home
[root at 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 at storage1 /]$ service glusterd start
Starting glusterd: [ OK ]
[root at storage1 /]$ gluster volume create home storage1:/brick1/home
volume create: home: success: please start the volume to access data
[root at storage1 /]$ gluster volume start home
volume start: home: success
[root at storage1 /]$ mount -t glusterfs storage1:/home home
[root at 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 at launch ~]$ ssh testuser at storage1
Password:
Could not chdir to home directory /home/testuser: No such file or directory
[testuser at storage1 /]$
[root at storage1 /]$ umount home
[root at storage1 /]$ mount -t glusterfs storage1:/home home -o context="system_u:object_r:user_home_t:s0"
Invalid option: context
[root at storage1 /]$ mount -t glusterfs storage1:/home home -o selinux
[root at 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 at 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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