zfs/lib/libzfs
Olaf Faaland b9373170e3 Add zgenhostid utility script
Turning the multihost property on requires that a hostid be set to allow
ZFS to determine when a foreign system is attemping to import a pool.
The error message instructing the user to set a hostid refers to
genhostid(1).

Genhostid(1) is not available on SUSE Linux.  This commit adds a script
modeled after genhostid(1) for those users.

Zgenhostid checks for an /etc/hostid file; if it does not exist, it
creates one and stores a value.  If the user has provided a hostid as an
argument, that value is used.  Otherwise, a random hostid is generated
and stored.

This differs from the CENTOS 6/7 versions of genhostid, which overwrite
the /etc/hostid file even though their manpages state otherwise.

A man page for zgenhostid is added. The one for genhostid is in (1), but
I put zgenhostid in (8) because I believe it's more appropriate.

The mmp tests are modified to use zgenhostid to set the hostid instead
of using the spl_hostid module parameter.  zgenhostid will not replace
an existing /etc/hostid file, so new mmp_clear_hostid calls are
required.

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Closes 
Closes 
2017-07-25 13:22:03 -04:00
..
.gitignore Add a pkgconfig file 2014-08-28 07:59:43 -07:00
Makefile.am Add -c to zpool iostat & status to run command 2016-11-29 14:45:38 -07:00
libzfs.pc.in Add a pkgconfig file 2014-08-28 07:59:43 -07:00
libzfs_changelist.c OpenZFS 6931 - lib/libzfs: cleanup gcc warnings 2017-02-07 14:02:27 -08:00
libzfs_config.c OpenZFS 4521 - zfstest is trying to execute evil "zfs unmount -a" 2017-02-03 13:24:44 -08:00
libzfs_core.pc.in Add a pkgconfig file 2014-08-28 07:59:43 -07:00
libzfs_dataset.c OpenZFS 7600 - zfs rollback should pass target snapshot to kernel 2017-07-04 15:29:52 -07:00
libzfs_diff.c OpenZFS 6931 - lib/libzfs: cleanup gcc warnings 2017-02-07 14:02:27 -08:00
libzfs_fru.c OpenZFS 8046 - Let calloc() do the multiplication in libzfs_fru_refresh 2017-04-09 16:07:42 -07:00
libzfs_import.c Multi-modifier protection (MMP) 2017-07-13 13:54:00 -04:00
libzfs_iter.c GCC 7.1 fixes 2017-06-28 10:05:16 -07:00
libzfs_mount.c OpenZFS 8430 - dir_is_empty_readdir() doesn't properly handle error from fdopendir() 2017-06-30 11:11:01 -07:00
libzfs_pool.c Add zgenhostid utility script 2017-07-25 13:22:03 -04:00
libzfs_sendrecv.c GCC 7.1 fixes 2017-06-28 10:05:16 -07:00
libzfs_status.c Multi-modifier protection (MMP) 2017-07-13 13:54:00 -04:00
libzfs_util.c Multi-modifier protection (MMP) 2017-07-13 13:54:00 -04:00