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Add zgenhostid utility script

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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 #6358
Closes #6379
This commit is contained in:
Olaf Faaland
2017-07-18 18:11:08 -07:00
committed by Brian Behlendorf
parent ffb195c256
commit b9373170e3
14 changed files with 151 additions and 11 deletions
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cmd/zpool/zpool_main.c
+2 -2
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@@ -2177,7 +2177,7 @@ show_import(nvlist_t *config)
break;
case ZPOOL_STATUS_HOSTID_REQUIRED:
(void) printf(gettext(" action: Set a unique system "
"hostid with the genhostid(1) command.\n"));
"hostid with the zgenhostid(8) command.\n"));
break;
default:
(void) printf(gettext(" action: The pool cannot be "
@@ -2304,7 +2304,7 @@ do_import(nvlist_t *config, const char *newname, const char *mntopts,
(void) fprintf(stderr, gettext("Cannot import '%s': "
"pool has the multihost property on and the\n"
"system's hostid is not set. Set a unique hostid "
"with the genhostid(1) command.\n"), name);
"with the zgenhostid(8) command.\n"), name);
} else {
char *hostname = "<unknown>";
uint64_t timestamp = 0;