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The lvm2-activation{-early,-net}.service systemd unit statuses were missing
in dump gathered by lvmdump -s. These are quite important when debugging
scenarios with systemd environment and where lvmetad is not used.
Make sure log/prefix is set to "" when getting the list of VG names.
We need this for the format to be correct so it's properly searched
through later on.
$ vgcreate vgA /dev/sda
Volume group "vgA" successfully created
$ dd if=/dev/sda of=/dev/sdb bs=1M
$ dd if=/dev/sda of=/dev/sdc bs=1M
(the new VG name is prefix of existing VG name)
$ vgimportclone -n vg /dev/sdb
(the new VG name is suffix of existing VG name)
$ vgimportclone -n gA /dev/sdc
Before this patch:
------------------
(we end up with "vg1" and "gA1" names with the "1" suffix which is not needed)
$ vgs -o vg_name
VG
gA1
vg1
vgA
With this patch applied:
------------------------
(we end up with "vg" and "gA" names as they're unique already and no extra suffix is added)
$ # vgs -o vg_name
VG
gA
vg
vgA
Of course, if the name supplied is not unique, the number is added correctly:
$ dd if=/dev/sda of=/dev/sdb bs=1M
$ vgimportclone -n vgA /dev/sdb
$ vgs -o vg_name
VG
vgA
vgA1
We can replace the expressions with awk/grep/cut/tr with --select now and
more suitable reporting options and modes. Also, we don't need to check
the temporary lvm.conf generated within vgimportclone script since we're
generating it ourselves now using lvmconfig, not using sed anymore like
it was before (so we can be pretty sure it's correct - we use lvmconfig
now even for generating the lvm.conf itself).
We want most of our units to be started before any local/remote mount
points are mounted - we used {local,remote}-fs.target for this purpose
before, but it was not 100% correct as there's even {local,remote}-fs-pre.target
special systemd unit reserved for this exact purpose.
See also man 7 systemd.special and "local-fs-pre.target"/"remote-fs-pre.target"
description.
Commit 00b36ef06a had a typo
and missed '{' for shell variable, thus command used slightly
different 'tmp' dir name for cache dir (with extra '}').
Such change was unnoticed until a recent fix in persistent
filter, lvm2 missed to update cache file when --config
was specified.
The result was, /tmp dir was accumulating snap.XXXXX} dirs when
running vgimportclose script.
If running lvmconf ... --startstopservice --mirrorservice in systemd
environment, handle lvm2-cmirrord accordingly. A typo in the script
caused the lvm2-cmirrord to not start/stop immediately, it was
only enabled/disabled (so the --startstopservice was ignored in this
case).
If lvmetad is not used, we generate lvm2-activation{-early,-net}.service
systemd services to activate any VGs found on the system. So far we used
--sysinit during this activation as polling was still forked off of the
lvm activation command.
This has changed with lvmpolld - we have proper lvmpolld systemd
service now (activated via its socket unit). As such, we don't need
to use --sysinit anymore during activation in systemd environment
as polling was the only barrier to remove the need for --sysinit.
'lvm dumpconfig' now does a lot more than just dumping configuration
information and is no longer only a support tool. Users now need
to run it to find out about configuration information that has been
removed from the lvm.conf man page so we need to promote this to full
command line status as 'lvmconfig'. Also accept 'lvm config' and mention
it in the usage information of lvmconf (which should also get merged in
eventually).
This removes dependency on lvm binary - if it's not present, all LVM
processing is skipped (shouldn't normally happen because if lvm binary
is missing then there's obviously nothing that would activate it, but
let's make sure).
Without this tight dependency on lvm, the blkdeactivate script can
be packaged with libdevmapper/dmsetup (in contrast to lvm as it was
before) and as such the script can still be used to handle other DM
devices.
This patch adds new options to lvmconf:
--enable-halvm (just like --enable-cluster, but configure LVM
for use in HA LVM - meaning disabling lvmetad and
making sure we have locking_type=1)
--disable-halvm (just like --disable-cluster, but configure LVM
back from HA LVM - meaning enabling lvmetad if
it's enabled by default and making sure we have
default locking type set)
--services (causes clvmd and lvmetad services to be enabled or
disabled appropriately and conforming to the changes
in lvm configuration we've just made with lvmconf)
--mirrorservice (in addition to clvmd and lvmetad services, also
enable or disable cmirrord service appropriately;
this is a separate option because cmirrord is
optional and it doesn't need to be always enabled
when clvmd is enabled)
--startstopservices (in addition to enabling or disabling services,
start and stop these services immediately)
These options are supposed to help users to make their system ready
for cluster with clvmd (active-active) or HA LVM (active-passive) use
while lvmconf script can handle services as well so users don't need
to bother about setting them manually.
Also, before this patch, we hardcoded global/use_lvmetad=0 as default
value in lvmconf script. Howeverm this default may change by just
flipping the value in config_settings.h and we may forget to edit
the lvmconf. It's better to use lvm dumpconfig --type default global/use_lvmetad
to get the actual default value and use this one instead of hardcoded one.
When lvm2-pvscan@.service and lvm2-lvmetad.service are scheduled to be
stopped lvm2-pvscan@.service should be stopped first since pvscan uses
lvmetad.
This is especially important if lvm2-lvmetad.socket is also scheduled to
be stopped as in this case connection requests are suppressed causing
pvscan to fail.
The iscsi-shutdown.service is the one responsible for logging out
iscsi sessions so blk-availability.service (running the blkdeactivate
script) should be run before that on shutdown (so we need to use
After=iscsi-shutdown.service because "After" relates to starting
the service and the opposite order is automatically applied on
stopping the service at shutdown).
Two new functions added in the init script: rh_status and rh_status_q.
First one to be used in status() and second one to be used in start(),
stop(), force_stop(). Check for 'dmeventd' added and print list of
lvs being monitored in status().
The arg check using pvs is unnecessary. If the arg is not a PV,
the command will just fail later. Using the pvs command at this
point in the command is a problem when lvmetad is running, because
the pvs command does not report duplicate PVs when using lvmetad.
(Alternatively, use_lvmetad could be disabled by adding a --config
override to this pvs command.)
No need to use awk now to get appropriate VGs/LVs, use LVM's
own --select - it's quicker, it removes a need for external
dependency on awk and it's also more readable.
All the LVM commands are run in mode without lvmetad use (since lvmetad
can't handle duplicates). When we're finished with vgimportclone, we
need to notify lvmetad about changes.
Before this patch (/dev/sda and /dev/sdb contains a copy VG called "vg"):
$ vgimportclone --basevgname vg_snap /dev/sdb
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
WARNING: Activation disabled. No device-mapper interaction will be attempted.
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
Physical volume "/tmp/snap.zcJ8LCmj/vgimport0" changed 1 physical volume changed / 0 physical volumes not changed
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
WARNING: Activation disabled. No device-mapper interaction will be attempted.
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
Volume group "vg" successfully changed
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
Volume group "vg" successfully renamed to "vg_snap"
Reading all physical volumes. This may take a while...
Found volume group "vg" using metadata type lvm2
Found volume group "fedora" using metadata type lvm2
$ vgs
VG #PV #LV #SN Attr VSize VFree
fedora 1 2 0 wz--n- 9.50g 0
vg 1 1 0 wz--n- 124.00m 120.00m
(...lvmetad doesn't see the new "vg_snap"!)
With this patch applied:
$ vgimportclone --basevgname vg_snap /dev/sdb
...
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling it!
Volume group "vg" successfully renamed to "vg_snap"
Notifying lvmetad about changes since it was disabled temporarily.
Reading all physical volumes. This may take a while...
Found volume group "vg_snap" using metadata type lvm2
Found volume group "fedora" using metadata type lvm2
Found volume group "vg" using metadata type lvm2
$ vgs
VG #PV #LV #SN Attr VSize VFree
fedora 1 2 0 wz--n- 9.50g 0
vg 1 1 0 wz--n- 124.00m 120.00m
vg_snap 1 1 0 wz--n- 124.00m 120.00m
The "restart lvmetad before enabling it" message is a bit misleading
here - we should probably suppress this one, but we can't suppress
warning messages selectively at the moment and we don't want to lose
other warning/error messages printed...
With current dumpconfig, we can generate lvm.conf easily - we can merge
current lvm.conf with the config given on cmd line:
lvm dumpconfig --mergedconfig --config "..."
This is a bit simpler than using awk and it also avoids problems when some of
the configuration is missing in existing lvm.conf file and hardcoded defaults
are used instead. The dumpconfig handles this transparently.
Bug https://bugzilla.redhat.com/show_bug.cgi?id=843587 is handled better
now - the hang does not occur anymore. There are still error messages
issued though during shutdown if someone stops lvm2-lvmetad.service
manually that lvm2-monitor.service depends on (even during shutdown).
These errors are correct though and will point to incorrect
configuration (still having use_lvmetad=1 in lvm.conf and stopping
lvm2-lvmetad.service manually).
The workaround to prevent the hang is not needed now. So the
'--config "global{use_lvmetad=0}"' is now removed from the
lvm2-monitor.service's ExecStop line.
The sysinit.target is ordered even before sockets.target and there
may be situations in which the lvmetad is needed early, for example
in rescue.target to activate some LVs on which mountpoints reside.
Also, like in the case of rescue.target, the sockets.target is not
pulled in (unless some other service pulls it in explicitly).
See also: https://bugzilla.redhat.com/show_bug.cgi?id=1087586#c26
for the summary of the problem.
This is sort of info we always ask people to retrieve when
inspecting problems in systemd environment so let's have this
as part of lvmdump directly.
The -s option does not need to be bound to systemd only. We could
add support for initscripts or any other system-wide/service tracking
info that can help us with debugging problems.
For a quick overview of config when debugging and to quickly check
which values are different from defaults and which are not defined
in the config and for which defaults are used.
