[ClusterLabs] ocf scripts shell and local variables
Dejan Muhamedagic
dejanmm at fastmail.fm
Mon Aug 29 10:43:52 EDT 2016
Hi,
On Mon, Aug 29, 2016 at 08:47:43AM -0500, Ken Gaillot wrote:
> On 08/29/2016 04:17 AM, Gabriele Bulfon wrote:
> > Hi Ken,
> >
> > I have been talking with the illumos guys about the shell problem.
> > They all agreed that ksh (and specially the ksh93 used in illumos) is
> > absolutely Bourne-compatible, and that the "local" variables used in the
> > ocf shells is not a Bourne syntax, but probably a bash specific.
> > This means that pointing the scripts to "#!/bin/sh" is portable as long
> > as the scripts are really Bourne-shell only syntax, as any Unix variant
> > may link whatever Bourne-shell they like.
> > In this case, it should point to "#!/bin/bash" or whatever shell the
> > script was written for.
> > Also, in this case, the starting point is not the ocf-* script, but the
> > original RA (IPaddr, but almost all of them).
> >
> > What about making the code base of RA and ocf-* portable?
> > It may be just by changing them to point to bash, or with some kind of
> > configure modifier to be able to specify the shell to use.
> >
> > Meanwhile, changing the scripts by hands into #!/bin/bash worked like a
> > charm, and I will start patching.
> >
> > Gabriele
>
> Interesting, I thought local was posix, but it's not. It seems everyone
> but solaris implemented it:
>
> http://stackoverflow.com/questions/18597697/posix-compliant-way-to-scope-variables-to-a-function-in-a-shell-script
>
> Please open an issue at:
>
> https://github.com/ClusterLabs/resource-agents/issues
>
> The simplest solution would be to require #!/bin/bash for all RAs that
> use local,
This issue was raised many times, but note that /bin/bash is a
shell not famous for being lean: it's great for interactive use,
but not so great if you need to run a number of scripts. The
complexity in bash, which is superfluous for our use case,
doesn't go well with the basic principles of HA clusters.
> but I'm not sure that's fair to the distros that support
> local in a non-bash default shell. Another possibility would be to
> modify all RAs to avoid local entirely, by using unique variable
> prefixes per function.
I doubt that we could do a moderately complex shell scripts
without capability of limiting the variables' scope and retaining
sanity at the same time.
> Or, it may be possible to guard every instance of
> local with a check for ksh, which would use typeset instead. Raising the
> issue will allow some discussion of the possibilities.
Just to mention that this is the first time someone reported
running a shell which doesn't support local. Perhaps there's an
option that they install a shell which does.
Thanks,
Dejan
> >
> > ----------------------------------------------------------------------------------------
> > *Sonicle S.r.l. *: http://www.sonicle.com <http://www.sonicle.com/>
> > *Music: *http://www.gabrielebulfon.com <http://www.gabrielebulfon.com/>
> > *Quantum Mechanics : *http://www.cdbaby.com/cd/gabrielebulfon
> >
> >
> >
> > ----------------------------------------------------------------------------------
> >
> > Da: Ken Gaillot <kgaillot at redhat.com>
> > A: gbulfon at sonicle.com Cluster Labs - All topics related to open-source
> > clustering welcomed <users at clusterlabs.org>
> > Data: 26 agosto 2016 15.56.02 CEST
> > Oggetto: Re: ocf scripts shell and local variables
> >
> > On 08/26/2016 08:11 AM, Gabriele Bulfon wrote:
> > > I tried adding some debug in ocf-shellfuncs, showing env and ps
> > -ef into
> > > the corosync.log
> > > I suspect it's always using ksh, because in the env output I
> > produced I
> > > find this: KSH_VERSION=.sh.version
> > > This is normally not present in the environment, unless ksh is running
> > > the shell.
> >
> > The RAs typically start with #!/bin/sh, so whatever that points to on
> > your system is what will be used.
> >
> > > I also tried modifiying all ocf shells with "#!/usr/bin/bash" at the
> > > beginning, no way, same output.
> >
> > You'd have to change the RA that includes them.
> >
> > > Any idea how can I change the used shell to support "local" variables?
> >
> > You can either edit the #!/bin/sh line at the top of each RA, or figure
> > out how to point /bin/sh to a Bourne-compatible shell. ksh isn't
> > Bourne-compatible, so I'd expect lots of #!/bin/sh scripts to fail with
> > it as the default shell.
> >
> > > Gabriele
> > >
> > >
> > ----------------------------------------------------------------------------------------
> > > *Sonicle S.r.l. *: http://www.sonicle.com <http://www.sonicle.com/>
> > > *Music: *http://www.gabrielebulfon.com
> > <http://www.gabrielebulfon.com/>
> > > *Quantum Mechanics : *http://www.cdbaby.com/cd/gabrielebulfon
> > >
> > >
> > ------------------------------------------------------------------------
> > >
> > >
> > > *Da:* Gabriele Bulfon <gbulfon at sonicle.com>
> > > *A:* kgaillot at redhat.com Cluster Labs - All topics related to
> > > open-source clustering welcomed <users at clusterlabs.org>
> > > *Data:* 26 agosto 2016 10.12.13 CEST
> > > *Oggetto:* Re: [ClusterLabs] ocf::heartbeat:IPaddr
> > >
> > >
> > > I looked around what you suggested, inside ocf-binaris and
> > > ocf-shellfuncs etc.
> > > So I found also these logs in corosync.log :
> > >
> > > Aug 25 17:50:33 [2250] crmd: notice: process_lrm_event:
> > > xstorage1-xstorage2_wan2_IP_start_0:22 [
> > > /usr/lib/ocf/resource.d/heartbeat/IPaddr[71]: local: not found [No
> > > such file or
> > > directory]\n/usr/lib/ocf/resource.d/heartbeat/IPaddr[354]: local:
> > > not found [No such file or
> > > directory]\n/usr/lib/ocf/resource.d/heartbeat/IPaddr[355]: local:
> > > not found [No such file or
> > > directory]\n/usr/lib/ocf/resource.d/heartbeat/IPaddr[356]: local:
> > > not found [No such file or directory]\nocf-exit-reason:Setup
> > > problem: coul
> > >
> > > Aug 25 17:50:33 [2246] lrmd: notice: operation_finished:
> > > xstorage2_wan2_IP_start_0:3613:stderr [
> > > /usr/lib/ocf/resource.d/heartbeat/IPaddr[71]: local: not found [No
> > > such file or directory] ]
> > >
> > > Looks like the shell is not happy with the "local" variable
> > definition.
> > > I tried running ocf-shellfuncs manually with sh and bash and they
> > > all run without errors.
> > > How can I see what shell is running these scripts?
> > >
> > >
> > ----------------------------------------------------------------------------------------
> > > *Sonicle S.r.l. *: http://www.sonicle.com <http://www.sonicle.com/>
> > > *Music: *http://www.gabrielebulfon.com
> > <http://www.gabrielebulfon.com/>
> > > *Quantum Mechanics : *http://www.cdbaby.com/cd/gabrielebulfon
> > >
> > >
> > >
> > >
> > ----------------------------------------------------------------------------------
> > >
> > > Da: Ken Gaillot <kgaillot at redhat.com>
> > > A: users at clusterlabs.org
> > > Data: 25 agosto 2016 18.07.42 CEST
> > > Oggetto: Re: [ClusterLabs] ocf::heartbeat:IPaddr
> > >
> > > On 08/25/2016 10:51 AM, Gabriele Bulfon wrote:
> > > > Hi,
> > > >
> > > > I'm advancing with this monster cluster on XStreamOS/illumos ;)
> > > >
> > > > In the previous older tests I used heartbeat, and I had these
> > > lines to
> > > > take care of the swapping public IP addresses:
> > > >
> > > > primitive xstorage1_wan1_IP ocf:heartbeat:IPaddr params
> > > ip="1.2.3.4"
> > > > cidr_netmask="255.255.255.0" nic="e1000g1"
> > > > primitive xstorage2_wan2_IP ocf:heartbeat:IPaddr params
> > > ip="1.2.3.5"
> > > > cidr_netmask="255.255.255.0" nic="e1000g1"
> > > >
> > > > location xstorage1_wan1_IP_pref xstorage1_wan1_IP 100: xstorage1
> > > > location xstorage2_wan2_IP_pref xstorage2_wan2_IP 100: xstorage2
> > > >
> > > > They get configured, but then I get this in crm status:
> > > >
> > > > xstorage1_wan1_IP (ocf::heartbeat:IPaddr): Stopped
> > > > xstorage2_wan2_IP (ocf::heartbeat:IPaddr): Stopped
> > > >
> > > > Failed Actions:
> > > > * xstorage1_wan1_IP_start_0 on xstorage1 'not installed' (5):
> > > call=20,
> > > > status=complete, exitreason='Setup problem: couldn't find command:
> > > > /usr/bin/gawk',
> > > > last-rc-change='Thu Aug 25 17:50:32 2016', queued=1ms, exec=158ms
> > > > * xstorage2_wan2_IP_start_0 on xstorage1 'not installed' (5):
> > > call=22,
> > > > status=complete, exitreason='Setup problem: couldn't find command:
> > > > /usr/bin/gawk',
> > > > last-rc-change='Thu Aug 25 17:50:33 2016', queued=1ms, exec=29ms
> > > > * xstorage1_wan1_IP_start_0 on xstorage2 'not installed' (5):
> > > call=22,
> > > > status=complete, exitreason='Setup problem: couldn't find command:
> > > > /usr/bin/gawk',
> > > > last-rc-change='Thu Aug 25 17:50:30 2016', queued=1ms, exec=36ms
> > > > * xstorage2_wan2_IP_start_0 on xstorage2 'not installed' (5):
> > > call=20,
> > > > status=complete, exitreason='Setup problem: couldn't find command:
> > > > /usr/bin/gawk',
> > > > last-rc-change='Thu Aug 25 17:50:29 2016', queued=0ms, exec=150ms
> > > >
> > > >
> > > > The crm configure process already checked of the presence of the
> > > > required IPaddr shell, and it was ok.
> > > > Now looks like it's looking for "/usr/bin/gawk", and that is
> > > actually there!
> > > > Is there any known incompatibility with the mixed heartbeat
> > > ocf ? Should
> > > > I use corosync specific ocf files or something else?
> > >
> > > "heartbeat" in this case is just an OCF provider name, and has
> > > nothing
> > > to do with the heartbeat messaging layer, other than having its
> > > origin
> > > in the same project. There actually has been a recent proposal
> > > to rename
> > > the provider to "clusterlabs" to better reflect the current reality.
> > >
> > > The "couldn't find command" message comes from the ocf-binaries
> > > shell
> > > functions. If you look at have_binary() there, it uses sed and
> > > which,
> > > and I'm guessing that fails on your OS somehow. You may need to
> > > patch it.
> > >
> > > > Thanks again!
> > > >
> > > > Gabriele
> > > >
> > > >
> > >
> > ----------------------------------------------------------------------------------------
> > > > *Sonicle S.r.l. *: http://www.sonicle.com
> > > <http://www.sonicle.com/>
> > > > *Music: *http://www.gabrielebulfon.com
> > > <http://www.gabrielebulfon.com/>
> > > > *Quantum Mechanics : *http://www.cdbaby.com/cd/gabrielebulfon
>
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