Re: [zones-discuss] Parallel mount question
After removing NFS, we got yet another corruption - I just heard they use Samba on this file system. So, let me ask the question - Samba is supported in zone, running on LOFS - is this correct? Thanks! Vladi This e-mail and its attachments are confidential and solely for the intended addressee(s). Do not share or use them without Fannie Mae's approval. If received in error, contact the sender and delete them. -Original Message- From: william.ro...@sun.com [mailto:william.ro...@sun.com] Sent: Monday, June 29, 2009 2:00 PM To: Yanakiev, Vladimir Cc: zones-discuss@opensolaris.org Subject: Re: [zones-discuss] Parallel mount question Hello Vladi, Yes you can use LOFS to all your zones to share the file system providing r/w access. I would even say that this is your BEST option. NFS mount in your local zones of a file system shared by the global zone is absolutely not supported (including autofs access of course). HTH, William. On 06/29/09 18:25, Yanakiev, Vladimir wrote: Need a help with a problem. We have VxFS file system, created in a global zone, and mounted under non-global zone as LOFS. Later, two new zones were created on the same server, that needed access to the very same file system. Someone decided to NFS-shareout this file system from the global zone, and NFS mount it on these two new zones. This (to my understanding) after few weeks corrupted bravely the file system, and today we experienced the same for second time. My question is - can I keep the file system in the global zone, loop back it (with LOFS) to all three zones, providing r/w access to all of them, without risk to corrupt it again? Thanks in advance for the help! Vladi ___ zones-discuss mailing list zones-discuss@opensolaris.org ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Le 2 juil. 09 à 15:46, Yanakiev, Vladimir a écrit : After removing NFS, we got yet another corruption - I just heard they use Samba on this file system. So, let me ask the question - Samba is supported in zone, running on LOFS - is this correct? Samba is user-land. AFAIK any userland tasks is supported... Nico ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
What about /dev/smb? Will it be created in the zone during install, or we have to use mknod for it? To my memories, /dev/ is read only in the zone. Also, what will happen, if /dev/smb is simply not there? This e-mail and its attachments are confidential and solely for the intended addressee(s). Do not share or use them without Fannie Mae's approval. If received in error, contact the sender and delete them. -Original Message- From: zones-discuss-boun...@opensolaris.org [mailto:zones-discuss-boun...@opensolaris.org] On Behalf Of Nicolas Dorfsman Sent: Thursday, July 02, 2009 9:50 AM To: Zones discuss Subject: Re: [zones-discuss] Parallel mount question Le 2 juil. 09 à 15:46, Yanakiev, Vladimir a écrit : After removing NFS, we got yet another corruption - I just heard they use Samba on this file system. So, let me ask the question - Samba is supported in zone, running on LOFS - is this correct? Samba is user-land. AFAIK any userland tasks is supported... Nico ___ zones-discuss mailing list zones-discuss@opensolaris.org ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Le 2 juil. 09 à 16:47, Yanakiev, Vladimir a écrit : What about /dev/smb? Will it be created in the zone during install, or we have to use mknod for it? To my memories, /dev/ is read only in the zone. Also, what will happen, if /dev/smb is simply not there? Hu ? What's that ? Did you see this on a Linux Kernel or on a Solaris ? Nico ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
$ uname -a SunOS acust01 5.10 Generic_13-02 sun4u sparc SUNW,Netra-T12 $ ls -ld /dev/smb drwxr-xr-x 2 root other 6656 Sep 25 2007 /dev/smb $ ps -ef |grep smb root 2863 1 0 Jun 28 ? 0:00 ./smbd -D -d 1 -l /export/apps/samba/var -s /export/apps/samba/lib/smb.conf root 2865 1 0 Jun 28 ? 0:08 ./nmbd -D -d 1 -l /export/apps/samba/var -s /export/apps/samba/lib/smb.conf root 2867 2863 0 Jun 28 ? 0:00 ./smbd -D -d 1 -l /export/apps/samba/var -s /export/apps/samba/lib/smb.conf s5uvry 20280 20249 0 11:11:36 pts/7 0:00 grep smb This e-mail and its attachments are confidential and solely for the intended addressee(s). Do not share or use them without Fannie Mae's approval. If received in error, contact the sender and delete them. -Original Message- From: zones-discuss-boun...@opensolaris.org [mailto:zones-discuss-boun...@opensolaris.org] On Behalf Of Nicolas Dorfsman Sent: Thursday, July 02, 2009 10:58 AM To: Zones discuss Subject: Re: [zones-discuss] Parallel mount question Le 2 juil. 09 à 16:47, Yanakiev, Vladimir a écrit : What about /dev/smb? Will it be created in the zone during install, or we have to use mknod for it? To my memories, /dev/ is read only in the zone. Also, what will happen, if /dev/smb is simply not there? Hu ? What's that ? Did you see this on a Linux Kernel or on a Solaris ? Nico ___ zones-discuss mailing list zones-discuss@opensolaris.org ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
William Roche wrote: Now about the automounter, I share Nico's point of view, but as far as I know nothing like that already exist, and No, the automounter or a mount request isn't 'clever' enough (or customized enough) yet to handle NFS data shared by the global zone and translate the mount request into an LOFS mount. So be careful with NFS share from the global zone when you have local zones on the same machine. The global zone could be the one running automount. Since it knows what host is local, it'll convert the nfs mounts to lofs automagically. For each zone, add the zone's automount entries to global:/etc/auto_master as /zonepath/root/home +auto_home vers=3,nosuid (for example) Haven't tried it. It would muck up NFSv4 identities, and blur the lines between the global zone administrator and a local zone admin. --Joe ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Glenn Faden wrote: Well, it doesn't have to be possible. Instead it should be possible to have the mount(2) syscall detect the loopback NFS and convert it into a lofs mount if, say, a flag is set in the arguments, or even by default. I've thought about doing this in the past, but wasn't sure that it would work. The automounter is has some special processing for NFS, and I don't know what would happen if a requested NFS mount got turned into sa LOFS mount. For example, the automounter attempts to unmount anything it mounted that is no longer busy. So, it might also be necessary to modify the umount syscall to translate NFS umounts to LOFS umounts. The automounter periodically attempts to unmount anything mounted atop an autofs trigger node; I don't think anything needs to think about what type of filesystem it is. If autofs were to choke on this, I would expect it to be simple enough to fix it to address the subtlety. Rob T ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Moore, Joe wrote: William Roche wrote: Now about the automounter, I share Nico's point of view, but as far as I know nothing like that already exist, and No, the automounter or a mount request isn't 'clever' enough (or customized enough) yet to handle NFS data shared by the global zone and translate the mount request into an LOFS mount. So be careful with NFS share from the global zone when you have local zones on the same machine. The global zone could be the one running automount. Since it knows what host is local, it'll convert the nfs mounts to lofs automagically. Yes, that part works. For each zone, add the zone's automount entries to global:/etc/auto_master as /zonepath/root/home +auto_home vers=3,nosuid (for example) Haven't tried it. It would muck up NFSv4 identities, and blur the lines between the global zone administrator and a local zone admin. I've tried this over the years. It doesn't work for several reasons. In particular, there is a check in the kernel autofs code to prevent it. But even if that was changed there would need to be some synchronization to inform the global zone automounter about the state of the zones so that the autofs trigger mounts could be managed properly. --Glenn ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
On Tue, Jun 30, 2009 at 10:13:34AM -0400, Moore, Joe wrote: The global zone could be the one running automount. Since it knows what host is local, it'll convert the nfs mounts to lofs automagically. For each zone, add the zone's automount entries to global:/etc/auto_master as /zonepath/root/home +auto_home vers=3,nosuid (for example) Haven't tried it. It would muck up NFSv4 identities, and blur the lines between the global zone administrator and a local zone admin. The problem with this is that it takes something important (sysadmin independence) away from zones to fix a relatively minor problem and greatly complicates the automounter and g-z administration in the process. For example, the automounter would now have multiple distinct -hosts mounts to implement, and we'd have to augment the mount(2) syscall so that the zone ID into which the mount should be made can be passed by the automounter in the g-z (so that we don't muck up NFSv4 identities), and so on. Ideally we should fix the NFS loopback mount VM issues. Anything else is a band-aid, though perhaps a welcome one. If we're gonna put a band-aid on it should be a simple one. Not that the other alternative being discussed is necessarily simple either -- the hardest problem there would be detecting that an NFS mount is from the same running kernel, but then, this is also a problem in your proposal. Nico -- ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
On Tue, 2009-06-30 at 10:13 -0400, Moore, Joe wrote: William Roche wrote: Now about the automounter, I share Nico's point of view, but as far as I know nothing like that already exist, and No, the automounter or a mount request isn't 'clever' enough (or customized enough) yet to handle NFS data shared by the global zone and translate the mount request into an LOFS mount. So be careful with NFS share from the global zone when you have local zones on the same machine. The global zone could be the one running automount. Since it knows what host is local, it'll convert the nfs mounts to lofs automagically. For each zone, add the zone's automount entries to global:/etc/auto_master as /zonepath/root/home +auto_home vers=3,nosuid (for example) Haven't tried it. It would muck up NFSv4 identities, and blur the lines between the global zone administrator and a local zone admin. Yes it will. But isn't it a *separate mode* worth having? If I, as a global zone admin, decide to make all of NFS traffic go through the global zone, shouldn't I be allowed to? In fact, don't we sort of have it already with nfs_global_client_only tweak? What is the reason for not making it one of the official ways to configure how zones interact with NFS? Once again, this is not to say, that a total separation of NFS identities is not needed. Thanks, Roman. ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
On Tue, 2009-06-30 at 10:55 -0500, Nicolas Williams wrote: On Tue, Jun 30, 2009 at 10:13:34AM -0400, Moore, Joe wrote: The global zone could be the one running automount. Since it knows what host is local, it'll convert the nfs mounts to lofs automagically. For each zone, add the zone's automount entries to global:/etc/auto_master as /zonepath/root/home +auto_home vers=3,nosuid (for example) Haven't tried it. It would muck up NFSv4 identities, and blur the lines between the global zone administrator and a local zone admin. The problem with this is that it takes something important (sysadmin independence) away from zones to fix a relatively minor problem and greatly complicates the automounter and g-z administration in the process. For example, the automounter would now have multiple distinct -hosts mounts to implement, and we'd have to augment the mount(2) syscall so that the zone ID into which the mount should be made can be passed by the automounter in the g-z (so that we don't muck up NFSv4 identities), and so on. I'm sorry if I miss the subtleties of the context (or implementation for that matter), but isn't the problem here the fact that mount tables are not really per-zone? They are not really virtualized they are just filtered. Thanks, Roman. ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Le 30 juin 09 à 16:13, Moore, Joe a écrit : William Roche wrote: Now about the automounter, I share Nico's point of view, but as far as I know nothing like that already exist, and No, the automounter or a mount request isn't 'clever' enough (or customized enough) yet to handle NFS data shared by the global zone and translate the mount request into an LOFS mount. So be careful with NFS share from the global zone when you have local zones on the same machine. The global zone could be the one running automount. Since it knows what host is local, it'll convert the nfs mounts to lofs automagically. For each zone, add the zone's automount entries to global:/etc/ auto_master as /zonepath/root/home +auto_home vers=3,nosuid (for example) Excellent ! This should be added to the FAQ ! As already said by others, it's not perfect, as it should be set up in the global zone, but it's really better, better, better, better than the current answer. My personal question now is : why didn't I find it by myself ! :-) Nico ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Nicolas Dorfsman wrote: Le 30 juin 09 à 16:13, Moore, Joe a écrit : William Roche wrote: Now about the automounter, I share Nico's point of view, but as far as I know nothing like that already exist, and No, the automounter or a mount request isn't 'clever' enough (or customized enough) yet to handle NFS data shared by the global zone and translate the mount request into an LOFS mount. So be careful with NFS share from the global zone when you have local zones on the same machine. The global zone could be the one running automount. Since it knows what host is local, it'll convert the nfs mounts to lofs automagically. For each zone, add the zone's automount entries to global:/etc/auto_master as /zonepath/root/home +auto_home vers=3,nosuid (for example) Excellent ! Sorry... This should be added to the FAQ ! As already said by others, it's not perfect, as it should be set up in the global zone, but it's really better, better, better, better than the current answer. Doesn't work. My personal question now is : why didn't I find it by myself ! :-) Because it doesn't work. See: http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/autofs/auto_vnops.c#auto_trigger_mount 1403 /* 1404 * Cross-zone mount triggering is disallowed. 1405 */ 1406 if (fnip-fi_zoneid != getzoneid()) 1407 return (EPERM);/* Not owner of mount */ --Glenn ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
On Tue, 2009-06-30 at 12:58 -0700, Glenn Faden wrote: This should be added to the FAQ ! As already said by others, it's not perfect, as it should be set up in the global zone, but it's really better, better, better, better than the current answer. Doesn't work. That's what I thought too. The question though is -- why not *let* it work under explicit permission? Again, I understand the use case why it shouldn't work. But why there's no acknoledgement of a usability of a case where it makes sense. Doesn't a glance at this thread provide enough of a conviction that asking a global zone to route *all* FS related traffic is a useful thing to do? My personal question now is : why didn't I find it by myself ! :-) Because it doesn't work. See: http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/autofs/auto_vnops.c#auto_trigger_mount 1403 /* 1404 * Cross-zone mount triggering is disallowed. 1405 */ 1406 if (fnip-fi_zoneid != getzoneid()) 1407 return (EPERM);/* Not owner of mount */ This place is easy to fix if you ask me. The real question is what kind of long lasting impact would allowing such a thing have. And this is a conversation I'm very interested in having. Thanks, Roman. ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Le 30 juin 09 à 21:58, Glenn Faden a écrit : Excellent ! Sorry... Makes me angry. This should be added to the FAQ ! As already said by others, it's not perfect, as it should be set up in the global zone, but it's really better, better, better, better than the current answer. Doesn't work. My personal question now is : why didn't I find it by myself ! :-) Because it doesn't work. Thanks. :-| See: http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/autofs/auto_vnops.c#auto_trigger_mount 1403 /* 1404 * Cross-zone mount triggering is disallowed. 1405 */ 1406 if (fnip-fi_zoneid != getzoneid()) 1407 return (EPERM);/* Not owner of mount */ It's a buggy line. We should have something like : if (getzoneid != 0 fnip-fi_zoneid != getzoneid()) Nico ___ zones-discuss mailing list zones-discuss@opensolaris.org
[zones-discuss] Parallel mount question
Need a help with a problem. We have VxFS file system, created in a global zone, and mounted under non-global zone as LOFS. Later, two new zones were created on the same server, that needed access to the very same file system. Someone decided to NFS-shareout this file system from the global zone, and NFS mount it on these two new zones. This (to my understanding) after few weeks corrupted bravely the file system, and today we experienced the same for second time. My question is - can I keep the file system in the global zone, loop back it (with LOFS) to all three zones, providing r/w access to all of them, without risk to corrupt it again? Thanks in advance for the help! Vladi ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Hello Vladi, Yes you can use LOFS to all your zones to share the file system providing r/w access. I would even say that this is your BEST option. NFS mount in your local zones of a file system shared by the global zone is absolutely not supported (including autofs access of course). HTH, William. On 06/29/09 18:25, Yanakiev, Vladimir wrote: Need a help with a problem. We have VxFS file system, created in a global zone, and mounted under non-global zone as LOFS. Later, two new zones were created on the same server, that needed access to the very same file system. Someone decided to NFS-shareout this file system from the global zone, and NFS mount it on these two new zones. This (to my understanding) after few weeks corrupted bravely the file system, and today we experienced the same for second time. My question is - can I keep the file system in the global zone, loop back it (with LOFS) to all three zones, providing r/w access to all of them, without risk to corrupt it again? Thanks in advance for the help! Vladi ___ zones-discuss mailing list zones-discuss@opensolaris.org ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
On Mon, Jun 29, 2009 at 08:00:28PM +0200, William Roche wrote: Hello Vladi, Yes you can use LOFS to all your zones to share the file system providing r/w access. I would even say that this is your BEST option. NFS mount in your local zones of a file system shared by the global zone is absolutely not supported (including autofs access of course). I think each zone's automounter is smart enough to use lofs instead of nfs for mounts from a non-global to a global zone. -Steve L. HTH, William. On 06/29/09 18:25, Yanakiev, Vladimir wrote: Need a help with a problem. We have VxFS file system, created in a global zone, and mounted under non-global zone as LOFS. Later, two new zones were created on the same server, that needed access to the very same file system. Someone decided to NFS-shareout this file system from the global zone, and NFS mount it on these two new zones. This (to my understanding) after few weeks corrupted bravely the file system, and today we experienced the same for second time. My question is - can I keep the file system in the global zone, loop back it (with LOFS) to all three zones, providing r/w access to all of them, without risk to corrupt it again? Thanks in advance for the help! Vladi ___ zones-discuss mailing list zones-discuss@opensolaris.org ___ zones-discuss mailing list zones-discuss@opensolaris.org ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Steve Lawrence wrote: I think each zone's automounter is smart enough to use lofs instead of nfs for mounts from a non-global to a global zone. Please explain how this is possible. How can the automounter convert an nfs specification of a global zone pathname into a pathname which can be expressed using the non-global zone's lofs semantics? --Glenn ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
On Mon, Jun 29, 2009 at 11:31:20AM -0700, Glenn Faden wrote: Steve Lawrence wrote: I think each zone's automounter is smart enough to use lofs instead of nfs for mounts from a non-global to a global zone. Please explain how this is possible. How can the automounter convert an nfs specification of a global zone pathname into a pathname which can be expressed using the non-global zone's lofs semantics? Well, it doesn't have to be possible. Instead it should be possible to have the mount(2) syscall detect the loopback NFS and convert it into a lofs mount if, say, a flag is set in the arguments, or even by default. That would work transparently for the automounter. Though it the automounter were not calling mount(2) directly, but instead passing back mount info to the autofs kernel module caller (which it does for some fs types), then the autofs module would need to know how to convert the mount to a lofs mount. Nico -- ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Vladi, You can mount the filesystem tree that you want to share anywhere in your local zone(s). You can do it in the zone configuration (using zonecfg) but you'll need to reboot the zone to take it into account; or using a mount command from the global zone to have the data appear in a running zone. Practically: For the zonecfg case, as in the zonecfg(1M) man page: zonecfg:myzone3 add fs zonecfg:myzone3:fs set dir=/appl/fs zonecfg:myzone3:fs set special=/export/appl/fs zonecfg:myzone3:fs set type=lofs zonecfg:myzone3:fs add options [rw,nodevices] zonecfg:myzone3:fs end The result is: when you are logged in the local zone you'll see an /appl/fs directory showing the content of the /export/appl/fs directory from the global zone. You'll be allowed to write to this directory as you want. And you can share this same directory the same way in any other local zone in parallel. I guess this is what you are asking for. -=-=-=- Now about the automounter, I share Nico's point of view, but as far as I know nothing like that already exist, and No, the automounter or a mount request isn't 'clever' enough (or customized enough) yet to handle NFS data shared by the global zone and translate the mount request into an LOFS mount. So be careful with NFS share from the global zone when you have local zones on the same machine. HTH, Cheers, William. On 06/29/09 20:51, Yanakiev, Vladimir wrote: Thanks, William! Let me ask one more question - inside the non-global zones, their automounters will still loopback this same file system one more time - if in the non global zone we see /export/appl/fs, it will be looped back as /appl/fs. My understanding is, this should be fine - am I right? Vladi This e-mail and its attachments are confidential and solely for the intended addressee(s). Do not share or use them without Fannie Mae's approval. If received in error, contact the sender and delete them. -Original Message- From: william.ro...@sun.com [mailto:william.ro...@sun.com] Sent: Monday, June 29, 2009 2:00 PM To: Yanakiev, Vladimir Cc: zones-discuss@opensolaris.org Subject: Re: [zones-discuss] Parallel mount question Hello Vladi, Yes you can use LOFS to all your zones to share the file system providing r/w access. I would even say that this is your BEST option. NFS mount in your local zones of a file system shared by the global zone is absolutely not supported (including autofs access of course). HTH, William. On 06/29/09 18:25, Yanakiev, Vladimir wrote: Need a help with a problem. We have VxFS file system, created in a global zone, and mounted under non-global zone as LOFS. Later, two new zones were created on the same server, that needed access to the very same file system. Someone decided to NFS-shareout this file system from the global zone, and NFS mount it on these two new zones. This (to my understanding) after few weeks corrupted bravely the file system, and today we experienced the same for second time. My question is - can I keep the file system in the global zone, loop back it (with LOFS) to all three zones, providing r/w access to all of them, without risk to corrupt it again? Thanks in advance for the help! Vladi ___ zones-discuss mailing list zones-discuss@opensolaris.org ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
On Jun 29, 2009, at 2:31 PM, Glenn Faden glenn.fa...@sun.com wrote: Steve Lawrence wrote: I think each zone's automounter is smart enough to use lofs instead of nfs for mounts from a non-global to a global zone. Please explain how this is possible. How can the automounter convert an nfs specification of a global zone pathname into a pathname which can be expressed using the non-global zone's lofs semantics? It'd have to be a helper out in the global zone that sets up the correct lofs mount. ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
Nicolas Williams wrote: On Mon, Jun 29, 2009 at 11:31:20AM -0700, Glenn Faden wrote: Steve Lawrence wrote: I think each zone's automounter is smart enough to use lofs instead of nfs for mounts from a non-global to a global zone. Please explain how this is possible. How can the automounter convert an nfs specification of a global zone pathname into a pathname which can be expressed using the non-global zone's lofs semantics? Well, it doesn't have to be possible. Instead it should be possible to have the mount(2) syscall detect the loopback NFS and convert it into a lofs mount if, say, a flag is set in the arguments, or even by default. I've thought about doing this in the past, but wasn't sure that it would work. The automounter is has some special processing for NFS, and I don't know what would happen if a requested NFS mount got turned into sa LOFS mount. For example, the automounter attempts to unmount anything it mounted that is no longer busy. So, it might also be necessary to modify the umount syscall to translate NFS umounts to LOFS umounts. Then there is the issue of the automounter looking up entries in /etc/mnttab. It might get confused when looking for NFS entries that were turned into LOFS. That would work transparently for the automounter. Though it the automounter were not calling mount(2) directly, but instead passing back mount info to the autofs kernel module caller (which it does for some fs types), then the autofs module would need to know how to convert the mount to a lofs mount. Note that cross-zone LOFS mounts have a fictitious value for special when viewed in the zone's /etc/mnttab. Instead of the actaul global zone pathname, the special is represented as a duplicate of the zone-relative mountpoint. So it's not obvious how the automounter can do a useful conversion. For this to work, the kernel would have to internally do a LOFS mount but somehow make it appear externally that it is an NFS mount. --Glenn ___ zones-discuss mailing list zones-discuss@opensolaris.org
Re: [zones-discuss] Parallel mount question
James Carlson wrote: On Jun 29, 2009, at 2:31 PM, Glenn Faden glenn.fa...@sun.com wrote: Steve Lawrence wrote: I think each zone's automounter is smart enough to use lofs instead of nfs for mounts from a non-global to a global zone. Please explain how this is possible. How can the automounter convert an nfs specification of a global zone pathname into a pathname which can be expressed using the non-global zone's lofs semantics? It'd have to be a helper out in the global zone that sets up the correct lofs mount. Jim, You may remember that during the early days of the Trusted Extensions project I tried to get the global zone automounter to act as such a helper process. This was before the automounter used doors, and I couldn't get the TLI code to work across zones reliably. There were synchronization issues since the global zone automounter wasn't aware of individual zone states. Maybe a better helper program might be the zoneadmd process that is associated with each zone. --Glenn ___ zones-discuss mailing list zones-discuss@opensolaris.org
