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autofs and NFS failover - can autofs remount?

Why are make jobs failing to find dependancies on automounted filesystems?Autofs mount nfs issuesDoes an NFS export with sec=krb5 *require* that the parent directory also be exported with sec=krb5?What are the most common reasons for NFS auto mounts to fail?Autofs redundant failover to local mountpointAutoFS wildcard subdirectorynfs autofs automount of exported filesystems is empty on nfs serverNFS with autofs: mounting /run/lock gives permissions error“Too many levels of symbolic links” in NFS via automount resolved by restarting DockerMonitoring NFS mounts for existence

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1

1

I have this scenario:

• 2 NFS servers with /usr/share/man as exports (just as example, it can be anything), let say server A and server B (not replicas, just 2 independent servers on the same subnet sharing the same things)




• both NFS servers are up and healthy




• user is initiating mount from client by executing ls /mnt/usr/man (as example); timeout in auto.master is 2 minutes, fstype=nfs, options=ro,soft




• automount is successful, server A was chosen by autofs, and user can see listed man pages




• after 1m 10sec server (NFS) A goes down




• at 1m 20 sec user executes ls /mnt/usr/man again

What is happening is that it is locked - mount stays on server A and no user can go into /mnt/usr/man (nor lsof is working)

After waiting some minutes (ca 10 minutes)

ls: cannot open directory /mnt/usr/man: Input/output error

My question is: should autofs manage this scenario and automatically remount to server B? (even if mount timeout has not finished yet?)

I have read many articles and it looks like my scenario is not "autofs"'es duty (If I want something like this it should be done another way).

But I want to be sure 100% whether autofs should handle this situation itself or not.

automount autofs

share|improve this question

edited Dec 15 '14 at 18:27

HopelessN00b

48.7k25117194

asked Jan 13 '14 at 11:45

yusa.viktoryusa.viktor

63

add a comment | 

1

1

I have this scenario:

• 2 NFS servers with /usr/share/man as exports (just as example, it can be anything), let say server A and server B (not replicas, just 2 independent servers on the same subnet sharing the same things)




• both NFS servers are up and healthy




• user is initiating mount from client by executing ls /mnt/usr/man (as example); timeout in auto.master is 2 minutes, fstype=nfs, options=ro,soft




• automount is successful, server A was chosen by autofs, and user can see listed man pages




• after 1m 10sec server (NFS) A goes down




• at 1m 20 sec user executes ls /mnt/usr/man again

What is happening is that it is locked - mount stays on server A and no user can go into /mnt/usr/man (nor lsof is working)

After waiting some minutes (ca 10 minutes)

ls: cannot open directory /mnt/usr/man: Input/output error

My question is: should autofs manage this scenario and automatically remount to server B? (even if mount timeout has not finished yet?)

I have read many articles and it looks like my scenario is not "autofs"'es duty (If I want something like this it should be done another way).

But I want to be sure 100% whether autofs should handle this situation itself or not.

automount autofs

share|improve this question

edited Dec 15 '14 at 18:27

HopelessN00b

48.7k25117194

asked Jan 13 '14 at 11:45

yusa.viktoryusa.viktor

63

add a comment | 

I have this scenario:

• 2 NFS servers with /usr/share/man as exports (just as example, it can be anything), let say server A and server B (not replicas, just 2 independent servers on the same subnet sharing the same things)




• both NFS servers are up and healthy




• user is initiating mount from client by executing ls /mnt/usr/man (as example); timeout in auto.master is 2 minutes, fstype=nfs, options=ro,soft




• automount is successful, server A was chosen by autofs, and user can see listed man pages




• after 1m 10sec server (NFS) A goes down




• at 1m 20 sec user executes ls /mnt/usr/man again

What is happening is that it is locked - mount stays on server A and no user can go into /mnt/usr/man (nor lsof is working)

After waiting some minutes (ca 10 minutes)

ls: cannot open directory /mnt/usr/man: Input/output error

My question is: should autofs manage this scenario and automatically remount to server B? (even if mount timeout has not finished yet?)

I have read many articles and it looks like my scenario is not "autofs"'es duty (If I want something like this it should be done another way).

But I want to be sure 100% whether autofs should handle this situation itself or not.

automount autofs

share|improve this question

edited Dec 15 '14 at 18:27

HopelessN00b

48.7k25117194

asked Jan 13 '14 at 11:45

yusa.viktoryusa.viktor

63

share|improve this question

edited Dec 15 '14 at 18:27

HopelessN00b

48.7k25117194

asked Jan 13 '14 at 11:45

yusa.viktoryusa.viktor

63

share|improve this question

edited Dec 15 '14 at 18:27

HopelessN00b

48.7k25117194

asked Jan 13 '14 at 11:45

yusa.viktoryusa.viktor

63

edited Dec 15 '14 at 18:27

HopelessN00b

48.7k25117194

edited Dec 15 '14 at 18:27

HopelessN00b

48.7k25117194

asked Jan 13 '14 at 11:45

yusa.viktoryusa.viktor

63

asked Jan 13 '14 at 11:45

yusa.viktoryusa.viktor

63

1 Answer
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oldest

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I know this is pretty late to the party, but was the nfs-server service started on server B? I just ran into these exact symptoms, and that was the solution. Try running service nfs-server start on server B.

share|improve this answer

edited Sep 1 '16 at 15:51

answered Dec 15 '14 at 17:58

aletsonaletson

85

add a comment | 

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0

I know this is pretty late to the party, but was the nfs-server service started on server B? I just ran into these exact symptoms, and that was the solution. Try running service nfs-server start on server B.

share|improve this answer

edited Sep 1 '16 at 15:51

answered Dec 15 '14 at 17:58

aletsonaletson

85

add a comment | 

0

I know this is pretty late to the party, but was the nfs-server service started on server B? I just ran into these exact symptoms, and that was the solution. Try running service nfs-server start on server B.

share|improve this answer

edited Sep 1 '16 at 15:51

answered Dec 15 '14 at 17:58

aletsonaletson

85

add a comment | 

I know this is pretty late to the party, but was the nfs-server service started on server B? I just ran into these exact symptoms, and that was the solution. Try running service nfs-server start on server B.

share|improve this answer

edited Sep 1 '16 at 15:51

answered Dec 15 '14 at 17:58

aletsonaletson

85

share|improve this answer

edited Sep 1 '16 at 15:51

answered Dec 15 '14 at 17:58

aletsonaletson

85

answered Dec 15 '14 at 17:58

aletsonaletson

85

answered Dec 15 '14 at 17:58

aletsonaletson

85