Ian, Thanks for Support/Help :) 2009/8/24 Ian Kent <ikent@xxxxxxxxxx>: > Carlos André wrote: >> Hi Ian, >> >> Thanks for patch and sorry for delay (i'm expecting receive u reply on >> bug track, not here) :) >> >> But, this patch doesnt worked to me like expected... :( >> >> >> Firstly I've changed "#MOUNT_WAIT=-1" to "MOUNT_WAIT=10" >> and later changed "10" to "2" with same results... >> (always restarting service, of course :) >> >> Then, tried remove "sec=krb5p", and later removed "nfs4" but i got >> same results again. >> >> Or i'm doing something wrong? >> >> >> [root@KSTATION areas]# automount -V >> >> Linux automount version 5.0.1-0.rc2.131.bz517349.1 >> [...] >> >> [root@KSTATION areas]# time ls -la testdown >> ls: testedown: No such file or directory >> >> real 3m9.006s >> user 0m0.002s >> sys 0m0.000s > > OK, that isn't behaving the way I expect, I'll have a look. > >> >> >> LOGGING: >> ----------------------------------------- >> Aug 24 09:23:51 KSTATION automount[20803]: mount_mount: mount(nfs): >> calling mount -t nfs4 -s -o rw,acl,sec=krb5p 1.2.3.4:/areas/testdown >> /misc/areas/testdown >> Aug 24 09:27:00 KSTATION automount[20803]: mount(nfs): nfs: mount >> failure 1.2.3.4:/areas/testdown on /misc/areas/testdown >> Aug 24 09:27:00 KSTATION automount[20803]: ioctl_send_fail: token = 91 >> Aug 24 09:27:00 KSTATION automount[20803]: failed to mount /misc/areas/testdown >> ----------------------------------------- >> >> >> >> >> >> 2009/8/17 Ian Kent <ikent@xxxxxxxxxx>: >>> On Thu, 2009-08-13 at 12:18 -0300, Carlos André wrote: >>>> Filled bug report: >>>> https://bugzilla.redhat.com/show_bug.cgi?id=517349 >>> Hi Carlos, >>> >>> I have a patched source rpm to add a mount wait parameter to autofs >>> located at: >>> http://people.redhat.com/~ikent/autofs-5.0.1-0.rc2.131.bz517349.1 >>> >>> Could you build it and see if it works. >>> I haven't tested it at all but it is fairly straight forward. >>> It is still unclear if this is the right way to do this and what the >>> consequences are in sending a term signal to mount. This mount request >>> will likely be followed by other requests for the same mount causing an >>> accumulation of mount(8) processes waiting for RPC timeouts before they >>> can answer the TERM signal. >>> >>> Anyway, for information the patch included in the source rpm above is: >>> >>> autofs-5.0.4 - add mount wait parameter >>> >>> From: Ian Kent <raven@xxxxxxxxxx> >>> >>> Often delays when trying to mount from a server that is not reponding >>> for some reason are undesirable. To try and prevent these delays we >>> provide a configuration setting to limit the time that we wait for >>> our spawned mount(8) process to complete before sending it a SIGTERM >>> signal. This patch adds a configuration parameter to allow us to >>> request we limit the time we wait for mount(8) to complete before >>> send it a TERM signal. >>> --- >>> >>> daemon/spawn.c | 3 ++- >>> include/defaults.h | 2 ++ >>> lib/defaults.c | 13 +++++++++++++ >>> man/auto.master.5.in | 7 +++++++ >>> redhat/autofs.sysconfig.in | 9 +++++++++ >>> samples/autofs.conf.default.in | 9 +++++++++ >>> 6 files changed, 42 insertions(+), 1 deletion(-) >>> >>> >>> --- autofs-5.0.1.orig/daemon/spawn.c >>> +++ autofs-5.0.1/daemon/spawn.c >>> @@ -312,6 +312,7 @@ int spawn_mount(unsigned logopt, ...) >>> unsigned int options; >>> unsigned int retries = MTAB_LOCK_RETRIES; >>> int update_mtab = 1, ret, printed = 0; >>> + unsigned int wait = defaults_get_mount_wait(); >>> char buf[PATH_MAX]; >>> >>> /* If we use mount locking we can't validate the location */ >>> @@ -353,7 +354,7 @@ int spawn_mount(unsigned logopt, ...) >>> va_end(arg); >>> >>> while (retries--) { >>> - ret = do_spawn(logopt, -1, options, prog, (const char **) argv); >>> + ret = do_spawn(logopt, wait, options, prog, (const char **) argv); >>> if (ret & MTAB_NOTUPDATED) { >>> struct timespec tm = {3, 0}; >>> >>> --- autofs-5.0.1.orig/include/defaults.h >>> +++ autofs-5.0.1/include/defaults.h >>> @@ -24,6 +24,7 @@ >>> >>> #define DEFAULT_TIMEOUT 600 >>> #define DEFAULT_NEGATIVE_TIMEOUT 60 >>> +#define DEFAULT_MOUNT_WAIT -1 >>> #define DEFAULT_UMOUNT_WAIT 12 >>> #define DEFAULT_BROWSE_MODE 1 >>> #define DEFAULT_LOGGING 0 >>> @@ -62,6 +63,7 @@ struct ldap_schema *defaults_get_schema( >>> struct ldap_searchdn *defaults_get_searchdns(void); >>> void defaults_free_searchdns(struct ldap_searchdn *); >>> unsigned int defaults_get_append_options(void); >>> +unsigned int defaults_get_mount_wait(void); >>> unsigned int defaults_get_umount_wait(void); >>> const char *defaults_get_auth_conf_file(void); >>> unsigned int defaults_get_map_hash_table_size(void); >>> --- autofs-5.0.1.orig/lib/defaults.c >>> +++ autofs-5.0.1/lib/defaults.c >>> @@ -45,6 +45,7 @@ >>> #define ENV_NAME_VALUE_ATTR "VALUE_ATTRIBUTE" >>> >>> #define ENV_APPEND_OPTIONS "APPEND_OPTIONS" >>> +#define ENV_MOUNT_WAIT "MOUNT_WAIT" >>> #define ENV_UMOUNT_WAIT "UMOUNT_WAIT" >>> #define ENV_AUTH_CONF_FILE "AUTH_CONF_FILE" >>> >>> @@ -323,6 +324,7 @@ unsigned int defaults_read_config(unsign >>> check_set_config_value(key, ENV_NAME_ENTRY_ATTR, value, to_syslog) || >>> check_set_config_value(key, ENV_NAME_VALUE_ATTR, value, to_syslog) || >>> check_set_config_value(key, ENV_APPEND_OPTIONS, value, to_syslog) || >>> + check_set_config_value(key, ENV_MOUNT_WAIT, value, to_syslog) || >>> check_set_config_value(key, ENV_UMOUNT_WAIT, value, to_syslog) || >>> check_set_config_value(key, ENV_AUTH_CONF_FILE, value, to_syslog) || >>> check_set_config_value(key, ENV_MAP_HASH_TABLE_SIZE, value, to_syslog)) >>> @@ -652,6 +654,17 @@ unsigned int defaults_get_append_options >>> return res; >>> } >>> >>> +unsigned int defaults_get_mount_wait(void) >>> +{ >>> + long wait; >>> + >>> + wait = get_env_number(ENV_MOUNT_WAIT); >>> + if (wait < 0) >>> + wait = DEFAULT_MOUNT_WAIT; >>> + >>> + return (unsigned int) wait; >>> +} >>> + >>> unsigned int defaults_get_umount_wait(void) >>> { >>> long wait; >>> --- autofs-5.0.1.orig/man/auto.master.5.in >>> +++ autofs-5.0.1/man/auto.master.5.in >>> @@ -175,6 +175,13 @@ Set the default timeout for caching fail >>> 60). If the equivalent command line option is given it will override this >>> setting. >>> .TP >>> +.B MOUNT_WAIT >>> +Set the default time to wait for a response from a spawned mount(8) >>> +before sending it a SIGTERM. Note that we still need to wait for the >>> +RPC layer to timeout before the sub-process exits so this isn't ideal >>> +but it is the best we can do. The default is to wait until mount(8) >>> +returns without intervention. >>> +.TP >>> .B UMOUNT_WAIT >>> Set the default time to wait for a response from a spawned umount(8) >>> before sending it a SIGTERM. Note that we still need to wait for the >>> --- autofs-5.0.1.orig/redhat/autofs.sysconfig.in >>> +++ autofs-5.0.1/redhat/autofs.sysconfig.in >>> @@ -14,6 +14,15 @@ TIMEOUT=300 >>> # >>> #NEGATIVE_TIMEOUT=60 >>> # >>> +# MOUNT_WAIT - time to wait for a response from umount(8). >>> +# Setting this timeout can cause problems when >>> +# mount would otherwise wait for a server that >>> +# is temporarily unavailable, such as when it's >>> +# restarting. The defailt of waiting for mount(8) >>> +# usually results in a wait of around 3 minutes. >>> +# >>> +#MOUNT_WAIT=-1 >>> +# >>> # UMOUNT_WAIT - time to wait for a response from umount(8). >>> # >>> #UMOUNT_WAIT=12 >>> --- autofs-5.0.1.orig/samples/autofs.conf.default.in >>> +++ autofs-5.0.1/samples/autofs.conf.default.in >>> @@ -14,6 +14,15 @@ TIMEOUT=300 >>> # >>> #NEGATIVE_TIMEOUT=60 >>> # >>> +# MOUNT_WAIT - time to wait for a response from umount(8). >>> +# Setting this timeout can cause problems when >>> +# mount would otherwise wait for a server that >>> +# is temporarily unavailable, such as when it's >>> +# restarting. The defailt of waiting for mount(8) >>> +# usually results in a wait of around 3 minutes. >>> +# >>> +#MOUNT_WAIT=-1 >>> +# >>> # UMOUNT_WAIT - time to wait for a response from umount(8). >>> # >>> #UMOUNT_WAIT=12 >>> >>> >>>> Thanks! >>>> >>>> 2009/8/13 Carlos André <candrecn@xxxxxxxxx>: >>>>> 2009/8/13 Ian Kent <ikent@xxxxxxxxxx>: >>>>>> Carlos André wrote: >>>>>>> Today (2009-08-12) I'm using: >>>>>>> kernel-2.6.18-128.2.1.el5 >>>>>>> autofs-5.0.1-0.rc2.102.el5_3.1 >>>>>> Thanks, >>>>>> >>>>>> My mistake, the wait time I was referring to is used for umounts during >>>>>> expires and is present in rev rc2.102. >>>>>> >>>>>> It shouldn't be hard to add this for mount as well. >>>>>> Would you like me to put something together? >>>>> Sure! that 'll help me a lot (and for sure another ppl) :) Thanks :) >>>>> >>>>>> Probably would be good to test something out to see if we can make a >>>>>> difference with the killing mount after some configured timeout but, if >>>>>> we make progress, probably the best way to deal with it is for you to >>>>>> log a bug against rhel-5 so I can get it committed to the rhel package. >>>>>> The possible issue is that I'm not sure if the RPC subsystem in the >>>>>> above rhel kernel will respond well to process death with potential >>>>>> outstanding requests. But we'll see. >>>>> Ok, on my way :) >>>>> >>>>> Thanks a lot! >>>>> >>>>>>> >>>>>>> Look my last test: >>>>>>> -------------------------------------------------------------- >>>>>>> [root@KSTATION areas]# time ls testdown >>>>>>> ls: testdown: No such file or directory >>>>>>> >>>>>>> real 3m9.025s >>>>>>> user 0m0.000s >>>>>>> sys 0m0.002s >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> Aug 12 12:57:07 KSTATION automount[15471]: sun_mount: parse(sun): >>>>>>> mounting root /misc/areas, mountpoint testdown, what >>>>>>> 1.2.3.4:/areas/testdown, fstype nfs4, options >>>>>>> acl,sec=krb5p,proto=tcp,retry=0 >>>>>>> Aug 12 12:57:07 KSTATION automount[15471]: do_mount: >>>>>>> 1.2.3.4:/areas/testdown /misc/areas/testdown type nfs4 options >>>>>>> acl,sec=krb5p,proto=tcp,retry=0 using module nfs4 >>>>>>> Aug 12 12:57:07 KSTATION automount[15471]: mount_mount: mount(nfs): >>>>>>> root=/misc/areas name=testdown what=1.2.3.4:/areas/testdown, >>>>>>> fstype=nfs4, options=acl,sec=krb5p,proto=tcp,retry=0 >>>>>>> Aug 12 12:57:07 KSTATION automount[15471]: mount_mount: mount(nfs): >>>>>>> nfs options="acl,sec=krb5p,proto=tcp,retry=0", nosymlink=0, ro=0 >>>>>>> Aug 12 12:57:07 KSTATION automount[15471]: mount_mount: mount(nfs): >>>>>>> calling mkdir_path /misc/areas/testdown >>>>>>> Aug 12 12:57:07 KSTATION automount[15471]: mount_mount: mount(nfs): >>>>>>> calling mount -t nfs4 -s -o acl,sec=krb5p,proto=tcp,retry=0 >>>>>>> 1.2.3.4:/areas/testdown /misc/areas/testdown >>>>>>> Aug 12 12:58:12 KSTATION automount[15471]: st_expire: state 1 path /misc >>>>>>> Aug 12 12:58:12 KSTATION automount[15471]: expire_proc: exp_proc = >>>>>>> 3078093712 path /misc >>>>>>> Aug 12 12:58:13 KSTATION automount[15471]: expire_proc_indirect: 2 >>>>>>> submounts remaining in /misc >>>>>>> Aug 12 12:58:13 KSTATION automount[15471]: expire_cleanup: got thid >>>>>>> 3078093712 path /misc stat 3 >>>>>>> Aug 12 12:58:13 KSTATION automount[15471]: expire_cleanup: sigchld: >>>>>>> exp 3078093712 finished, switching from 2 to 1 >>>>>>> Aug 12 12:58:13 KSTATION automount[15471]: st_ready: st_ready(): state >>>>>>> = 2 path /misc >>>>>>> Aug 12 12:59:28 KSTATION automount[15471]: st_expire: state 1 path /misc >>>>>>> Aug 12 12:59:28 KSTATION automount[15471]: expire_proc: exp_proc = >>>>>>> 3078093712 path /misc >>>>>>> Aug 12 12:59:28 KSTATION automount[15471]: expire_proc_indirect: 2 >>>>>>> submounts remaining in /misc >>>>>>> Aug 12 12:59:28 KSTATION automount[15471]: expire_cleanup: got thid >>>>>>> 3078093712 path /misc stat 3 >>>>>>> Aug 12 12:59:28 KSTATION automount[15471]: expire_cleanup: sigchld: >>>>>>> exp 3078093712 finished, switching from 2 to 1 >>>>>>> Aug 12 12:59:28 KSTATION automount[15471]: st_ready: st_ready(): state >>>>>>> = 2 path /misc >>>>>>> Aug 12 13:00:16 KSTATION automount[15471]: >> mount: mount to NFS >>>>>>> server '1.2.3.4' failed: timed out (giving up). >>>>>>> Aug 12 13:00:16 KSTATION automount[15471]: mount(nfs): nfs: mount >>>>>>> failure 1.2.3.4:/areas/testdown on /misc/areas/testdown >>>>>>> Aug 12 13:00:16 KSTATION automount[15471]: send_fail: token = 17 >>>>>>> Aug 12 13:00:16 KSTATION automount[15471]: failed to mount /misc/areas/testdown >>>>>>> Aug 12 13:00:43 KSTATION automount[15471]: st_expire: state 1 path /misc >>>>>>> -------------------------------------------------------------- >>>>>>> >>>>>>> 2009/8/12 Ian Kent <ikent@xxxxxxxxxx>: >>>>>>>> Carlos André wrote: >>>>>>>>> Hi Ian, >>>>>>>>> I'm getting crazy trying put "retry=" to work on mount... this option >>>>>>>>> just DONT WORK if use proto=tcp and/OR kerberos (sec=krb5/krb5i/krb5p) >>>>>>>>> like you can see on my previous emails... >>>>>>>> Right, my mistake for not looking closely enough at post. >>>>>>>> >>>>>>>> Maybe this is related to the same sort of problem we had with mount in >>>>>>>> the past, before the options parsing went into the kernel, where other >>>>>>>> services, like portmapper (or rpcbind), were being done with different >>>>>>>> timeout parameters before the RPC calls for mounting. That's just an >>>>>>>> example as NFSv4 shouldn't be sensitive to portmapper anyway. >>>>>>>> >>>>>>>> But what version of autofs and kernel did you say you were using? >>>>>>>> >>>>>>>>> I appreciate any help. >>>>>>>>> >>>>>>>>> Carlos. >>>>>>>>> >>>>>>>>> >>>>>>>>> 2009/8/12 Ian Kent <ikent@xxxxxxxxxx>: >>>>>>>>>> Chuck Lever wrote: >>>>>>>>>>> On Aug 11, 2009, at 8:41 AM, Carlos André wrote: >>>>>>>>>>>> This long timeout is good if workstation need mount a critical >>>>>>>>>>>> directory using /etc/fstab on boot (for example).. >>>>>>>>>>>> But in my case, using this loooong timeout doesnt make any sense, >>>>>>>>>>>> since autofs retry mount directory on-access. This in fact gives me >>>>>>>>>>>> alot of headaches, coz user login 'll just hangs if one server goes >>>>>>>>>>>> down for any reason, and will again hangs if user try access directory >>>>>>>>>>>> pointing to a NFS down server... >>>>>>>>>>> "retry=0" means the mount command will fail as soon as the first >>>>>>>>>>> mount(2) system call fails. When you set SYN retries to 1, this means >>>>>>>>>>> after 9 seconds, the connect fails, and that causes the mount(2) system >>>>>>>>>>> call to fail. >>>>>>>>>>> >>>>>>>>>>> Recent conversations with Ian suggested that a long timeout was desired >>>>>>>>>>> for automounter as well as other cases. Ian, is there something else we >>>>>>>>>>> need to consider to determine the correct retry timeout for NFS/TCP >>>>>>>>>>> mount points handled via automounter? How should mount.nfs wait so we >>>>>>>>>>> don't make other use cases worse? (Looks like most of the history is >>>>>>>>>>> intact below). >>>>>>>>>> Of course we know that autofs is entirely at the mercy of mount(8) (and >>>>>>>>>> mount.nfs in particular). This has always been a difficult situation for >>>>>>>>>> the automounter because interactive mount invocations should wait. But I >>>>>>>>>> believe automount mounts should always time out quickly, but that leads >>>>>>>>>> to its own set of problems, especially when home directories are concerned. >>>>>>>>>> >>>>>>>>>> I think adding "retry=0" is the right thing to do myself but I'm not >>>>>>>>>> certain that will work as we expect. I'll have to do some experimentation. >>>>>>>>>> >>>>>>>>>>> How long do you think is appropriate for the automounter to wait if the >>>>>>>>>>> server is down, in your case, Carlos? >>>>>>>>>>> >>>>>>>>>>>> Am losing something or there have was something weirdo...!? >>>>>>>>>>>> ------------------------------------------------ >>>>>>>>>>>> [root@KSTATION ~]# echo 5 > /proc/sys/net/ipv4/tcp_syn_retries [DEFAULT] >>>>>>>>>>>> [root@KSTATION ~]# time mount 1.2.3.4:/blabla /tmp/ -t nfs4 -o >>>>>>>>>>>> proto=tcp,retry=1 >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (giving up). >>>>>>>>>>>> >>>>>>>>>>>> real 3m9.000s >>>>>>>>>>>> user 0m0.002s >>>>>>>>>>>> sys 0m0.001s >>>>>>>>>>>> [root@KSTATION ~]# time mount 1.2.3.4:/blabla /tmp/ -t nfs4 -o >>>>>>>>>>>> sec=krb5p,proto=tcp,retry=1 >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (giving up). >>>>>>>>>>>> >>>>>>>>>>>> real 3m9.000s >>>>>>>>>>>> user 0m0.000s >>>>>>>>>>>> sys 0m0.002s >>>>>>>>>>>> [root@KSTATION ~]# time mount 1.2.3.4:/blabla /tmp/ -t nfs4 -o >>>>>>>>>>>> proto=tcp,retry=0 >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (giving up). >>>>>>>>>>>> >>>>>>>>>>>> real 3m9.001s >>>>>>>>>>>> user 0m0.000s >>>>>>>>>>>> sys 0m0.003s >>>>>>>>>>>> [root@KSTATION ~]# time mount 1.2.3.4:/blabla /tmp/ -t nfs4 -o >>>>>>>>>>>> sec=krb5p,proto=tcp,retry=0 >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (giving up). >>>>>>>>>>>> >>>>>>>>>>>> real 3m9.001s >>>>>>>>>>>> user 0m0.002s >>>>>>>>>>>> sys 0m0.001s >>>>>>>>>>>> >>>>>>>>>>>> [root@KSTATION ~]# echo 1 > /proc/sys/net/ipv4/tcp_syn_retries [ 5 to 1 ] >>>>>>>>>>>> >>>>>>>>>>>> [root@KSTATION ~]# time mount 1.2.3.4:/blabla /tmp/ -t nfs4 -o >>>>>>>>>>>> proto=tcp,retry=1 >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). [x 6] >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (giving up). >>>>>>>>>>>> >>>>>>>>>>>> real 1m3.002s >>>>>>>>>>>> user 0m0.000s >>>>>>>>>>>> sys 0m0.002s >>>>>>>>>>>> [root@KSTATION ~]# time mount 1.2.3.4:/blabla /tmp/ -t nfs4 -o >>>>>>>>>>>> sec=krb5p,proto=tcp,retry=1 >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). [x 13] >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (giving up). >>>>>>>>>>>> >>>>>>>>>>>> real 2m6.000s >>>>>>>>>>>> user 0m0.000s >>>>>>>>>>>> sys 0m0.002s >>>>>>>>>>>> [root@KSTATION ~]# time mount 1.2.3.4:/blabla /tmp/ -t nfs4 -o >>>>>>>>>>>> proto=tcp,retry=0 >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (giving up). >>>>>>>>>>>> >>>>>>>>>>>> real 0m9.003s >>>>>>>>>>>> user 0m0.001s >>>>>>>>>>>> sys 0m0.002s >>>>>>>>>>>> [root@KSTATION ~]# time mount 1.2.3.4:/blabla /tmp/ -t nfs4 -o >>>>>>>>>>>> sec=krb5p,proto=tcp,retry=0 >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). [x 13] >>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (giving up). >>>>>>>>>>>> >>>>>>>>>>>> real 2m6.001s >>>>>>>>>>>> user 0m0.001s >>>>>>>>>>>> sys 0m0.002s >>>>>>>>>>>> [root@KSTATION ~]# >>>>>>>>>>>> ------------------------------------------------ >>>>>>>>>>>> max timeout goes to 2m6s changing tcp_syn_retries from 5 to 1... and >>>>>>>>>>>> using retry=0 without kerberos I got only 9s... >>>>>>>>>>>> >>>>>>>>>>>> *sigh* >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> 2009/8/10 Chuck Lever <chuck.lever@xxxxxxxxxx>: >>>>>>>>>>>>> On Aug 10, 2009, at 4:05 PM, Carlos André wrote: >>>>>>>>>>>>>> Something funny: Using default tcp_syn_retries (5) i got >>>>>>>>>>>>>> "3,6,12,24,48,96" secs interval... but if i change tcp_syn_retries to >>>>>>>>>>>>>> 1 i got "3,6,3,6,3,6..." secs interval... >>>>>>>>>>>>> Right. Normally the RPC client calls the kernel's socket connect >>>>>>>>>>>>> function, >>>>>>>>>>>>> which does 6 SYN retries. That one call usually takes longer than >>>>>>>>>>>>> the RPC >>>>>>>>>>>>> client's connect timeout, so it only makes one connect call, and then >>>>>>>>>>>>> fails. >>>>>>>>>>>>> >>>>>>>>>>>>> Reducing the number of SYN retries per connect attempt causes the RPC >>>>>>>>>>>>> client >>>>>>>>>>>>> to retry the connect call until its connect timeout expires. Each >>>>>>>>>>>>> connect >>>>>>>>>>>>> call resets the SYN timeout to 3 seconds. >>>>>>>>>>>>> >>>>>>>>>>>>>> [root@KSERVER mnt]# time mount 1.2.3.4:/blabla tmp/ -t nfs4 -o >>>>>>>>>>>>>> sec=krb5p,proto=tcp >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (giving up). >>>>>>>>>>>>>> >>>>>>>>>>>>>> real 3m9.000s >>>>>>>>>>>>>> user 0m0.000s >>>>>>>>>>>>>> sys 0m0.002s >>>>>>>>>>>>>> >>>>>>>>>>>>>> [root@KSERVER /]# echo 1 > /proc/sys/net/ipv4/tcp_syn_retries >>>>>>>>>>>>>> [root@KSERVER mnt]# time mount 1.2.3.4:/blabla tmp/ -t nfs4 -o >>>>>>>>>>>>>> sec=krb5p,proto=tcp ("retry=1" = no change) >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (retrying). >>>>>>>>>>>>>> mount: mount to NFS server '1.2.3.4' failed: timed out (giving up). >>>>>>>>>>>>>> >>>>>>>>>>>>>> real 2m6.004s >>>>>>>>>>>>>> user 0m0.000s >>>>>>>>>>>>>> sys 0m0.004s >>>>>>>>>>>>>> >>>>>>>>>>>>>> (3,6,3,6... secs interval) >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> 2009/8/10 Carlos André <candrecn@xxxxxxxxx>: >>>>>>>>>>>>>>> No, i'm just using packages from CentOS repo... >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> And u're right about expo retries... with tcpdump i've monitored >>>>>>>>>>>>>>> traffic and i got SYN retries in 3, 6, 12, 24, 48, 96 secs on port >>>>>>>>>>>>>>> 2049... >>>>>>>>>>>>>>> I tried use "retry=1" option on mount without any change... I dont >>>>>>>>>>>>>>> want change source or tcp timers... just NFSv4 client. >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> 2009/8/10 Chuck Lever <chuck.lever@xxxxxxxxxx>: >>>>>>>>>>>>>>>> On Aug 10, 2009, at 2:29 PM, Carlos André wrote: >>>>>>>>>>>>>>>>> Bruce, no... you're right. I'm describing a situation where my >>>>>>>>>>>>>>>>> server >>>>>>>>>>>>>>>>> died... i need mount fail faster (10 or 15 secs max) than 3 minutes >>>>>>>>>>>>>>>>> and 9 seconds... >>>>>>>>>>>>>>>> The 189 second timeout is likely how long it takes the kernel to >>>>>>>>>>>>>>>> give up >>>>>>>>>>>>>>>> trying to connect a TCP socket to the server (6 SYN attempts with >>>>>>>>>>>>>>>> exponential retries, or something like that). For stock CentOS >>>>>>>>>>>>>>>> 5.3, I >>>>>>>>>>>>>>>> think >>>>>>>>>>>>>>>> user space does only a DNS lookup for normal NFSv4 mounts -- the >>>>>>>>>>>>>>>> kernel >>>>>>>>>>>>>>>> just >>>>>>>>>>>>>>>> tries to connect a TCP socket to port 2049, with no preceding rpcbind >>>>>>>>>>>>>>>> request. >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Carlos, let us know if you have replaced any NFS-related CentOS >>>>>>>>>>>>>>>> components >>>>>>>>>>>>>>>> (kernel, nfs-utils) with something you've built yourself. >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> 2009/8/7 J. Bruce Fields <bfields@xxxxxxxxxxxx>: >>>>>>>>>>>>>>>>>> On Fri, Aug 07, 2009 at 09:42:18AM +0300, Benny Halevy wrote: >>>>>>>>>>>>>>>>>>> On Aug. 07, 2009, 3:18 +0300, Carlos André <candrecn@xxxxxxxxx> >>>>>>>>>>>>>>>>>>> wrote: >>>>>>>>>>>>>>>>>>>> Anyone ? >>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>> 2009/7/29 Carlos André <candrecn@xxxxxxxxx>: >>>>>>>>>>>>>>>>>>>>> PPL, I need put a CentOS 5.3 (updated) NFSv4 server to work with >>>>>>>>>>>>>>>>>>>>> Kerberos >>>>>>>>>>>>>>>>>>>>> and AutoFS, but i got a problem: If NFS server goes down i get a >>>>>>>>>>>>>>>>>>>>> LOOOOOOONG >>>>>>>>>>>>>>>>>>>>> mount timeout on CentOS 5.3 (updated) NFSv4 client... >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> Since i need mount some (3 to 6) dirs at user logon process, if >>>>>>>>>>>>>>>>>>>>> mount >>>>>>>>>>>>>>>>>>>>> hangs, >>>>>>>>>>>>>>>>>>>>> user logon hangs. Then i want configure it to timeout (if server >>>>>>>>>>>>>>>>>>>>> down) >>>>>>>>>>>>>>>>>>>>> after >>>>>>>>>>>>>>>>>>>>> 10-15 secs (MAX) on each mount attempt. >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> I already make a lab and tried a LOT of combinations, there my >>>>>>>>>>>>>>>>>>>>> findings >>>>>>>>>>>>>>>>>>>>> (server DOWN IP: 172.16.0.10 / client IP: 172.16.1.10) using >>>>>>>>>>>>>>>>>>>>> basic >>>>>>>>>>>>>>>>>>>>> command >>>>>>>>>>>>>>>>>>>>> (time mount 172.16.0.10:/remotedir /localdir/ -t nfs4 -o >>>>>>>>>>>>>>>>>>>>> sec=krb5,proto=<tcp/udp>) from NFS client: >>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>> - Once i try access mount point using AutoFS (proto=tcp OR >>>>>>>>>>>>>>>>>>>>> proto=udp) >>>>>>>>>>>>>>>>>>>>> it >>>>>>>>>>>>>>>>>>>>> hangs for 189 secs (3m9s: real 3m9.001s) until show error >>>>>>>>>>>>>>>>>>>>> (mount: >>>>>>>>>>>>>>>>>>>>> mount to >>>>>>>>>>>>>>>>>>>>> NFS server '172.16.0.10' failed: timed out (giving up)) >>>>>>>>>>>>>>>>>>> Sounds like you're hitting the server's grace period. >>>>>>>>>>>>>>>>>> I thought he was describing a situation where the server the server >>>>>>>>>>>>>>>>>> is completely gone and isn't coming back, and wondering how to make >>>>>>>>>>>>>>>>>> the >>>>>>>>>>>>>>>>>> mount fail faster. But I may be misunderstanding. >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> --b. >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>>> To unsubscribe from this list: send the line "unsubscribe >>>>>>>>>>>>>>>>> linux-nfs" in >>>>>>>>>>>>>>>>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>>>>>>>>>>>>>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>> Chuck Lever >>>>>>>>>>>>>>>> chuck[dot]lever[at]oracle[dot]com >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>> -- >>>>>>>>>>>>> Chuck Lever >>>>>>>>>>>>> chuck[dot]lever[at]oracle[dot]com >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> Chuck Lever >>>>>>>>>>> chuck[dot]lever[at]oracle[dot]com >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>> >>> > > -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
