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lockd(1M) lockd(1M)

NAME

lockd: rpc.lockd - network lock daemon

SYNOPSIS

/usr/sbin/rpc.lockd

[-g graceperiod][-l

listen_min_backlog][

-t timeout][nthreads]

DESCRIPTION

The lockd utility is part of the NFS lock manager, which supports record lock and share lock operations on

NFS ﬁles. See fcntl(2) and lockf(2).

lockd provides two functions:

• It forwards fcntl(2) locking requests for NFS mounted ﬁle systems to the lockd on the NFS server.

• It generates local ﬁle locking operations in response to requests forwarded from

lockd running on

NFS client machines.

State information kept by the lockd about these locking requests can be lost if

lockd is killed or the

operating system is rebooted. Some of this information can be recovered as follows. When a server recov-

ers, it waits for a grace period for all NFS client-site

lockd to submit reclaim requests. Client-site lockd

is notiﬁed by the statd(1M) of the server recovery, and promptly resubmits previously granted lock

requests. If a

lockd fails to secure a previously granted lock at the server site, then the

lockd sends a

SIGLOST to the process holding that lock.

Administrators can make changes to the startup parameters for

lockd by logging in as root and editing

the

/etc/default/nfs

ﬁle (see nfs(4)). Administrators can also make changes by using the seton-

cenv

command.

Options

lockd recognizes the following options and command-line arguments:

-g graceperiod Deprecated in favor of the LOCKD_GRACE_PERIOD

parameter in the NFS

default ﬁle, which is equivalent. Specify the number of seconds that all clients

(both NLM and NFSv4) have to reclaim locks after the server reboots. This option

also controls the NFSv4 lease interval. The default value is 90 seconds.

-l listen_min_backlog

Specify the listener backlog, listen_min_backlog, which is the number of connect

requests that are queued and waiting to be processed before new connect requests

begin to get dropped.

-t timeout Specify the number of seconds to wait before retransmitting a lock request to the

remote server. The default value is 5 seconds. Equivalent to the

LOCKD_RETRANSMIT_TIMEOUT

parameter in the NFS default ﬁle.

nthreads Specify the maximum number of concurrent threads that the server can handle.

This concurrency is achieved by up to nthreads threads created as needed in the

kernel. nthreads should be based on the load expected on this server. If nthreads

is not speciﬁed, the maximum number of concurrent threads will default to 20.

Equivalent to the

LOCKD_SERVERS

parameter in the NFS default ﬁle.

Notes

A directory service that provides service name data base support must have the following service entries in

its database:

lockd 4045/udp # NFS lockd daemon/manager for udp

lockd 4045/tcp # NFS lockd daemon/manager for tcp

AUTHOR

lockd was developed by Sun Microsystems, Inc. and HP.