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exportfs
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#!/bin/sh
# exportfs
#
# Description: Manages nfs exported file system.
#
# (c) 2010 Ben Timby, Florian Haas, Dejan Muhamedagic,
# and Linux-HA contributors
#
# License: GNU General Public License v2 (GPLv2) and later
#######################################################################
# Initialization:
: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs
# Defaults
OCF_RESKEY_unlock_on_stop_default=1
OCF_RESKEY_wait_for_leasetime_on_stop_default=0
OCF_RESKEY_rmtab_backup_default=".rmtab"
: ${OCF_RESKEY_unlock_on_stop=${OCF_RESKEY_unlock_on_stop_default}}
: ${OCF_RESKEY_wait_for_leasetime_on_stop=${OCF_RESKEY_wait_for_leasetime_on_stop_default}}
: ${OCF_RESKEY_rmtab_backup=${OCF_RESKEY_rmtab_backup_default}}
#######################################################################
exportfs_meta_data() {
cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="exportfs">
<version>1.0</version>
<longdesc lang="en">
Exportfs uses the exportfs command to add/remove nfs exports.
It does NOT manage the nfs server daemon.
It depends on Linux specific NFS implementation details,
so is considered not portable to other platforms yet.
</longdesc>
<shortdesc lang="en">
Manages NFS exports
</shortdesc>
<parameters>
<parameter name="clientspec" unique="0" required="1">
<longdesc lang="en">
The client specification allowing remote machines to mount the directory
(or directories) over NFS.
</longdesc>
<shortdesc lang="en">
Client ACL.
</shortdesc>
<content type="string" />
</parameter>
<parameter name="options" unique="0" required="0">
<longdesc lang="en">
The options to pass to exportfs for the exported directory
or directories.
</longdesc>
<shortdesc lang="en">
Export options.
</shortdesc>
<content type="string" />
</parameter>
<parameter name="directory" unique="0" required="1">
<longdesc lang="en">
The directory or directories to be exported using NFS. Multiple
directories are separated by white space.
</longdesc>
<shortdesc lang="en">
The directory or directories to export.
</shortdesc>
<content type="string" />
</parameter>
<parameter name="fsid" unique="1" required="1">
<longdesc lang="en">
The fsid option to pass to exportfs. This can be a unique positive
integer, a UUID, or the special string "root" which is functionally
identical to numeric fsid of 0.
If multiple directories are being exported, then they are
assigned ids sequentially starting with this fsid (fsid, fsid+1,
fsid+2, ...). Obviously, in that case the fsid must be an
integer.
0 (root) identifies the export as the root of an NFSv4
pseudofilesystem -- avoid this setting unless you understand its
special status.
This value will override any fsid provided via the options parameter.
</longdesc>
<shortdesc lang="en">
Unique fsid within cluster or starting fsid for multiple exports.
</shortdesc>
<content type="string" />
</parameter>
<parameter name="unlock_on_stop">
<longdesc lang="en">
Relinquish NFS locks associated with this filesystem when the resource
stops. Enabling this parameter is highly recommended unless the path exported
by this ${__SCRIPT_NAME} resource is also exported by a different resource.
Note: Unlocking is only possible on Linux systems where
/proc/fs/nfsd/unlock_filesystem exists and is writable. If your system does
not fulfill this requirement (on account of having an nonrecent kernel,
for example), you may set this parameter to 0 to silence the associated
warning.
</longdesc>
<shortdesc lang="en">
Unlock filesystem on stop?
</shortdesc>
<content type="boolean" default="${OCF_RESKEY_unlock_on_stop_default}" />
</parameter>
<parameter name="wait_for_leasetime_on_stop">
<longdesc lang="en">
When stopping (unexporting), wait out the NFSv4 lease time.
Only after all leases have expired does the NFS kernel server
relinquish all server-side handles on the exported filesystem.
If this ${__SCRIPT_NAME} resource manages an export that resides
on a mount point designed to fail over along with the NFS export
itself, then enabling this parameter will ensure such failover
is working properly. Note that when this parameter is set, your
stop timeout MUST accommodate for the wait period. This parameter
is safe to disable if none of your NFS clients are using NFS
version 4 or later.
</longdesc>
<shortdesc lang="en">
Ride out the NFSv4 lease time on resource stop?
</shortdesc>
<content type="boolean" default="${OCF_RESKEY_wait_for_leasetime_on_stop_default}" />
</parameter>
<parameter name="rmtab_backup">
<longdesc lang="en">
Back up those entries from the NFS rmtab that apply to the exported
directory, to the specified backup file. The filename is interpreted
as relative to the exported directory. This backup is required if
clients are connecting to the export via NFSv3 over TCP. Note that a
configured monitor operation is required for this functionality.
To disable rmtab backups, set this parameter to the special
string "none".
</longdesc>
<shortdesc lang="en">
Location of the rmtab backup, relative to directory.
</shortdesc>
<content type="string" default="${OCF_RESKEY_rmtab_backup_default}" />
</parameter>
</parameters>
<actions>
<action name="start" timeout="40" />
<action name="stop" timeout="120" />
<action name="monitor" depth="0" timeout="20" interval="10" />
<action name="meta-data" timeout="5" />
<action name="validate-all" timeout="30" />
</actions>
</resource-agent>
END
return $OCF_SUCCESS
}
exportfs_methods() {
cat <<-!
start
stop
status
monitor
validate-all
methods
meta-data
usage
!
}
reset_fsid() {
CURRENT_FSID=$OCF_RESKEY_fsid
}
bump_fsid() {
CURRENT_FSID=$((CURRENT_FSID+1))
}
get_fsid() {
echo $CURRENT_FSID
}
# run a function on all directories
forall() {
local func=$1
shift 1
local fast_exit=""
local dir rc=0
if [ "$2" = fast_exit ]; then
fast_exit=1
shift 1
fi
reset_fsid
for dir in $OCF_RESKEY_directory; do
$func $dir "$@"
rc=$(($rc | $?))
bump_fsid
[ "$fast_exit" ] && continue
[ $rc -ne 0 ] && return $rc
done
return $rc
}
backup_rmtab() {
local dir=$1
local rmtab_backup
rmtab_backup="$dir/${OCF_RESKEY_rmtab_backup}"
grep ":$dir:" /var/lib/nfs/rmtab > ${rmtab_backup}
}
restore_rmtab() {
local dir=$1
local rmtab_backup
rmtab_backup="$dir/${OCF_RESKEY_rmtab_backup}"
if [ -r ${rmtab_backup} ]; then
local tmpf=`mktemp`
sort -u ${rmtab_backup} /var/lib/nfs/rmtab > $tmpf &&
install -o root -m 644 $tmpf /var/lib/nfs/rmtab
rm -f $tmpf
ocf_log debug "Restored `wc -l ${rmtab_backup}` rmtab entries from ${rmtab_backup}."
else
ocf_log warn "rmtab backup ${rmtab_backup} not found or not readable."
fi
}
exportfs_usage() {
cat <<END
usage: $0 {start|stop|monitor|status|validate-all|meta-data}
END
}
format_exports() {
# exportfs output wraps lines for long export directory names.
# We unwrap here with sed.
# We then do a literal match on the full line (grep -x -F)
exportfs |
sed -e '$! N; s/\n[[:space:]]\+/ /; t; s/[[:space:]]\+\([^[:space:]]\+\)\(\n\|$\)/ \1\2/g; P;D;'
}
is_exported() {
local dir=$1
local spec=$2
local rc
format_exports | grep -q -x -F "$dir $spec"
rc=$?
if [ $rc -ne 0 -a "$spec" = "*" ]; then
# on some platforms, exportfs may print
# "<world>" instead of "*"
format_exports | grep -q -x -F "$dir <world>"
rc=$?
fi
# log something only for monitors
if [ $rc -ne 0 -a "$__OCF_ACTION" = "monitor" ]; then
local sev="info"
ocf_is_probe || sev="err"
ocf_log $sev "$dir not exported to $spec (stopped)."
fi
return $rc
}
exportfs_monitor ()
{
if forall is_exported "${OCF_RESKEY_clientspec}"; then
if [ ${OCF_RESKEY_rmtab_backup} != "none" ]; then
forall backup_rmtab
fi
return $OCF_SUCCESS
else
return $OCF_NOT_RUNNING
fi
}
export_one() {
local dir=$1
local opts sep
sep=""
if [ -n "$OCF_RESKEY_options" ]; then
opts="$OCF_RESKEY_options"
sep=","
fi
if echo "$opts" | grep fsid >/dev/null; then
#replace fsid in options list
opts=`echo "$opts" | sed "s/fsid=[0-9]\+/fsid=$(get_fsid)/g"`
else
#tack the fsid option onto our options list.
opts="${opts}${sep}fsid=$(get_fsid)"
fi
opts="-o $opts"
# if any of directories fails to export we can exit
# immediately
ocf_run exportfs -v $opts "${OCF_RESKEY_clientspec}:$dir"
if [ $? -ne 0 ]; then
ocf_exit_reason "exportfs failed - exportfs -v $opts ${OCF_RESKEY_clientspec}:$dir"
exit $OCF_ERR_GENERIC
fi
ocf_log info "directory $dir exported"
return $OCF_SUCCESS
}
exportfs_start ()
{
if exportfs_monitor; then
ocf_log debug "already exported"
return $OCF_SUCCESS
fi
ocf_log info "Exporting file system(s) ..."
forall export_one
# Restore the rmtab to ensure smooth NFS-over-TCP failover
if [ ${OCF_RESKEY_rmtab_backup} != "none" ]; then
forall restore_rmtab
fi
}
unlock_fs() {
local dir=$1
local unlockfile
unlockfile=/proc/fs/nfsd/unlock_filesystem
if [ -w ${unlockfile} ]; then
echo "$dir" > ${unlockfile}
ocf_log info "Unlocked NFS export $dir"
else
ocf_log warn "Unable to unlock NFS export $dir, ${unlockfile} not found or not writable"
fi
}
wait_for_leasetime() {
local leasetimefile
local sleeptime
leasetimefile=/proc/fs/nfsd/nfsv4leasetime
if [ -r ${leasetimefile} ]; then
sleeptime=$((`cat ${leasetimefile}`+2))
ocf_log info "Sleeping ${sleeptime} seconds to accommodate for NFSv4 lease expiry"
sleep ${sleeptime}s
else
ocf_log warn "Unable to read NFSv4 lease time from ${leasetimefile}, file not found or not readable"
fi
}
cleanup_export_cache() {
# see if the cache is blocking unexport
local contentfile=/proc/net/rpc/nfsd.export/content
local fsid_re
local i=1
fsid_re="fsid=(echo `forall get_fsid`|sed 's/ /|/g'),"
while :; do
grep -E -q "$fsid_re" $contentfile ||
break
ocf_log info "Cleanup export cache ... (try $i)"
ocf_run exportfs -f
sleep 0.5
i=$((i + 1))
done
}
unexport_one() {
local dir=$1
ocf_run exportfs -v -u ${OCF_RESKEY_clientspec}:$dir
}
exportfs_stop ()
{
local rc
exportfs_monitor
if [ $? -eq $OCF_NOT_RUNNING ]; then
ocf_log debug "not exported"
return $OCF_SUCCESS
fi
ocf_log info "Un-exporting file system ..."
# Backup the rmtab to ensure smooth NFS-over-TCP failover
if [ ${OCF_RESKEY_rmtab_backup} != "none" ]; then
forall backup_rmtab
fi
forall unexport_one
rc=$?
if ocf_is_true ${OCF_RESKEY_unlock_on_stop}; then
forall unlock_fs
fi
if ocf_is_true ${OCF_RESKEY_wait_for_leasetime_on_stop}; then
wait_for_leasetime
fi
if [ $rc -eq 0 ]; then
cleanup_export_cache
ocf_log info "Un-exported file system(s)"
return $OCF_SUCCESS
else
ocf_exit_reason "Failed to un-export file system(s)"
return $OCF_ERR_GENERIC
fi
}
testdir() {
if [ ! -d $1 ]; then
ocf_is_probe ||
ocf_log err "$1 does not exist or is not a directory"
return 1
fi
return 0
}
exportfs_validate_all ()
{
if [ `echo "$OCF_RESKEY_directory" | wc -w` -gt 1 ] &&
! ocf_is_decimal "$OCF_RESKEY_fsid"; then
ocf_exit_reason "use integer fsid when exporting multiple directories"
return $OCF_ERR_CONFIGURED
fi
if ! forall testdir; then
return $OCF_ERR_INSTALLED
fi
}
# If someone puts a trailing slash at the end of the export directory,
# this agent is going to fail in some unexpected ways due to how
# export strings are matched. The simplest solution here is to strip off
# a trailing '/' in the directory before processing anything.
newdir=$(echo "$OCF_RESKEY_directory" | sed -n -e 's/^\(.*\)\/$/\1/p')
if [ -n "$newdir" ]; then
OCF_RESKEY_directory=$newdir
fi
OCF_REQUIRED_PARAMS="directory fsid clientspec"
OCF_REQUIRED_BINARIES="exportfs"
ocf_rarun $*
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Mon, Dec 23, 12:39 PM (1 d, 13 h)
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