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samba-mirror/ctdb/config/events/legacy/60.nfs.script

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#!/bin/sh
# script to manage nfs in a clustered environment
[ -n "$CTDB_BASE" ] || \
CTDB_BASE=$(d=$(dirname "$0") ; cd -P "$d" ; dirname "$PWD")
. "${CTDB_BASE}/functions"
service_name="nfs"
load_system_config "nfs"
load_script_options
ctdb_setup_state_dir "service" "$service_name"
######################################################################
service_reconfigure ()
{
# Restart lock manager, notify clients
if [ -x "${CTDB_BASE}/statd-callout" ] ; then
"${CTDB_BASE}/statd-callout" notify &
fi >/dev/null 2>&1
}
######################################################################
######################################################
# Check the health of NFS services
#
# Use .check files in $CTDB_NFS_CHECKS_DIR.
# Default is "${CTDB_BASE}/nfs-checks.d/"
######################################################
nfs_check_services ()
{
_dir="${CTDB_NFS_CHECKS_DIR:-${CTDB_BASE}/nfs-checks.d}"
# Files must end with .check - avoids editor backups, RPM fu, ...
for _f in "$_dir"/[0-9][0-9].*.check ; do
[ -r "$_f" ] || continue
_t="${_f%.check}"
_progname="${_t##*/[0-9][0-9].}"
nfs_check_service "$_progname" <"$_f"
done
}
######################################################
# Check the health of an NFS service
#
# $1 - progname, passed to rpcinfo (looked up in /etc/rpc)
#
# Reads variables from stdin
#
# Variables are:
#
# * family - "tcp" or "udp" or space separated list
# default: tcp, not used with "service_check_cmd"
# * version - optional, RPC service version number
# default is to omit to check for any version,
# not used with "service_check_cmd"
# * unhealthy_after - number of check fails before unhealthy
# default: 1
# * restart_every - number of check fails before restart
# default: 0, meaning no restart
# * service_stop_cmd - command to stop service
# default: no default, must be provided if
# restart_every > 0
# * service_start_cmd - command to start service
# default: no default, must be provided if
# restart_every > 0
# * service_check_cmd - command to check health of service
# default is to check RPC service using rpcinfo
# * service_debug_cmd - command to debug a service after trying to stop it;
# for example, it can be useful to print stack
# traces of threads that have not exited, since
# they may be stuck doing I/O;
# no default, see also function program_stack_traces()
#
# Quoting in values is not preserved
#
######################################################
nfs_check_service ()
{
_progname="$1"
# This sub-shell is created to intentionally limit the scope of
# variable values read from the .check files.
# shellcheck disable=SC2030
(
# Subshell to restrict scope variables...
# Defaults
family="tcp"
version=""
unhealthy_after=1
restart_every=0
service_stop_cmd=""
service_start_cmd=""
service_check_cmd=""
service_debug_cmd=""
# Eval line-by-line. Expands variable references in values.
# Also allows variable name checking, which seems useful.
while read _line ; do
case "$_line" in
\#*|"") : ;; # Ignore comments, blank lines
family=*|version=*|\
unhealthy_after=*|restart_every=*|\
service_stop_cmd=*|service_start_cmd=*|\
service_check_cmd=*|service_debug_cmd=*)
eval "$_line"
;;
*)
echo "ERROR: Unknown variable for ${_progname}: ${_line}"
exit 1
esac
done
_ok=false
if [ -n "$service_check_cmd" ] ; then
# Using eval means variables can contain semicolon separated commands
if eval "$service_check_cmd" ; then
_ok=true
else
_err="monitoring service \"${_progname}\" failed"
fi
else
if nfs_check_rpcinfo \
"$_progname" "$version" "$family" >/dev/null ; then
_ok=true
else
_err="$ctdb_check_rpc_out"
fi
fi
if $_ok ; then
if [ $unhealthy_after -ne 1 ] || [ $restart_every -ne 0 ] ; then
ctdb_counter_init "$_progname"
fi
exit 0
fi
ctdb_counter_incr "$_progname"
_failcount=$(ctdb_counter_get "$_progname")
_unhealthy=false
if [ "$unhealthy_after" -gt 0 ] ; then
if [ "$_failcount" -ge "$unhealthy_after" ] ; then
_unhealthy=true
echo "ERROR: $_err"
fi
fi
if [ "$restart_every" -gt 0 ] ; then
if [ $((_failcount % restart_every)) -eq 0 ] ; then
if ! $_unhealthy ; then
echo "WARNING: $_err"
fi
nfs_restart_service
fi
fi
if $_unhealthy ; then
exit 1
fi
return 0
) || exit 1
}
# Uses: service_stop_cmd, service_start_cmd, service_debug_cmd
# This function is called within the sub-shell that shellcheck thinks
# loses the above variable values.
# shellcheck disable=SC2031
nfs_restart_service ()
{
if [ -z "$service_stop_cmd" ] || [ -z "$service_start_cmd" ] ; then
die "ERROR: Can not restart service \"${_progname}\" without corresponding service_start_cmd/service_stop_cmd settings"
fi
echo "Trying to restart service \"${_progname}\"..."
# Using eval means variables can contain semicolon separated commands
eval "$service_stop_cmd"
if [ -n "$service_debug_cmd" ] ; then
eval "$service_debug_cmd"
fi
background_with_logging eval "$service_start_cmd"
}
######################################################
# Check an RPC service with rpcinfo
######################################################
ctdb_check_rpc ()
{
_progname="$1" # passed to rpcinfo (looked up in /etc/rpc)
_version="$2" # optional, not passed if empty/unset
_family="${3:-tcp}" # optional, default is "tcp"
case "$_family" in
tcp6|udp6)
_localhost="${CTDB_RPCINFO_LOCALHOST6:-::1}"
;;
*)
_localhost="${CTDB_RPCINFO_LOCALHOST:-127.0.0.1}"
esac
# $_version is not quoted because it is optional
# shellcheck disable=SC2086
if ! ctdb_check_rpc_out=$(rpcinfo -T "$_family" "$_localhost" \
"$_progname" $_version 2>&1) ; then
ctdb_check_rpc_out="$_progname failed RPC check:
$ctdb_check_rpc_out"
echo "$ctdb_check_rpc_out"
return 1
fi
}
nfs_check_rpcinfo ()
{
_progname="$1" # passed to rpcinfo (looked up in /etc/rpc)
_versions="$2" # optional, space separated, not passed if empty/unset
_families="${3:-tcp}" # optional, space separated, default is "tcp"
for _family in $_families ; do
if [ -n "$_versions" ] ; then
for _version in $_versions ; do
ctdb_check_rpc "$_progname" "$_version" "$_family" || return $?
done
else
ctdb_check_rpc "$_progname" "" "$_family" || return $?
fi
done
}
##################################################################
# use statd-callout to update NFS lock info
##################################################################
nfs_update_lock_info ()
{
if [ -x "$CTDB_BASE/statd-callout" ] ; then
"$CTDB_BASE/statd-callout" update
fi
}
######################################################################
# script_state_dir set by ctdb_setup_state_dir()
# shellcheck disable=SC2154
nfs_callout_init "$script_state_dir"
case "$1" in
startup)
nfs_callout "$@" || exit $?
;;
shutdown)
nfs_callout "$@" || exit $?
;;
takeip)
nfs_callout "$@" || exit $?
ctdb_service_set_reconfigure
;;
releaseip)
nfs_callout "$@" || exit $?
ctdb_service_set_reconfigure
;;
ipreallocated)
if ctdb_service_needs_reconfigure ; then
ctdb_service_reconfigure
fi
;;
monitor)
nfs_callout "monitor-pre" || exit $?
# Check that directories for shares actually exist
if [ "$CTDB_NFS_SKIP_SHARE_CHECK" != "yes" ] ; then
nfs_callout "monitor-list-shares" | ctdb_check_directories || \
exit $?
fi
update_tickles 2049
nfs_update_lock_info
nfs_check_services
nfs_callout "monitor-post" || exit $?
;;
esac
exit 0