ctdb/config/nfs-linux-kernel-callout

   1 #!/bin/sh
   2
   3 # Exit on 1st error
   4 set -e
   5
   6 # NFS exports file.  Some code below keeps a cache of output derived
   7 # from exportfs(8).  When this file is updated the cache is invalid
   8 # and needs to be regenerated.
   9 #
  10 # To change the file, edit the default value below.  Do not set
  11 # CTDB_NFS_EXPORTS_FILE - it isn't a configuration variable, just a
  12 # hook for testing.
  13 nfs_exports_file="${CTDB_NFS_EXPORTS_FILE:-/var/lib/nfs/etab}"
  14
  15 # Red Hat
  16 nfs_service="nfs"
  17 nfslock_service="nfslock"
  18 nfs_config="/etc/sysconfig/nfs"
  19
  20 # SUSE
  21 #nfs_service="nfsserver"
  22 #nfslock_service=""
  23 #nfs_config="/etc/sysconfig/nfs"
  24
  25 # Debian
  26 #nfs_service="nfs-kernel-server"
  27 #nfslock_service=""
  28 #nfs_config="/etc/default/nfs-kernel-server"
  29
  30 # Override for unit testing
  31 if [ -z "$PROCFS_PATH" ] ; then
  32     PROCFS_PATH="/proc"
  33 fi
  34
  35 ##################################################
  36
  37 usage ()
  38 {
  39     _c=$(basename "$0")
  40     cat <<EOF
  41 usage: $_c { shutdown | startup }
  42        $_c { stop | start } { nfs | nlockmgr }
  43        $_c { monitor-list-shares | monitor-post }
  44        $_c { register }
  45 EOF
  46     exit 1
  47 }
  48
  49
  50 ##################################################
  51 # Basic service stop and start
  52
  53 basic_stop ()
  54 {
  55     case "$1" in
  56         nfs)
  57             service "$nfs_service" stop
  58             if [ -n "$nfslock_service" ] ; then
  59                 service "$nfslock_service" stop
  60             fi
  61             ;;
  62         nfslock)
  63             if [ -n "$nfslock_service" ] ; then
  64                 service "$nfslock_service" stop
  65             else
  66                 service "$nfs_service" stop
  67             fi
  68             ;;
  69         *)
  70             usage
  71     esac
  72 }
  73
  74 basic_start ()
  75 {
  76     case "$1" in
  77         nfs)
  78             if [ -n "$nfslock_service" ] ; then
  79                 service "$nfslock_service" start
  80             fi
  81             service "$nfs_service" start
  82             ;;
  83         nfslock)
  84             if [ -n "$nfslock_service" ] ; then
  85                 service "$nfslock_service" start
  86             else
  87                 service "$nfs_service" start
  88             fi
  89             ;;
  90         *)
  91             usage
  92     esac
  93 }
  94
  95 ##################################################
  96 # service "stop" and "start" options for restarting
  97
  98 service_stop ()
  99 {
 100     case "$1" in
 101         nfs)
 102             echo 0 >"${PROCFS_PATH}/fs/nfsd/threads"
 103             basic_stop "nfs" >/dev/null 2>&1 || true
 104             pkill -9 nfsd
 105             ;;
 106         nlockmgr)
 107             basic_stop "nfslock" >/dev/null 2>&1 || true
 108             ;;
 109         *)
 110             usage
 111     esac
 112 }
 113
 114 service_start ()
 115 {
 116     case "$1" in
 117         nfs)
 118             basic_start "nfs"
 119             ;;
 120         nlockmgr)
 121             basic_start "nfslock"
 122             ;;
 123         *)
 124             usage
 125     esac
 126 }
 127
 128 ##################################################
 129 # service init startup and final shutdown
 130
 131 nfs_shutdown ()
 132 {
 133     basic_stop "nfs"
 134 }
 135
 136 nfs_startup ()
 137 {
 138     basic_stop "nfs" || true
 139     basic_start "nfs"
 140     _f="${PROCFS_PATH}/sys/net/ipv4/tcp_tw_recycle"
 141     if [ "$_f" ] ; then
 142         echo 1 >"$_f"
 143     fi
 144 }
 145
 146 ##################################################
 147 # monitor-post support
 148
 149 nfs_check_thread_count ()
 150 {
 151     # Load NFS configuration to get desired number of threads.
 152     if [ -r "$nfs_config" ] ; then
 153         . "$nfs_config"
 154     fi
 155
 156     # If $RPCNFSDCOUNT/$USE_KERNEL_NFSD_NUMBER isn't set then we could
 157     # guess the default from the initscript.  However, let's just
 158     # assume that those using the default don't care about the number
 159     # of threads and that they have switched on this feature in error.
 160     _configured_threads="${RPCNFSDCOUNT:-${USE_KERNEL_NFSD_NUMBER}}"
 161     [ -n "$_configured_threads" ] || return 0
 162
 163     _threads_file="${PROCFS_PATH}/fs/nfsd/threads"
 164
 165     # nfsd should be running the configured number of threads.  If
 166     # there are a different number of threads then tell nfsd the
 167     # correct number.
 168     read _running_threads <"$_threads_file" || {
 169             echo "WARNING: Reading \"${_threads_file}\" unexpectedly failed"
 170             exit 0
 171     }
 172
 173     # Intentionally not arithmetic comparison - avoids extra errors
 174     # when above read fails in an unexpected way...
 175     if [ "$_running_threads" != "$_configured_threads" ] ; then
 176         echo "Attempting to correct number of nfsd threads from ${_running_threads} to ${_configured_threads}"
 177         echo "$_configured_threads" >"$_threads_file"
 178     fi
 179 }
 180
 181 ##################################################
 182 # list share directories
 183
 184 nfs_monitor_list_shares ()
 185 {
 186     _cache_file="${CTDB_NFS_CALLOUT_STATE_DIR}/list_shares_cache"
 187     # -nt operator is well supported in Linux: dash, bash, ksh, ...
 188     # shellcheck disable=SC2039
 189     if  [ ! -r "$nfs_exports_file" ] || [ ! -r "$_cache_file" ] || \
 190             [ "$nfs_exports_file" -nt "$_cache_file" ] ; then
 191         mkdir -p "$CTDB_NFS_CALLOUT_STATE_DIR"
 192         # We could just use the contents of $nfs_exports_file.
 193         # However, let's regard that file as internal to NFS and use
 194         # exportfs, which is the public API.
 195         if ! _exports=$(exportfs -v) ; then
 196             echo "WARNING: failed to run exportfs to list NFS shares" >&2
 197             return
 198         fi
 199
 200         echo "$_exports" |
 201             grep '^/' |
 202             sed -e 's@[[:space:]][[:space:]]*[^[:space:]()][^[:space:]()]*([^[:space:]()][^[:space:]()]*)$@@' |
 203             sort -u >"$_cache_file"
 204     fi
 205
 206     cat "$_cache_file"
 207 }
 208
 209 ##################################################
 210
 211 nfs_register ()
 212 {
 213     cat <<EOF
 214 shutdown
 215 startup
 216 stop
 217 start
 218 monitor-list-shares
 219 monitor-post
 220 EOF
 221 }
 222
 223 ##################################################
 224
 225 case "$1" in
 226     shutdown)
 227         nfs_shutdown
 228         ;;
 229     startup)
 230         nfs_startup
 231         ;;
 232     stop)
 233         service_stop "$2"
 234         ;;
 235     start)
 236         service_start "$2"
 237         ;;
 238     monitor-list-shares)
 239         nfs_monitor_list_shares
 240         ;;
 241     monitor-post)
 242         nfs_check_thread_count
 243         ;;
 244     register)
 245         nfs_register
 246         ;;
 247     monitor-pre|releaseip|takeip|releaseip-pre|takeip-pre)
 248         # Not required/implemented
 249         :
 250         ;;
 251     *)
 252         usage
 253 esac