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c315fce17e
Reviewed-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Michael Adam <obnox@samba.org> Autobuild-User(master): Andrew Bartlett <abartlet@samba.org> Autobuild-Date(master): Fri Nov 6 13:43:45 CET 2015 on sn-devel-104
210 lines
7.3 KiB
Plaintext
Executable File
210 lines
7.3 KiB
Plaintext
Executable File
#!/bin/sh
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# This must run as root as CTDB tool commands need to access CTDB socket
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[ $(id -u) -eq 0 ] || exec sudo "$0" "$@"
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# this script needs to be installed so that statd points to it with the -H
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# command line argument. The easiest way to do that is to put something like this in
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# /etc/sysconfig/nfs:
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# STATD_HOSTNAME="myhostname -H /etc/ctdb/statd-callout"
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[ -n "$CTDB_BASE" ] || \
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export CTDB_BASE=$(cd -P $(dirname "$0") ; echo "$PWD")
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. $CTDB_BASE/functions
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# Overwrite this so we get some logging
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die ()
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{
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script_log "statd-callout" "$@"
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exit 1
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}
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loadconfig ctdb
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loadconfig nfs
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[ -n "$NFS_HOSTNAME" ] || \
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die "NFS_HOSTNAME is not configured. statd-callout failed"
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# A handy newline
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nl="
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"
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ctdb_setup_service_state_dir "statd-callout"
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cd "$service_state_dir" || \
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die "Failed to change directory to \"${service_state_dir}\""
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case "$1" in
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# Keep a single file to keep track of the last "add-client" or
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# "del-client'. These get pushed to ctdb.tdb during "update",
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# which will generally be run once each "monitor" cycle. In this
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# way we avoid scalability problems with flood of persistent
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# transactions after a "notify" when all the clients re-take their
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# locks.
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add-client)
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# statd does not tell us to which IP the client connected so
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# we must add it to all the IPs that we serve
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cip="$2"
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ctdb_get_pnn
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date=$(date '+%s')
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ctdb ip -X |
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tail -n +2 |
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while IFS="|" read x sip node x ; do
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[ "$node" = "$pnn" ] || continue # not us
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key="statd-state@${sip}@${cip}"
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echo "\"${key}\" \"${date}\"" >"$key"
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done
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;;
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del-client)
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# statd does not tell us from which IP the client disconnected
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# so we must add it to all the IPs that we serve
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cip="$2"
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ctdb_get_pnn
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ctdb ip -X |
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tail -n +2 |
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while IFS="|" read x sip node x ; do
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[ "$node" = "$pnn" ] || continue # not us
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key="statd-state@${sip}@${cip}"
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echo "\"${key}\" \"\"" >"$key"
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done
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;;
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update)
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files=$(echo statd-state@*)
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if [ "$files" = "statd-state@*" ] ; then
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# No files!
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exit 0
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fi
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# Filter out lines for any IP addresses that are not currently
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# hosted public IP addresses.
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ctdb_get_pnn
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ctdb_ips=$(ctdb ip | tail -n +2)
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sed_expr=$(echo "$ctdb_ips" |
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awk -v pnn=$pnn 'pnn == $2 { \
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ip = $1; gsub(/\./, "\\.", ip); \
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printf "/statd-state@%s@/p\n", ip }')
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if cat $files | sed -n "$sed_expr" | ctdb ptrans "ctdb.tdb" ; then
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rm $files
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fi
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;;
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notify)
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# we must restart the lockmanager (on all nodes) so that we get
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# a clusterwide grace period (so other clients don't take out
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# conflicting locks through other nodes before all locks have been
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# reclaimed)
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# we need these settings to make sure that no tcp connections survive
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# across a very fast failover/failback
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#echo 10 > /proc/sys/net/ipv4/tcp_fin_timeout
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#echo 0 > /proc/sys/net/ipv4/tcp_max_tw_buckets
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#echo 0 > /proc/sys/net/ipv4/tcp_max_orphans
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# Delete the notification list for statd, we don't want it to
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# ping any clients
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rm -f /var/lib/nfs/statd/sm/*
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rm -f /var/lib/nfs/statd/sm.bak/*
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# we must keep a monotonically increasing state variable for the entire
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# cluster so state always increases when ip addresses fail from one
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# node to another
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# We use epoch and hope the nodes are close enough in clock.
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# Even numbers mean service is shut down, odd numbers mean
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# service is started.
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state_even=$(( $(date '+%s') / 2 * 2))
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# We must also let some time pass between stopping and
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# restarting the lock manager. Otherwise there is a window
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# where the lock manager will respond "strangely" immediately
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# after restarting it, which causes clients to fail to reclaim
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# their locks.
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"$CTDB_NFS_CALLOUT" "stop" "nlockmgr" >/dev/null 2>&1
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sleep 2
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"$CTDB_NFS_CALLOUT" "start" "nlockmgr" >/dev/null 2>&1
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# we now need to send out additional statd notifications to ensure
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# that clients understand that the lockmanager has restarted.
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# we have three cases:
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# 1, clients that ignore the ip address the stat notification came from
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# and ONLY care about the 'name' in the notify packet.
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# these clients ONLY work with lock failover IFF that name
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# can be resolved into an ipaddress that matches the one used
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# to mount the share. (==linux clients)
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# This is handled when starting lockmanager above, but those
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# packets are sent from the "wrong" ip address, something linux
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# clients are ok with, buth other clients will barf at.
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# 2, Some clients only accept statd packets IFF they come from the
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# 'correct' ip address.
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# 2a,Send out the notification using the 'correct' ip address and also
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# specify the 'correct' hostname in the statd packet.
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# Some clients require both the correct source address and also the
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# correct name. (these clients also ONLY work if the ip addresses
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# used to map the share can be resolved into the name returned in
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# the notify packet.)
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# 2b,Other clients require that the source ip address of the notify
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# packet matches the ip address used to take out the lock.
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# I.e. that the correct source address is used.
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# These clients also require that the statd notify packet contains
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# the name as the ip address used when the lock was taken out.
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#
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# Both 2a and 2b are commonly used in lockmanagers since they maximize
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# probability that the client will accept the statd notify packet and
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# not just ignore it.
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# For all IPs we serve, collect info and push to the config database
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ctdb_get_pnn
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# Construct a sed expression to take catdb output and produce pairs of:
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# server-IP client-IP
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# but only for the server-IPs that are hosted on this node.
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ctdb_all_ips=$(ctdb ip all | tail -n +2)
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sed_expr=$(echo "$ctdb_all_ips" |
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awk -v pnn=$pnn 'pnn == $2 { \
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ip = $1; gsub(/\./, "\\.", ip); \
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printf "s/^key.*=.*statd-state@\\(%s\\)@\\([^\"]*\\).*/\\1 \\2/p\n", ip }')
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statd_state=$(ctdb catdb ctdb.tdb | sed -n "$sed_expr" | sort)
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[ -n "$statd_state" ] || exit 0
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prev=""
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echo "$statd_state" | {
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# This all needs to be in the same command group at the
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# end of the pipe so it doesn't get lost when the loop
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# completes.
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items=""
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while read sip cip ; do
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# Collect item to delete from the DB
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key="statd-state@${sip}@${cip}"
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item="\"${key}\" \"\""
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items="${items}${items:+${nl}}${item}"
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# NOTE: Consider optimising smnotify to read all the
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# data from stdin and then run it in the background.
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# Reset stateval for each serverip
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[ "$sip" = "$prev" ] || stateval="$state_even"
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# Send notifies for server shutdown
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smnotify --client=$cip --ip=$sip --server=$sip --stateval=$stateval
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smnotify --client=$cip --ip=$sip --server=$NFS_HOSTNAME --stateval=$stateval
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# Send notifies for server startup
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stateval=$(($stateval + 1))
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smnotify --client=$cip --ip=$sip --server=$sip --stateval=$stateval
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smnotify --client=$cip --ip=$sip --server=$NFS_HOSTNAME --stateval=$stateval
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done
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echo "$items" | ctdb ptrans "ctdb.tdb"
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}
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# Remove any stale touch files (i.e. for IPs not currently
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# hosted on this node and created since the last "update").
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# There's nothing else we can do with them at this stage.
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echo "$ctdb_all_ips" |
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awk -v pnn=$pnn 'pnn != $2 { print $1 }' |
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while read sip ; do
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rm -f "statd-state@${sip}@"*
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done
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;;
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esac
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