From b2a6f28d46296b165de140d047e51c6ae8060124 Mon Sep 17 00:00:00 2001 Message-Id: In-Reply-To: <707b9b97153063374d2530e72c49b1499fc21af9.1367947969.git.minovotn@redhat.com> References: <707b9b97153063374d2530e72c49b1499fc21af9.1367947969.git.minovotn@redhat.com> From: Laszlo Ersek Date: Mon, 6 May 2013 19:27:50 +0200 Subject: [PATCH 085/114] qemu-ga: sample fsfreeze hooks RH-Author: Laszlo Ersek Message-id: <1367868499-27603-28-git-send-email-lersek@redhat.com> Patchwork-id: 51126 O-Subject: [RHEL-6.5 qemu-kvm PATCH v2 27/56] qemu-ga: sample fsfreeze hooks Bugzilla: 952873 RH-Acked-by: Jeffrey Cody RH-Acked-by: Gerd Hoffmann RH-Acked-by: Paolo Bonzini Adds sample hook scripts for --fsfreeze-hook option of qemu-ga. - fsfreeze-hook : execute scripts in fsfreeze-hook.d/ - fsfreeze-hook.d/mysql-flush.sh.sample : quiesce MySQL before snapshot Signed-off-by: Tomoki Sekiyama Reviewed-by: Michael Roth Signed-off-by: Michael Roth (cherry picked from commit 96610da210697a1f33669d8bec0cb7b944d3a516) Conflicts: Makefile RHEL-6 notes: - The RHEL-6 Makefile doesn't use "find" to clean up build files, so we don't have to patch it. - Although this patch completes the backports needed for RHBZ#911569, it doesn't solve the RHBZ. For that the following RH packaging changes are necessary, minimally: - installing the hook script as /usr/libexec/qemu-ga-fsfreeze-hook, - adapting the same to the RHEL-6 filesystem hierarchy, - installing the sample mysql script as /usr/share/qemu-ga/fsfreeze-hook.d/mysql-flush.sh.sample, - introducing FSFREEZE_HOOK_ENABLE=[01] and FSFREEZE_HOOK_PATHNAME="..." in "redhat/qemu-ga.sysconfig", - based on the former, "redhat/qemu-ga.init" must pass "--fsfreeze-hook" at daemon startup. These will be researched & implemented in RHBZ#911569 separately. Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=911569 Signed-off-by: Laszlo Ersek --- .gitignore | 1 + scripts/qemu-guest-agent/fsfreeze-hook | 33 ++++++++++++ .../fsfreeze-hook.d/mysql-flush.sh.sample | 56 ++++++++++++++++++++ 3 files changed, 90 insertions(+), 0 deletions(-) create mode 100755 scripts/qemu-guest-agent/fsfreeze-hook create mode 100755 scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample Signed-off-by: Michal Novotny --- .gitignore | 1 + scripts/qemu-guest-agent/fsfreeze-hook | 33 +++++++++++++ .../fsfreeze-hook.d/mysql-flush.sh.sample | 56 ++++++++++++++++++++++ 3 files changed, 90 insertions(+) create mode 100755 scripts/qemu-guest-agent/fsfreeze-hook create mode 100755 scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample diff --git a/.gitignore b/.gitignore index 4c7f3b6..07868ca 100644 --- a/.gitignore +++ b/.gitignore @@ -48,6 +48,7 @@ qemu-monitor.texi *.tp *.vr *.d +!scripts/qemu-guest-agent/fsfreeze-hook.d *.o *.swp *.orig diff --git a/scripts/qemu-guest-agent/fsfreeze-hook b/scripts/qemu-guest-agent/fsfreeze-hook new file mode 100755 index 0000000..c27b29f --- /dev/null +++ b/scripts/qemu-guest-agent/fsfreeze-hook @@ -0,0 +1,33 @@ +#!/bin/sh + +# This script is executed when a guest agent receives fsfreeze-freeze and +# fsfreeze-thaw command, if it is specified in --fsfreeze-hook (-F) +# option of qemu-ga or placed in default path (/etc/qemu/fsfreeze-hook). +# When the agent receives fsfreeze-freeze request, this script is issued with +# "freeze" argument before the filesystem is frozen. And for fsfreeze-thaw +# request, it is issued with "thaw" argument after filesystem is thawed. + +LOGFILE=/var/log/qemu-ga/fsfreeze-hook.log +FSFREEZE_D=$(dirname -- "$0")/fsfreeze-hook.d + +# Check whether file $1 is a backup or rpm-generated file and should be ignored +is_ignored_file() { + case "$1" in + *~ | *.bak | *.orig | *.rpmnew | *.rpmorig | *.rpmsave | *.sample) + return 0 ;; + esac + return 1 +} + +# Iterate executables in directory "fsfreeze-hook.d" with the specified args +[ ! -d "$FSFREEZE_D" ] && exit 0 +for file in "$FSFREEZE_D"/* ; do + is_ignored_file "$file" && continue + [ -x "$file" ] || continue + printf "$(date): execute $file $@\n" >>$LOGFILE + "$file" "$@" >>$LOGFILE 2>&1 + STATUS=$? + printf "$(date): $file finished with status=$STATUS\n" >>$LOGFILE +done + +exit 0 diff --git a/scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample b/scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample new file mode 100755 index 0000000..2b4fa3a --- /dev/null +++ b/scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample @@ -0,0 +1,56 @@ +#!/bin/sh + +# Flush MySQL tables to the disk before the filesystem is frozen. +# At the same time, this keeps a read lock in order to avoid write accesses +# from the other clients until the filesystem is thawed. + +MYSQL="/usr/bin/mysql" +MYSQL_OPTS="-uroot" #"-prootpassword" +FIFO=/var/run/mysql-flush.fifo + +# Check mysql is installed and the server running +[ -x "$MYSQL" ] && "$MYSQL" $MYSQL_OPTS < /dev/null || exit 0 + +flush_and_wait() { + printf "FLUSH TABLES WITH READ LOCK \\G\n" + trap 'printf "$(date): $0 is killed\n">&2' HUP INT QUIT ALRM TERM + read < $FIFO + printf "UNLOCK TABLES \\G\n" + rm -f $FIFO +} + +case "$1" in + freeze) + mkfifo $FIFO || exit 1 + flush_and_wait | "$MYSQL" $MYSQL_OPTS & + # wait until every block is flushed + while [ "$(echo 'SHOW STATUS LIKE "Key_blocks_not_flushed"' |\ + "$MYSQL" $MYSQL_OPTS | tail -1 | cut -f 2)" -gt 0 ]; do + sleep 1 + done + # for InnoDB, wait until every log is flushed + INNODB_STATUS=$(mktemp /tmp/mysql-flush.XXXXXX) + [ $? -ne 0 ] && exit 2 + trap "rm -f $INNODB_STATUS; exit 1" HUP INT QUIT ALRM TERM + while :; do + printf "SHOW ENGINE INNODB STATUS \\G" |\ + "$MYSQL" $MYSQL_OPTS > $INNODB_STATUS + LOG_CURRENT=$(grep 'Log sequence number' $INNODB_STATUS |\ + tr -s ' ' | cut -d' ' -f4) + LOG_FLUSHED=$(grep 'Log flushed up to' $INNODB_STATUS |\ + tr -s ' ' | cut -d' ' -f5) + [ "$LOG_CURRENT" = "$LOG_FLUSHED" ] && break + sleep 1 + done + rm -f $INNODB_STATUS + ;; + + thaw) + [ ! -p $FIFO ] && exit 1 + echo > $FIFO + ;; + + *) + exit 1 + ;; +esac -- 1.7.11.7