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qemu-ga: sample fsfreeze hooks
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 <tomoki.sekiyama.qu@hitachi.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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1
.gitignore
vendored
1
.gitignore
vendored
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@ -70,6 +70,7 @@ fsdev/virtfs-proxy-helper.pod
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*.tp
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*.tp
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*.vr
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*.vr
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*.d
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*.d
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!scripts/qemu-guest-agent/fsfreeze-hook.d
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*.o
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*.o
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*.lo
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*.lo
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*.la
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*.la
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2
Makefile
2
Makefile
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@ -232,7 +232,7 @@ clean:
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# avoid old build problems by removing potentially incorrect old files
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# avoid old build problems by removing potentially incorrect old files
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rm -f config.mak op-i386.h opc-i386.h gen-op-i386.h op-arm.h opc-arm.h gen-op-arm.h
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rm -f config.mak op-i386.h opc-i386.h gen-op-i386.h op-arm.h opc-arm.h gen-op-arm.h
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rm -f qemu-options.def
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rm -f qemu-options.def
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find . -name '*.[od]' -exec rm -f {} +
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find . -name '*.[od]' -type f -exec rm -f {} +
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rm -f *.a *.lo $(TOOLS) $(HELPERS-y) qemu-ga TAGS cscope.* *.pod *~ */*~
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rm -f *.a *.lo $(TOOLS) $(HELPERS-y) qemu-ga TAGS cscope.* *.pod *~ */*~
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rm -Rf .libs
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rm -Rf .libs
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rm -f qemu-img-cmds.h
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rm -f qemu-img-cmds.h
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33
scripts/qemu-guest-agent/fsfreeze-hook
Executable file
33
scripts/qemu-guest-agent/fsfreeze-hook
Executable file
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@ -0,0 +1,33 @@
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#!/bin/sh
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# This script is executed when a guest agent receives fsfreeze-freeze and
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# fsfreeze-thaw command, if it is specified in --fsfreeze-hook (-F)
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# option of qemu-ga or placed in default path (/etc/qemu/fsfreeze-hook).
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# When the agent receives fsfreeze-freeze request, this script is issued with
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# "freeze" argument before the filesystem is frozen. And for fsfreeze-thaw
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# request, it is issued with "thaw" argument after filesystem is thawed.
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LOGFILE=/var/log/qga-fsfreeze-hook.log
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FSFREEZE_D=$(dirname -- "$0")/fsfreeze-hook.d
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# Check whether file $1 is a backup or rpm-generated file and should be ignored
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is_ignored_file() {
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case "$1" in
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*~ | *.bak | *.orig | *.rpmnew | *.rpmorig | *.rpmsave | *.sample)
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return 0 ;;
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esac
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return 1
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}
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# Iterate executables in directory "fsfreeze-hook.d" with the specified args
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[ ! -d "$FSFREEZE_D" ] && exit 0
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for file in "$FSFREEZE_D"/* ; do
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is_ignored_file "$file" && continue
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[ -x "$file" ] || continue
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printf "$(date): execute $file $@\n" >>$LOGFILE
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"$file" "$@" >>$LOGFILE 2>&1
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STATUS=$?
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printf "$(date): $file finished with status=$STATUS\n" >>$LOGFILE
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done
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exit 0
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56
scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample
Executable file
56
scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample
Executable file
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@ -0,0 +1,56 @@
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#!/bin/sh
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# Flush MySQL tables to the disk before the filesystem is frozen.
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# At the same time, this keeps a read lock in order to avoid write accesses
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# from the other clients until the filesystem is thawed.
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MYSQL="/usr/bin/mysql"
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MYSQL_OPTS="-uroot" #"-prootpassword"
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FIFO=/var/run/mysql-flush.fifo
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# Check mysql is installed and the server running
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[ -x "$MYSQL" ] && "$MYSQL" $MYSQL_OPTS < /dev/null || exit 0
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flush_and_wait() {
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printf "FLUSH TABLES WITH READ LOCK \\G\n"
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trap 'printf "$(date): $0 is killed\n">&2' HUP INT QUIT ALRM TERM
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read < $FIFO
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printf "UNLOCK TABLES \\G\n"
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rm -f $FIFO
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}
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case "$1" in
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freeze)
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mkfifo $FIFO || exit 1
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flush_and_wait | "$MYSQL" $MYSQL_OPTS &
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# wait until every block is flushed
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while [ "$(echo 'SHOW STATUS LIKE "Key_blocks_not_flushed"' |\
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"$MYSQL" $MYSQL_OPTS | tail -1 | cut -f 2)" -gt 0 ]; do
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sleep 1
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done
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# for InnoDB, wait until every log is flushed
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INNODB_STATUS=$(mktemp /tmp/mysql-flush.XXXXXX)
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[ $? -ne 0 ] && exit 2
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trap "rm -f $INNODB_STATUS; exit 1" HUP INT QUIT ALRM TERM
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while :; do
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printf "SHOW ENGINE INNODB STATUS \\G" |\
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"$MYSQL" $MYSQL_OPTS > $INNODB_STATUS
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LOG_CURRENT=$(grep 'Log sequence number' $INNODB_STATUS |\
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tr -s ' ' | cut -d' ' -f4)
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LOG_FLUSHED=$(grep 'Log flushed up to' $INNODB_STATUS |\
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tr -s ' ' | cut -d' ' -f5)
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[ "$LOG_CURRENT" = "$LOG_FLUSHED" ] && break
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sleep 1
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done
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rm -f $INNODB_STATUS
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;;
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thaw)
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[ ! -p $FIFO ] && exit 1
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echo > $FIFO
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;;
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*)
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exit 1
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;;
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esac
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