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authormail_redacted_for_web 2019-04-17 19:07:19 +0200
committermail_redacted_for_web 2019-04-17 19:07:19 +0200
commit1e2387474a449452b78520b9ad96a8b4b5e99722 (patch)
tree836889471eec7d2aac177405068e2a8f1e2b1978 /nagios-plugins-contrib-24.20190301~bpo9+1/percona-nagios-plugins/nagios/bin/pmp-check-mysql-deleted-files
downloadnagios-plugins-contrib-1e2387474a449452b78520b9ad96a8b4b5e99722.tar.bz2
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@@ -0,0 +1,286 @@
+#!/bin/sh
+
+# ########################################################################
+# This program is part of $PROJECT_NAME$
+# License: GPL License (see COPYING)
+# Authors:
+# Baron Schwartz
+# ########################################################################
+
+# ########################################################################
+# Redirect STDERR to STDOUT; Nagios doesn't handle STDERR.
+# ########################################################################
+exec 2>&1
+
+# ########################################################################
+# Set up constants, etc.
+# ########################################################################
+STATE_OK=0
+STATE_WARNING=1
+STATE_CRITICAL=2
+STATE_UNKNOWN=3
+STATE_DEPENDENT=4
+
+# ########################################################################
+# Run the program.
+# ########################################################################
+main() {
+ # Get options
+ for o; do
+ case "${o}" in
+ -c) shift; OPT_CRIT="${1}"; shift; ;;
+ --defaults-file) shift; OPT_DEFT="${1}"; shift; ;;
+ -H) shift; OPT_HOST="${1}"; shift; ;;
+ -l) shift; OPT_USER="${1}"; shift; ;;
+ -L) shift; OPT_LOPA="${1}"; shift; ;;
+ -p) shift; OPT_PASS="${1}"; shift; ;;
+ -P) shift; OPT_PORT="${1}"; shift; ;;
+ -S) shift; OPT_SOCK="${1}"; shift; ;;
+ -t) shift; OPT_TMPDIR="${1}"; shift; ;;
+ -w) shift; OPT_WARN="${1}"; shift; ;;
+ --version) grep -A2 '^=head1 VERSION' "$0" | tail -n1; exit 0 ;;
+ --help) perl -00 -ne 'm/^ Usage:/ && print' "$0"; exit 0 ;;
+ -*) echo "Unknown option ${o}. Try --help."; exit 1; ;;
+ esac
+ done
+ if [ -e '/etc/nagios/mysql.cnf' ]; then
+ OPT_DEFT="${OPT_DEFT:-/etc/nagios/mysql.cnf}"
+ fi
+ if is_not_sourced; then
+ if [ -n "$1" ]; then
+ echo "WARN spurious command-line options: $@"
+ exit 1
+ fi
+ fi
+
+ # If any connection option was given, then try to log in to find the server's
+ # tmpdir.
+ if [ "${OPT_DEFT}${OPT_HOST}${OPT_USER}${OPT_PASS}${OPT_PORT}${OPT_SOCK}" ]; then
+ OPT_TMPDIR=$(mysql_exec "SELECT @@tmpdir") || exit $?
+ elif [ -z "${OPT_TMPDIR}" ]; then
+ OPT_TMPDIR="${TMPDIR:-/tmp/}"
+ fi
+
+ # TODO: We could auto-check every running instance, not just one.
+ local NOTE="OK no deleted files"
+ local PROC_ID=$(_pidof mysqld | head -n1)
+ if [ "${PROC_ID}" ]; then
+ local TEMP=$(mktemp -t "${0##*/}.XXXXXX") || exit $?
+ trap "rm -f '${TEMP}' >/dev/null 2>&1" EXIT
+ if _lsof "${PROC_ID}" > "${TEMP}" ; then
+ # If lsof exists, but you run it as non-root, you'll get a file with a
+ # bunch of this stuff:
+ # mysqld 15287 ... /proc/15287/cwd (readlink: Permission denied)
+ # We have to detect this and return UNK.
+ if grep -v -e denied -e COMMAND "${TEMP}" >/dev/null 2>&1; then
+ local FILES=$(check_deleted_files "${TEMP}" "${OPT_TMPDIR}")
+ NOTE="open but deleted files: ${FILES}"
+ if [ "${FILES}" -a -z "${OPT_WARN}" ]; then
+ NOTE="CRIT $NOTE"
+ elif [ "${FILES}" ]; then
+ NOTE="WARN $NOTE"
+ else
+ NOTE="OK no deleted files"
+ fi
+ else
+ NOTE="UNK You must execute lsof with root privileges"
+ fi
+ else
+ NOTE="UNK could not list MySQL's open files"
+ fi
+ else
+ NOTE="UNK could not find a mysqld process"
+ fi
+ echo $NOTE
+}
+
+# ########################################################################
+# A wrapper around pidof, which might not exist. The first argument is the
+# command name to match.
+# ########################################################################
+_pidof() {
+ if ! pidof "${1}" 2>/dev/null; then
+ ps axo pid,ucomm | awk -v comm="${1}" '$2 == comm { print $1 }'
+ fi
+}
+
+# ########################################################################
+# Execute a MySQL command.
+# ########################################################################
+mysql_exec() {
+ mysql ${OPT_DEFT:+--defaults-file="${OPT_DEFT}"} \
+ ${OPT_LOPA:+--login-path="${OPT_LOPA}"} \
+ ${OPT_HOST:+-h"${OPT_HOST}"} ${OPT_PORT:+-P"${OPT_PORT}"} \
+ ${OPT_USER:+-u"${OPT_USER}"} ${OPT_PASS:+-p"${OPT_PASS}"} \
+ ${OPT_SOCK:+-S"${OPT_SOCK}"} -ss -e "$1"
+}
+
+# ########################################################################
+# A wrapper around lsof, which might not exist. The first argument is the
+# process ID to match. Otherwise, the fallback of listing /proc/pid/fd
+# will probably only work on Linux. For BSD, fstat will be used.
+# ########################################################################
+_lsof() {
+ PATH="$PATH:/usr/sbin:/sbin"
+ if ! lsof -p $1 2>/dev/null; then
+ if ! /bin/ls -l /proc/$1/fd 2>/dev/null; then
+ fstat -p $1 2>/dev/null
+ fi
+ fi
+}
+
+# ########################################################################
+# Generate a list of file handles that MySQL has open, but which are deleted,
+# and are not temp files such as /tmp/ib* files (InnoDB) or /tmp/ML* files
+# (binary logging). The first argument is a file containing the output of lsof
+# or ls -l for the open files. The second argument is the server's tmpdir.
+# ########################################################################
+check_deleted_files() {
+ awk -v tmpdir="${2}" '
+ /\(deleted\)/ { if ( index($0, tmpdir) == 0 ) {
+ if ( $NF ~ /deleted/ ) {
+ lf=NF-1;
+ }
+ else {
+ lf=NF;
+ }
+ print $lf;
+ }}' "${1}"
+}
+
+# ########################################################################
+# Determine whether this program is being executed directly, or sourced/included
+# from another file.
+# ########################################################################
+is_not_sourced() {
+ [ "${0##*/}" = "pmp-check-mysql-deleted-files" ] || [ "${0##*/}" = "bash" -a "$_" = "$0" ]
+}
+
+# ########################################################################
+# Execute the program if it was not included from another file.
+# This makes it possible to include without executing, and thus test.
+# ########################################################################
+if is_not_sourced; then
+ OUTPUT=$(main "$@")
+ EXITSTATUS=$STATE_UNKNOWN
+ case "${OUTPUT}" in
+ UNK*) EXITSTATUS=$STATE_UNKNOWN; ;;
+ OK*) EXITSTATUS=$STATE_OK; ;;
+ WARN*) EXITSTATUS=$STATE_WARNING; ;;
+ CRIT*) EXITSTATUS=$STATE_CRITICAL; ;;
+ esac
+ echo "${OUTPUT}"
+ exit $EXITSTATUS
+fi
+
+# ############################################################################
+# Documentation
+# ############################################################################
+: <<'DOCUMENTATION'
+=pod
+
+=head1 NAME
+
+pmp-check-mysql-deleted-files - Alert when MySQL's files are deleted.
+
+=head1 SYNOPSIS
+
+ Usage: pmp-check-mysql-deleted-files [OPTIONS]
+ Options:
+ -c CRIT Critical threshold; ignored.
+ --defaults-file FILE Only read mysql options from the given file.
+ Defaults to /etc/nagios/mysql.cnf if it exists.
+ -H HOST MySQL hostname.
+ -l USER MySQL username.
+ -L LOGIN-PATH Use login-path to access MySQL (with MySQL client 5.6).
+ -p PASS MySQL password.
+ -P PORT MySQL port.
+ -S SOCKET MySQL socket file.
+ -w WARN Warning threshold; changes the alert to WARN instead of CRIT.
+ --help Print help and exit.
+ --version Print version and exit.
+ Options must be given as --option value, not --option=value or -Ovalue.
+ Use perldoc to read embedded documentation with more details.
+
+=head1 DESCRIPTION
+
+This Nagios plugin looks at the files that the mysqld process has open, and
+warns if any of them are deleted that shouldn't be. This typically happens when
+there is a poorly written logrotate script or when a human makes a mistake at
+the command line. This can cause several bad effects. If a table has been
+deleted, of course, it is a serious matter. Such a file can also potentially
+fill up the disk invisibly. If the file is the server's log, it might mean that
+logging is effectively broken and any problems the server experiences could be
+undiagnosable.
+
+The plugin accepts the -w and -c options for compatibility with standard Nagios
+plugin conventions, but they are not based on a threshold. Instead, the plugin
+raises a critical alert by default, and if the -w option is given, it raises a
+warning instead, regardless of the option's value.
+
+This plugin doesn't alert about deleted temporary files, which are not a
+problem. By default, this plugin assumes that the server's temporary directory
+is either the TMPDIR environment variable, or if that is not set, then /tmp/.
+If you specify MySQL authentication options, the value will log into the
+specified MySQL instance and look at the C<tmpdir> variable to find the
+temporary directory.
+
+This plugin looks at the first running instance of MySQL, as found in the
+system process table, so it will not work on systems that have multiple
+instances running. It probably works best on Linux, though it might work on
+other operating systems. It relies on either lsof or fstat or the ability to
+list the files in the process's /proc/pid/fd directory.
+
+=head1 PRIVILEGES
+
+This plugin executes the following commands against MySQL:
+
+=over
+
+=item *
+
+C<SELECT> the system variable C<@@tmpdir>.
+
+=back
+
+This plugin executes the following UNIX commands that may need special privileges:
+
+=over
+
+=item *
+
+ps
+
+=item *
+
+C<lsof> or C<ls /proc/$pid/fd> (Linux), C<fstat> (BSD)
+
+=back
+
+The plugin should be able to find mysqld PID using C<ps> command.
+
+On BSD, if C<sysctl> option C<security.bsd.see_other_uids> is set to 0, C<ps>
+will not return mysqld PID if the plugin run from non-root user.
+
+=head1 COPYRIGHT, LICENSE, AND WARRANTY
+
+This program is copyright 2012-$CURRENT_YEAR$ Baron Schwartz, 2012-$CURRENT_YEAR$ Percona Inc.
+Feedback and improvements are welcome.
+
+THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation, version 2. You should have received a copy of the GNU General
+Public License along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+
+=head1 VERSION
+
+$PROJECT_NAME$ pmp-check-mysql-deleted-files $VERSION$
+
+=cut
+
+DOCUMENTATION