forked from quickshiftin/mysqlbkup
-
Notifications
You must be signed in to change notification settings - Fork 0
/
mysqlbkup.sh
executable file
·164 lines (136 loc) · 5.03 KB
/
mysqlbkup.sh
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
#!/bin/bash
# --------------------------------------------------------------------------------
# mysqlbkup
# (c) Nathan Nobbe 2014
# http://quickshiftin.com
#
# A simple MySQL backup script in BASH.
#
# All it does is loop over every database and create a backup
# file. Every database has its own direcotry beneath the root
# backup directory, $BACKUP_DIR.
#
# We're using gzip compression on each backup file and
# labeling backup files by date. The number of backup files
# per db is controlled by $MAX_BACKUPS.
#
# The script is intended to be run by a cron job. It echos
# messages to STDOUT which can be redirected to a file for
# simple logging.
# --------------------------------------------------------------------------------
# mysql server info ------------------------------------------
if [ -e /etc/mysqlbkup.config ]; then
. /etc/mysqlbkup.config
fi
if [ -z "$DEFAULTS_FILE" ]; then
echo 'mysql configuration file (DEFAULTS_FILE) not set in configuration.' 1>&2
exit 1
fi
if [ -z "$BACKUP_DIR" ]; then
echo 'Backup directory not set in configuration.' 1>&2
exit 3
fi
if [ -z "$MAX_BACKUPS" ]; then
echo 'Max backups not configured.' 1>&2
exit 4
fi
if [ ! -d "$BACKUP_DIR" ]; then
echo "Backup directory $BACKUP_DIR does not exist." 1>&2
exit 5
fi
if [ ! -e $DEFAULTS_FILE ]; then
echo "DEFAULTS_FILE ($DEFAULTS_FILE) does not exist" 1>&2
exit 6
fi
if ! grep -Fxq "[mysql]" $DEFAULTS_FILE; then
echo "DEFAULTS_FILE ($DEFAULTS_FILE) missing [mysql] block" 1>&2
exit 7
fi
if ! grep -Fxq "[mysqldump]" $DEFAULTS_FILE; then
echo "DEFAULTS_FILE ($DEFAULTS_FILE) missing [mysqldump] block" 1>&2
exit 8
fi
if ! (stat -c "%a" $DEFAULTS_FILE | grep -xq ".00"); then
echo "DEFAULTS_FILE ($DEFAULTS_FILE) needs secure file permissions" 1>&2
exit 9
fi
# First command line arg indicates dry mode meaning don't actually run mysqldump
DRY_MODE=0
if [ -n "$1" -a "$1" == 'dry' ]; then
DRY_MODE=1
fi
# Check for external dependencies, bail with an error message if any are missing
for program in date $BKUP_BIN head hostname ls mysql mysqldump rm tr wc
do
which $program 1>/dev/null 2>/dev/null
if [ $? -gt 0 ]; then
echo "External dependency $program not found or not in $PATH" 1>&2
exit 6
fi
done
# the date is used for backup file names
date=$(date +%F)
# get the list of dbs to backup, may as well just hit them all..
dbs=$(echo 'show databases' | mysql --defaults-file=$DEFAULTS_FILE )
# Apply default filters
db_filter='Database information_schema performance_schema mysql'
if [ ${#DB_EXCLUDE_FILTER} -gt 0 ]; then
db_filter="$db_filter ${DB_EXCLUDE_FILTER}"
fi
echo "== Running $0 on $(hostname) - $date =="; echo
# loop over the list of databases
for db in $dbs
do
# Check to see if the current database should be skipped
skip='';
for filter in $db_filter; do
real_filter="${filter:1}"
# default to bash pattern matching
# with support for regular expression matching instead
match_type='='
if [ "${filter:0:1}" == '~' ]; then
match_type='=~'
fi
# Evalute the matching expression such that metacharacters like * are
# treated appropriately instead of literally
# @note If you know a way to do this without invoking the shell again please make this better!
# This was the only way I could figure out how to do it with my skill level in BASH.
cmd='if [[ "'"$db"'" '"$match_type"' '"$filter"' ]]; then echo skip; fi;';
skip=$(bash -c "$cmd");
# Skip this database if
if [ "$skip" == skip ]; then
continue 2;
fi
done;
backupDir="$BACKUP_DIR/$db" # full path to the backup dir for $db
backupFile="$date-$db.sql.$BKUP_EXT" # filename of backup for $db & $date
echo "Backing up $db into $backupDir"
# each db gets its own directory
if [ ! -d "$backupDir" ]; then
# create the backup dir for $db if it doesn't exist
echo "Creating directory $backupDir"
mkdir -p "$backupDir"
else
# nuke any backups beyond $MAX_BACKUPS
numBackups=$(ls -1lt "$backupDir"/*."$BKUP_EXT" 2>/dev/null | wc -l) # count the number of existing backups for $db
if [ -z "$numBackups" ]; then numBackups=0; fi
if [ "$numBackups" -gt "$MAX_BACKUPS" ]; then
# how many files to nuke
((numFilesToNuke = "$numBackups - $MAX_BACKUPS + 1"))
# actual files to nuke
filesToNuke=$(ls -1rt "$backupDir"/*."$BKUP_EXT" | head -n "$numFilesToNuke" | tr '\n' ' ')
echo "Nuking files $filesToNuke"
rm $filesToNuke
fi
fi
# create the backup for $db
echo "Running: mysqldump --defaults-file=$DEFAULTS_FILE $db | $BKUP_BIN > $backupDir/$backupFile"
# Skip actual call to mysqldump in DRY mode
if [ $DRY_MODE -eq 1 ]; then
continue;
fi
mysqldump --defaults-file=$DEFAULTS_FILE "$db" | $BKUP_BIN > "$backupDir/$backupFile"
echo
done
echo "Finished running - $date"; echo