{"id":12,"date":"2009-08-08T16:03:06","date_gmt":"2009-08-08T16:03:06","guid":{"rendered":"http:\/\/www.adriangrigoras.com\/blog\/?p=12"},"modified":"2009-08-08T16:03:06","modified_gmt":"2009-08-08T16:03:06","slug":"simple-backup-in-linux","status":"publish","type":"post","link":"https:\/\/adriangrigoras.com\/blog\/simple-backup-in-linux\/","title":{"rendered":"Simple backup in Linux"},"content":{"rendered":"

Sometimes, when you writing code you make a lot of mistakes and you want to go back to a previous version, but you don’t have one. It’s recommended that you always back-up your data.<\/p>\n

I tried a lot of back-up solutions, but they didn’t satisfy what I need. I need to make a backup to a certain moment and to have permission to read data.<\/p>\n

So, I started to write a simple backup program. Here it is:<\/p>\n

First, we need to write a Perl script which will tar and gzip some data and also write to a log file<\/p>\n

\n
!# \/usr\/bin\/perl
\nprint “Starting..n”;
\n($second, $minute, $hour, $dayOfMonth, $month, $yearOffset, $dayOfWeek, $dayOfYear, $daylightSavings) = localtime();
\n$year=1900+$yearOffset;
\n$x=int(rand(100));
\n$time=”$year-$month-$dayOfMonth-$hour$minute$second”;
\nopen (FILE, “>>”, “$ARGV[0]-backup.log”);
\nprint FILE “Start back-up $timen”;
\n&run(“tar -cf $ARGV[0]-$time.tar $ARGV[1]”);
\n&run(“gzip $ARGV[0]-$time.tar”);
\n&run(“chmod 777 $ARGV[0]-$time.tar.gz”);
\nprint FILE “Finished back-up $timenn “;
\nclose (FILE);
\nprint “Finished!nn”;
\nsub run(){
\n# print “”;
\n@args = ($_[0]);
\nsystem(@args) == 0 or die “system @args failed: $?”;<\/p>\n

if ($? == -1) {
\nprint “failed to execute: $!n”;
\n}
\nelsif ($? & 127) {
\nprintf “child died with signal %d, %s coredumpn”,
\n($? & 127),\u00a0 ($? & 128) ? ‘with’ : ‘without’;
\n}
\nelse {
\n#printf “child exited with value %dn”, $? >> 8;
\n}
\n}<\/p>\n<\/address>\n

1;<\/address>\n<\/blockquote>\n

After this we need a bash file which will be a cronjob<\/p>\n

\n
#!\/bin\/bash
\necho -n “Running backup.cgi”
\ncd $(dirname $0)
\nperl $(dirname $0)\/backup.cgi $@
\nexit 0<\/address>\n<\/blockquote>\n

Copy those scripts to a directory and chmod 755 them to be executable:<\/p>\n

\n
chmod 755 backup.cgi<\/address>\n
chmod 755 backup.sh
\n<\/address>\n<\/blockquote>\n

Finally, we add those cron jobs. Because I need to backup some files that my user don’t have permission I insert those cron jobs into root’s crontab:<\/p>\n

\n
# crontab -e<\/address>\n
0 * * * * \/home\/adrian\/backup\/backup.sh apache \/srv\/www
\n15 * * * * \/home\/adrian\/backup\/backup.sh apache \/srv\/www
\n30 * * * * \/home\/adrian\/backup\/backup.sh apache \/srv\/www
\n45 * * * * \/home\/adrian\/backup\/backup.sh apache \/srv\/www
\n0 * * * * \/home\/adrian\/backup\/backup.sh mysql \/var\/lib\/mysq
\n<\/address>\n<\/blockquote>\n

This will backup the content of Apache server every 15 minutes and the MySQL databases every hour.<\/p>\n

The syntax for crontab is the following:<\/p>\n

.—————- minute (0 – 59) <\/address>\n
| .————- hour (0 – 23)<\/address>\n
| | .———- day of month (1 – 31)<\/address>\n
| | | .——- month (1 – 12) OR jan,feb,mar,apr … <\/address>\n
| | | | .—- day of week (0 – 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat <\/address>\n
| | | | | <\/address>\n
* * * * * command to be executed > file_where_to_write_output<\/address>\n
<\/address>\n

I hope you find useful this program!<\/p>\n

#!\/bin\/bash<\/p>\n

echo -n “Running backup.cgi”<\/p>\n

cd $(dirname $0)<\/p>\n

perl $(dirname $0)\/backup.cgi $@<\/p>\n

exit 0<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Sometimes, when you writing code you make a lot of mistakes and you want to go back to a previous version, but you don’t have one. It’s recommended that you always back-up your data. I tried a lot of back-up solutions, but they didn’t satisfy what I need. I need to make a backup to\u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,11,14],"tags":[],"class_list":["post-12","post","type-post","status-publish","format-standard","hentry","category-bash","category-linux","category-perl"],"_links":{"self":[{"href":"https:\/\/adriangrigoras.com\/blog\/wp-json\/wp\/v2\/posts\/12","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/adriangrigoras.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/adriangrigoras.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/adriangrigoras.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/adriangrigoras.com\/blog\/wp-json\/wp\/v2\/comments?post=12"}],"version-history":[{"count":0,"href":"https:\/\/adriangrigoras.com\/blog\/wp-json\/wp\/v2\/posts\/12\/revisions"}],"wp:attachment":[{"href":"https:\/\/adriangrigoras.com\/blog\/wp-json\/wp\/v2\/media?parent=12"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/adriangrigoras.com\/blog\/wp-json\/wp\/v2\/categories?post=12"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/adriangrigoras.com\/blog\/wp-json\/wp\/v2\/tags?post=12"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}