* * * * * /usr/bin/mysqldump -h localhost -u source -p root mydb | gzip > /var/backup/all/database_`date +%Y-%m-%d`.sql.gz >/dev/null 2>&1when the crontab operation there is no backup record in the folder (my backup/all has actually the permission scheme 755).

This is error from /var/log/syslog

Aug 16 11:55:01 precise64 CRON<2213>: (vagrant) CMD (/usr/bin/mysqldump -h localhost -u root -p source mydb | gzip > /var/backup/all/database_`date +%Y-%m-%d`.sql.gz >/dev/null 2>&1)Aug 16 11:55:01 precise64 CRON<2212>: (CRON) details (No MTA installed, discarding output)So i think

it"s around crontab can"t develop backup document because of Permission denied.it"s about I"m didn"t install MTA but I use >/dev/null 2>&1 to disable crontab to sent it to email why that error ?
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edited Aug 21 "14 at 11:58

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asked Aug 16 "14 in ~ 15:26

Kanin PeanviriyakulkitKanin Peanviriyakulkit
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3 answers 3

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Of course, the error is that you don"t have actually a mailer (sendmail,postfix, etc) implemented and also active.

That being stated your other trouble is the the >/dev/null 2>&1 only only applies/associates come the last command in this case gzip. Thus there need to be some kind of output going to STDERR for your mysqldump.

You are watching: Cron info no mta installed discarding output

The correct way to do what ns think you want is:

* * * * * (command | command ) >/dev/null 2>&1
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answered Aug 16 "14 in ~ 18:20


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You can put:

MAILTO=""at the beginning of her crontab paper and the will stop it native trying to send email.

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answered may 21 "16 at 3:30

Michael ElkevizthMichael Elkevizth
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If the user running the crontab command is vagrant, and also the catalog where the calculation is created to is owned by root, and also has permissions 755, it deserve to not be written to.sudo chown vagrant /var/backup/allmay fix that.

To examine whether that"s the problem, try writing to a document in /tmp instead.

But there is one more problem: A command likemysqldump mydb | gzip > database.sql.gz >/dev/null 2>&1writes the database dump come database.sql.gz and also to /dev/null.The 2>&1 copies the error messages to the standart output, that method it likewise writes the error messages to database.sql.gz. That writes error post text just some where in between the compressed data, for this reason the compressed document will it is in broken. Keep in mind it might work fine when testing - together the trouble only occurs when something is written to the traditional error stream. The output to stderr might be simply a warning, while everything else works.

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I i think you intend to compose the compressed database dump come the sql.gz file, and the errors to /dev/null. Because that this, simply keep the calculation streams separate, by no copying the error stream come the calculation stream. And also direct them to the files like this:

mysqldump mydb | gzip > /var/backup/all/database_`date +%Y-%m-%d`.sql.gz 2>/dev/nullThe error article "(No MTA installed, discarding output)" is cron informing you the it deserve to not send friend the error output. That will certainly be no trouble in the finish as girlfriend redirect errors come /dev/null anyway, there will be nothing come send. However I suspect that right now there space error messages to send, that have to confirm my findings above.