MySQL doesn't logs error to new file after rotating?

Question

Problem solved but I'm writing down for the future reference.

/root/.my.cnf

[mysqladmin] user = root password = pa$$w0rd

/etc/logrotate.d/mysql

/var/log/mysql-slow.log /var/log/mysqld.log { daily rotate 7 dateext compress missingok #notifempty sharedscripts create 644 mysql mysql postrotate /usr/bin/mysqladmin flush-logs endscript }

logrotate is working fine when running from the command line:

# logrotate -v -f /etc/logrotate.d/mysql

but it doesn't work when running from cron at 4 A.M. The logs file was rotated but MySQL doesn't logs the error to newly created file:

-rw-r--r-- 1 mysql mysql 0 Aug 7 10:13 /var/log/mysqld.log -rw-r--r-- 1 mysql mysql 20 Aug 4 04:04 /var/log/mysqld.log-20120804.gz -rw-r--r-- 1 mysql mysql 20 Aug 5 04:04 /var/log/mysqld.log-20120805.gz -rw-r--r-- 1 mysql mysql 20 Aug 6 16:28 /var/log/mysqld.log-20120806.gz

quanta · Accepted Answer · 2012-08-09 03:35:20Z

In the postrotate, I redirect both stderr and stdout to a log file to see what happens:

postrotate /usr/bin/mysqladmin flush-logs > /var/log/mysqladmin.flush-logs 2>&1 endscript

What I get is:

/usr/bin/mysqladmin: connect to server at 'localhost' failed error: 'Access denied for user 'root'@'localhost' (using password: NO)'

It sounds like mysqladmin doesn't read /root/.my.cnf during logrotate.

So, try this:

postrotate env HOME=/root/ /usr/bin/mysqladmin flush-logs > /var/log/mysqladmin.flush-logs 2>&1 endscript

Source:

codewaggle · Accepted Answer · 2013-01-14 10:28:14Z

I had a similar problem.

I didn't restart MySQL after adding /root/.my.cnf, so the postrotate flush command wasn't run.

Once I restarted MySQL it read the root my.cnf file and worked as expected.

Izzy · Accepted Answer · 2017-01-09 08:33:07Z

In my case, the block in /etc/logrotate.d/mysql looked a bit different:

postrotate test -x /usr/bin/mysqladmin || exit 0 if [ -f `my_print_defaults --mysqld | grep -oP "pid-file=\K[^$]+"` ]; then # If this fails, check debian.conf! mysqladmin --defaults-file=/etc/mysql/debian.cnf flush-logs fi endscript

Note the comment: "If this fails, check debian.conf!" and the command having the parameter --defaults-file=/etc/mysql/debian.cnf. This file had the very same [client] section, defining user root with an empty password. So obviously, the very same password used in /root/.my.cnf had to be placed in that file as well. Security-wise, /etc/mysql/debian.cnf is similar to /root/.my.cnf: owned by root:root, and chmodded to 0600.

shgnInc · Accepted Answer · 2019-01-26 11:00:30Z

So, In my case, There's a permission problem to debian-sys-maint user, because of, the galera-cluster has the same integrity on each node, although, each node install individually, by the debian user for each one, which, the config file is /etc/mysql/debian.cnf

So in the logrotate file is:

postrotate test -x /usr/bin/mysqladmin || exit 0 if [ -f `my_print_defaults --mysqld | grep -oP "pid-file=\K[^$]+"` ]; then # If this fails, check debian.conf! mysqladmin --defaults-file=/etc/mysql/debian.cnf --local flush-error-log \ flush-engine-log flush-general-log flush-slow-log fi endscript

The solution so simple, just, change the password of debian-sys-maint user on one node, and set the password on the '/etc/mysql/debian.cnf' file on every nodes

SET PASSWORD FOR 'debian-sys-maint'@'localhost' = password('YOUR PASSWORD');

I hope, it be useful, as mine.

Юрий Светлов · Accepted Answer · 2020-03-21 23:36:33Z

In my case. I need have been set --defaults-file="/root/.my.cnf" to /root/.my.cnf in /usr/local/mysql/bin/mysqladmin --defaults-file="/root/.my.cnf" ping and /usr/local/mysql/bin/mysqladmin --defaults-file="/root/.my.cnf" flush-logs

/etc/logrotate.d/mysql

/var/log/mysql/mysql_general_log.log /var/log/mysql/error.log { create 600 mysql mysql notifempty daily rotate 5 missingok compress postrotate # just if mysqld is really running if test -x /usr/local/mysql/bin/mysqladmin && \ /usr/local/mysql/bin/mysqladmin --defaults-file="/root/.my.cnf" ping &>/dev/null then /usr/local/mysql/bin/mysqladmin --defaults-file="/root/.my.cnf" flush-logs fi endscript }

My /root/.my.cnf have

-rw------- 1 root root 43 Mar 21 20:51 .my.cnf

[mysqladmin] password= 111 user= root

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