This really is not a MySQL issue, but a Red Hat issue.
Don't logrotate the MySQL bin logs.
Joel Fowler wrote:
> Environment: Red Hat 7.1
> mysqld 3.23.36-log
>
> /etc/my.cnf as follows:
> ================
> [mysqld]
> datadir=/var/lib/mysql
> socket=/var/lib/mysql/mysql.sock
> log-bin=/bu/mysql/online-log/iServ2
> log-bin-index=/bu/mysql/online-log/iServ2.index
>
> [mysql.server]
> user=mysql
> basedir=/var/lib
>
> [safe_mysqld]
> err-log=/var/log/mysqld.log
> pid-file=/var/run/mysqld/mysqld.pid
>
> /etc/logrotate.d/mysqld (as distributed) follows:
> =================================
> /var/log/mysqld.log {
> missingok
> create 0640 mysql mysql
> prerotate
> [ -e /var/lock/subsys/mysqld ] && \
> /bin/kill -HUP `/bin/cat /var/run/mysqld/mysqld.pid` || /bin/true
> endscript
> postrotate
> [ -e /var/lock/subsys/mysqld ] && \
> /bin/kill -HUP `/bin/cat /var/run/mysqld/mysqld.pid` || /bin/true
> endscript
> }
>
> Problem Synopsis:
> ==============
> 1. /etc/logrotate.d/mysql executes a "kill -HUP <mysqld.pid>" during pre
> and postrotate operations.
> 2. -HUP causes mysqld to discard all existing bin-logs (DISASTER) and
> start a new one.
> 3. This destroys recovery strategies built on bin-logs.
> It also (as far as I can tell) will cause replication to loose logs
> and integrity.
> Note: This is a pretty big hole !!!
>
> To Simulate:
> =========
> 1. Configure bin-log(s)
> 2. List bin-log(s)
> 3. kill -HUP <mysqld.pid>
> 4. Bin-log(s) from 2. will have been purged and a new log started (as if
> "reset master" was performed).
> Note: For recovery and replication to work correctly existing
> bin-log(s) must be left in tact.
>
> Any help will be appreciated.
> Please advise,
>
> Joel Fowler
>
>
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--
Gerald L. Clark
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