Hi I am unable to start mysqld service after I make changes in my.cnf to enable log-bin. After making changes the file looks like below:

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin

#This is what I added to enable log-bin


#That was what I added to enable log-bin
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M

# Disabling symbolic-links is recommended to prevent assorted security risks


I am using:

[ec2-user@pip my.cnf.d]$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.3 (Maipo)

Following is the ownership and permissions:

d]$ ls -ld /var/log/mysql
drwxrwxrwx. 2 mysql mysql 23 Sep  8 09:01 /var/log/mysql

Following is the error that I get:

[ec2-user@i.d]$ sudo service mysqld start
Redirecting to /bin/systemctl start  mysqld.service
Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

MySQL version is:

Server version: 5.7.19 MySQL Community Server (GPL)

Please let me know if any other detail is required

  • Not sure if this is related, but note the log_bin is not the same as log-bin. – RDFozz Sep 8 '17 at 16:37
  • This is related to binary log in MySQL which is used for database recovery – Kitty Sep 8 '17 at 17:29
  • My point was, the my.cnf file has a commented reference to log underscore bin, while you've set up log dash bin wanted to be sure that the problem isn't a simple typo there. If you already got that, my apologies. – RDFozz Sep 8 '17 at 17:57
  • What was in mysqld's error log? – Rick James Sep 8 '17 at 19:28
  • Just for the sake of clarity, is mysqld actually down ??? If you are not sure, please run service mysqld status. – RolandoMySQLDBA Sep 8 '17 at 19:55

According to the manual entry for the mysqld option log-bin:

If you specify this option without also specifying a --server-id, the server is not allowed to start.

So it seems you need something like:


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