mysql 5.7 enable binlog

we can see, the log_bin is disabled.

2. Turn on mysql log_bin

sudo vim /etc/mysql/conf.d/mysql.cnf 

add the following config segment at the end of the file

# ----------------------------------------------
# Enable the binlog for replication & CDC
# ----------------------------------------------

# Enable binary replication log and set the prefix, expiration, and log format.
# The prefix is arbitrary, expiration can be short for integration tests but would
# be longer on a production system. Row-level info is required for ingest to work.
# Server ID is required, but this will vary on production systems
server-id         = 223344
log_bin           = /var/lib/mysql/mysql-bin
expire_logs_days  = 3
binlog_format     = row
#Mysql Packet Size may need to be re-configured. MySQL may have, by default, a ridiculously low allowable packet size. 
#To increase it, you’ll need to have the property max_allowed_packet set to a higher number, say 1024M.
max_allowed_packet=1024M

this configration means:

a) the server id is unique for each server, an is required for log_bin capture, it should be a numeric number equal or greater than 0, in my instance I set it to 223344, this number should be unique in the whole cluster.  seems it‘s a good idea to set it as the ip

address number of the machine install. I fact I have do this in my real production enviroment.

b) the path of the log_bin, this is required  to define the storage location fo the log_bin.

c) the log_bin retention time, in my case, I set it to 3 days.

d. the bin_log format, we should define it as row.

The whole definition file in my case is:

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

[mysqld]
#
# 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
#
# 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
skip-host-cache
skip-name-resolve
#datadir=/var/lib/mysql
#socket=/var/lib/mysql/mysql.sock
#secure-file-priv=/var/lib/mysql-files
user=mysql

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

#log-error=/var/log/mysqld.log
#pid-file=/var/run/mysqld/mysqld.pid

# ----------------------------------------------
# Enable the binlog for replication & CDC
# ----------------------------------------------

# Enable binary replication log and set the prefix, expiration, and log format.
# The prefix is arbitrary, expiration can be short for integration tests but would
# be longer on a production system. Row-level info is required for ingest to work.
# Server ID is required, but this will vary on production systems
server-id         = 223344
log_bin           = /var/lib/mysql/mysql-bin
expire_logs_days  = 3
binlog_format     = row
#Mysql Packet Size may need to be re-configured. MySQL may have, by default, a ridiculously low allowable packet size. 
#To increase it, you’ll need to have the property max_allowed_packet set to a higher number, say 1024M.
max_allowed_packet=1024M

3. restart mysql service

systemctl restart mysql

after the mysql restarted, we use the command 

show variables like ‘%log_bin%‘;

and we should found the log_bin is turned on now:  log_bin                         | ON  

 then we go to file system, and can fould like this :

the log bin files are just there now!

-rw-r----- 1 mysql mysql 177 Apr 20 15:06 mysql-bin.000001
-rw-r----- 1 mysql mysql 154 Apr 20 15:22 mysql-bin.000002
-rw-r----- 1 mysql mysql 64 Apr 20 15:22 mysql-bin.index

Notes: every time we restart the mysql server instance, it will  call flush logs and then create a new binlog file. 

mysql 5.7 enable binlog

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