A. MySQL server and client uses a file called my.cnf. You need to open /etc/my.cnf (Global mysqld configuration file) to specify new port.
MySQL Change Default Port
Open /etc/my.cnf file:# vi /etc/my.cnf
Set new port 5123:
port=5123
Here is is my sample /etc/my.cnf file:
[mysqld]Save and close the file. Restart mysqld:
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
port=5123
old_passwords=1
bind = 10.10.29.66
key_buffer = 500M
table_cache = 4000
sort_buffer_size = 3M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
myisam_sort_buffer_size = 64M
max_connections = 400
query_cache_type = 1
query_cache_limit = 1M
query_cache_size = 100M
max_allowed_packet = 1M
thread_cache_size = 8
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 4
local-infile=0
[mysql.server]
user=mysql
basedir=/var/lib
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[mysqldump]
quick
max_allowed_packet = 16M
# service mysqld restart
Please note that once port changed, you need to update all your php, perl, python scripts including iptables scripts.
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