Config. MySQL 5.0 to allow remote connection on Red Hat Linux

Posted on 2006-06-22
Last Modified: 2008-03-06

I installed a MySQL 5.0 on a server, and I want to connect to the database from another computer.
What setting should I perform on the MySQL server? Edit the my.cnf file?



Question by:huabin
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LVL 30

Accepted Solution

todd_farmer earned 500 total points
ID: 16964682

You need to set up a user account with access from a remote machine and ensure that any firewalls are not prohibiting access to port 3306.  That's about it.
LVL 30

Expert Comment

ID: 16964689
GRANT syntax for creating a user with access from a specific (or wildcard) client is detailed here:

Author Comment

ID: 16964957

This is the query I ran in the mysql database,
however, when I try to use PHP on the client computer to connect the server(where PHP is not installed),
I get this this error:

 $dbh=mysql_connect ("xx.xx.xx.xx:3306", "myuser", "some_password")
      or die ('I cannot connect to the database because: ' . mysql_error());

"Can't connect to MySQL server on '' (10065)"
Also, I look at my my.cnf, and nothing sees wrong with me

# Example MySQL config file for large systems.
# This is for a large system with memory = 512M where the system runs mainly
# MySQL.
# You can copy this file to
# /etc/my.cnf to set global options,
# mysql-data-dir/my.cnf to set server-specific options (in this
# installation this directory is /var/lib/mysql) or
# ~/.my.cnf to set user-specific options.
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MySQL clients
#password       = your_password
port            = 3306
socket          = /var/lib/mysql/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
port            = 3306
socket          = /var/lib/mysql/mysql.sock
key_buffer = 256M
max_allowed_packet = 1M
table_cache = 256
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size= 16M
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 8

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!

# Replication Master Server (default)
# binary logging is required for replication

# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id       = 1

# Replication Slave (comment out master section to use this)
# To configure this host as a replication slave, you can choose between
# two methods :
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#    Example:
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
# OR
# 2) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the file, unless you shutdown
#    the slave server, delete and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id       = 2
# The replication master for this slave - required
#master-host     =   <hostname>
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   <username>
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =   <password>
# The port the master is listening on.
# optional - defaults to 3306
#master-port     =  <port>
# binary logging - not required for slaves, but recommended

# Point the following paths to different dedicated disks
#tmpdir         = /tmp/
#log-update     = /path-to-dedicated-directory/hostname

# Uncomment the following if you are using BDB tables
#bdb_cache_size = 64M
#bdb_max_lock = 100000

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /var/lib/mysql/
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /var/lib/mysql/
#innodb_log_arch_dir = /var/lib/mysql/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 256M
#innodb_additional_mem_pool_size = 20M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 64M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

max_allowed_packet = 16M

# Remove the next comment character if you are not familiar with SQL

key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[root@LINUX-VM1 ~]#

LVL 30

Expert Comment

ID: 16965023
I agree that nothing seems particularly wrong with the my.cnf file.  Are you sure you can get to port 3306 from the other machine?

Author Comment

ID: 16972650
RedHat Linux Enterprise install firewall by default!!!

I run the firewall setting, and allow port 3306, everything works now.


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