Install MySQL 5.5.27 64-bit RPM on CentOS 6.2 x86_64

Ref: http://gadelkareem.com/2012/02/27/install-mysql-5-5-21-64-bit-rpm-on-centos-6-2-x86_64/

http://forums.cpanel.net/f354/usr-bin-mysqladmin-connect-server-localhost-failed-162837.html

- Remove old version

yum remove mysql mysql-devel mysql-server mysql-libs

- Download the needed packages from http://dev.mysql.com/downloads/mysql/#downloads
Download URL varies depending on download mirror

mkdir mysqlcd mysql#MySQL-client-5.5.27-1.el6.x86_64.rpmwget http://cdn.mysql.com/Downloads/MySQL-5.5/MySQL-client-5.5.27-1.el6.x86_64.rpm#MySQL-shared-5.5.27-1.el6.x86_64.rpmwget http://cdn.mysql.com/Downloads/MySQL-5.5/MySQL-shared-5.5.27-1.el6.x86_64.rpm#MySQL-devel-5.5.27-1.el6.x86_64.rpmwget http://cdn.mysql.com/Downloads/MySQL-5.5/MySQL-devel-5.5.27-1.el6.x86_64.rpm#MySQL-server-5.5.27-1.el6.x86_64.rpmwget http://cdn.mysql.com/Downloads/MySQL-5.5/MySQL-server-5.5.27-1.el6.x86_64.rpm#MySQL-shared-compat-5.5.27-1.el6.x86_64.rpmwget http://cdn.mysql.com/Downloads/MySQL-5.5/MySQL-shared-compat-5.5.27-1.el6.x86_64.rpm #installrpm -Uvh *#create log dirmkdir /var/log/mysqlchmod 777 /var/log/mysql #start MySQL/etc/init.d/mysql start#add root password/usr/bin/mysqladmin -u root password 'new-password'/usr/bin/mysqladmin -u root -h centos6.vmware.local password 'new-password'

- configure mysql more info

vi /etc/my.cnf

# Example MySQL config file for large systems.## This is for a large system with memory = 512M where the system runs mainly# MySQL.## MySQL programs look for option files in a set of# locations which depend on the deployment platform.# You can copy this option file to one of those# locations. For information about these locations, see:# http://dev.mysql.com/doc/mysql/en/option-files.html## 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[client]#password= your_passwordport= 3306socket= /var/lib/mysql/mysql.sock # Here follows entries for some specific programs # The MySQL server[mysqld]port= 3306socket= /var/lib/mysql/mysql.sock#The number of outstanding connection requests MySQL can have (Default50)back_log = 200skip-external-locking#Disable the InnoDB storage engineskip-innodbkey_buffer_size = 256Mjoin_buffer_size = 10Msort_buffer_size = 10Mbulk_insert_buffer_size = 16M max_allowed_packet = 1Mtable_open_cache = 400 read_buffer_size = 1Mread_rnd_buffer_size = 4Mmyisam_sort_buffer_size = 64Mmyisam_max_sort_file_size = 2Gmyisam_repair_threads = 2#http://dev.mysql.com/doc/refman/5.5/en/server-options.html#option_mysqld_myisam-recover-optionsmyisam-recover-options=backup,forcethread_stack  = 192K wait_timeout = 7200interactive_timeout=7200connect_timeout = 5 max_heap_table_size = 64Mmax_connect_errors = 5 thread_cache_size = 8query_cache_size =16Mquery_cache_limit = 4Mquery_cache_type = 1query_prealloc_size = 1Mquery_alloc_block_size = 1M#http://dev.mysql.com/doc/refman/5.5/en/server-options.html#option_mysqld_default-storage-enginedefault-storage-engine = MyISAM #using UTF-8 as default character set.collation_server=utf8_general_cicharacter_set_server=utf8 #logginglong_query_time=1slow_query_log=1slow_query_log_file =/var/log/mysql/slow.loggeneral_log=0general_log_file=/var/log/mysql/general.loglog-error=/var/log/mysql/error.log # Try number of CPU's*2 for thread_concurrencythread_concurrency = 8#The maximum permitted number of simultaneous client connections http://dev.mysql.com/doc/refman/5.5/en/too-many-connections.htmlmax_connections = 2048 # 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!# skip-networking#use only IP numbers, do not resolve host names skip-name-resolve # Replication Master Server (default)# binary logging is required for replicationlog-bin=mysql-bin # binary logging format - mixed recommendedbinlog_format=mixed # 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 omittedserver-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:##    CHANGE MASTER TO MASTER_HOST=, MASTER_PORT=,#    MASTER_USER=, MASTER_PASSWORD= ;##    where you replace , ,  by quoted strings and#     by the master's port number (3306 by default).##    Example:##    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,#    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 master.info file, and any later#    change in this file to the variables' values below will be ignored and#    overridden by the content of the master.info file, unless you shutdown#    the slave server, delete master.info 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     =   ## The username the slave will use for authentication when connecting# to the master - required#master-user     =   ## The password the slave will authenticate with when connecting to# the master - required#master-password =   ## The port the master is listening on.# optional - defaults to 3306#master-port     =  ## binary logging - not required for slaves, but recommended#log-bin=mysql-bin # 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# 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 [mysql.server]user=mysql [mysqld_safe]nice = -20open_files_limit=100000log-error=/var/log/mysql/error.log [mysqldump]quickmax_allowed_packet = 10M [mysql]no-auto-rehash# Remove the next comment character if you are not familiar with SQL#safe-updates [myisamchk]key_buffer_size = 128Msort_buffer_size = 128Mread_buffer = 2Mwrite_buffer = 2M [mysqlhotcopy]interactive-timeout

-restart MySQL

/etc/init.d/mysql restart

用mysqld_safe --user=mysql --skip-grant-tables --skip-networking启动mysql 然后进去给root把密码加上

mysql> update mysql.user set password=PASSWORD('这里改成你的密码') where User='root';
mysql> flush privileges;
mysql> quit

然后在重启mysql 用新设的密码访问

mysql启动后未开启3306端口

原因有二。
一是mysql服务未启动，需要在/etc/rc.conf中启用mysql，具体的参数在启动脚本中。一般的是在/etc/rc.conf中增加一行mysql_enable="YES"
二是mysql的默认设置不打开3306端口。可找到配置文件，我想是在/usr/local/etc/my.conf， 注释掉以skip-network开头的那一行。重启mysql服务即可。