mysql启动问题

终于解决上周遗留下来的mysql不能启动的问题了，原因是之前安装了两次mysql，而且路径不同，这里有别人的详细解决方案：http://www.linuxidc.com/Linux/2011-05/35409.htm

由于之前不知道问题所在，所以重新装了一个虚拟机，64bit的，前面不能make（zlib的问题，要对64机进行相应设置），编译安装成功后，又出现了不能启动的问题，提示的问题如下：

111128 01:39:59 mysqld_safe Logging to '/opt/mysql5/var/debian.err'.
touch: cannot touch `/opt/mysql5/var/debian.err': No such file or directory
chown: cannot access `/opt/mysql5/var/debian.err': No such file or directory
111128 01:39:59 mysqld_safe Starting mysqld daemon with databases from /opt/mysql5/var
bin/mysqld_safe: line 100: /opt/mysql5/var/debian.err: No such file or directory
bin/mysqld_safe: line 137: /opt/mysql5/var/debian.err: No such file or directory
111128 01:39:59 mysqld_safe mysqld from pid file /opt/mysql5/var/debian.pid ended
bin/mysqld_safe: line 100: /opt/mysql5/var/debian.err: No such file or directory

找了半天，没查出原因。最后发现，原来只是个小问题，先bin/mysql_install_db --user=mysql一下，再启动，问题解决！

另需要强调的是，安装mysql前一定不要忘记这两句：

groupadd mysql

useradd －g mysql mysql

接下来继续解决mongodb的问题，搭环境真苦逼！

另my.cnf具体内容如下：

[client]
port            = 3306
socket          = /tmp/mysql.sock
[mysqld]
port            = 3306
bind-address    = 0.0.0.0
socket          = /tmp/mysql.sock
skip-external-locking
key_buffer_size = 16M
max_allowed_packet = 1M
table_open_cache = 64
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
server-id       = 1
innodb_data_home_dir = /opt/mysql5/var
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = /opt/mysql5/var
innodb_buffer_pool_size = 700M
innodb_additional_mem_pool_size = 2M
innodb_log_file_size = 5M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 50
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout