我正在尝试在 ubuntu 上安装 mysql-5.5.29 源代码。每次我重新启动或启动服务时，它都会告诉我 MySQL Daemon 无法启动..
shell>>service mysql.server start
Starting MySQL
... * The server quit without updating PID file (/usr/local/mysql/data/ytl-HP-Pavilion- g4-Notebook-PC.pid).
shell>>less /usr/local/mysql/data/ytl-HP-Pavilion-g4-Notebook-PC.err
130106 12:20:27 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
130106 12:20:27 InnoDB: The InnoDB memory heap is disabled
130106 12:20:27 InnoDB: Mutexes and rw_locks use GCC atomic builtins
130106 12:20:27 InnoDB: Compressed tables use zlib 1.2.7
130106 12:20:27 InnoDB: Using Linux native AIO
130106 12:20:27 InnoDB: Initializing buffer pool, size = 128.0M
130106 12:20:27 InnoDB: Completed initialization of buffer pool
130106 12:20:27 InnoDB: highest supported file format is Barracuda.
130106 12:20:27 InnoDB: Waiting for the background threads to start
130106 12:20:28 InnoDB: 1.1.8 started; log sequence number 1595675
130106 12:20:28 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
130106 12:20:28 [Note] - '0.0.0.0' resolves to '0.0.0.0';
130106 12:20:28 [Note] Server socket created on IP: '0.0.0.0'.
130106 12:20:28 [ERROR] Can't start server : Bind on unix socket: Address already in use
130106 12:20:28 [ERROR] Do you already have another mysqld server running on socket: /var/lib/mysql ?
130106 12:20:28 [ERROR] Aborting
130106 12:20:28 InnoDB: Starting shutdown...
130106 12:20:29 InnoDB: Shutdown completed; log sequence number 1595675
130106 12:20:29 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete
130106 12:20:29 mysqld_safe mysqld from pid file /usr/local/mysql/data/ytl-HP-Pavilion-g4-Notebook-PC.pid ended
shell>>ps aux |grep mysql
root 4884 0.0 0.0 5832 836 pts/1 S+ 12:27 0:00 grep --color=auto mysql
shell>ll /usr/local/mysql
drwxr-xr-x 13 root mysql 4096 1月 5 14:54 ./
drwxr-xr-x 13 root root 4096 1月 5 14:54 ../
drwxr-xr-x 2 root mysql 4096 1月 5 14:54 bin/
-rw-r--r-- 1 root mysql 17987 12月 10 14:16 COPYING
drwxr-xr-x 5 mysql mysql 4096 1月 6 12:23 data/
drwxr-xr-x 2 root mysql 4096 1月 5 14:54 docs/
drwxr-xr-x 3 root mysql 4096 1月 5 14:54 include/
-rw-r--r-- 1 root mysql 7605 12月 10 14:16 INSTALL-BINARY
drwxr-xr-x 3 root mysql 4096 1月 5 14:54 lib/
drwxr-xr-x 4 root mysql 4096 1月 5 14:54 man/
drwxr-xr-x 10 root mysql 4096 1月 5 14:54 mysql-test/
-rw-r--r-- 1 root mysql 2552 12月 10 14:16 README
drwxr-xr-x 2 root mysql 4096 1月 5 14:54 scripts/
drwxr-xr-x 27 root mysql 4096 1月 5 14:54 share/
drwxr-xr-x 4 root mysql 4096 1月 5 14:54 sql-bench/
drwxr-xr-x 2 root mysql 4096 1月 5 14:54 support-files/
昨天安装mysql时，我使用：
cmake . -DCMAKE_INSTALL_PREFIX="/usr/local/mysql" \
-DMYSQL_UNIX_ADDR=/var/lib/mysql
但是我发现 /var/lib/mysql 在我使用时是空的：
shell>> ll /var/lib/mysql
drwxr-xr-x 2 root root 4096 1月 2 23:38 ./
drwxr-xr-x 65 root root 4096 1月 2 23:38 ../
似乎 3306 套接字未在使用中
shell>>netstat -na | grep LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN
tcp6 0 0 ::1:631 :::* LISTEN
unix 2 [ ACC ] 流 LISTENING 14474 @/tmp/.ICE-unix/1685
unix 2 [ ACC ] 流 LISTENING 14475 /tmp/.ICE-unix/1685
unix 2 [ ACC ] 流 LISTENING 14449 /tmp/ssh- KTntrIp1gXrU/agent.1685
unix 2 [ ACC ] 流 LISTENING 2030 /tmp/.X11-unix/X0
unix 2 [ ACC ] 流 LISTENING 14142 /tmp/.com.google.Chrome.faNSdW/SingletonSocket
unix 2 [ ACC ] 流 LISTENING 13570 /run/user/ytlreal/keyring-cuLMzX/ssh
unix 2 [ ACC ] 流 LISTENING 14533 /tmp/pulse-dTohrWydajmn/native
unix 2 [ ACC ] 流 LISTENING 13581 /run/user/ytlreal/keyring-cuLMzX/pkcs11
unix 2 [ ACC ] 流 LISTENING 13583 /run/user/ytlreal/keyring-cuLMzX/gpg
unix 2 [ ACC ] 流 LISTENING 18200 /var/run/cups/cups.sock
unix 2 [ ACC ] 流 LISTENING 11828 /run/user/ytlreal/keyring-cuLMzX/control
unix 2 [ ACC ] 流 LISTENING 8408 @/com/ubuntu/upstart
unix 2 [ ACC ] 流 LISTENING 7998 @/org/bluez/audio
unix 2 [ ACC ] 流 LISTENING 2029 @/tmp/.X11-unix/X0
unix 2 [ ACC ] 流 LISTENING 11869 @/tmp/dbus-oZvW58NsSp
unix 2 [ ACC ] 流 LISTENING 8081 /var/run/acpid.socket
unix 2 [ ACC ] 流 LISTENING 9896 /var/run/dbus/system_bus_socket
unix 2 [ ACC ] 流 LISTENING 14913 @/tmp/dbus-2gkvFVNb
unix 2 [ ACC ] 流 LISTENING 9933 /var/run/sdp
unix 2 [ ACC ] 流 LISTENING 14457 @/tmp/dbus-kTBAyCa0aq
unix 2 [ ACC ] 流 LISTENING 9209 /var/run/avahi-daemon/socket
unix 2 [ ACC ] SEQPACKET LISTENING 8445 /run/udev/control