The Pid File Error

port     = 3306
socket   = /var/lib/mysql/mysql.sock
#skip-locking
#skip-networking
#skip-innodb


#key_buffer=16M
#max_allowed_packet=1M
#table_cache=64
#sort_buffer=512K
#net_buffer_length=8K
#myisam_sort_buffer_size=8M
#server-id      = 1

# 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
#set-variable   = bdb_cache_size=4M
#set-variable   = bdb_max_lock=10000

# 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
#set-variable = innodb_buffer_pool_size=16M
#set-variable = innodb_additional_mem_pool_size=2M
# Set .._log_file_size to 25 % of buffer pool size
#set-variable = innodb_log_file_size=5M
#set-variable = innodb_log_buffer_size=8M
#innodb_flush_log_at_trx_commit=1
#set-variable = innodb_lock_wait_timeout=50

[mysqldump]
quick
set-variable    = max_allowed_packet=16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[isamchk]
set-variable    = key_buffer=20M
set-variable    = sort_buffer=20M
set-variable    = read_buffer=2M
set-variable    = write_buffer=2M

[myisamchk]
set-variable    = key_buffer=20M
set-variable    = sort_buffer=20M
set-variable    = read_buffer=2M
set-variable    = write_buffer=2M

[mysqlhotcopy]
interactive-timeout

[root@s16579201 mysql]# vi /etc/my.cnf
[root@s16579201 mysql]# tail -f /var/log/mysqld.log
2013-01-15 04:13:42 19691 [Note] Shutting down plugin 'MEMORY'
2013-01-15 04:13:42 19691 [Note] Shutting down plugin 'MRG_MYISAM'
2013-01-15 04:13:42 19691 [Note] Shutting down plugin 'MyISAM'
2013-01-15 04:13:42 19691 [Note] Shutting down plugin 'sha256_password'
2013-01-15 04:13:42 19691 [Note] Shutting down plugin 'mysql_old_password'
2013-01-15 04:13:42 19691 [Note] Shutting down plugin 'mysql_native_password'
2013-01-15 04:13:42 19691 [Note] Shutting down plugin 'binlog'
2013-01-15 04:13:42 19691 [Note] /usr/sbin/mysqld: Shutdown complete

130115 04:13:42 mysqld_safe mysqld from pid file /var/lib/mysql/s16579201.onlinehome-server.info.pid ended