DirectAdmin默认会安装WEB环境，装完的MYSQL没有给我们root密码，没法直接运行mysql_secure_installation。怎么办呢？
以下就是解决办法：
1.获得directadmin的mysql管理员密码。
路径是/usr/local/directadmin/conf/mysql.conf
2.利用mysql已经创建的MYSQL管理员账户重置ROOT密码。
mysql -u da_admin -p
mysql> SET PASSWORD FOR ‘root’@’localhost’ = PASSWORD(‘newpass’);
3.运行mysql_secure-installation
会提示输入root密码，输入你刚刚重置的密码即可。
PS：转载请注明出处，谢谢！
第一步：修改网卡信息
protime-linux:/etc/udev/rules.d# cat z25_persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, probably run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single line.
# MAC addresses must be written in lowercase.
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM==”net”, DRIVERS==”?*”, ATTRS{address}==”00:0c:29:15:3a:48″, NAME=”eth0″
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM==”net”, DRIVERS==”?*”, ATTRS{address}==”00:0c:29:15:3a:52″, NAME=”eth1″
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM==”net”, DRIVERS==”?*”, ATTRS{address}==”00:0c:29:af:1c:c7″, NAME=”eth2″
修改后：
protime-linux:/etc/udev/rules.d# cat z25_persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, probably run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single line.
# MAC addresses must be written in lowercase.
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM==”net”, DRIVERS==”?*”, ATTRS{address}==”00:0c:29:15:3a:48″, NAME=”eth2″
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM==”net”, DRIVERS==”?*”, ATTRS{address}==”00:0c:29:15:3a:52″, NAME=”eth1″
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM==”net”, DRIVERS==”?*”, ATTRS{address}==”00:0c:29:af:1c:c7″, NAME=”eth0″
#可以看到文件中的设置为动态IP的语句
iface eth0 inet dhcp
当然也可以设置为静态IP地址，如：
在 /etc/network/interfaces 中，删除 iface eth0 inet dhcp，添加一下内容
iface eth0 inet static
address 172.17.10.40
netmask 255.255.0.0
broadcast 172.17.0.255
network 172.17.0.0
gateway 172.17.10.100
重启网络
#/etc/init.d/networking restart