samba installation and setup
1. install
sudo apt-get install samba
sudo apt-get install smbfs
2. create user and directory
useradd testuser
smbpasswd -a testuser
mkdir /test/testdir
chown testuser /test/testdir
3. configure samba
vi /etc/samba/smb.conf, append the following line:
testuser = "user for testing"
vi /etc/samba/smb.conf, append the following line:
security = user
username map = /etc/samba/smbusers
usershare allow guests = yes
[testfolder]
path = /media/disk/testdir
public = no
writeable = yes
browseable = yes
4. (re)start samba
/etc/init.d/samba restart
using scp without inputing password
source: http://www.itpub.net/viewthread.php?tid=957234&extra=&page=2
1. On host A, generate the key.
#ssh-keygen -t rsa
QUOTE:
Enter file in which to save the key (/home/.username/ssh/id_rsa):#press return
Enter passphrase (empty for no passphrase):#press return
Enter same passphrase again:#press return
Your identification has been saved in /home/.username /.ssh/id_rsa.
Your public key has been saved in /home/.username /.ssh/id_rsa.pub.
The key fingerprint is:
38:25:c1:4d:5d:d3:89:bb:46:67:bf:52:af:c3:17:0c username@localhost
Generating RSA keys:
Key generation complete.
There is 2 files generated in ~/.ssh/ : id_rsa，id_rsa.pub
2. copy the content of id_rsa.pub (just 1 line) on host A to the file ~/.ssh/authorized_keys on host B.
3. now you can use scp on host A to access host B without being asked for password.
Note: The file id_rsa on host A must be kept.
linux下网卡有eth1却没有eth0
背景：使用virtualbox虚拟的linux，本来只有一个eth0，其硬盘镜像文件被重用于新建的另一个虚拟机后，eth0没了，出来一个eth1。
原因：系统对探测到的网卡的MAC地址进行记录，并为该MAC地址分配一个interface编号，记录在配置文件中。镜像文件重用于新建虚拟机后，新建网卡MAC地址是随机分配的，所以与以前的MAC地址不一样，系统为该网卡分配新的interface编号，并在配置文件中添加新记录。
如果想修改interface编号，可以通过修改配置文件并重启。
grep "eth1" /etc/udev/rule.d/*
踢出用户
linux 下踢出一个用户
pkill -KILL -t pts/0
-t的参数可以通过w命令得到
tftp/ftp等服务器的安装
这些都是inetutils工具的一部分。
inetutils-1.5在2.6.32.27下工作不正常，不能接受外部tftp请求。
inetutils-1.9.2和1.9.3都没问题，且可以支持带802.1q vlan tag的端口。
下载链接：ftp://ftp.gnu.org/gnu/inetutils/
如果./configure的时候不加参数，则make;make install后，
只需要增加一个文件：/etc/inetd.conf，内容如下：
tftp dgram udp wait root /usr/local/libexec/tftpd -l /boot
启动inetd即可：/usr/local/libexec/inetd，无需单独启动具体服务