在Rhel 7 上配置tftp server

1. 首先是安装xinetd 和tftp server.

/root/ibm-yum.sh install tftp-server

2. 然后修改xinetd 的配置，tftp的配置文件是/etc/xinetd.d/tftp
需要把disable 修改成no.

cat /etc/xinetd.d/tftp
# default: off
# description: The tftp server serves files using the trivial file transfer \
#    protocol. The tftp protocol is often used to boot diskless \
#    workstations, download configuration files to network-aware printers, \
# and to start the installation process for some operating systems.
service tftp
{
    socket_type = dgram
    protocol = udp
    wait = yes
    user = root
    server = /usr/sbin/in.tftpd
    server_args = -s /var/lib/tftpboot
    disable = no
    per_source = 11
    cps = 100 2
    flags = IPv4
}
server_args = -s /var/lib/tftpboot 意思是tftp的目录是/var/lib/tftpboot
我在下面创建了一个文件。
echo "hello ,world ">> /var/lib/tftpboot/1.txt

3. 启动xinetd

systemctl start xinetd

4. 查看69端口已经被监听了。

netstat -tunlp |grep 69
tcp6       0      0 :::6988 :::* LISTEN      1681/cimlistener
udp        0      0 0.0.0.0:69              0.0.0.0:* 7901/xinetd

5.  从另外一台电脑登陆上,可以get 1.txt，证实这个tftp server 运行正常了。
6. 另外这是一些xinetd 的选项。

• disable

  Simply whether or not to run this service. Set it to "no" if you want to activate the service. Note that "enable = yes" doesn't work.

• socket_type

  Stream, dgram, raw, or seqpacket.

• wait

  Determines whether or not the service can accept multiple connections. If "yes", xinetd won't accept new connections for this service until the active one exits.

• user

  The user id for the process. Of course xinetd.d would have to be running as root to start with if you wanted it to be able to run a process as someone else.

• server

  The actual executable to run. Note this is NOT used to look up port numbers in /etc/services: it's the name of the file itself that is used for that lookup. So if xinetd sees a connection coming in on tcp port 23, it looks in /etc/services, finds that is "telnet", and then looks in the file "telnet" here to determine what to do. Note that there is a "port" attribute (not used here) that can be used if the service doesn't exist in /etc/services, but if it DOES exist, "port" needs to match.

• groups

  Don't confuse this with "group" (not used here) that would take a group name or id. What this determines is whether or not the service will have access to the supplementary groups that it would otherwise have from its effective id (from "user" above).

• flags

  There are a number of possible flag settings. Usually you'll see REUSE as above, which is somewhat amusing because that one isn't documented in the man page of some distributions. More amusing is that the reason it isn't documented is that it's a deprecated flag: that is the default now. Reuse lets you accept multiple connections to the same port.

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