linux diskless

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1, setup dnsmasq

/etc/dnsmasq.conf

interface=eth2 // connected to the dhcp client
dhcp-range=192.168.2.50,192.168.2.150,255.255.255.0,12h
dhcp-option=3,192.168.2.1
expand-hosts
dhcp-boot=pxelinux.0,192.168.2.1,192.168.2.1 // pxelinux.0 -> yum install syslinux
enable-tftp
tftp-root=/home/tftp-root // tftp directory, chmod 777

dhcp-host=00:1d:7d:43:90:d1,192.168.2.10 // bind the dhcp client's mac address to 192.168.2.10

2, iptable打开67，68，69端口

/etc/sysconfig/iptables

-A INPUT -m state --state NEW -m udp -p udp --dport 69 -j ACCEPT

-A INPUT -m state --state NEW -m udp -p udp --dport 68 -j ACCEPT

-A INPUT -m state --state NEW -m udp -p udp --dport 67 -j ACCEPT

3, setup nfs

/etc/export

/home/tftp-root/192.168.2.10 192.168.2.1/24(insecure,rw,sync,no_root_squash,no_all_squash)

4, setup tftp setting

/home/tftp-root:

-rwxrwxrwx 1 root root 26828 Sep 1 13:44 pxelinux.0

drwxrwxrwx 2 root root 4096 Sep 8 16:17 pxelinux.cfg

-rw-r--r-- 1 root root 274 Sep 8 16:05 C0A8020A

default 2.6.32
timeout 3

               label           2.6.32
               kernel          192.168.2.10/vmlinuz
               append ip=192.168.2.10:192.168.2.1:192.168.2.1:255.255.255.0:diskless:eth0:off root=/dev/nfsroot rw enforcing=0 nfsroot=192.168.2.1:/home/tftp-root/192.168.2.10

drwxrwxrwx 13 root root 4096 Sep 8 16:32 192.168.2.10

-rw-r--r-- 1 root root 4710128 Sep 8 16:26 vmlinuz

5, compile linux kernel

Code maturity level options  --->  [*] Prompt for development and/or incomplete code/drivers  Device Drivers --->  [*] Networking support  Networking options --->    <*> Packet socket    <*> Unix domain sockets    [*] TCP/IP networking    [*]   IP: multicasting    [*]   IP: kernel level autoconfiguration    [*]     IP: DHCP support (NEW)Networking support  --->

  Networking options  --->

  [*]   IP: kernel level autoconfiguration                          [*]     IP: DHCP support                          [*]     IP: BOOTP support

File systems --->  Network File Systems  --->    <*> file system support    [*]   Provide NFSv3 client support    [*]   Root file system on NFS

* the most import things is that the device driver of dhcp client network adaptor should be include the kernel, not module.