= 2008-09-25 =

 * [課程] DRBL/Clonezilla 進階課程
   * [小問題] 顯示卡自動偵測到解析度是 1280x768 但是接到 4:3 的螢幕
{{{
00:02.0 VGA compatible controller: Intel Corporation 82Q963/Q965 Integrated Graphics Controller (rev 02)
}}}
 * Ubuntu 8.04 常見 DRBL 安裝問題
   * [[Image(linux-image-2.6.24_not_found.png)]]
   * 修改 patch
{{{
#!diff
--- /opt/drbl/sbin/drblsrv.org	2008-09-25 10:32:04.000000000 +0800
+++ /opt/drbl/sbin/drblsrv	2008-09-25 10:53:21.000000000 +0800
@@ -3440,7 +3440,7 @@
     if [ $rc_get_kernel -gt 0 ]; then
       [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
       echo "$latest_drbl_kernel_in_rep can NOT be downloaded!!! Something went wrong!"
-      echo "Maybe you should check /etc/sources.list or remove the unnecessary kernel block in /var/lib/dpkg/status so that "apt-cache pkgnames $kernel_img_name" can get the downloadable kernel! Then try to run this program again."
+      echo "Maybe you should check /etc/apt/sources.list or remove the unnecessary kernel block in /var/lib/dpkg/status so that "apt-cache pkgnames $kernel_img_name" can get the downloadable kernel! Then try to run this program again."
       echo "Program terminated!!!"
       [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
       exit 1
@@ -4014,7 +4014,7 @@
       if [ $RC -gt 0 ]; then
         [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
         echo "$latest_drbl_kernel_in_rep can NOT be downloaded!!! Something went wrong!"
-        echo "Maybe you should check /etc/sources.list so that "apt-cache pkgnames $kernel_img_name" can get the downloadable kernel! Then try to run this program again."
+        echo "Maybe you should check /etc/apt/sources.list so that "apt-cache pkgnames $kernel_img_name" can get the downloadable kernel! Then try to run this program again."
         echo "Program terminated!!!"
         [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
         exit 1
}}}
 * [備忘] Ubuntu 沒有 root 預設密碼，雖然有 sudo ，但 sudo 有兩個的困擾：
   * (1) 時間問題(sudo timeout): NTP更新或手動改時間的時候會造成
   * (2) hostname 問題: 如果有改 hostname, sudo 也會失效
 * [小問題] Windows XP 是 FAT32 格式必須轉換到 NTFS 格式
{{{
convert d: /FS:NTFS 
convert c: /FS:NTFS
}}}
 * [備忘] 本機加完使用者之後，必須手動跑 YP 的帳號更新
{{{
# make -C /var/yp
}}}
 * [備忘] 更新 Netboot Image 
{{{
# /opt/drbl/sbin/mknic-nbi
}}}
   * [密技] 如果想要自己加東西到 pxe-initrd 的 initial RAMDisk 的話，可以改 /usr/lib/mkpxeinitrd-net/initrd-skel 的內容，例如想要加 NFSv4 或者把 Lustre、AoE、iSCSI 的網路硬碟，可以改 /usr/lib/mkpxeinitrd-net/initrd-skel/sbin/udhcpc-post 這些程序。
 * [備忘] 為什麼 DRBL Client 的 /root 與 DRBL Server 的 /root 是各自獨立的呢?
   * DRBL Client 的 /root : /tftpboot/nodes/$IP/root
 * [備忘] dcs re-deploy 就是跑 drblpush -c /etc/drbl/drblpush.conf
 * [備忘] DRBL 的更新原則: 如果是 df 顯示出來的目錄讀寫權限是 RW，請重新跑 drblpush (re-deploy) 或用 drbl-cp-host 強制複製到每一台 DRBL Client。drblpush 更新方法包含 rsync 跟直接覆蓋兩種。
 * [備忘] 在 Linux 底下查 BIOS 裡面的 UUID 可以用 [http://packages.debian.org/etch/dmidecode dmidecode] 套件的 dmidecode 指令，這個 UUID 就可以給 /tftpboot/nbi_img/pxelinux.cfg/ 指定特定機器的 pxelinux 設定用
   * [參考] [http://www.cyberciti.biz/tips/querying-dumping-bios-from-linux-command-prompt.html Get Information About Your BIOS / Server Hardware From a Shell Without Opening Chassis ( BIOS Decoder )]
   * [參考] [http://www.linux.com/articles/40412 dmidecode: What's it good for?]
{{{
root@drbl-xen-srv:~# dmidecode | grep UUID
        UUID: 564DA03C-37F5-D7DE-386D-CEF0191D96DC
}}}
 * [小技巧] 要查 TFTP Server 的互動要求，可以把 /etc/default/tftpd-hpa 裡的 OPTIONS 加上 -v 參數
{{{
#!diff
--- /etc/default/tftpd-hpa
+++ /etc/default/tftpd-hpa
@@ -2,1 +2,1 @@
- OPTIONS="-l -s /tftpboot/nbi_img"
+ OPTIONS="-l -v -v -v -s /tftpboot/nbi_img"
}}}
   * 打開 logging verbosity 之後，重新啟動 
{{{
# /etc/init.d/tftpd-hpa restart
}}}
   * 從/var/log/daemon.log 可以看到 DRBL Client 送過來的 UUID
 * [小技巧] 把 /etc/dhcp3/dhcpd.conf 裡的 log 設定前的 mark 拿掉
{{{
#!diff
--- /etc/dhcp3/dhcpd.conf
+++ /etc/dhcp3/dhcpd.conf
@@ -37,9 +37,9 @@
- #log(info, concat("Client ",
- #        binary-to-ascii(16, 8, ":", substring(hardware, 1, 6)),
- #        " requests ",
- #        binary-to-ascii(16, 8, ":", option dhcp-parameter-request-list),
- #        " - ",
- #        pick-first-value(option vendor-class-identifier, "no vendor-id"),
- #        " - ",
- #        pick-first-value(option dhcp-client-identifier, "no dhcp-client-id"))
- #   );
+ log(info, concat("Client ",
+         binary-to-ascii(16, 8, ":", substring(hardware, 1, 6)),
+         " requests ",
+         binary-to-ascii(16, 8, ":", option dhcp-parameter-request-list),
+         " - ",
+         pick-first-value(option vendor-class-identifier, "no vendor-id"),
+         " - ",
+         pick-first-value(option dhcp-client-identifier, "no dhcp-client-id"))
+    );
}}}
   * 打開 dhcpd log 之後，重新啟動 dhcpd
{{{
# /etc/init.d/dhcp3-server restart
}}}
   * 就可以在 /var/log/daemon.log 裡看到 DHCP Server 與 DHCP Client 互動的過程
{{{
Sep 25 13:04:51 drbl-server dhcpd: DHCPDISCOVER from 00:0f:fe:5e:4b:f8 via eth1
Sep 25 13:04:52 drbl-server dhcpd: DHCPOFFER on 192.168.100.3 to 00:0f:fe:5e:4b:f8 via eth1
Sep 25 13:04:53 drbl-server dhcpd: DHCPREQUEST for 192.168.100.3 (192.168.100.254) from 00:0f:fe:5e:4b:f8 via eth1
Sep 25 13:04:53 drbl-server dhcpd: DHCPACK on 192.168.100.3 to 00:0f:fe:5e:4b:f8 via eth1
Sep 25 13:04:53 drbl-server in.tftpd[19982]: RRQ from 192.168.100.3 filename pxelinux.0 
Sep 25 13:04:53 drbl-server in.tftpd[19982]: tftp: client does not accept options 
Sep 25 13:04:53 drbl-server in.tftpd[19983]: RRQ from 192.168.100.3 filename pxelinux.0 
Sep 25 13:04:53 drbl-server in.tftpd[19984]: RRQ from 192.168.100.3 filename pxelinux.cfg/de568b5e-d92a-dc11-bbda-fe5e4bf8000f 
Sep 25 13:04:53 drbl-server in.tftpd[19984]: sending NAK (1, File not found) to 192.168.100.3
Sep 25 13:04:53 drbl-server in.tftpd[19985]: RRQ from 192.168.100.3 filename pxelinux.cfg/01-00-0f-fe-5e-4b-f8 
Sep 25 13:04:53 drbl-server in.tftpd[19985]: sending NAK (1, File not found) to 192.168.100.3
Sep 25 13:04:53 drbl-server in.tftpd[19986]: RRQ from 192.168.100.3 filename pxelinux.cfg/C0A86403 
Sep 25 13:04:53 drbl-server in.tftpd[19986]: sending NAK (1, File not found) to 192.168.100.3
Sep 25 13:04:53 drbl-server in.tftpd[19987]: RRQ from 192.168.100.3 filename pxelinux.cfg/C0A8640 
Sep 25 13:04:53 drbl-server in.tftpd[19987]: sending NAK (1, File not found) to 192.168.100.3
Sep 25 13:04:53 drbl-server in.tftpd[19988]: RRQ from 192.168.100.3 filename pxelinux.cfg/C0A864 
Sep 25 13:04:53 drbl-server in.tftpd[19988]: sending NAK (1, File not found) to 192.168.100.3
Sep 25 13:04:53 drbl-server in.tftpd[19989]: RRQ from 192.168.100.3 filename pxelinux.cfg/C0A86 
Sep 25 13:04:53 drbl-server in.tftpd[19989]: sending NAK (1, File not found) to 192.168.100.3
Sep 25 13:04:53 drbl-server in.tftpd[19990]: RRQ from 192.168.100.3 filename pxelinux.cfg/C0A8 
Sep 25 13:04:53 drbl-server in.tftpd[19990]: sending NAK (1, File not found) to 192.168.100.3
Sep 25 13:04:53 drbl-server in.tftpd[19991]: RRQ from 192.168.100.3 filename pxelinux.cfg/C0A 
Sep 25 13:04:53 drbl-server in.tftpd[19991]: sending NAK (1, File not found) to 192.168.100.3
Sep 25 13:04:53 drbl-server in.tftpd[19992]: RRQ from 192.168.100.3 filename pxelinux.cfg/C0 
Sep 25 13:04:53 drbl-server in.tftpd[19992]: sending NAK (1, File not found) to 192.168.100.3
Sep 25 13:04:53 drbl-server in.tftpd[19993]: RRQ from 192.168.100.3 filename pxelinux.cfg/C 
Sep 25 13:04:53 drbl-server in.tftpd[19993]: sending NAK (1, File not found) to 192.168.100.3
Sep 25 13:04:53 drbl-server in.tftpd[19994]: RRQ from 192.168.100.3 filename pxelinux.cfg/default 
Sep 25 13:04:53 drbl-server in.tftpd[19995]: RRQ from 192.168.100.3 filename menu.c32 
Sep 25 13:04:53 drbl-server in.tftpd[19996]: RRQ from 192.168.100.3 filename pxelinux.cfg/default 
Sep 25 13:05:12 drbl-server in.tftpd[20001]: RRQ from 192.168.100.3 filename vmlinuz-pxe 
Sep 25 13:05:12 drbl-server in.tftpd[20002]: RRQ from 192.168.100.3 filename initrd-pxe.img 
}}}