= 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
{{{
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 
 * [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"))
+    );
}}}