= 2011-06-04 =

== Browser OS ==

 * [http://webian.org/shell/ Webian Shell] - A full screen web browser for devices that don't need a desktop.
  * 有點像 Google Chrome OS 的計畫，源自 Mozilla 基金會的 Chromeless 計畫 - http://mozillalabs.com/chromeless
 
== Chukwa ==

 * [http://wiki.apache.org/hadoop/Chukwa_Quick_Start Chukwa Quick Start]

== Security ==

 * [http://www.howtoforge.com/securing-ssh-on-ubuntu-with-wikid-two-factor-authentication Securing SSH On Ubuntu With WiKID Two-Factor Authentication]

== Ganglia ==

 * 參考 [wiki:jazz/11-02-10 2011-02-10] 的設定，不過卻只顯示一台。重新啟動 hadoop.nchc.org.tw
 * /etc/ganglia/gmond.conf
{{{
#!diff
--- gmond.conf.dpkg	2011-06-04 22:04:55.000000000 +0800
+++ gmond.conf	2011-06-04 22:02:53.000000000 +0800
@@ -18,30 +18,31 @@
  * of a <CLUSTER> tag.  If you do not specify a cluster tag, then all <HOSTS> will 
  * NOT be wrapped inside of a <CLUSTER> tag. */ 
 cluster { 
-  name = "unspecified" 
-  owner = "unspecified" 
+  name = "hadoop" 
+  owner = "NCHC" 
   latlong = "unspecified" 
-  url = "unspecified" 
+  url = "http://hadoop.nchc.org.tw" 
 } 
 
 /* The host section describes attributes of the host, like the location */ 
 host { 
-  location = "unspecified" 
+  location = "Taichung" 
 } 
 
 /* Feel free to specify as many udp_send_channels as you like.  Gmond 
    used to only support having a single channel */ 
 udp_send_channel { 
-  mcast_join = 239.2.11.71 
+#  mcast_join = 239.2.11.71 
+  host = hadoop
   port = 8649 
-  ttl = 1 
+#  ttl = 1 
 } 
 
 /* You can specify as many udp_recv_channels as you like as well. */ 
 udp_recv_channel { 
-  mcast_join = 239.2.11.71 
+#  mcast_join = 239.2.11.71 
   port = 8649 
-  bind = 239.2.11.71 
+#  bind = 239.2.11.71 
 } 
}}}
 * /etc/ganglia/gmeta.conf
{{{
#!diff
--- gmetad.conf.dpkg	2011-06-04 22:04:44.000000000 +0800
+++ gmetad.conf	2011-06-04 22:02:46.000000000 +0800
@@ -1,7 +1,7 @@
 # This is an example of a Ganglia Meta Daemon configuration file
 #                http://ganglia.sourceforge.net/
 #
-# $Id: gmetad.conf.in 1639 2008-08-09 23:30:32Z carenas $
+# $Id: gmetad.conf.in 2014 2009-08-10 10:44:09Z d_pocock $
 #
 #-------------------------------------------------------------------------------
 # Setting the debug_level to 1 will keep daemon in the forground and
@@ -36,7 +36,7 @@
 # data_source "my grid" 50 1.3.4.7:8655 grid.org:8651 grid-backup.org:8651
 # data_source "another source" 1.3.4.7:8655  1.3.4.8
 
-data_source "my cluster" localhost
+data_source "hadoop" hadoop 192.168.1.1 192.168.1.2 192.168.1.3 192.168.1.4 192.168.1.5 192.168.1.6 192.168.1.7 192.168.1.8 192.168.1.9 192.168.1.10 192.168.1.11 192.168.1.12 192.168.1.13 192.168.1.14 192.168.1.15 192.168.1.16 192.168.1.17 192.168.1.18 192.168.1.19 192.168.1.20
 
 #
 # Round-Robin Archives
@@ -75,6 +75,9 @@
 # is always trusted. 
 # default: There is no default value
 # trusted_hosts 127.0.0.1 169.229.50.165 my.gmetad.org
+
+trusted_hosts 127.0.0.1 192.168.1.1 192.168.1.2 192.168.1.3 192.168.1.4 192.168.1.5 192.168.1.6 192.168.1.7 192.168.1.8 192.168.1.9 192.168.1.10 192.168.1.11 192.168.1.12 192.168.1.13 192.168.1.14 192.168.1.15 192.168.1.16 192.168.1.17 192.168.1.18 192.168.1.19 192.168.1.20
+
 #
 #-------------------------------------------------------------------------------
 # If you want any host which connects to the gmetad XML to receive
@@ -112,3 +115,14 @@
 # Where gmetad stores its round-robin databases
 # default: "/var/lib/ganglia/rrds"
 # rrd_rootdir "/some/other/place"
+#
+#-------------------------------------------------------------------------------
+# In earlier versions of gmetad, hostnames were handled in a case
+# sensitive manner
+# If your hostname directories have been renamed to lower case,
+# set this option to 0 to disable backward compatibility.
+# From version 3.2, backwards compatibility will be disabled by default.
+# default: 1   (for gmetad < 3.2)
+# default: 0   (for gmetad >= 3.2)
+case_sensitive_hostnames 1
+
}}}
 * 不過原本有把每一台 DRBL Client 的 gmond.conf 關於 host 的部份改為每一台的 hostname。不成功～

{{{
#!graphviz
digraph G {
  subgraph cluster_1 {
    node [style=filled];
    gmond -> gmetad;
    gmond -> gmond;
    label = "hadoop";
    color=blue
  }
  subgraph cluster_2 {
    node [style=filled];
    gmond1 -> gmond1;
    label = "hadoop101";
    color=red
  }
  subgraph cluster_3 {
    node [style=filled];
    gmond2 -> gmond2;
    label = "hadoop102";
    color=yellow
  }
  subgraph cluster_4 {
    node [style=filled];
    gmond3 -> gmond3;
    label = "hadoop103";
    color=green
  }
  gmond1 -> gmetad;
  gmond2 -> gmetad;
  gmond3 -> gmetad;
}
}}}
 * 現在反而把每台的 gmond.conf 改成 host = hadoop 就會成功。

{{{
#!graphviz
digraph G {
  subgraph cluster_1 {
    node [style=filled];
    gmond -> gmetad;
    label = "hadoop";
    color=blue
  }
  subgraph cluster_2 {
    node [style=filled];
    gmond1 -> gmond;
    gmond -> gmond;
    label = "hadoop101";
    color=red
  }
  subgraph cluster_3 {
    node [style=filled];
    gmond2 -> gmond;
    label = "hadoop102";
    color=yellow
  }
  subgraph cluster_4 {
    node [style=filled];
    gmond3 -> gmond;
    label = "hadoop103";
    color=green
  }
}
}}}