Now logging …

編集前
[root@mx-ns ~]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 192.168.3.1
[root@mx-ns ~]#

vi エディタで編集後
[root@mx-ns ~]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 192.168.3.21
[root@mx-ns ~]#

OSリブート後
[root@mx-ns ~]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 192.168.3.1
[root@mx-ns ~]#

DEVICE=eth0
TYPE=Ethernet
UUID=a31cbd35-6ff3-456c-ad14-2e2a765e9e9a
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
HWADDR=00:15:5D:03:04:05
IPADDR=192.168.3.21
PREFIX=24
GATEWAY=192.168.3.1ｄ
DNS1=192.168.3.1
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"

[root@mx-ns network-scripts]# chkconfig --list NetworkManager
サービス NetworkManager に関する情報の読み込み中にエラーが発生しました: そのようなファイルやディレクトリはありません
[root@mx-ns network-scripts]#

[root@mx-ns network-scripts]# cat ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
UUID=a31cbd35-6ff3-456c-ad14-2e2a765e9e9a
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
HWADDR=00:15:5D:03:04:05
IPADDR=192.168.3.21
PREFIX=24
GATEWAY=192.168.3.1
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
[root@mx-ns network-scripts]#

[root@mx-ns network-scripts]# service network restart
インターフェース eth0 を終了中:                            [  OK  ]
ループバックインターフェースを終了中                       [  OK  ]
ループバックインターフェイスを呼び込み中                   [  OK  ]
インターフェース eth0 を活性化中:  Determining if ip address 192.168.3.21 is already in use for device eth0...
                                                           [  OK  ]
[root@mx-ns network-scripts]#

[root@mx-ns network-scripts]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 192.168.3.21
search simalab.com
[root@mx-ns network-scripts]#

[root@mx-ns network-scripts]# reboot

[root@mx-ns ~]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 192.168.3.21
search simalab.com
[root@mx-ns ~]#

[root@mx-ns ~]# vi /etc/selinux/config
#下記に変更
SELINUX=disabled

[root@mx-ns ~]# 再起動実施
[root@mx-ns ~]# reboot

[root@mx-ns ~]# 再起動後確認
[root@mx-ns ~]# getenforce
Disabled
[root@mx-ns ~]#

[root@mx-ns ~]# service iptables stop
iptables: チェインをポリシー ACCEPT へ設定中filter         [  OK  ]
iptables: ファイアウォールルールを消去中:                  [  OK  ]
iptables: モジュールを取り外し中:                          [  OK  ]
[root@mx-ns ~]#
[root@mx-ns ~]# chkconfig iptables off
[root@mx-ns ~]# chkconfig --list iptables
iptables        0:off   1:off   2:off   3:off   4:off   5:off   6:off
[root@mx-ns ~]#

gem install rails --version="4.1.0"

〜略〜
Installing ri documentation for tzinfo-1.2.2
Done installing documentation for actionmailer, actionpack, actionview, activemodel, activerecord, activesupport, arel, builder, bundler, concurrent-ruby, i18n, mail, minitest, polyglot, rack, rack-test, rails, railties, sprockets, sprockets-rails, thread_safe, treetop, tzinfo after 1270 seconds
23 gems installed

gem install rails ---no-ri --no-rdoc

[root@Linux ~]# cd /var/
[root@Linux var]# rails new ip_manage -d mysql

[root@Linux config]#  cd config
[root@Linux config]# ls
application.rb  database.yml    environments  locales    secrets.yml
boot.rb         environment.rb  initializers  routes.rb
[root@Linux config]# vi database.yml

#
default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: パスワード直書き

# rake db:create

rake aborted!
Bundler::GemRequireError: There was an error while trying to load the gem 'uglifier'.

#vi /var/ip_manage/Gemfile
gem 'therubyracer',  platforms: :ruby ※先頭のコメント外す

# rake db:create

Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your 
Gemfile (and ensure its version is at the minimum required by ActiveRecord).

[root@Linux config]# gem install mysql2

[root@Linux config]# gem search --local mysql2
*** LOCAL GEMS ***
mysql2 (0.4.3)
[root@Linux config]# 

# rake db:create

Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your 
Gemfile (and ensure its version is at the minimum required by ActiveRecord).

[root@Linux config]# gem install mysql2 -v '0.3.20' 

[root@Linux config]# vi /var/ip_manage/Gemfile
gem 'mysql2', '~> 0.3.20'※左記のように書き換える

[root@Linux config]# rake db:create
(in /var/ip_manage)
[root@Linux config]#

mysql> show databases;
+-----------------------+
| Database              |
+-----------------------+
| ip_manage_development |
+-----------------------+

[root@Linux config]#  rails s
=> Booting WEBrick
=> Rails 4.1.0 application starting in development on http://0.0.0.0:3000
=> Run `rails server -h` for more startup options
=> Notice: server is listening on all interfaces (0.0.0.0). Consider using 127.0.0.1 (--binding option)
=> Ctrl-C to shutdown server
[2016-03-06 17:41:55] INFO  WEBrick 1.3.1
[2016-03-06 17:41:55] INFO  ruby 2.1.2 (2014-05-08) [i686-linux]
[2016-03-06 17:41:55] INFO  WEBrick::HTTPServer#start: pid=7407 port=3000

example.com. IN TXT "v=spf1 +ip4:100.AAA.0.1 +ip4:200.BBB.0.1 ~all"

+a:example.com

+mx:example.com

+ptr:example.com

+ip4:100.AA.0.0/30

+a/30

example.com.  IN TXT "v=spf1 -all"

example.com.  IN TXT "v=spf1 +a:msa.example.com +mx ~all"

$dig @DNSサーバのIPアドレス　example.com TXT