SSH鍵交換メモ ssh-copy-id使う

Linux 
// 鍵生成
$ ssh-keygen -t dsa -N '' -f ~/.ssh/id_dsa
$ ls .ssh/
id_rsa  id_rsa.pub

// リモートマシンに登録
$ ssh-copy-id -i ~/.ssh/id_dsa.pub ymko@192.168.1.10
26
The authenticity of host '192.168.1.10 (192.168.1.10)' can't be established.
RSA key fingerprint is xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.1.10' (RSA) to the list of known hosts.
ymko@192.168.1.10's password:
Now try logging into the machine, with "ssh 'ymko@192.168.1.10'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

// 通る！
$ ssh 192.168.1.8 ls .ssh/authorized_keys
.ssh/authorized_keys

$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
Permission denied, please try again.
// パスワード認証を許可していないとか、パスワードが間違っているとか。確認。

ゲストの時計設定

KVM 
# diff -Naur /etc/libvirt/qemu/arestrea.xml{.o,}
--- /etc/libvirt/qemu/arestrea.xml.o    2010-10-23 23:29:07.808356536 +0900
+++ /etc/libvirt/qemu/arestrea.xml      2010-10-24 01:48:04.080512727 +0900
@@ -13,7 +13,7 @@
     <apic/>
     <pae/>
   </features>
-  <clock offset='utc'/>
+  <clock offset='localtime'/>
   <on_poweroff>destroy</on_poweroff>
   <on_reboot>restart</on_reboot>
   <on_crash>restart</on_crash>

# virsh define /etc/libvirt/qemu/arestrea.xml
# ゲスト起動

再再々度入門

git 
// gcc と zlib-devel が必要
$ wget http://kernel.org/pub/software/scm/git/git-1.7.3.2.tar.bz2
$ tar xvfj git-1.7.3.2.tar.bz2
$ cd git-1.7.3.2
$ mkdir -p ~/usr/local
$ ./configure --prefix=$HOME/usr/local
$ make
$ make install
$ echo "PATH=\$PATH:\$HOME/usr/local/bin" >> ~/.bashrc

// 上記の.gitconfigをおもむろに貼りつけ(nameとmailは書き換える)
$ vi ~/.gitconfig
    • アプリ作成開始
$ mkdir remote_inst
$ cd !$
$ cat >test.pl
#!/usr/bin/perl

use strict;
use warnings;

print "hello world!\n";
exit 0;

// ローカルリポジトリ
$ git init
$ git add test.pl
$ git ci -m "first commit"

// リモートリポジトリ
$ ssh 192.168.1.8 mkdir -p  git/remote_inst.git
$ ssh 192.168.1.8 git --bare init git/remote_inst.git
Initialized empty Git repository in /home/nymph/git/remote_inst.git/

// リモートリポジトリはどこか登録
$ git remote add origin ssh://nymph@192.168.1.8/home/nymph/git/remote_inst.git
fatal: remote origin already exists.
// もう既に登録済みエラー。実験で作成したのが残っていたので削除する
$ git config -l | grep origin.url
remote.origin.url=ssh://nymph@192.168.1.8/tmp/remote_inst
$ git remote rm origin
// 改めて
$ git remote add origin ssh://nymph@192.168.1.8/home/nymph/git/remote_inst.git
// 送信！
$ git push origin master
Counting objects: 3, done.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 273 bytes, done.
Total 3 (delta 0), reused 0 (delta 0)
To ssh://nymph@192.168.1.8/home/nymph/git/remote_inst.git
 * [new branch]      master -> master

// できたかな？
$ mkdir ../tmp
$ cd !$
$ git clone ssh://nymph@192.168.1.8/home/nymph/git/remote_inst.git
Cloning into remote_inst...
remote: Counting objects: 3, done.
remote: Compressing objects: 100% (2/2), done.
remote: Total 3 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (3/3), done.
  • まとめ
    • とりあえず最低限覚えるのは以下2つ
      • git clone ssh://xxx@x.x.x.x/xxx/xxx/ # リモートリポジトリから取得する
      • git push origin master # リモートリポジトリに反映する
    • リモートリポジトリ管理する人は
    • リモートリポジトリは上記みたいな自分しかアクセスできないような場所じゃなくて/var/xxx/とか皆がアクセスできるところにする。
  • 追記 リモートリポジトリはこんな風にしてみた
# mkdir /var/git/
# chown root.users !$
# chmod 2770!$

$ ssh 192.168.1.8 mkdir /var/git/remote_inst.git
$ ssh 192.168.1.8 git init --bare --shared  /var/git/remote_inst.git
$ git remote add origin ssh://192.168.1.8/var/git/remote_inst.git
$ git push origin master
Counting objects: 3, done.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 273 bytes, done.
Total 3 (delta 0), reused 0 (delta 0)
To ssh://192.168.1.8/var/git/remote_inst.git
 * [new branch]      master -> master

virt-clone試してみた

KVM

先日作ったikaros(CentOS5.5)をコピー

# virt-clone --original ikaros --name nymph --file nymph.img
Cloning ikaros.img        100% |=========================| 2.0 GB    01:01

Clone 'nymph' created successfully.

// VM設定ファイルも出来てる
# diff -Naur /etc/libvirt/qemu/{ikaros.xml,nymph.xml}
--- /etc/libvirt/qemu/ikaros.xml        2010-10-23 01:24:34.527172445 +0900
+++ /etc/libvirt/qemu/nymph.xml 2010-10-23 21:35:02.843401503 +0900
@@ -1,6 +1,6 @@
 <domain type='kvm'>
-  <name>ikaros</name>
-  <uuid>4f83ff72-9f49-b76b-0415-e2fe12bbc6e7</uuid>
+  <name>nymph</name>
+  <uuid>22ad5503-5075-692d-b309-821d12237f2f</uuid>
   <memory>524288</memory>
   <currentMemory>524288</currentMemory>
   <vcpu>1</vcpu>
@@ -21,12 +21,12 @@
     <emulator>/usr/bin/kvm</emulator>
     <disk type='file' device='disk'>
       <driver name='qemu' type='qcow2'/>
-      <source file='/home2/ikaros.img'/>
+      <source file='/home2/nymph.img'/>
       <target dev='vda' bus='virtio'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
     </disk>
     <interface type='bridge'>
-      <mac address='52:54:00:e6:cf:b4'/>
+      <mac address='00:16:36:f7:93:36'/>
       <source bridge='br0'/>
       <model type='virtio'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>

//変更すべきところ
/etc/hosts
/etc/sysconfig/network
/etc/sysconfig/network/ifcfg-eth0
//あとユーザーを作るとか、rootのパスワード変えるとか・・
macアドレスは上記のVM設定ファイルから取ってVMのifcfg-eth0につける
useradd nymph -g users
    • 追記.MACアドレス違う場合はVMのネットワークが起動しない。
Bringing up interface eth0:  Device eth0 has different MAC address than expected, ignoring.
[FAILED]

# ifconfig eth0 | grep HWaddr | awk '{print $5}'
00:16:36:FC:F5:6C

# ifconfig eth0 | grep HWaddr | perl -ane 'print pop(@F), "\n"'
00:16:36:FC:F5:6C

↑perldoc perlrun の -a の説明参照