perl , ssh2 , vyatta , vbash and remote executio

perl , ssh2 , vyatta , vbash and remote executio

如何使用 perl 寫一支 shell 連入 vyatta OS 內,並下指令 show ????,
並將 結果 自動以 E-Mail 方式寄回給網管人員!

About vyatta

www.vyatta.com or www.vyatta.org

or 我以前發表過的文章如下:
http://www.pczone.com.tw/vbb3/thread/16/147986/


程式範列如下,可依需要自行修改之:

 [xrcd2@centos shell]# cat ssh2-vyatta-show.pl
    
#!/usr/bin/perl
use Net::SSH2;
$ssh=Net::SSH2->new() or die "couldn't make SSH object\n";
#$ssh->debug(1);
$ssh->blocking(1);
print "\n made SSH object\n";
$ssh->connect('xxx.xxx.xxx.xxx') or die "couldn't connect to host\n";
print "\n connected to vyatta-host\n";
$ssh->auth_password('vyatta-id','vyatta-pwd') or die "couldn't authenticate \n";
print "\n \n authenticated vyatta-id \n \n";
print " \n ================== send command ====================== \n ";
$command1 = $ssh->channel();
$command1->exec('vbash -i -c "show version "');
$buflen = 10000;
$show = '0' x $buflen;
$command1->read($show, $buflen);
chomp($show);
print "\n $show";
print " \n \n  =================  end  ============================== \n \n ";

$ssh->disconnect or die "couldn't disconnect\n";

get_mail();

sub get_mail{
 use Encode qw(decode encode_utf8);
 use Encode qw(encode);
 use MIME::Base64;
 use MIME::Lite;
 $foot0=' 自動使用SSH2 到 Vyatta OS 的 Shell ( ssh2 vyatta vbash )  ';
 use Encode qw/from_to/;
 from_to($foot0, "utf8", "big5");
 $line='=====================================================';

 $msg = MIME::Lite->new(
     From     =>'vyatta@xrcd2.com.tw',
     To       =>'xrcd2@xrcd2.com.tw',
     Subject => "show vyatta version ",
     Encoding => 'base64',
     Data     =>"$foot0 \n\n $line \n\n $show \n\n $line\n\n"
 );
 $msg->get_length;
 $msg->attr("content-type.charset" => "UTF8");
 $msg->send('smtp','x.x.x.x');
 print $Mail::SendMail::Error eq "" ? "\n\n send ok! \n\n" : $Mail::SendMail::Error;
}

[root@centos63 shell]# perl  blog-ssh.pl
      
 made SSH object

 connected to vyatta-host


 authenticated vyatta-id


 ================== send command ======================

 Version:      VC6.5R1
Description:  Vyatta Core 6.5 R1
Copyright:    2006-2012 Vyatta, Inc.
Built by:     autobuild@vyatta.com
Built on:     Fri Nov 16 16:39:16 UTC 2012
Build ID:     1211161646-334fb58
System type:  Intel 32bit
Boot via:     disk
Hypervisor:   VMware
HW model:     VMware Virtual Platform
HW S/N:       VMware-56 4d 5b da 3e 1c d1 93-43 38 03 40 4a 5c e9 29
HW UUID:      564D5BDA-3E1C-D193-4338-03404A5CE929
Uptime:       16:58:35 up  2:11,  1 user,  load average: 0.00, 0.01, 0.05


  =================  end  ==============================
 
send ok!
 [xrcd2@centos shell]#

簡單的 linux H.A 架構 keepalived (linux vrrp) Part II

透過 keepalived 達成簡單的 linux H.A 架構. (linux vrrp)
http://www.keepalived.org/
延續這個主題.
http://xrcd2.blogspot.tw/2013/04/linux-ha-keepalived-linux-vrrp.html
加入切換條件, 如 track_script































Master config 如下

! Configuration File for keepalived
vrrp_script check_sh {
    script "/etc/keepalived/chk_ftp.sh"
    interval 2                       # check every 2 seconds
    weight -30                       # default prio: -30
    fall 2                           # require 2 failures
    rise 2                           # require 2 successes
}
vrrp_script chk_httpd {
            script "killall -0 httpd"      
            interval 2                    
            weight -30                      
            fall 2                         
            rise 2                         
}
vrrp_script chk_8080_port {
 script "</dev/tcp/127.0.0.1/8080"
 interval 1
 weight -30
 fall   2    
 rise   2    
}
global_defs {
   notification_email {
     xrcd2@xrcd2.com.tw
   }
   notification_email_from keepalived@xrcd2.com.tw
   smtp_server 192.168.1.100
   smtp_connect_timeout 30
   router_id NodeA
}
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 1
    priority 100
    advert_int 1
    smtp_alert
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.3
    }
    track_script {
     check_sh
     chk_httpd
     chk_8080_port
    }
    track_interface{
     eth0   
    }

}

DIY 檢查的 shell
======================
cat /etc/keepalived/chk_ftp.sh
#!/bin/bash
chktcp21=`nmap 127.0.0.1 | grep '21/tcp' | wc -l`
if [ $chktcp21 = 1 ]
then
 #echo "============="
 #echo " FTPD Is Up "
 #echo "============="
 exit 0
else
 #echo "============="
 #echo " FTPD Is Down "
 #echo "============="
 exit 1
fi
=====================

Backup config 如下

! Configuration File for keepalived
vrrp_script check_sh {
    script "/etc/keepalived/chk_ftp.sh"
    interval 2                      # check every 2 seconds
    weight -30                      # default prio: -30
    fall 2                          # require 2 failures
    rise 2                          # require 2 successes
}
vrrp_script chk_httpd {
            script "killall -0 httpd"       
            interval 2                     
            weight -30                     
            fall 2                          
            rise 2                          
}
vrrp_script chk_8080_port {
 script "</dev/tcp/127.0.0.1/8080"
 interval 1
 weight -30
 fall   2   
 rise   2   
}
global_defs {
   notification_email {
     xrcd2@xrcd2.com.tw
   }
   notification_email_from keepalived@xrcd2.com.tw
   smtp_server 192.168.1.100
   smtp_connect_timeout 30
   router_id NodeB
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 1
    priority 90
    advert_int 1
    smtp_alert
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.3
    }
    track_script {
     check_sh
     chk_httpd
     chk_8080_port
    }
    track_interface{
     eth0   
    }

}

運作通知!

切換通知!