Entries from August 2008 ↓

Nagios check_mailq: is not executable by uid 0

August 26th, 2008 — Linux

If you receive this error then your plugin needs patching:

ERROR:  is not executable by (uid 0:gid(0 10 6 4 3 2 1 0))

The patch:

--- /usr/lib/nagios/plugins/check_mailq 2007-04-20 23:14:48.000000000 +0300
+++ check_mailq 2007-06-04 11:53:06.000000000 +0300
@@ -40,7 +40,7 @@
 sub print_usage ();
 sub process_arguments ();
 
-$ENV{'PATH'}='';
+$ENV{'PATH'}='/bin:/usr/bin';
 $ENV{'BASH_ENV'}='';
 $ENV{'ENV'}='';
 $PROGNAME = "check_mailq";
@@ -49,6 +49,9 @@
 $msg_p = 0 ;
 $state = $ERRORS{'UNKNOWN'};
 
+# 
+$utils::PATH_TO_QMAIL_QSTAT = "/var/qmail/bin/qmail-qstat";
+
 Getopt::Long::Configure('bundling');
 $status = process_arguments();
 if ($status){
@@ -63,7 +66,6 @@
 alarm($opt_t);
 
 # switch based on MTA
-
 if ($mailq eq "sendmail") {
 
        ## open mailq

12 Comments

Plesk password recovery

August 25th, 2008 — Linux, Plesk

If you forgot your admin password in Plesk, you’ll need to connect to your server with ssh and you can find the password in the file /etc/psa/.psa.shadow .

[root@apollo ~]# cat /etc/psa/.psa.shadow
<admin_pass>

To find mailbox’s password in Plesk, connect to your server with ssh, then use the following SQL query to reveal mailbox password (replace MAILBOX_NAME with your mailbox name):

[root@apollo ~]# mysql -u admin -p`cat /etc/psa/.psa.shadow` psa
[...]
mysql> SELECT m.mail_name, d.name, a.password FROM mail AS m LEFT JOIN (domains AS d, accounts AS a) \
ON (m.dom_id = d.id AND m.account_id = a.id) WHERE m.mail_name='MAILBOX_NAME'

3 Comments

Howto install RMagick on CentOS 4

August 25th, 2008 — Linux, Ruby

RMagick is an interface between the Ruby programming language and the ImageMagick® and GraphicsMagick image processing libraries.

To install RMagick on CentOS 4 you’ll need to install RMagick version 1 because version 2 requires newer version of ImageMagick that’s not available in CentOS 4 repositories.

I do assume that you already have installed RubyGems. If not, then read my post Install RubyGems on CentOS 4.

Let’s start by installing required libraries:

[root@lion ~]# yum  install gcc gcc-c++ ImageMagick-devel ghostscript freetype-devel \ 
                         libjpeg-devel libpng-devel libpng10-devel libwmf-devel libexif-devel libtiff-devel
[...]

Then install RMagick gem specifying version with ‘-v’ switch:

[root@lion ~]# gem install rmagick -v 1.15.14 
Building native extensions.  This could take a while...
Successfully installed rmagick-1.15.14
1 gem installed

2 Comments

Using squirrelmail in Plesk

August 2nd, 2008 — Linux, Plesk

Configuring apache for squirrelmail following this tutorial is not enough. You’ll need to configure squirrelmail too. Edit your /etc/squirrelmail/config_local.php file and paste the following configuration:

// courier-imap settings
$imap_server_type       = 'courier';
$default_folder_prefix  = 'INBOX.';
$trash_folder           = 'Trash';
$sent_folder            = 'Sent';
$draft_folder           = 'Drafts';
$show_prefix_option     = false;
$default_sub_of_inbox   = false;
$show_contain_subfolders_option = false;
$optional_delimiter     = '.';
$delete_folder          = true;
$force_username_lowercase = false;
 
// other settings
$default_charset        = 'iso-8859-1';
$lossy_encoding         = false;
$sendmail_args          = '-i -t';
$encode_header_key      = '';
$hide_auth_header       = false;
$plugins[3] = 'filters';
$abook_global_file = '';
$abook_global_file_writeable = false;
 
$addrbook_global_dsn = '';
$addrbook_global_table = 'global_abook';
$addrbook_global_writeable = false;
$addrbook_global_listing = false;

3 Comments

Flash player for Firefox on linux x86_64

August 1st, 2008 — Linux

If you are working on a x86_64 system don’t even try to go with 64bit of FireFox, just install 32bit version and enjoy all FireFox’s plugins: flash, java, … don’t waste your time.

Adobe didn’t released yet a 64bit flash plugin for linux, although there exists different workarounds to make 32bit plugins to work on the x86_64 platform they are still buggy.

If you’ll try to use nspluginwrapper you’ll end up with FireFox eating 1GB of ram after you’ll open a few flash sites because it’s leaking memory.

Let’s go to install firefox with flash-plugin, firstly remove firefox x86_64 version and then install i386 version:

[root@silver ~]# yum remove firefox.x86_64
[...]
[root@silver ~]# yum install firefox.i386
[...]

Then we’ll download rpm for linux from Adobe :
http://www.adobe.com/shockwave/download/alternates/

[root@silver ~]# rpm -ivh flash-plugin-9.0.124.0-release.i386.rpm
[...]

Now, you are ready to use your favorite browser on linux x86_64 with flash player.


Update:

An alpha refresh of 64-bit Adobe Flash Player 10 for Linux operating systems was released on 12/16/2008.

Download it from here:
http://labs.adobe.com/downloads/flashplayer10.html

1 Comment

TCP: drop open request from …

August 1st, 2008 — Linux

If are seeing a lots of “TCP: drop open request from A.B.C.D” messages and you don’t expect a real load the server, you’ll need to enable syncookies. Edit your /etc/sysctl.conf and append the following lines:

# enable syncookies
net.ipv4.tcp_syncookies = 1

Then restart network service.

[root@centurion ~]# /etc/init.d/network restart
Shutting down interface eth0:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Setting network parameters:                                [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:                                [  OK  ]

1 Comment