Lik`s forum

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# Who : http://lxlabs.com
#
# What : kloxo
#
# "Kloxo (Previously Lxadmin) The most flexible software on this
# planet. From Kloxo HostInaBox, World's lightest and the most
# efficient webhosting platform, to Kloxo Enterprise, which can
# manage 100s of thousands of domains on hundreds of servers. Kloxo
# is a fully scriptable, distributed, 100% object oriented hosting
# platform. There is nothing in ...

Possible HyperVM update issues

http://lxcenter.org/

HyperVM-Updates
Update several times on a day, HyperVM at Home>Update Home. Almost every day there are one or more new version releases.
There is no release schedule at lxlabs, and there are no release notes for every version released.
As new user, register at the lxlabs forum and visit it at least each day once to see bug reports or other technical things.
Until lxlabs uses release notes and a ...

Полезные опции Exim`a

Командная строка Exim'а использует стандартный для Unix-систем способ
задания опций. Каждая начинается с дефиса, после каждой может следовать
несколько аргументов. Опции совместимы с основными опциями Sendmail и
частично Smail.

Количество опций Exim'а просто огромно. В данной статье перечислены и
описаны только прикладные, полезные для администрирования уже
настроенной и работающей почтовой системы среднего по масштабам
почтового сервера. Для некоторых опций приведены примеры эффективного
использования.

> exim -d

отладка. Крайне полезная опция. Специально начал ...

Manual telnet sessions with a remote mail server

Simple manual telnet session with mail host. Uppercase/lowercase does not appear to be significant.

You do/type this -------> Server responds with

Telnet to hostname on port 25
------------>220 (then identifies itself)
HELO your_domain_name or whatever
------------>250 (followed by human readable message)
MAIL FROM:you@hostname.com
------------>250 is syntactically correct (or similar)
RCPT TO:them@someplace_else.com (email address you want to send to)
------------>250 is syntactically correct
DATA Tells you to send ...

I just investigated a cpanel server that was showing two spamd processes that were using 100% of CPU time.
In case you see a similar problem on your server there is an easy fix released by cPanel, but before we go there please note that this is not a cPanel issue, but it’s a SpamAssasin issue (bug) that is promised to be fixed in version 3.2.4

Until then you should run as root the fallowing ...

From time to time you will get hanged process or you are unsure of what a process is doing at that moment.

You can trace what a process is doing by running:

Code: Select all

strace -p PID

Where PID is the process ID. Whis will show you what that process is doing in real time.
This is usefull for detecting exploits or the source of a hang process.
To detach from that process simply press CTRL + ...

WHM locked out - cPHulkd

Today we were locked out on one of our server by cPHulkd. When trying to access the server from WHM we were getting the following message. Thus not allowing us to login into WHM also we were not able to access shell.

—————————————————————————————
This account is currently locked out because a brute force attempt was detected. Please wait 10 minutes and try again. Attempting to login again will only increase ...

Securing the /tmp Partition

It is recommended to create /tmp as separate partition and mount it with the noexec and nosuid options.

* The noexec option disables the executable file attribute within an entire file system, effectively preventing any files within that file system from being executed.
* The nosuid option disables the SUID file-attribute within an entire file system. This prevents SUID attacks on, say, the /tmp file system.

To secure the /tmp partition ...

Recompiling Apache With More File Descriptors on RedHat-like System

Initial/same issue was described at : https://documentation.cpanel.net/display/EA/Known+Issues
To recompile related applications and libraries, such as openssl, apache, imap, PHP etc from source RPMs with increased FD_SETSIZE value, perform the following steps:

1. Make sure that the system allows to open enough files:

Code: Select all

# /sbin/sysctl fs.file-max
fs.file-max = 131072


If fs.file-max is quite small (several thousands or so), change it in the following way:
1. Add ...

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