Archive for March, 2010

No Such User / Sender Verify error when sending via main account

March 28th, 2010

When using your cpanelusername@domain.tld account, the account needs to be able to receive mail, as well as send. If you login to your main account via webmail, and see the following errors posted, you’ll want to confirm that the address is permitted to receive mail.

Horde shows:
There was an error sending your message: Failed to add recipient: recipient@targetrecipient.com [SMTP: Invalid response code received from server (code: 550, response: Verification failed for No Such User Here" Sender verify failed)]

/var/log/exim_mainlog shows:
2010-03-28 18:47:46 H=localhost (userdomain.com) [127.0.0.1] sender verify fail for : No Such User Here" 2010-03-28 18:47:46 H=localhost (userdomain.com) [127.0.0.1] F= rejected RCPT : Sender verify failed

99.99999% of the time, you’ll see this issue when the Default Address is set to “fail”, making it unrouteable. In cPanel > Default Account, set the catch-all account to forward to another email address, and you’ll be all set.

# cat /etc/valiases/userdomain.com *: ":fail: No Such User Here"

Such a setting would tell the server that the account doesn’t exist, causing the Sender Verify error.

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Posted in Webmail

Tags: sender verify Webmail

OpenVZ: Set VE timezone

March 23rd, 2010

From within the container, run the following, changing the location data to match your timezone of choice:

#mv /etc/localtime /etc/localtime.old #ln -s /usr/share/zoneinfo/America/Chicago /etc/localtime

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Posted in Command Line, OpenVZ

Tags: date OpenVZ time

OpenVZ: CSF csftest.pl Failed

March 23rd, 2010

ERROR: RESULT: csf will not function on this server due to FATAL errors from missing modules [4]

CSF will work well in VZ containers, but needs specific iptables modules enabled. Below you’ll see how to enable these modules for use for all containers.

root@server [/csf]# perl csftest.pl Testing ip_tables/iptable_filter...OK Testing ipt_LOG...FAILED [FATAL Error: iptables: Unknown error 18446744073709551615] - Required for csf to function Testing ipt_multiport/xt_multiport...FAILED [FATAL Error: iptables: Unknown error 18446744073709551615] - Required for csf to function Testing ipt_REJECT...OK Testing ipt_state/xt_state...FAILED [FATAL Error: iptables: Unknown error 18446744073709551615] - Required for csf to function Testing ipt_limit/xt_limit...FAILED [FATAL Error: iptables: Unknown error 18446744073709551615] - Required for csf to function Testing ipt_recent...FAILED [Error: iptables: Unknown error 18446744073709551615] - Required for PORTFLOOD feature Testing ipt_owner...FAILED [Error: iptables: Unknown error 18446744073709551615] - Required for SMTP_BLOCK and UID/GID blocking features Testing iptable_nat/ipt_REDIRECT...FAILED [Error: iptables v1.3.5: can't initialize iptables table `nat': Table does not exist (do you need to insmod?)] - Required for MESSENGER feature

RESULT: csf will not function on this server due to FATAL errors from missing modules [4]

SOLUTION

Edit /etc/vz/vz.conf, and comment out the line starting with IPTABLES. Then, insert the following:

IPTABLES="ipt_REDIRECT ipt_owner ipt_recent iptable_filter iptable_mangle ipt_limit ipt_multiport ipt_tos ipt_TOS ipt_REJECT ipt_TCPMSS ipt_tcpmss ipt_ttl ipt_LOG ipt_length ip_conntrack ip_conntrack_ftp ip_conntrack_irc ipt_conntrack ipt_state ipt_helper iptable_nat ip_nat_ftp ip_nat_irc"

Be sure that the entire IPTABLES string is on a single line, and you’re all set.

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Posted in Command Line, OpenVZ

Tags: ConfigServer CSF iptables

Automated Time Sync Script

March 23rd, 2010

#!/bin/sh

#invoke ntpdate to set time from system clock if [ -x /usr/sbin/ntpdate ]; then /usr/sbin/ntpdate -s -t 5 date.cpanel.net /sbin/hwclock --systohc fi

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Posted in Scripts

Automating ClamAV updates, scans, and email alerts

March 23rd, 2010

http://code.google.com/p/clamav-cron/

Download clamav-cron somewhere like /usr/local/bin/ and give it execute permission:

# wget http://clamav-cron.googlecode.com/files/clamav-cron-0.6 -O /usr/local/bin/clamav-cron # chmod 755 /usr/local/bin/clamav-cron

Open the clamav-cron script with your editor and edit the “User configuration” section following the instructions.

Schedule the task using crond. Run crontab -e from the command-line and schedule your run of the task.

45 23 * * 6 /usr/local/bin/clamav-cron /home

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Posted in Command Line

Log MySQL Queries Not Using Indexes

March 23rd, 2010

First, create the log file location and give mysql ownership:

# touch /var/log/mysql-indexes.log #chown mysql:mysql var/log/mysql-indexes.log

Edit /etc/my.cnf, and insert:

log-queries-not-using-indexes = /var/log/mysql-indexes.log

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Posted in MySQL

What type of RAM is installed?

March 23rd, 2010

If you’re lacking notes on what motherboard or RAM you’ve got, and don’t want to take your server offline to check, dmidecode comes to the rescue!

root@gamma [~]# dmidecode # dmidecode 2.10 SMBIOS version fixup (2.31 -> 2.3). SMBIOS 2.3 present.


Handle 0x0012, DMI type 16, 15 bytes

Physical Memory Array

       Location: System Board Or Motherboard

       Use: System Memory

       Error Correction Type: Single-bit ECC

       Maximum Capacity: 512 MB

       Error Information Handle: Not Provided

       Number Of Devices: 6
Handle 0x0013, DMI type 17, 27 bytes

Memory Device

       Array Handle: 0x0012

       Error Information Handle: No Error

       Total Width: 72 bits

       Data Width: 64 bits

       Size: 1024 MB

       Form Factor: DIMM

       Set: 1

       Locator: DIMM#1A

       Bank Locator: BANK1

       Type: DDR

       Type Detail: Synchronous

       Speed: 266 MHz

       Manufacturer: Not Specified

       Serial Number: Not Specified

       Asset Tag: Not Specified

       Part Number: Not Specified

Handle 0x0014, DMI type 17, 27 bytes Memory Device Array Handle: 0x0012 Error Information Handle: No Error Total Width: 72 bits Data Width: 64 bits Size: 1024 MB Form Factor: DIMM Set: 1 Locator: DIMM#1B Bank Locator: BANK1 Type: DDR Type Detail: Synchronous Speed: 266 MHz Manufacturer: Not Specified Serial Number: Not Specified Asset Tag: Not Specified Part Number: Not Specified

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Posted in Command Line

One Liner: Find Large (or small) files

March 23rd, 2010

To find files larger than 20M:

#find . -type f -size +200000k -exec ls -lh {} \; | awk ‘{ print $9 “: ” $5 }’

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Posted in One Liners

One Liner: Find Broken Symlinks

March 23rd, 2010

One-liner to find broken symlinks in the filesystem:

#find -L . -type l

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Posted in Command Line, One Liners

OpenVZ – Multiple Subnets on a Single Interface

March 23rd, 2010

This post written by Robert Shady, posted at http://www.robertshady.com/sysadmin/sysadmin-virtualization/sysadmin-virtualization-openvz/5.html Reposting here as sort of a personal bookmark.

You have multiple subnets allocated to you (Ie: Let’s say 2 Class C IP4 address blocks – 10.10.10.1/24 and 10.10.20.1/24), and you want to be able to create containers that utilize IP addresses on either block.

Problem:
You can’t simply install OpenVZ and configure your containers to use IP addresses on either block. By default, OpenVZ will not broadcast ARP packets for IP blocks that it doesn’t have a venet interface for – even though you may be bridging your containers to your ethernet device.

Solution:
The solution is actually very easy, simply edit your /etc/vz/vz.conf file and change the ‘NEIGHBOUR_DEVS=detect’ to ‘NEIGHBOUR_DEVS=all’, save and reboot and everything should work beautifully.

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Posted in OpenVZ

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