Dev {Tricks}

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How to change the email sending limit in DirectAdmin?

SSH method

Login to SSH as root and Run below line.

echo 500 > /etc/virtual/bdhostit.com/limit/helpdesk1

The above command will increase daily email sending limit to 500 of helpdesk1@bdhostit.com.
Change the bold text replacing your details.

 

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Regular Expressions (regex) Cheat Sheet

Anchors

^ Start of string, or start of line in multi-line pattern
\A Start of string
$ End of string, or end of line in multi-line pattern
\Z End of string
\b Word boundary
\B Not word boundary
\< Start of word
\> End of word

Character Classes

\c Control character
\s White space
\S Not white space
\d Digit
\D Not digit
\w Word
\W Not word
\x Hexade­cimal digit
\O Octal digit

POSIX

[:upper:] Upper case letters
[:lower:] Lower case letters
[:alpha:] All letters
[:alnum:] Digits and letters
[:digit:] Digits
[:xdigit:] Hexade­cimal digits
[:punct:] Punctu­ation
[:blank:] Space and tab
[:space:] Blank characters
[:cntrl:] Control characters
[:graph:] Printed characters
[:print:] Printed characters and spaces
[:word:] Digits, letters and underscore

Assertions

?= Lookahead assertion
?! Negative lookahead
?<= Lookbehind assertion
?!= or ?<! Negative lookbehind
?> Once-only Subexp­ression
?() Condition [if then]
?()| Condition [if then else]
?# Comment

Quanti­fiers

* 0 or more {3} Exactly 3
+ 1 or more {3,} 3 or more
? 0 or 1 {3,5} 3, 4 or 5

Add a ? to a quantifier to make it ungreedy.

Escape Sequences

\ Escape following character
\Q Begin literal sequence
\E End literal sequence

“­Esc­api­ng” is a way of treating characters which have a special meaning in regular expres­sions literally, rather than as special charac­ters.

Common Metach­ara­cters

^ [ . $
{ * ( \
+ ) | ?
< >

The escape character is usually \

Special Characters

\n New line
\r Carriage return
\t Tab
\v Vertical tab
\f Form feed
\xxx Octal character xxx
\xhh Hex character hh

Groups and Ranges

. Any character except new line (\n)
(a|b) a or b
(…) Group
(?:…) Passive (non-c­apt­uring) group
[abc] Range (a or b or c)
[^abc] Not (a or b or c)
[a-q] Lower case letter from a to q
[A-Q] Upper case letter from A to Q
[0-7] Digit from 0 to 7
\x Group/­sub­pattern number “­x”

Ranges are inclusive.

Pattern Modifiers

g Global match
i * Case-i­nse­nsitive
m * Multiple lines
s * Treat string as single line
x * Allow comments and whitespace in pattern
e * Evaluate replac­ement
U * Ungreedy pattern

* PCRE modifier

String Replac­ement

$n nth non-pa­ssive group
$2 “­xyz­” in /^(abc­(xy­z))$/
$1 “­xyz­” in /^(?:a­bc)­(xyz)$/
$` Before matched string
$’ After matched string
$+ Last matched string
$& Entire matched string

Some regex implem­ent­ations use \ instead of $.

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PHP error

  • There has been a critical error on this website.
  • There has been a critical error on this website. Please check your site admin email inbox for instructions.
  • Service Unavailable. The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
  • Your PHP installation appears to be missing the MySQL extension which is required by WordPress.
  • Learn more about troubleshooting WordPress.

Solutions

  • Update wordpress
  • Check PHP version and validate with installed wordpress
  • Re-build PHP

 

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Disk Usage Quota

https://help.directadmin.com/item.php?id=42

 

Cannot open quotafile /home1/aquota.user: No such file or directory
repquota: Not all specified mountpoints are using quota.

https://forums.centos.org/viewtopic.php?t=50869
touch /home1/aquota.user
touch /home1/aquota.group
mount -vo remount /home1
quotacheck -vgum /home1

 

apache_public_html=0

home_override_list=/home:/home2:/home3

/etc/default/useradd
HOME=/home

 

Unable to open ./data/users/new/du_breakdown.list for reading. No such file or directory

 

To check whether quota package is installed or not

rpm –qa quota
or
yum list quota

Disk quota configuration in four steps

Enable quota
Remount file system
Create quota files
Configure quota policy

Enabling quota

To mount all partitions in file system at boot time, linux uses /etc/fstab file. This file contains six necessary information about the partition.

  1. What to mount: /dev/sda1 or UUID or device label
  2. Where to mount: / or /boot or /home or swap
  3. File system: xfs or swap or ext4
  4. Options: defaults, usrquota, grpquota
  5. Dump support: 0 or 1
  6. Automatic check:

vi /etc/fstab

Add defaults,usrquota,grpquota in option four. Save and restart system.

Remounting file system

mount –o remount /home

 

 

cat /etc/fstab
df -h
mount
/usr/local/directadmin/directadmin c | grep quota_partition
/usr/local/directadmin/directadmin c | grep use_xfs_quota
repquota `/usr/local/directadmin/directadmin c | grep quota_partition= | cut -d= -f2`
ls -lad /home/tmp
ls -la /home/tmp