PHP Warning: preg_match(): Compilation failed: support for \P, \p, and \X has not been compiled

recompile pcre with option

–enable-utf8 –enable-unicode-properties

Upgrade all perl modules via CPAN

cpan -r
or
perl -MCPAN -e 'CPAN::Shell->install(CPAN::Shell->r)'

openfire logs problem

Error: java.io.FileNotFoundException: /logs/debug.log (No such file or directory)

Solution:
edit file “./lib/log4j.xml” and replace “{$openfireHome}” with absolute path to logs

fail2ban mysql

Dodaj kod do
/usr/share/fail2ban/server/datedetector.py

# AAMMJJ HH:MM:SS
template = DateStrptime()
template.setName("YearMonthDay Hour:Minute:Second")
template.setRegex("\d{2}\d{2}\d{2} \d{2}:\d{2}:\d{2}")
template.setPattern("%y%m%d %H:%M:%S")
self.__templates.append(template)


# cat /etc/fail2ban/filter.d/mysqld.conf

Fail2Ban configuration file
#
# Author: Darel
#

[Definition]
failregex = Access denied for user ‘.*’@’‘

perl – uninstall module

perl -MCPAN -e shell
install CPANPLUS
exit

perl -MCPANPLUS -e shell
help
[General]
h | ? # display help
q # exit
v # version information
[Search]
a AUTHOR … # search by author(s)
m MODULE … # search by module(s)
f MODULE … # list all releases of a module
o [ MODULE … ] # list installed module(s) that aren’t up to date
w # display the result of your last search again
[Operations]
i MODULE | NUMBER … # install module(s), by name or by search number
i URI | … # install module(s), by URI (ie http://foo.com/X.tgz)
t MODULE | NUMBER … # test module(s), by name or by search number
u MODULE | NUMBER … # uninstall module(s), by name or by search number
d MODULE | NUMBER … # download module(s)
l MODULE | NUMBER … # display detailed information about module(s)
r MODULE | NUMBER … # display README files of module(s)
c MODULE | NUMBER … # check for module report(s) from cpan-testers
z MODULE | NUMBER … # extract module(s) and open command prompt in it
[Local Administration]
b # write a bundle file for your configuration
s program [OPT VALUE] # set program locations for this session
s conf [OPT VALUE] # set config options for this session
s mirrors # show currently selected mirrors

mysql trigger

DELIMITER |
CREATE TRIGGER `klienci_before_insert` BEFORE INSERT ON `klienci`
FOR EACH ROW
set NEW.sha1 = sha1(NEW.klient_id+NEW.time_add);
|

DELIMITER ;

LVM on RAID 10

mdadm -v –create /dev/md1 –level=raid10 –raid-devices=4 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2
pvcreate /dev/md1
vgcreate vg-server1 /dev/md1
lvcreate -L4g -nlv-home vg-server1
lvcreate -L2g -nlv-var vg-server1
lvcreate -L1g -nlv-tmp vg-server1

The -L option specifies the size of the volume

lvcreate -l 100%FREE -nlv-home vg (creates all of the unallocated space in the volume group)

reducing volume  to 100GB (not for XFS filesystem!)

1. umount /dev/vg-server1/lv-zapas
2. e2fsck -f /dev/vg-server1/lv-zapas
3. resize2fs -p  /dev/vg-server1/lv-zapas 100G
4. lvreduce -L 100G /dev/vg-server1/lv-zapas
5. e2fsck -f /dev/vg-server1/lv-zapas
6. resize2fs -p  /dev/vg-server1/lv-zapas 
7. e2fsck -f /dev/vg-server1/lv-zapas
8. mount /dev/vg-server1/lv-zapas

extending volume up to 100GB  (not for XFS filesystem !)

1. umount /dev/vg-server1/lv-home
2. lvextend -L 100G /dev/vg-server1/lv-home or  ( lvextend -l +100%FREE /dev/vg-server1/lv-home)
3. e2fsck -f /dev/vg-server1/lv-home
4. resize2fs -p  /dev/vg-server1/lv-home
5. e2fsck -f /dev/vg-server1/lv-home
6. mount /dev/vg-server1/lv-home

extending volume + 1GB

lvextend -L+1G /dev/vg-server1/lv-var

reinstaling lilo

Boot from any Live CD

mkdir /myraid
mount /dev/md0 /myraid
mount /dev/sda1 /myraid/boot
mount –bind /dev /myraid/dev
mount -t devpts devpts /myraid/dev/pts
mount -t proc proc /myraid/proc
mount -t sysfs sysfs /myraid/sys
chroot /myraid
lilo
exit

umounting and deleteing array

umount /dev/md0
mdadm –stop /dev/md0
mdadm –zero-superblock /dev/sda1
mdadm –zero-superblock /dev/sdb1
mdadm –zero-superblock /dev/sdc1
mdadm –zero-superblock /dev/sdd1

software RAID repair (naprawa macierzy RAID)

1. In this example RAID  contents two disks (/dev/sda, /dev/sdb)  and 4 partitions ( md0, md1, md2, md3)
cat /proc/mdstat

Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
md1 : active raid1 sdb5[1] sda5[0]
 20979264 blocks [2/2] [UU]

md2 : active raid1 sda6[0] sdb6[1]
 20979968 blocks [2/2] [UU]

md3 : active raid1 sdb7[1] sda7[0]
 880264320 blocks [2/2] [UU]

md0 : active raid1 sdb1[1] sda1[0]
 20979648 blocks [2/2] [UU]

unused devices: <none>

2. If the RAID fail you will see

cat /proc/mdstat
 Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
 md1 : active raid1 sda5[0]
       20979264 blocks [2/1] [U_]
 md2 : active raid1 sda6[0]
       20979968 blocks [2/1] [U_]
 md3 : active raid1 sda7[0]
       880264320 blocks [2/1] [U_]
 md0 : active raid1 sda1[0]
       20979648 blocks [2/1] [U_]
 unused devices:

3. Disconnect failed hdd

4. Connect new hdd

5. Loook into dmesg for hdd letter

6. remove failed hdd from raid (usuniecie uszkodzonego dysku z macierzy)

mdadm /dev/md0 --fail detached --remove detached
mdadm /dev/md1 --fail detached --remove detached
mdadm /dev/md2 --fail detached --remove detached
mdadm /dev/md3 --fail detached --remove detached

7. copy partitions structure from old GOOD HDD to the new one ( kopiujemy strukture partycji z jednego dysku na drugi)

sfdisk -d /dev/sda | sfdisk /dev/sde

8. Add new hdd into RAID (# dodajemy nowo wsadzony dysk)

mdadm --add /dev/md0 /dev/sde1
mdadm --add /dev/md1 /dev/sde5
mdadm --add /dev/md2 /dev/sde6
mdadm --add /dev/md3 /dev/sde7

9. Rebuilding starts automaticaly, You can see RAID status by

cat /proc/mdstat

 10. and WHEN ALL PARTITIONS ARE REBUILDED run:

mdadm --detail --scan >> /etc/mdadm.conf