Versie van 13 jul 2010 om 14:04

Rolandow's wiki

Vergaarbak van allerlei informatie die ik in de loop der tijd heb verzameld, en niet mag vergeten.

PHP

PHP Trics: preg_split, SimpleXML attributes, CDATA with dom document

Linux

Passive FTP

Als passive FTP niet werkt, dan moeten er modules geactiveerd worden. In /etc/modules toevoegen ip_conntrack_ftp en ip_nat_ftp.

Disable periodical fsck check's

The backup disk on jukebox was forcing a periocal fsck. This can be turned off with tune2fs.

tune2fs -c 0 -i 0d /dev/disk/by-id/usb-WD_My_Book_575532553130303331333730-part1

This should stop this message from syslog:

May 11 11:20:23 localhost automount[18777]: >> /dev/disk/by-id/usb-WD_My_Book_575532553130303331333730-part1 has been mounted 35 times without being checked, check forced.

SFTP chroot

We needed a user account to be able to receive files through SFTP. Since our port is opened at 2222 for the outside world. It seems that there is a CHROOT option in OpenSSH server nowadays. This needs to be changed in /etc/ssh/sshd_config:

Subsystem sftp internal-sftp

Match group sftponly
         ChrootDirectory /home/%u
         X11Forwarding no
         AllowTcpForwarding no
         ForceCommand internal-sftp

Then create a user like this:

adduser --ingroup sftponly --shell /bin/false <username>

Linux trics

Create snoop file of a port:

tcpdump -nvv -s 0 -w snoopport10295.snoop port 10295

Check the number of hits per IP, in the Apache access logs:

cat logs/access_log|grep 05/Feb/2007:14|awk '{print $1}'|sort|uniq -c

See what a process is doing:

lsof -p #PID

Last file in a directory:

ls -ltr|tail -n1

Partially extract a tarbal:

tar xvfz backup.tar.gz home/www/login.mobilebridges.com --exclude=*.log --exclude=*.xml

Use the t parameter instead of x to test tar.

tar tvfz backup.tar.gz home/www/login.mobilebridges.com --exclude=*.log --exclude=*.xml

Format your server:

dd if=/dev/zero of=/dev/hda bs=1M

This writes zero's to /dev/hda, so it will erase all data.

Format disk, using fat32:

1. Use fdisk to create the filesystem: fdisk /dev/hda - follow the prompts
2. Format it using mkfs.vfat -F 32 /dev/hda6
3. Add it to fstab

Add user:

adduser --gid 1010 --shell /usr/bin/false --home /home/www/peru charly

The GID should be the same for dutch and peru users. The home directory is different though.

Delete files older than 5 days:

find /home/www/login.mobilebridges.com/htdocs/Delivery/Error/ -mtime +5 -exec rm {} \;

Rename *.11.csv to *.csv:

rename 's/\.11\.csv$/\.csv/' *.csv

The ereg takes care of the rename action... the *.csv after that just selects the files that need to be renamed with this ereg.

Check projectsize Peru on developement:

/home/www/peru# du --max-depth=1 -h

Check if PING's are reaching the server:

tcpdump host 85.146.37.248 and icmp

85.146.37.248 is the source address.

See the number of connections to port 80 by ip:

netstat -pan|grep :80|sed 's/:/ /g'|awk '{print $6}'|sort|uniq -c

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