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RubyProgramowanie Authors: David Flanagan, Yukihiro Matsumoto helion.pl

GITRozproszony system kontroli wersji Author: Włodzimierz Gajda helion.pl

When configuring RAID it’s quite important to have the same partition tables on every disk. I’v done this many times on msdos partition tables like this: sfdisk -d /dev/sda | sfdisk /dev/sdb but it’s not working any more on GPT partition tables. Hopefully it still can be done but with different toolstack 😄 Install gdisk: apt-get install -y gdisk Then use sgdisk like this: sgdisk -R /dev/sd_dest /dev/sd_src sgdisk -G /dev/sd_dest First command will copy partition from /dev/sd_src to /dev/sd_dest. Second will randomize partition UUID’s - needed only if you want to use disks in same machine (this is my case). ...

There is need plugin for Django, named django-debug-toolbar but it needs some time to configure. So when I need simple way to debug SQL queries I use small hack. Add to your settings.py: LOGGING = { 'version': 1, 'disable_existing_loggers': False, 'handlers': { 'console': { 'level': 'DEBUG', 'class': 'logging.StreamHandler', } }, 'loggers': { 'django.db.backends': { 'handlers': ['console'], 'level': 'DEBUG', }, } } To get this working DEBUG option have to be set to True: ...

On Debian in default installation you have different configuration files for PHP in Apache, FPM, CLI, etc. But on CentOS you have only one php.ini for all of them. In case I have, I need to have different configuration file for scripts running in CLI mode (more memory, etc). I could run it like this: php -c /etc/php-cli.ini script.php But this a little burdensome. So I do it like this: ...

Everybody knows passwd command but it’s useless when you need to change ex. root password from command line without waiting for input. In such case oneliner below could help: echo "root:new_password" | chpasswd

These are few steps to get Steam running on Ubuntu: wget -c media.steampowered.com/client/installer/steam.deb dpkg -i steam.deb apt-get install -f apt-get update Solutions for some issues Some time ago I needed 32 bit flash even on 64 bit system - I don’t need it currently but I’m living this as a tip. apt-get install adobe-flashplugin:i386 After Ubuntu upgrade I was unable to run Steam anymore - It shouted on me with strange “networking problem”. I have to clean Steam configuration with: ...

When I was trying to update packages on one host I’ve stuck with yum hung on update. I run strace and see: strace -p 43734 Process 43734 attached - interrupt to quit futex(0x807c938, FUTEX_WAIT, 1, NULL <unfinished ...> Process 43734 detached It looks like yum database was corrupted, to repair this run: rm -f /var/lib/rpm/__db* rpm --rebuilddb yum clean all yum update Instead rm on db-files you could use gzip to have backup of these files. ...

I’ve few Nagios checks that require root privileges but running nrpe as root user is not acceptable. I prefer to use sudo for only these few commands. Run visudo and coment out this line: #Defaults requiretty This change is crucial to get scripts working. Then add at the end of file: %nrpe ALL=(ALL) NOPASSWD: /usr/lib64/nagios/plugins/ I’ve used nrpe group, but you have to add exactly group that your nrpe process uses. ...

After reading some SEO stuff I wanted to add some meta tags to my WordPress blog. I found this site: codex.wordpress.org/Meta_Tags_in_WordPress  external link . So WordPress thinks that it’s not necessary to have this meta tags any more… But I want it! 😃 Next funny thing is how they suggest to add meta tags: copy header.php - what about theme updates? ...