Catalin(ux) M. BOIE homepage

Welcome to Catalin(ux) M. BOIE's page!
Here you can find some work of mine on Linux kernel & other stuff.

E-mail: catab # embedromix dot ro
Phone: +40-745-048374

My Fedora repository: rpm -Uhv http://kernel.embedromix.ro/dinorepo-0.0.9-1.noarch.rpm

Comercial support and customizations: Embedromix

[Home] [Networking] [Crypto] [Linux kernel patches] [Userspace] [Docs] [CV/Resume] [Links]

Name	Description	Links
RAID mini HOWTO	A mini howto describing linear, 0, 1, 5 and 6, using mdadm.	RAID.html
git mini HOWTO	A mini howto describing how to use git.	git.html
LVM mini HOWTO	A mini howto describing how to use LVM.	LVM.html
IPv6 mini howtos	Some mini howtos to easy IPv6 implementation.	ipv6.html
Random stuff	Some usefull one-liners.	random.html

Random stuff

Limit number of connections per second for ssh to maximum of 4 in 60 seconds:

iptables -I INPUT -p tcp --dport 22 -i eth0 -m state --state NEW -m recent --set
iptables -I INPUT -p tcp --dport 22 -i eth0 -m state --state NEW -m recent --update --seconds 60 --hitcount 4 -j DROP

Typing Unicode characters: CTRL+SHIFT+u, then the numeric code.

Making an SELinux domain permissive: /usr/sbin/semanage permissive -a httpd_t

Disabling HPA at boot (BIG WARNING: YOU CAN LOOSE DATA!): libata.ignore_hpa=1

Disabling HPA per disk (BIG WARNING: YOU CAN LOOSE DATA!): hdparm -N p<number_of_sectors> /dev/sd?

SELinux on low memory: /etc/selinux/semanage.conf: bzip-blocksize=4 and bzip-small=true

PostgreSQL: Find unused indexes: SELECT schemaname, relname, indexrelname, idx_scan, idx_tup_read, idx_tup_fetch FROM pg_stat_user_indexes;

PostgreSQL: Show activity: SELECT * FROM pg_stat_activity WHERE current_query != '<IDLE>';

Convert to ext4: tune2fs -O extents,uninit_bg,dir_index /dev/sdaaaa

Screencast: ffmpeg -f x11grab -g 250 -s 1024x768 -r 25 -y -sameq -i :0.0+0,0 x.avi.

Screencast (mkv): ffmpeg -f x11grab -g 250 -s 1024x768 -r 30 -y -sameq -i :0.0+0,0 -vcodec libx264 -vpre lossless_ultrafast -threads 0 x.mkv.