XEN: kernel panic

При настройке нового XEN, в конфиге grub необходимо указать dom0_mem
В одном из официальных wiki предлагают указать

dom0_mem=256M

Но данного объема RAM недостаточно, в связи с чем возникает Kernel panic
Для решения данной "проблемы" можно указать значение равное 1gb:

dom0_mem=1024M

Slow ssh login in CentOS 6. ( Upd: CentOS 7)

• Cent OS 6
Edit sshd_config:


vi /etc/ssh/sshd_config

change from


#useDNS yes

to


useDNS no



FRM

Upd:
• Cent OS 7
Edit sshd_config:


vi /etc/ssh/sshd_config

change from


#useDNS yes

to


useDNS no


and change from


GSSAPIAuthentication yes

to


GSSAPIAuthentication no



FRM2

Filesystem update

What u do when filesystem update
During your next update, you will get a error message like:

error: failed to commit transaction (conflicting files)
filesystem: /bin exists in filesystem

The update merges all binaries into a unified /usr/bin directory. This step removes a distinction that has been meaningless for Arch systems and simplifies package maintenance for the development team. See this post for more explanation of the reasoning behind this change. The following instructions will ensure a safe update:

1. Fix any non-official packages with files in /bin, /sbin or /usr/sbin to put those files in /usr/bin. The list of packages that are not in a repo that need to be fixed can be generated using:

   $ pacman -Qqo /bin /sbin /usr/sbin | pacman -Qm -

   Also check packages installed from non-official repos using:

   $ paclist <repo> | awk ' { print $1 } ' | pacman -Ql - | grep ' /s\?bin/\| /usr/sbin/'

2. Make sure any packages in IgnorePkg or IgnoreGroup do not have files in /bin, /sbin or /usr/sbin. Fix them if necessary.
3. If you have files in /bin, /sbin or /usr/sbin that are unowned by any package, you need to move them. Find a list using:

   $ find /bin /sbin /usr/sbin -exec pacman -Qo -- {} + >/dev/null

4. Ensure all partitions are mounted if using autofs. They may not automount when needed later in this update.
5. Update your system. Before performing this update, you may want to ensure you have a second terminal open with root privileges in the unlikely event of an emergency, particularly if updating over ssh.

   # pacman -Syu --ignore filesystem,bash
   # pacman -S bash
   # pacman -Su

Hotot: Nice desktop linux twitter client

Hotot

Look like TweeDeck

Thunderbird: автодополнение (screenshots)