[Ubutnu] Create bridged network for qemu

Simple way to create bridged network between Ubuntu host and qemu client Install bridge-utils package first. sudo apt-get install bridge-utils Edit /etc/network/interfaces, and append the following configurations. Add a bridged network (br0) to your host network adapter (eth0)
------------------------
auto br0
iface br0 inet dhcp
 bridge_ports eth0
 bridge_stp off
 bridge_fd 0
 bridge_maxwait 0
------------------------
Restart your network. sudo /etc/init.d/networking restart Edit your script to boot qemu client, here is an example (-net nic, -net bridge,br=br0) qemu -net nic, -net bridge,br=br0 you are now ready to boot your qemu client with bridged network

[Ubutun] Repiar no sound problem on Ubuntu 16.04

Uninstall pulseaudio package

sudo apt-get purge pulseaudio

Remove the following files/folders

sudo rm -rf ~/.config/pulse /etc/pulse /usr/share/pulseaudio

Reboot you system

Reinstall pulseaudio package

sudo apt-get install pulseaudio

You might need to reinstall ubuntu-desktop if your 'Ubuntu System Settings' has disappeared

sudo apt-get install ubuntu-desktop

[gitlab] Backup & Restore

Backup Repository, Wiki, and etc.

sudo gitlab-rake gitlab:backup:create

Restore gitlab from a backup number 164486484 (move backup file under /var/opt/gitlab/backups/ folder)

sudo gitlab-rake gitlab:backup:restore BACKUP=164486484

Upload backup to local directory

Edit '/etc/gitlab/gitlab.rb', find 'backup_upload_connection', change 'local_root''s value with your backup path
----------------------------------------------------------------
gitlab_rails['backup_upload_connection'] = {
  'provider' => 'Local',
  'local_root' => '/mnt/backups'
}

# The directory inside the mounted folder to copy backups to
# Use '.' to store them in the root directory gitlab_rails['backup_upload_remote_directory'] = 'gitlab_backups' ----------------------------------------------------------------
Don't forget to give access permission for git user
You need to run gitlab reconfigure to apply new settings sudo gitlab-ctl reconfigure

Setup crontab for daily backup

sudo crontab -e Add the following two line command into your crontab (Ex. cron will execute gitlab backup every 2:00 A.M, and backup /etc/gitlab every 2:05 A.M) 0 2 * * * /opt/gitlab/bin/gitlab-rake gitlab:backup:create CRON=1 5 2 * * * umask 0077; tar -cf /mnt/gitlab/backups/$(date "+etc-gitlab-%s.tar") -C / etc/gitlab *if you get some error message which are related to folder permission, please make sure your backup location are writeable for git user.

Restore Configuration File (Move backup file under /etc/gitlab/ folder)

sudo tar -xf etc-gitlab-XXXXXXXXXX.tar -C /

Reference

https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/raketasks/backup_restore.md http://docs.gitlab.com/omnibus/settings/backups.html

[Ubuntu] Change network name to eth0

1. Modify GRUB_CMDLINE_LINUX="" with GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0" sudo nano /etc/default/grub 2. update grub and reboot sudo update-grub

Linux Subtitle Editor - (gaupol / gnome-subtitles)

gaupol sudo apt-get install gaupol gnome-subtitles sudo apt-get install gnome-subtitles

testdisk - disk data recovery

sudo apt-get install testdisk

okular - universal docuemnt viewer

sudo apt-get install okular