Set up OpenVPN connection on Ubuntu with DNS solving
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Disable media controls on lockscreen in KDE
Problem:
When VLC, Google Chrome, Firefox or any other app that can play media is launched, KDE draws media controls (play/pause, next, previous buttons + album art) on lock screen. I don’t like it.
Solution:
100% works on Kubuntu 18.04.
Open up terminal and run the following:
kwriteconfig5 --file kscreenlockerrc --group Greeter --group LnF --group General --key showMediaControls --type bool false
This command will append the following lines to ~/.config/kscreenlockerrc
[Greeter][LnF][General]
showMediaControls=false
Mastering ssh-tunnels
Add this to ~/.zshrc or ~/.bashrc and be happy =):
# By saying PROXY I mean it is a host located in internal network. # You can access any other internal hosts from it via SSH. # Export some variables export PROXY_KEY_PATH="~/.ssh/proxy/id_rsa" # path to locally stored private key from PROXY-server export PROXY_USER="user" # user name to get access to PROXY via SSH export PROXY_HOST="internal.host.foobar.com" # FQDN or IP of a proxy export PROXY_AUTH="$PROXY_USER@$PROXY_HOST" # literally it is a string "user@internal.host.foobar.com" # Connect to PROXY via SSH alias proxy="ssh $PROXY_AUTH" # Connect to PROXY via SSH and attach to screen (P.S. don't do it inside a locally launched screen :)) alias proxy_screen="ssh -t $PROXY_AUTH screen -x" # Forward some service's port which you can access only from PROXY to localhost:1234 # 1234 - local port with service # ServiceHost - IP-address of a host with service # ServicePort - Port of a service at ServiceHost alias tunnel_service='ssh -L 1234:ServiceHost:ServicePort $PROXY_AUTH' # Forward MySQL-connection which you can access only from some host inside enterprise network (no a PROXY-host) to localhost # MySQLHost - IP-address of MySQL-server # WebHost - IP-address of a host that can connect to MySQLHost # WebUser - User name to access from PROXY to WebHost via SSH alias tunnel_mysql='ssh -A -i $PROXY_KEY_PATH -L 3306:MySQLHost:3306 -o ProxyCommand="ssh $PROXY_AUTH nc WebHost 22" WebUser@WebHost' # Run some command at remote server and disconnect # TargetHost -IP-address of a host where you wanna execute your command # TargetUser - User name to access from PROXY to TargetHost via SSH # 'cd /srv/some/directory/; ls -al | wc -l)' - the command you are willing to run alias remote_directory_count="ssh -i $PROXY_KEY_PATH -t -o ProxyCommand='ssh $PROXY_AUTH nc TargetHost 22' TargetUser@TargetHost 'cd /srv/some/directory/; ls -al | wc -l)'"
Change ssh-key comment
ssh-keygen -f ~/.ssh/id_rsa -o -c -C "here goes your comment"
Command options explained:
-f: private key file
-o: convert the private key from PEM to the new OpenSSH format
-c: change the comment in the private and public key files
-C: comment text
KDE disable Windows key shortcut as menu luncher
In kde plasma 5.8+ the super/win key is also used to trigger the launcher, when pressed and released without combining it with another key. To disable the feature, put
[ModifierOnlyShortcuts]
Meta=
in ~/.config/kwinrc.
Deploy website via Git
On your server
~/www$ git init Initialized empty Git repository in /home/example.com/www/.git/
Enable current branch rewrite, cause with are using non-bare repo:
~/www$ git config receive.denyCurrentBranch ignore
Create hook .git/hooks/post-receive and write into it:
#!/bin/sh cd .. GIT_DIR='.git' git reset --hard
Make your hook executive:
~/www$ chmod +x .git/hooks/post-receive
On developer machine
Create repo, add all needed files to it, make your first commit.
git init git config --local user.name "Developer Name" git config --local user.email "developer@company.com" git add <some_files> git commit -m 'initial commit'
Now add remote repository as origin:
git remote add origin user@example.com:~/www/ git push --set-upstream origin master
How to work with repository?
After you have changed some files you should add them to commit and send this commit to repository.
git commit -am 'some commit message describes accepted changes' git push
Security
Make sure that your .htaccess file blocks access to .git/ and .gitignore. To prevent access put the following lines to your .htaccess:
# Prevents access to dot files (.git, .htaccess) - security.
RewriteCond %{SCRIPT_FILENAME} -d
RewriteCond %{SCRIPT_FILENAME} -f
RewriteRule "(^|/)\." - [F]
What if I change files directly on server?
All uncommited file changes on server will be ignored after git push from developer machine. If you still want to change files directly on server you should use another two hooks:
.git/hooks/pre-receive
#!/bin/sh cd .. GIT_DIR='.git' git stash save --quiet git stash show || true
.git/hooks/post-receive
#!/bin/sh cd .. GIT_DIR='.git' git reset --hard git stash pop --quiet || git reset --hard
Disable disk check on Windows 7 boot
To disable disk check on Windows 7 startup run cmd.exe as Administrator and execute the following command:
chkntfs /x c: d:
Put your drive letters instead of c: and d: to prevent disk check.
Calibri font ugly on Ubuntu
To fix this issue append to your ~/.config/fontconfig/fonts.conf file the following:
<match target="font" > <edit name="embeddedbitmap" mode="assign"> <bool>false</bool> </edit> </match>
After modifying font.conf logout and login back to your Ubuntu.
Update kernel on Ubuntu
To update your kernel version run the following commands in your terminal:
sudo add-apt-repository ppa:kernel-ppa/ppa sudo apt-get update apt-cache showpkg linux-headers
You will see the list of available kernels. Choose the kernel version you want and run:
sudo apt-get install linux-headers-3.8.0-26 linux-headers-3.8.0-26-generic linux-image-3.8.0-26-generic --fix-missing
Enter ssh password once
Everytime you establish ssh-connection or use git via ssh you will be asked for a password. I suggest to you a simple solution of that issue. Before connecting to remote machine run the following commands in your terminal:
ssh-agent bash ssh-add /home/$USER/.ssh/id_rsa