Scribbles for my memory

我喜欢用 .my.cnf 配置 mysql 的登录信息，这样我执行一些命令的时候就不用在命令行上提供密码。但今天我被自己设置的”高强度密码“坑到了

简而言之，如果你的密码里有#字符，请用双引号把整个密码括起来，要知道没有被引号括起来的 #字符，标识后面的都是注释。哈

package name for common used Linux util in Debian/Ubuntu

ps

apt install -y procps

ping

apt install -y iputils-ping

telnet

apt install -y telnet

general solution for apt get/apt upgrade similiar issues

first,

sudo dpkg --configure -a

followed by:

sudo apt --fix-broken install

The keyboard shortcuts setting in the Settings app can only support 4 workspaces. However, I want to use 8 workspaces to implement the goal of "everything in its right place". Solution:

sudo apt install dconf-editor
dconf-editor

org/gnome/desktop/wm/keybindings
# Then you can do what you want to do there

Reference

By the way, my final configuration is shown below:

Ctrl + 1-8 Switch to workspace 1-8
Ctrl+Alt+1-8 Move current window to workspace 1-8 and jump to that workspace

• Workspace 1: Chrome
• Workspace 2: Gnome-terminal
• Workspace 3: Rider
• Workspace 4: WebStorm
• Workspace 5: Ebook reader (Evince and others)
• Workspace 6: File Manager, BitTorrent downloader,
• Workspace 7: VMs
• Workspace 8: Settings, Telegram, music player, misc.

1. http_proxy environment in sudo command： http_proxy=xxx:xxx sudo yourcommand doesn't work, you should sudo http_proxy=xxx:yyy yourcommand instead.
2. ssh running local script: ssh username@hostname 'bash -s' < your.local.script.sh
3. ssh running local script with paraemters: ssh username@hostname < your.local.script.sh 'bash -s' yourparam1 yourparam2 doesn't work, you should runssh username@hostname < your.local.script.sh 'bash -s' -- yourparam1 yourparam2
4. make your fonts configuration work without a reboot: sudo fc-cache -fv

I followed this article to upgrade the kernel of one of our Linux server runs CentOS8. According to that article, upgrade the kernel of a CentOS system is rather simple, you just need to run the following command as root:

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
dnf -y install https://www.elrepo.org/elrepo-release-8.0-2.el8.elrepo.noarch.rpm
dnf -y --enablerepo=elrepo-kernel install kernel-ml

Everything goes fine before I try to boot up one of the VM in Virtualbox 6.

Boot failure, "The system is currently not set up to build kernel modules, please install the Linux kernel header files matching the current kernel.", it says.

Obviously, we need the correct header file, after digging a while on Google, I didn't get an answer. Then I review the steps I have done to upgrade the kernel. Oh, I got the solution below:

dnf -y --enablerepo=elrepo-kernel install kernel-ml-devel
/sbin/rcvboxdrv setup

Problem resolved.