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.
You are already using Linux, so you have dd already, you don't need any other tools to make a bootable USB disk!
sudo dd bs=1M if=galliumos-3.1-baytrail.iso of=/dev/sda ; sync
Notice:
You should use your iso file name and replace /dev/sda to your own USB disk device.
Reference
try to download something but axel said "SSL error: (null)", so
axel https://github.com/axel-download-accelerator/axel/releases/download/v2.17.9/axel-2.17.9.tar.gz
tar xvfz axel-2.17.9.tar.gz
cd axel-2.17.9
sudo apt install pkg-config -y
./configure && make && sudo make install
sudo apt remove axel
cd ..
rm -rf axel-2.17.9
最近把一台CentOS7 虚拟机从Windows 10 的VMWare 迁移到 CentOS8 的VirtualBox上，结果不能启动，说找不到 root 和 swap。我猜测与 Host机器CPU架构不同有关，老机器是Intel芯片，新机器是 AMD CPU。
解决方法也蛮简单，进Rescue模式， yum update 就会自动装上一个新鲜的符合条件的内核。然后再重新启动就好了。 Reference
如此搞一下之后，启动倒是启动起来了，但启动时总有一个出错信息“error failed to send host log ”，虽然不影响使用，但看着很不爽。万能的Google很快给出了答案，把显卡换成 VBoxVGA 就好了。Reference
为啥用 fcitx 不用ibus呢.... 一开始我确实是用的ibus，但它老人家在 google doc 的网页里不显示候选文字框，等修复不知道要等到啥时候，我就扭头换 fcitx 了。
ibus-rime, fcitx-rime 已经内置这个功能，但它的默认配置里没有使用这个功能。废话不说，贴上我的配置文件
~/.config/fcitx 或 ibus/rime/default.custom.yaml 内容如下
patch:
style:
display_tray_icon: true
horizental: false
font_point: 14
schema_list:
- schema: wubi_pinyin
- schema: pinyin_simp
ascii_composer/switch_key:
Shift_R: commit_code
Shift_L: commit_code
~/.config/fcitx 或 ibus/rime/wubi_pinyin.custom.yaml 内容如下：
patch:
switches:
- name: ascii_mode
reset: 0
states: [ "中文", "西文" ]
- name: full_shape
states: [ "半角", "全角" ]
- name: simplification
states: [ "汉字", "漢字" ]
simplifier/opencc_config: s2t.json
engine/filters:
- simplifier
- uniquifier