notes

Example with watch command:

watch -n 1 'ps aux | kazy -i cmproxy -e kazy | kazy -r "[\d]+" -x | xargs -I % ls -l /proc/%/fd/ | kazy -i socket | wc -l'

Example with ttyplot command:

{ while true; do ps aux | kazy -i cmproxy -e kazy | kazy -r "[\d]+" -x | xargs -I % ls -l /proc/%/fd/ | kazy -i socket | wc -l; sleep 1; done } | ttyplot

Install ttyplot:

grm install tenox7/ttyplot -n ttyplot

Ping plot:

ping 8.8.8.8 | sed -u 's/^.*time=//g; s/ ms//g' | ttyplot -t "ping to 8.8.8.8" -u ms

More examples

Open wireshark GUI as root user:

sudo wireshark

Start capturing by clicking Capture button and add the following display filter:

http and (tcp.port == 8082 or tcp.port == 8000)

Case 1: it is done in a separate commit:

• rebase on a base branch git rebase -i <base_branch>
• in the editor, find the commit which updates the pointer and remove it from history (by replacing pick with d)
• force push it when the rebase is done

Case 2: it is done in the commit which contains other changes

• rebase on a base branch git rebase -i <base_branch>
• in the editor, find the commit which includes the pointer update and mark it for editing (by replacing pick with e)
• git will start rebasing the code and will stop on selected commit for editing
• unstage the change git restore --staged <path_to_submodule>
• continue the rebase git rebase --continue
• force push it when the rebase is done

socat UNIX-LISTEN:/var/run/hapee-lb.sock,mode=666,fork TCP-CONNECT:127.0.0.1:1936

Will create /var/run/hapee-lb.sock file which forwards all input to 127.0.0.1:1936. fork parameter will allow it to handle connection close and accept more than 1 request

Very useful command to cherry pick the whole branch

git cherry-pick 751a77^..8b62f1

^ - means the the first commit will be included too

If your repository has an installed pre-commit hook which uses husky or anything similar and you use Github Desktop for linux installed via flatpak it won’t work. The reason for this is that flatpak environment doesn’t have all necessary dependencies (npx, husky and etc.). There is a way to mount parts of your host file system to the flatpak environment (with --filesystem flag), but it excludes all sensitive folders (including /usr/bin/). A possible solution would be to mount the content of /usr/bin/ to a custom folder in flatpak environment and override PATH environmental variable. But the quick fix for now is to just disable it:

flatpak override --user --env=HUSKY=0 io.github.shiftey.Desktop

There is no official guide to migrate from Rocky Linux to CentOS Stream, however, it can be achieved by using official CentOS to CentOS Stream migration guide

1. Install centos-release-stream package

dnf install https://vault.centos.org/centos/8/extras/x86_64/os/Packages/centos-release-stream-8.1-1.1911.0.7.el8.x86_64.rpm

2. The next step is to swap Rocky Linux repositories to CentOS Stream ones. This is done with dnf swap centos-{linux,stream}-repos -y command. However, this command will cause multiple conflicts in Rocky Linux. To solve them:

• copy /etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial file from any Centos Stream system into Rocky Linux
• remove conflicting packages:

  rpm -e --nodeps rocky-repos
  rpm -e --nodeps rocky-release
  

• complete installing CentOS Stream repositories

  dnf swap centos-{linux,stream}-repos -y
  

3. Switch to CentOS Stream

dnf distro-sync -y

4. Verify installation and reboot the server:

cat /etc/centos-release
reboot

sudo firewall-cmd --add-rich-rule="rule family='ipv4' source address='89.20.160.77' reject" --timeout=1h

Valid values for timeout - numbers followed by s, m or h

Documentation