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README

This is an example of a socket-activated per-connection service (which is usually referred to as inetd-like service). A thorough explanation can be found at http://0pointer.de/blog/projects/inetd.html.

Define a socket unit

The key point here is to specify Accept=yes, which will make the socket accept connections (behaving like inetd) and pass only the resulting connection socket to the service handler.

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LPI-1 102 Notices

Topic 105: Shells, Scripting and Data Management

• 105.1 Customize and use the shell environment - 4
• 105.2 Customize or write simple scripts - 4
• 105.3 SQL data management - 2

Topic 106: User Interfaces and Desktops

• 106.1 Install and configure X11 - 2
• 106.2 Setup a display manager - 1
• 106.3 Accessibility - 1

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Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

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tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

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Docker

Images

Remove all images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              fce289e99eb9        4 months ago        1.84kB

$ docker rmi $(docker image ls --format "{{.ID}}")

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LPI-1 101 Notices

Topic 101: System Architecture

• 101.1 Determine and configure hardware settings
• 101.2 Boot the system
• 101.3 Change runlevels / boot targets and shutdown or reboot system

Topic 102: Linux installation and package management

• 102.3 Manage shared libraries
• 102.4 Use Debian package management
• 102.5 Use RPM and YUM package management

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QEMU/KVM Cheatsheet

Create KVM image with virt-build

cd /var/lib/libvirt/qemu/

sudo virt-builder fedora-26 \
--arch x86_64 \
--size 20G \
-m 8192 \

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LPI Essentials Notices

• Managing Users and Groups
• Managing File Ownership and Permissions
• Archiving Files
• Managing Linux Processes and Log Files
• Connecting Linux to a Network

8 Managing Users and Groups

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#enable each service for boot
systemctl enable nodemanager
systemctl enable adminserver

#then reboot and test

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Ansible - Cheatsheet

ansible-galaxy

Playbook template init with ansible-galaxy

ansible-galaxy init roles/myrole

ansible-playbook