mingliangguo

# libssl-dev and pkg-config are required in order to build websocat
# 
apt-get update && apt-get install -y curl build-essential libssl-dev pkg-config
curl https://sh.rustup.rs -sSf | sh
export PATH=$HOME/.cargo/bin:$PATH
cargo install --features=ssl websocat

EvgenyOrekhov

A simple Docker and Docker Compose install script for Ubuntu

Usage

1. sh install-docker.sh
2. log out
3. log back in

Links

makeittotop

Out of Memory (OOM) refers to a computing state where all available memory, including swap space, has been allocated.

Normally this will cause the system to panic and stop functioning as expected.
There is a switch that controls OOM behavior in /proc/sys/vm/panic_on_oom. 
When set to 1 the kernel will panic on OOM. 
A setting of 0 instructs the kernel to call a function named oom_killer on an OOM.
Usually, oom_killer can kill rogue processes and the system will survive. 
The easiest way to change this is to echo the new value to /proc/sys/vm/panic_on_oom.

# cat /proc/sys/vm/panic_on_oom 1

alexandrpaliy

Processor Information:
    Vendor:  GenuineIntel
    CPU Family:  0x6
    CPU Model:  0x3c
    CPU Stepping:  0x3
    CPU Type:  0x0
    Speed:  3600 Mhz
    4 logical processors
    4 physical processors
    HyperThreading:  Unsupported

wdullaer

# Ask for the user password
# Script only works if sudo caches the password for a few minutes
sudo true

# Install kernel extra's to enable docker aufs support
# sudo apt-get -y install linux-image-extra-$(uname -r)

# Add Docker PPA and install latest version
# sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
# sudo sh -c "echo deb https://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list"

soarez

How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

rothgar

# Idempotent way to build a /etc/hosts file with Ansible using your Ansible hosts inventory for a source.
# Will include all hosts the playbook is run on.
# Inspired from http://xmeblog.blogspot.com/2013/06/ansible-dynamicaly-update-etchosts.html

- name: "Build hosts file"
  lineinfile: dest=/etc/hosts regexp='.*{{ item }}$' line="{{ hostvars[item].ansible_default_ipv4.address }} {{item}}" state=present
  when: hostvars[item].ansible_default_ipv4.address is defined
  with_items: groups['all']