Isaac Johnston superstructor

Docker stats collection for collectd

This script can be used to feed collectd with cpu and memory usage statistics for running docker containers using the collectd exec plugin.

This script will report the used and cached memory as well as the user and system cpu usage by inspecting the appropriate cgroup stat file for each running container.

Usage

This script is intented to be executed by collectd on a host with running docker containers. To use, simply configure the exec plugin in collectd to execute the collectd-docker.sh script. You may need to adjust the script to match your particulars, such as the mount location for cgroup.

What I actually did

/etc/security/limits.conf

elasticsearch hard memlock 100000

/etc/default/elasticsearch

We've learned a bit about how ClojureScript's macro system works in bootstrapped mode over the past half year.

Here is a collection of posts I've made on the subject.

But first, it's probably worth reading https://github.com/clojure/clojurescript/wiki/Differences-from-Clojure#macros

Portable Macro Musing was written prior to bootstrapped macros really being available (really—at the time all you could do was stuff like this.
Runtime macroexpand is about using bootstrap's runtime capability to expand macros.
Messing with Macros at the REPL explores a bit about how bootstrap macros are put into a pseudo-namespa

	#!/bin/sh

	# Update latest epel
	wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
	sudo rpm -Uvh epel-release-6-8.noarch.rpm

	# Download and build mosh
	sudo yum -y install rpm-build rpmdevtools protobuf-compiler protobuf-devel libutempter-devel zlib-devel ncurses-devel openssh-clients perl-IO-Tty openssl-devel gcc gcc-c++
	rpmdev-setuptree
	cd ~/rpmbuild/SOURCES

	// This systemd runs iptables-restore on boot:
	[Unit]
	Description=Packet Filtering Framework
	DefaultDependencies=no
	After=systemd-sysctl.service
	Before=sysinit.target

	[Service]
	Type=oneshot
	ExecStart=/usr/sbin/iptables-restore /opt/docker/scripts/iptables/iptables.rules

	(ns clj-spec-playground
	(:require [clojure.string :as str]
	[clojure.spec :as s]
	[clojure.test.check.generators :as gen]))

	;;; examples of clojure.spec being used like a gradual/dependently typed system.

	(defn make-user
	"Create a map of inputs after splitting name."
	([name email]

	;; React supports "refs" as a way for a component to get a
	;; handle to its children. Classically, refs were string-based.
	;; Recent versions of React support callback attributes as a
	;; more elegant variant of accessing DOM notes or components.
	;;
	;; This example uses a Form-3 component as per
	;; https://github.com/Day8/re-frame/wiki/Creating-Reagent-Components
	;;
	;; For callback refs, see React's documentation
	;; https://facebook.github.io/react/docs/more-about-refs.html

	(require '[cemerick.url :as url]
	'[clojure.spec.alpha :as s]
	'[clojure.spec.gen.alpha :as gen]
	'[clojure.string :as string])

	(def non-empty-string-alphanumeric
	"Generator for non-empty alphanumeric strings"
	(gen/such-that #(not= "" %)
	(gen/string-alphanumeric)))

	# Generate a new pgp key: (better to use gpg2 instead of gpg in all below commands)
	gpg --gen-key
	# maybe you need some random work in your OS to generate a key. so run this command: `find ./* /home/username -type d \| xargs grep some_random_string > /dev/null`

	# check current keys:
	gpg --list-secret-keys --keyid-format LONG

	# See your gpg public key:
	gpg --armor --export YOUR_KEY_ID
	# YOUR_KEY_ID is the hash in front of `sec` in previous command. (for example sec 4096R/234FAA343232333 => key id is: 234FAA343232333)