noushi

My Openshift Cheatsheet

Examine the cluster quota defined for the environment:

$ oc describe AppliedClusterResourceQuota

Install pkgs using yum in a Dockerfile

noushi

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

noushi

#!/bin/sh
# https://bit.ly/2L80Ojm

POD=$( oc get pod -n glusterfs | grep heketi | cut -f1 -d' ' )

eval $(oc rsh $POD set | grep -i heketi )

oc rsh $POD heketi-cli --server $SERVER --user admin --secret $HEKETI_ADMIN_KEY

noushi

package memcached

import (
	"context"
	"reflect"

	cachev1alpha1 "github.com/example-inc/memcached-operator/pkg/apis/cache/v1alpha1"

	appsv1 "k8s.io/api/apps/v1"

noushi

### KERNEL TUNING ###

# Increase size of file handles and inode cache
fs.file-max = 2097152

# Do less swapping
vm.swappiness = 10
vm.dirty_ratio = 60
vm.dirty_background_ratio = 2

noushi

An Ansible summary

Jon Warbrick, July 2014, V3.2 (for Ansible 1.7)

Configuration file

intro_configuration.html

First one found from of

noushi

# Configure a Windows host for remote management with Ansible
# -----------------------------------------------------------
#
# This script checks the current WinRM/PSRemoting configuration and makes the
# necessary changes to allow Ansible to connect, authenticate and execute
# PowerShell commands.
# 
# Set $VerbosePreference = "Continue" before running the script in order to
# see the output messages.
#

noushi

Install Vagrant

sudo su
apt-get update && apt-get install -y libvirt-dev ruby-all-dev apparmor-utils
curl -O -L https://dl.bintray.com/mitchellh/vagrant/vagrant_1.6.5_x86_64.deb
dpkg -i vagrant_1.6.5_x86_64.deb 
aa-complain /usr/lib/libvirt/virt-aa-helper # workaround
exit

Install vagrant-kvm as user

noushi

Install Vagrant

sudo su
apt-get update && apt-get install -y libvirt-dev ruby-all-dev apparmor-utils
curl -O -L https://dl.bintray.com/mitchellh/vagrant/vagrant_1.6.5_x86_64.deb
dpkg -i vagrant_1.6.5_x86_64.deb 
aa-complain /usr/lib/libvirt/virt-aa-helper # workaround
exit

Install vagrant-kvm as user

noushi

This all applies to Ruby 2.1. In some cases a setting is not available in 2.0, this is noted. There is also a different with 1.9, 1.8, and REE --- these are not noted.

All the relevant code is in https://github.com/ruby/ruby/blob/trunk/gc.c

RUBY_HEAP_MIN_SLOTS

default: 10000

The number of heap slots to start out with. This should be set high enough so that your app has enough or almost enough memory after loading so that it doesn't have to allocate more memory on the first request (althogh this probably isn't such a big deal for most apps).

(todo: figure out how big a slot is. i think the answer can be infered from this code.)