mmrwoods

# dump all databases once every 24 hours
45 4 * * * root nice -n 19 su - postgres -c "pg_dumpall --clean" | gzip -9 > /var/local/backup/postgres/postgres_all.sql.gz

# vacuum all databases every night (full vacuum on Sunday night, lazy vacuum every other night)
45 3 * * 0 root nice -n 19 su - postgres -c "vacuumdb --all --full --analyze"
45 3 * * 1-6 root nice -n 19 su - postgres -c "vacuumdb --all --analyze --quiet"

# re-index all databases once a week
0 3 * * 0 root nice -n 19 su - postgres -c 'psql -t -c "select datname from pg_database order by datname;" | xargs -n 1 -I"{}" -- psql -U postgres {} -c "reindex database {};"'

timoxley

nconf becomes environment aware.

In the following example we have settings for test, development and production environments. defaults is used where a value for that particular key is not supplied for the current environment.

{
  "test": {
    "url": "localhost"
  },
 "staging": {

marktheunissen

This playbook has been removed as it is now very outdated.

KartikTalwar

The fastest remote directory rsync over ssh archival I can muster (40MB/s over 1gb NICs)

This creates an archive that does the following:

rsync (Everyone seems to like -z, but it is much slower for me)

• a: archive mode - rescursive, preserves owner, preserves permissions, preserves modification times, preserves group, copies symlinks as symlinks, preserves device files.
• H: preserves hard-links
• A: preserves ACLs

marianposaceanu

Linux simple performance tweaks

Change the I/O Scheduler

Open $ vim /etc/default/grub then add elevator=noop next to GRUB_CMDLINE_LINUX_DEFAULT. Run $ update-grub and $ cat /sys/block/sda/queue/scheduler to be sure that noop is being used:

$ vim /etc/default/grub
$ update-grub
$ cat /sys/block/sda/queue/scheduler

[noop] deadline cfq

victorreyesh

//Install Macports.
//Install aircrack-ng:
sudo port install aircrack-ng
//Install the latest Xcode, with the Command Line Tools.
//Create the following symlink:
sudo ln -s /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport /usr/sbin/airport
//Figure out which channel you need to sniff:
sudo airport -s

sudo airport en1 sniff [CHANNEL]

torgeir

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>gd.wa</groupId>
    <artifactId>minimal-pom</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

joshuaconner

#!/usr/bin/env python
#
###############################################################################
# joshuaconner's Ansible Module skeleton
#
# This is a skeleton of an Ansible module I've been using to make quick-and-
# dirty Ansible modules. Just drop the code in `{{ PLAYBOOK_ROOT }}/library` 
# and it will be accessible like any other Ansible module.
# 
# This is probably not a "best practices" module skeleton, but I'd like it to

ngpestelos

May 8, 2018

I wrote this four years ago, so instead use this command:

$ docker rmi $(docker images -q -f dangling=true)

roge

DNS.md

A list of reasonably reliable DNS servers that I've personally tested to ensure that they fully support DNSSEC and do not hijack NXDOMAIN responses.

IPv4

Address	Organization	Location	Service
8.8.8.8	Google	Worldwide (Anycast)	Google Public DNS
8.8.4.4	Google	Worldwide (Anycast)	Google Public DNS