eashish93

vs Questions

---

1. http://stackoverflow.com/questions/804115 (rebase vs merge).
2. https://www.atlassian.com/git/tutorials/merging-vs-rebasing (rebase vs merge)
3. https://www.atlassian.com/git/tutorials/undoing-changes/ (reset vs checkout vs revert)
4. http://stackoverflow.com/questions/2221658 (HEAD^ vs HEAD~) (See git rev-parse)
5. http://stackoverflow.com/questions/292357 (pull vs fetch)
6. http://stackoverflow.com/questions/39651 (stash vs branch)
7. http://stackoverflow.com/questions/8358035 (reset vs checkout vs revert)

ruzickap

---
- name: Create Instance in AWS
  hosts: localhost
  connection: local
  gather_facts: false

  vars:
    aws_access_key: "xxxxxx"
    aws_secret_key: "xxxxxx"
    security_token: "xxxxxx"

jordangraft

$ s3cmd get s3://us-east-1.elasticmapreduce/libs/s3distcp/1.latest/s3distcp.jar
$ hadoop jar ./s3distcp.jar --src s3a://<bucket>/input/ --dest=s3a://<bucket>/output

buonzz

$ docker-compose up -d         # start containers in background
$ docker-compose kill          # stop containers
$ docker-compose up -d --build # force rebuild of Dockerfiles
$ docker-compose rm            # remove stopped containers
$ docker ps                    # see list of running containers
$ docker exec -ti [NAME] bash # ssh to the container

# list all images
docker images

fulv

Put this in your `local-configure.yml` file, add as many users as you need:

    users:
      - name: fulvio
        sudoer: yes
        auth_key: ssh-rsa blahblahblahsomekey this is actually the public key in cleartext
      - name: plone_buildout
        group: plone_group
        sudoer: no
        auth_key: ssh-rsa blahblahblah ansible-generated on default

kn9ts

# AWS Version 4 signing example
# 
# Example:
# Authorization: AWS4-HMAC-SHA256 Credential=AKIDEXAMPLE/20150830/us-east-1/iam/aws4_request, SignedHeaders=content-type;host;x-amz-date, Signature=5d672d79c15b13162d9279b0855cfba6789a8edb4c82c400e06b5924a6f2b5d7

# Formulae:
# CanonicalRequest =
#   HTTPRequestMethod + '\n' +
#   CanonicalURI + '\n' +
#   CanonicalQueryString + '\n' +

JPvRiel

Overview

Some notes about:

• Explaining why current day Linux memory swap thrashing still happens (as of 2016).
• Mitigating "stop the world" type thrashing issues on a Linux workstation when it's under high memory pressure and where responsiveness is more important than process completion.
• Prioritizing and limiting memory use.
• Older ulimit versus newer CGroup options.

These notes assume some basic background knowledge about memory management, ulimits and cgroups.

atrepca

[Unit]
Description=Apache Kafka server (broker)
Documentation=http://kafka.apache.org/documentation.html
Requires=network.target remote-fs.target
After=network.target remote-fs.target

[Service]
Type=simple
PIDFile=/var/run/kafka.pid
User=kafka

rajankur

Making an Amazon EBS Volume Available for Use

• Right click newly created volume and attach to your instance.
• Reboot EC2.
• sudo file -s /dev/xvdb (where xvdb is the name of the volume)
• if the above command shows data for the device, there is no file system on the device and you need to create one.
• Make filesystem using sudo mkfs -t ext4 /dev/xvdb.
• Create a mount point directory for the volume using sudo mkdir mount_point (sudo mkdir /data)
• Mount the volume at the location: sudo mount device_name mount_point i.e. sudo mount /dev/xvdb /data
• To mount this EBS volume on every system reboot, add an entry for the device to /etc/fstab file

ericandrewlewis

top (the UNIX process inspector) cheat sheet

This is a list of the most helpful keyboard commands I use within top.

The basics

h shows help on interactive commands. Also see the top manual page

q to quit the program.