johnmccabe

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

johnmccabe

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

johnmccabe

package main

import (
    "fmt"
    "log"
    "time"
)

func work() error {
    for i := 0; i < 1000; i++ {

johnmccabe

package main

import (
    "fmt"
    "sync"
    "time"

    "golang.org/x/net/context"
)

johnmccabe

#!/bin/bash
echo "Removing lumogon containers"
docker ps -a | grep lumogon_ | awk '{ print $1 }' | xargs -I {} docker rm {}

johnmccabe

Install cockpit-docker for Docker CE on CentOS

sudo yum install epel-release
sudo yum -y install dnf dnf-plugins-core
dnf download cockpit-docker
sudo rpm -Uvh --nodeps cockpit-docker-138-6.el7.centos.x86_64.rpm
sudo service cockpit restart

johnmccabe

[root@do2mgs0hdqqkkbj ~]# docker run --rm -v /var/run/docker.sock:/var/run/docker.sock puppet/lumogon version
Client:
 Version:      20170524205424-0.2.0-27-ge10ec0d
 Git commit:   e10ec0df4c031da28e3972915ffd868731af4ce6
 Built:        2017-05-24 08:54:24 UTC
[root@do2mgs0hdqqkkbj ~]# docker run --rm -v /var/run/docker.sock:/var/run/docker.sock puppet/lumogon scan --debug
[lumogon] 2017/06/07 19:52:25.475292 [Analytics] Initializing Google Analytics: scan
[lumogon] 2017/06/07 19:52:25.475334 [Docker Adapter] Creating container runtime client: Docker
[lumogon] 2017/06/07 19:52:25.495651 [Scheduler] Creating scheduler
[lumogon] 2017/06/07 19:52:25.495682 [Docker Adapter] Creating container runtime client: Docker

johnmccabe

version: '3'
services:
  brooklyn:
    image: johnmccabe/brooklyn
    ports:
     - "8081:8081"
    links:
     - "node1:node1"
  node1:
    image: johnmccabe/fakevmtest

johnmccabe

{
    "providers": [
        {
            "name": "file::posix",
            "type": "file",
            "source": "builtin",
            "desc": "A provider to manage POSIX files.\n",
            "suitable": true,
            "attributes": [
                {

johnmccabe

      "target": "/etc/hosts",
      "title": "localhost"
    },
    {
      "ensure": "present",
      "ip": "255.255.255.255",
      "name": "broadcasthost",
      "provider": ":aug",
      "resource": "host",
      "target": "/etc/hosts",