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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

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git config --global url."https://github.com/".insteadOf git@github.com:
git config --global url."https://".insteadOf git://

pathcl

How to config rabbitmq server cluster [3 nodes]

Edit /etc/hosts

vi /etc/hosts
192.168.10.157  rabbitmq-1
192.168.10.159  rabbitmq-2
192.168.10.161  rabbitmq-3

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'''
Basic tail command implementation
Usage:

tail.py filename numlines

'''

import sys
import linecache

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Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

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#!/bin/bash
# USAGE: CLUSTER=mycluster SERVICE=myservice ./docker-exec-ecs.sh
set -euf -o pipefail

TASK_ARN=$(aws ecs list-tasks --cluster=$CLUSTER --service=$SERVICE \
           | jq -r .taskArns[0])
if [ "$TASK_ARN" = "null" ]; then
  echo "Could not find any running tasks for $SERVICE on cluster:$CLUSTER."
  exit 1
fi

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sudo gitlab-rails console
ApplicationSetting.last.update_attributes(signin_enabled: true)
exit
sudo gitlab-ctl restart