sloppycoder

docker container prune --filter "until=8h" -f
docker network   prune --filter "until=8h" -f
docker image     prune --filter "until=8h" -f -a
# docker system prune

sloppycoder

# openshift installer by default uses a self-signed certificate for ingress controller
# in order to use the ingress we need to extract the certificate and add it to local 
# trusted cert store to avoid warnings

oc get secret router-certs-default -n openshift-ingress -o json > secret.json

jq -r '.data."tls.key"' secret.json | base64 -d > private_key.pem
jq -r '.data."tls.crt"' secret.json | base64 -d > cert.pem

#the cert.pem file contains 2 certificate. the 1st one is used by the ingress controller, 2nd one is signer.

sloppycoder

#!/bin/bash

export AWS_ACCESS_KEY_ID=
export AWS_SECRET_ACCESS_KEY=
export AWS_DEFAULT_REGION=ap-southeast1

if [ "$1" = "start" ]; then
    CMD=start-instances
else
    CMD=stop-instances

sloppycoder

centos6 is a directory of a VirtualBox VM, size 8689088000

command for compression
time tar --use-compress-program=pbzip2|lzop -cf centos6_oracle11r2.tar.xxx centos6
time lzrtar centos6

command for decompresison
time pbzip2|bzip2|lzop -cd centos6_oracle11r2.tar.xxx | tar tvf -
time lrzip -o - -d centos6.tar.lrz | tar tvf -

sloppycoder

# redirect port < 1024 to other ports so that server process can run as non-root

# localhost/loopback
sudo iptables -t nat -I OUTPUT -p tcp -d 127.0.0.1 --dport 443 -j REDIRECT --to-ports 8443

# external
sudo iptables -t nat -I PREROUTING -p tcp --dport 443 -j REDIRECT --to-ports 8443

sloppycoder

#!/usr/bin/env python
#
# EC2Instance must have an IAM role assign to it which has access to Route53 services
# in this script the role is called 'route53role'
#

from boto import utils, ec2, route53

instance_metadata = utils.get_instance_metadata(timeout=0.5, num_retries=1)