mcastelino

MACVLAN

ip netns del net1
ip netns add net1
ip link add macvlan1 link enp130s0f0 type macvlan mode bridge
ip link set macvlan1 netns net1 up
ip netns exec net1 ip a add 192.168.1.200/24 dev macvlan1
ip netns exec net1 ping 192.168.1.101 -c1

Spindel

#!/bin/env python3
import os
import mmap
import logging
import hashlib
import contextlib
log = logging.getLogger(__name__)

@contextlib.contextmanager
def directio_mmap(filename, readsize, offset):

maxivak

Building Docker image with Packer and provisioning with Ansible

Overview

Packer

• Packer is used to build image from a base image, perform provisions and store (commit) the final image.

• We use provisioners and Packer templates to do the actual work to create the final image.

• We use Ansible for provisioning.

harlow

Golang Workers / Job Queue

A running example of the code from:

• http://marcio.io/2015/07/handling-1-million-requests-per-minute-with-golang
• http://nesv.github.io/golang/2014/02/25/worker-queues-in-go.html

This gist creates a working example from blog post, and a alternate example using simple worker pool.

TLDR: if you want simple and controlled concurrency use a worker pool.

ochinchina

package main

import (
        "bytes"
        "io"
        "os"
        "os/exec"
)

func main() {

denji

Moved to git repository: https://github.com/denji/golang-tls

Generate private key (.key)

# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048

# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)

rabbitt

import psycopg2 as pg

from io import BytesIO
from collections import defaultdict
from contextlib import contextmanager
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT, ISOLATION_LEVEL_READ_COMMITTED

READ_COMMIT = ISOLATION_LEVEL_READ_COMMITTED
AUTO_COMMIT = ISOLATION_LEVEL_AUTOCOMMIT

rgreenjr

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'