SINFERE sinfere

Docker Hub 镜像加速器

国内从 Docker Hub 拉取镜像有时会遇到困难，此时可以配置镜像加速器。

Dockerized 实践 https://github.com/y0ngb1n/dockerized

1️⃣ Docker daemon 配置代理（推荐）

Anatomy of Spring Boot Start Up Timing

When a Spring Boot app starts up with default (INFO) logging, there are some noticeable gaps (pauses). It's worth focusing on the gaps when looking for efficiency savings because of the amount of time they take, and because no-one bothered to log anything, so the chances are the app is doing something repetitive. We can tweak the logging levels to try and fill in the gaps and find out what is going on in there.

Basic empty web app with actuators has three such gaps:

0                                                                        1410ms
|------|---------------------------|-----|------|---------|--------|--------|
       |           578             |     |144(5)|         | 133(6) |

How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

	const puppeteer = require('puppeteer');

	(async () => {

	const browser = await puppeteer.launch();
	const page = await browser.newPage();
	// Adjustments particular to this page to ensure we hit desktop breakpoint.
	page.setViewport({width: 1000, height: 600, deviceScaleFactor: 1});

	await page.goto('https://www.chromestatus.com/samples', {waitUntil: 'networkidle'});

	su
	mkdir /mnt/root

	# You may use fdisk -l to list the devices
	mount /dev/mapper/fedora-root /mnt/root

	# Mount the boot partition, maybe /dev/sda1
	# As the system has both Ubuntu and Fedora installed,
	# so sda3 in my case
	mount /dev/sda<3> /mnt/root/boot

	#!/bin/bash

	# remove exited containers:
	docker ps --filter status=dead --filter status=exited -aq \| xargs -r docker rm -v

	# remove unused images:
	docker images --no-trunc \| grep '<none>' \| awk '{ print $3 }' \| xargs -r docker rmi

	# remove unused volumes:
	find '/var/lib/docker/volumes/' -mindepth 1 -maxdepth 1 -type d \| grep -vFf <(

	#!/bin/bash

	veth_in_use=()
	veth_unused=()
	veth_all=()

	function veth_interface_for_container() {
	local pid=$(docker inspect -f '{{.State.Pid}}' "${1}")
	mkdir -p /var/run/netns
	ln -sf /proc/$pid/ns/net "/var/run/netns/${1}"

	# This file contains only partial paths to match on
	# This file should reside in the same directory as the haproxy.cfg simply due to the way it is configured in the sample snippet-but they can go anywhere in the /etc/haproxy directory
	/my-partial- https://subdomain3.mydomain.com/my-new-full-path