dnnta

# 数据来源 http://www.stats.gov.cn/tjsj/tjbz/xzqhdm/201703/t20170310_1471429.html
# 截止 2016 年 7 月 31 日
# 4 个直辖市下面的市辖区手动处理, 改为对应的名字,如 北京市-市辖区 改为 北京市-北京
# 其他市辖区, 直接去掉, 不入库
# 还有 4 个省直辖县级行政区划也手动处理, 去掉层级关系

class CreateChinaCities < ActiveRecord::Migration[5.0]
  def change
    create_table :china_cities do |t|
      t.integer :code, index: true

52cik

for i in $( docker images --format "{{.Repository}}:{{.Tag}}" )
do
  docker pull $i
done

# or
# docker images --format "{{.Repository}}:{{.Tag}}" | xargs -L1 docker pull

docker image prune -f

soarez

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.