What I Touched This 2 Weeks 2016-11-27

This is a post in series "What I Touched"

This week I worked on syslog integration in skynet and delve into details of skynet. I also started using Gitlab CI.

skynet

云风的 BLOG: 代理服务和过载保护。使用 debug 命令 PING 可以检查服务是否还在，目前平均响应时间怎么样。命令 LINK 可以用来监控服务是否退出。

弄了一套脚本来编译，安装 skynet，生成和管理 skynet 项目。大概用起来

# 创建项目 helloworld
sx new helloworld
# 启动 skynet 应用
cd helloworld
sx skynet boot/helloworld.lua
# 创建新的 skynet 应用
sx new-app server
sx skynet boot/server.lua
# 执行 Lua
sx lua

Gitlab CI

Gitlab documentation does not mention how to setup docker registry key. Indeed, it requires a pair of RSA keys, use private key in Gitlab and public key in docker registry.

In .gitlab-ci.yml, variables defined in job level is also effective in top fields, such as before_script and services. Here is an example to test Rails using MySQL and Postgres

image: rails

services:
- redis
- $DB


cache:
    key: bundle
    paths:
        - vendor/bundle

variables:
POSTGRES_DB: center_test
POSTGRES_USER: runner
POSTGRES_PASSWORD: ""
MYSQL_DATABASE: center_test
MYSQL_ROOT_PASSWORD: root

before_script:
- cp config/database.ci-$DB.yml config/database.yml
- cp .ci.env .env
- bundle install --jobs $(nproc) --path=vendor/bundle

.test: &test_template
script:
    - bundle exec rake db:create RAILS_ENV=test
    - RAILS_ENV=test bundle exec rake db:reset
    - bundle exec rake test

test_pg:
<<: *test_template
variables:
    DB: postgres

test_mysql:
<<: *test_template
variables:
    DB: mysql

Using Docker Build - GitLab Documentation. I use dind to build docker images in Gitlab CI. It requires starting docker in privilege mode, which breaks some containers such as mysql. A simple solution is registering 2 docker runners, one is in privilege and another is not. Tag runners and add tags in .gitlab-ci.yml to filter runner.
In Mac, gitlab-ci-multi-runner must be started in user desktop environment. The runner may stuck at checkout code because the GUI is asking for keychain access. Just approve the access in desktop environment.

DevOps

GitHub - 3pjgames/terraform-provider-dnspod: Terraform Provider Plugin which manages DNS records in dnspod.cn
ubuntu - How can I selectively override some A records on a Bind DNS Server? - Server Fault. I need to override some A record to speed up internal SVN and Git access in Office. I used to setup zone file for the whole domain. However if I need to update DNS records, I have to update office zone config files and update in DNS provider. This solution saves my time, thanks a lot.
服务发现：Zookeeper vs etcd vs Consul - DockOne.io. Etcd does only one thing, Consule is more feature rich.
Backing up your minions’ databases to the Salt master. Let minion push files to master.

What I Touched This 2 Weeks 2016-11-27

November 27, 2016

skynet

Gitlab CI

DevOps

Misc