小编sch*_*cho的帖子

在这个官方文档中,它可以在yaml配置文件中运行命令:

http://kubernetes.io/v1.1/docs/user-guide/configuring-containers.html

apiVersion: v1
kind: Pod
metadata:
  name: hello-world
spec:  # specification of the pod’s contents
  restartPolicy: Never
  containers:
  - name: hello
    image: "ubuntu:14.04"
    env:
    - name: MESSAGE
      value: "hello world"
    command: ["/bin/sh","-c"]
    args: ["/bin/echo \"${MESSAGE}\""]

如果我想运行多个命令,该怎么办？

从Rails API,我发现ActiveJob可以retry_job间隔:

my_job_instance.enqueue
my_job_instance.enqueue wait: 5.minutes
my_job_instance.enqueue queue: :important
my_job_instance.enqueue wait_until: Date.tomorrow.midnight

http://api.rubyonrails.org/classes/ActiveJob/Enqueuing.html

但是如果我想设置重试计数,比如Sidekiq:

include Sidekiq::Worker
sidekiq_options :retry => 5

https://github.com/mperham/sidekiq/wiki/Error-Handling

该示例代码怎么办？

class SiteScrapperJob < ActiveJob::Base
  rescue_from(ErrorLoadingSite) do
    retry_job queue: :low_priority
  end

  def perform(*args)
    # raise ErrorLoadingSite if cannot scrape
  end
end

现在我把它添加到我的工作班:

Sidekiq.default_worker_options = { retry: 5 }

但似乎不是很好.

我在最新的Mac OS上安装了vim by brew:

brew install vim

当我输入时brew info vim,它显示:

vim: stable 7.4.891, HEAD
Vi "workalike" with many additional features
http://www.vim.org/
Conflicts with: ex-vi
/usr/local/Cellar/vim/7.4.891 (1612 files, 28M) *
  Built from source
From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/vim.rb
...

但如果键入vim,它会显示我的7.3版本为vim:

VIM - Vi IMproved
  version 7.3
...

我该如何使用该7.4版本？

我正在使用rails,sidekiq和docker.

我的docker-compose.yml文件

sidekiq:
  build: .
  command: bundle exec sidekiq -C config/sidekiq.yml
  links:
    - db
    - redis

config/sidekiq.yml文件

:pidfile: ./tmp/pids/sidekiq.pid
:logfile: ./log/sidekiq.log
:queues:
  - default

运行后docker-compose up,sidekiq服务无法正常启动.

sidekiq_1 | No such file or directory @ rb_sysopen - /testapp/tmp/pids/sidekiq.pid
sidekiq_1 | /usr/local/bundle/gems/sidekiq-3.5.3/lib/sidekiq/cli.rb:365:in `initialize'
sidekiq_1 | /usr/local/bundle/gems/sidekiq-3.5.3/lib/sidekiq/cli.rb:365:in `open'
sidekiq_1 | /usr/local/bundle/gems/sidekiq-3.5.3/lib/sidekiq/cli.rb:365:in `write_pid'
sidekiq_1 | /usr/local/bundle/gems/sidekiq-3.5.3/lib/sidekiq/cli.rb:42:in `parse'
sidekiq_1 | /usr/local/bundle/gems/sidekiq-3.5.3/bin/sidekiq:12:in `<top (required)>'
sidekiq_1 | /usr/local/bundle/bin/sidekiq:16:in `load'
sidekiq_1 | /usr/local/bundle/bin/sidekiq:16:in `<main>'
testapp_sidekiq_1 exited with code 1

我创建了一个rails应用程序:testapp.

然后加入Dockerfile和docker-compose.yml其下的文件.

Dockerfile

FROM ruby:2.2.0
RUN apt-get update -qq && apt-get install -y build-essential mysql-client libmysqlclient-dev nodejs
RUN mkdir /testapp
WORKDIR /testapp
ADD Gemfile /testapp/Gemfile
ADD Gemfile.lock /testapp/Gemfile.lock
RUN bundle install
ADD . /testapp

泊坞窗,compose.yml

db:
  image: mysql
  environment:
    MYSQL_ROOT_PASSWORD: 1234
web:
  build: .
  command: bundle exec rails s -p 3000 -b '0.0.0.0'
  volumes:
    - .:/testapp
  ports:
    - "3000:3000"
  links:
    - db

我的数据库设置文件:

配置/ database.yml的

default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: …

我想使用docker来部署rails应用程序.我按照官方教程做了:

https://docs.docker.com/compose/rails/

但似乎我不幸运.

我的Dockerfile

FROM ruby:2.2.2

RUN apt-get update -qq && apt-get install -y build-essential

# for mysql
RUN apt-get install -y mysql-client libmysqlclient-dev

# for a JS runtime
RUN apt-get install -y nodejs

ENV APP_HOME /myapp
RUN mkdir $APP_HOME
WORKDIR $APP_HOME

ADD Gemfile $APP_HOME/Gemfile
ADD Gemfile.lock $APP_HOME/Gemfile.lock

RUN bundle install

ADD . $APP_HOME

我的docker-compose.yml

db:
  image: mysql
  ports:
    - "3306:3306"
web:
  build: .
  command: bundle exec rails s -p 3000 -b '0.0.0.0'
  volumes:
    - .:/myapp
  ports:
    - "3000:3000"
  links: …

我创建了一个使用mysql数据库的Rails应用程序。现在想将它们放入docker容器中。我正在使用docker，docker-machine，docker-compose。

我的docker-compose.yml

db:
  image: mysql
  environment:
    MYSQL_ROOT_PASSWORD: <%= ENV['MYSQL_ROOT_PASSWORD'] %>
  ports:
    - "3306:3306"

web:
  build: .
  command: bundle exec rails s -p 3000 -b '0.0.0.0'
  volumes:
    - .:/myapp
  ports:
    - "3000:3000"
  links:
    - db

我的config / database.yml

default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: <%= ENV['MYSQL_ROOT_PASSWORD'] %>
  host: <%= ENV['DB_PORT_3306_TCP_ADDR'] %>
  port: <%= ENV['DB_PORT_3306_TCP_PORT'] %>

development:
  <<: *default
  database: myapp_development

test:
  <<: *default
  database: myapp_test

production:
  <<: *default
  database: myapp_production

启动应用程序时

$ docker-compose up
...
sidekiq_1 …

我正在使用docker和rails.

我创建了一个本地gem并将其放入vendor/gems文件夹中.

我将它添加到我的Gemfile中:

gem 'my_gem', path: './vendor/gems/my_gem'

在我的Dockerfile中

RUN mkdir /testapp
WORKDIR /testapp
ADD Gemfile /testapp/Gemfile
ADD Gemfile.lock /testapp/Gemfile.lock
RUN bundle install
ADD . /testapp

运行后docker-compose build,它显示:

The path `/testapp/vendor/gems/my_gem` does not exist.
ERROR: Service 'web' failed to build: The command '/bin/sh -c bundle install' returned a non-zero code: 13