如何设置Vagrant框以始终拥有cron作业？

Question

如何配置Vagrant配置,以便在配置计算机时自动配置其crontab？(根据Chef(？)文件配置vagrant)

举个例子,我想设置以下cron:

5 * * * * curl http://www.google.com

Answer 1

没有Chef/Puppet/Ansible而是使用shell,可以很容易地完成这样的事情的基本配置.

该流浪文档覆盖这个基本配置相当不错了具有盒从boostrap.sh下载Apache的例子.

同样,您可以按照相同的步骤编辑Vagrantfile,以便在配置时调用bootstrap.sh文件:

Vagrant.configure("2") do |config|
  ...
  config.vm.provision :shell, path: "bootstrap.sh"
  ...
end

然后,您可以在与Vagrantfile相同的目录中创建一个bootstrap.sh文件,其中包含以下内容:

#!/bin/bash
# Adds a crontab entry to curl google.com every hour on the 5th minute

# Cron expression
cron="5 * * * * curl http://www.google.com"
    # ? ? ? ? ?
    # ? ? ? ? ?
    # ? ? ? ? ?????? day of week (0 - 6) (0 to 6 are Sunday to Saturday, or use names; 7 is Sunday, the same as 0)
    # ? ? ? ??????????? month (1 - 12)
    # ? ? ???????????????? day of month (1 - 31)
    # ? ????????????????????? hour (0 - 23)
    # ?????????????????????????? min (0 - 59)

# Escape all the asterisks so we can grep for it
cron_escaped=$(echo "$cron" | sed s/\*/\\\\*/g)

# Check if cron job already in crontab
crontab -l | grep "${cron_escaped}"
if [[ $? -eq 0 ]] ;
  then
    echo "Crontab already exists. Exiting..."
    exit
  else
    # Write out current crontab into temp file
    crontab -l > mycron
    # Append new cron into cron file
    echo "$cron" >> mycron
    # Install new cron file
    crontab mycron
    # Remove temp file
    rm mycron
fi

默认情况下,Vagrant配置程序以root身份运行,因此这将向root用户的crontab附加一个cron作业,假设它尚不存在.如果要将其添加到vagrant用户的crontab,则需要运行配置程序,并将privileged标志设置为false:

config.vm.provision :shell, path: "bootstrap.sh", privileged: false