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published/20201214 Set up an Ansible lab in 20 minutes.md
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published/20201214 Set up an Ansible lab in 20 minutes.md
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@ -0,0 +1,300 @@
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||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: (wxy)
|
||||
[#]: reviewer: (wxy)
|
||||
[#]: publisher: (wxy)
|
||||
[#]: url: (https://linux.cn/article-12970-1.html)
|
||||
[#]: subject: (Set up an Ansible lab in 20 minutes)
|
||||
[#]: via: (https://opensource.com/article/20/12/ansible-lab)
|
||||
[#]: author: (Mike Calizo https://opensource.com/users/mcalizo)
|
||||
|
||||
20 分钟建立一个 Ansible 实验室
|
||||
======
|
||||
|
||||
> 建立一个支持学习和实验新软件的环境。
|
||||
|
||||
|
||||
|
||||
能够构建和拆解公有云环境是非常有用的，但我们大多数人都不能轻松访问公有云。退而求其次的最好办法就是在本地机器上建立一个实验室，但即使在本地机器上运行也会带来性能、灵活性和其他挑战。大多数时候，本地机器上额外的工作负载会干扰我们日常的工作，它们当然也会影响你提供一个现成的环境来玩耍和实验新软件。
|
||||
|
||||
几年前，当我和我的团队开始学习 [Ansible][2] 时，我们就遇到了这个挑战。我们找不到一个可以单独使用的环境，我们对这种情况的失望导致我们中的一些人停止了实验。我们知道需要找到一个解决方案。
|
||||
|
||||
我们花了很多时间研究各种方案，得出了一套工具，使我们的好奇心能够在我们完全控制的环境中学习。我们可以在本地机器上轮换和拆解实验室环境，而不需要访问内部实验室或公共云。
|
||||
|
||||
本文将解释如何在 20 分钟内以完全自动化的方式在本地机器上部署自己的实验室环境。
|
||||
|
||||
你可以在我的 [GitHub 仓库][3]中找到这个练习的所有代码。
|
||||
|
||||
### 工具和软件
|
||||
|
||||
本方案使用以下工具和软件：
|
||||
|
||||
* [Ansible][4] 是我们选择的自动化工具，因为它易于使用，而且足够灵活，可以满足实验室的要求。
|
||||
* [Vagrant][5] 易于使用，用于构建和维护虚拟机。
|
||||
* [VirtualBox][6] 是一个托管管理程序，可以在 Windows 和 Linux 环境中使用。
|
||||
* [Fedora v30+][7] 是我本地机器上的操作系统。
|
||||
|
||||
你必须进行以下设置才能建立环境：
|
||||
|
||||
* 一个互联网连接
|
||||
* 在 BIOS 中启用虚拟化技术支持（以下是在我的联想笔记本上的[过程][8]）
|
||||
* Vagrant v2.2.9
|
||||
* 最新版本的 Ansible
|
||||
* 最新版本的 VirtualBox
|
||||
* Fedora v30+ 宿主机操作系统
|
||||
|
||||
### 这个实验室环境有什么？
|
||||
|
||||
这个项目旨在部署一个带有 Ansible 引擎和多个 Linux 节点的 Ansible 主机，以及一些预加载和预配置的应用程序（httpd 和 MySQL）。它还启用了 [Cockpit][9]，这样你就可以在测试过程中监控虚拟机（VM）的状态。使用预部署的应用程序的原因是为了提高效率（所以你不必花时间安装这些组件）。这样你就可以专注于创建角色和剧本，并针对上述工具部署的环境进行测试。
|
||||
|
||||
我们确定，对于我们的用例来说，最好的方案是多机 Vagrant 环境。Vagrant 文件创建了三个 CentOS 虚拟机，以模拟两个目标主机和一个 Ansible 控制机。
|
||||
|
||||
* Host1: 没有图形用户界面（GUI），安装 httpd 和 MySQL
|
||||
* Host2: 没有 GUI，安装了 httpd 和 MySQL
|
||||
* Ansible-host：没有 GUI，安装了 Ansible 引擎
|
||||
|
||||
### 启用多个管理程序
|
||||
|
||||
如果使用了多个管理程序，一些管理程序可能不允许你拉起虚拟机。要解决这个问题，请遵循以下步骤（基于 Vagrant 的[安装][10]说明）。
|
||||
|
||||
首先，找出管理程序的名称：
|
||||
|
||||
```
|
||||
$ lsmod | grep kvm
|
||||
kvm_intel 204800 6
|
||||
kvm 593920 1 kvm_intel
|
||||
irqbypass 16384 1 kvm
|
||||
```
|
||||
|
||||
我感兴趣的是 `kvm_intel`，但你可能需要另一个（比如 `kvm_amd`）。
|
||||
|
||||
以 root 身份运行以下内容，将该管理程序列入黑名单：
|
||||
|
||||
```
|
||||
$ echo 'blacklist kvm-intel' >> /etc/modprobe.d/blacklist.conf
|
||||
```
|
||||
|
||||
重新启动你的机器并尝试再次运行 Vagrant。
|
||||
|
||||
### Vagrant 文件
|
||||
|
||||
```
|
||||
cat Vagrantfile
|
||||
```
|
||||
|
||||
```
|
||||
# -*- mode: ruby -*-
|
||||
# vi: set ft=ruby :
|
||||
|
||||
Vagrant.configure("2") do |config|
|
||||
# Define VMs with static private IP addresses, vcpu, memory and vagrant-box.
|
||||
boxes = [
|
||||
{
|
||||
:name => "web1.demo.com", ⇒ Host1 this is one of the target nodes
|
||||
:box => "centos/8", ⇒ OS version
|
||||
:ram => 1024, ⇒ Allocated memory
|
||||
:vcpu => 1, ⇒ Allocated CPU
|
||||
:ip => "192.168.29.2" ⇒ Allocated IP address of the node
|
||||
},
|
||||
{
|
||||
:name => "web2.demo.com", ⇒ Host2 this is one of the target nodes
|
||||
:box => "centos/8",
|
||||
:ram => 1024,
|
||||
:vcpu => 1,
|
||||
:ip => "192.168.29.3"
|
||||
},
|
||||
{
|
||||
:name => "ansible-host", ⇒ Ansible Host with Ansible Engine
|
||||
:box => "centos/8",
|
||||
:ram => 8048,
|
||||
:vcpu => 1,
|
||||
:ip => "192.168.29.4"
|
||||
}
|
||||
]
|
||||
|
||||
# Provision each of the VMs.
|
||||
boxes.each do |opts|
|
||||
config.vm.define opts[:name] do |config|
|
||||
# Only Enable this if you are connecting to Proxy server
|
||||
# config.proxy.http = "http://usernam:password@x.y:80"⇒ Needed if you have a proxy
|
||||
# config.proxy.https = "http://usernam:password@x.y:80"
|
||||
# config.proxy.no_proxy = "localhost,127.0.0.1"
|
||||
config.vm.synced_folder ".", "/vagrant", id: "vagrant-root", disabled: true
|
||||
config.ssh.insert_key = false
|
||||
config.vm.box = opts[:box]
|
||||
config.vm.hostname = opts[:name]
|
||||
config.vm.provider :virtualbox do |v| ⇒ Defines the vagrant provider
|
||||
v.memory = opts[:ram]
|
||||
v.cpus = opts[:vcpu]
|
||||
end
|
||||
config.vm.network :private_network, ip: opts[:ip]
|
||||
config.vm.provision :file do |file|
|
||||
file.source = './keys/vagrant' ⇒ vagrant keys to allow access to the nodes
|
||||
file.destination = '/tmp/vagrant' ⇒ the location to copy the vagrant key
|
||||
end
|
||||
config.vm.provision :shell, path: "bootstrap-node.sh" ⇒ script that copy hosts entry
|
||||
config.vm.provision :ansible do |ansible| ⇒ declaration to run ansible playbook
|
||||
ansible.verbose = "v"
|
||||
ansible.playbook = "playbook.yml" ⇒ the playbook used to configure the hosts
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
```
|
||||
|
||||
这些是你需要注意的重要文件。
|
||||
|
||||
* `inventory-test.yaml`：连接到节点的清单文件
|
||||
* `playbook.yaml`：Vagrant 供应者调用的用于配置节点的剧本文件
|
||||
* `Vagrantfile'：Vagrant 用来部署环境的文件
|
||||
* Vagrant 密钥文件：连接实验室环境中各节点的 Vagrant 密钥
|
||||
|
||||
你可以根据你的需要调整这些文件。Ansible 的灵活性使你有能力根据你的需要声明性地改变你的环境。
|
||||
|
||||
### 部署你的实验室环境
|
||||
|
||||
首先，克隆这个 [GitHub 仓库][11] 中的代码：
|
||||
|
||||
```
|
||||
$ git clone https://github.com/mikecali/ansible-labs-101.git
|
||||
Cloning into 'ansible-labs-101'...
|
||||
remote: Enumerating objects: 15, done.
|
||||
remote: Counting objects: 100% (15/15), done.
|
||||
remote: Compressing objects: 100% (13/13), done.
|
||||
remote: Total 15 (delta 2), reused 10 (delta 0), pack-reused 0
|
||||
Unpacking objects: 100% (15/15), 6.82 KiB | 634.00 KiB/s, done.
|
||||
```
|
||||
|
||||
接下来，将你的目录改为 `vagrant-session-2`，并查看其内容：
|
||||
|
||||
```
|
||||
$ ls
|
||||
Bootstrap-node.sh inventory keys playbook.yml README.md Vagrantfile
|
||||
```
|
||||
|
||||
现在你已经拥有了实验室环境所需的所有工件和配置文件。要部署环境，请运行：
|
||||
|
||||
```
|
||||
$ vagrant up
|
||||
```
|
||||
|
||||
只要有一个像样的网络连接，只需要 20 分钟左右就可以得到一个运行环境：
|
||||
|
||||
```
|
||||
$ vagrant up
|
||||
Bringing machine 'web1.demo.com' up with 'virtualbox' provider...
|
||||
Bringing machine 'web2.demo.com' up with 'virtualbox' provider...
|
||||
Bringing machine 'ansible-host' up with 'virtualbox' provider...
|
||||
==> web1.demo.com: Importing base box 'centos/8'...
|
||||
==> web1.demo.com: Matching MAC address for NAT networking...
|
||||
==> web1.demo.com: Checking if box 'centos/8' version '1905.1' is up to date...
|
||||
==> web1.demo.com: Setting the name of the VM: ansible-labs_web1democom_1606434176593_70913
|
||||
==> web1.demo.com: Clearing any previously set network interfaces...
|
||||
==> web1.demo.com: Preparing network interfaces based on configuration...
|
||||
web1.demo.com: Adapter 1: nat
|
||||
web1.demo.com: Adapter 2: hostonly
|
||||
==> web1.demo.com: Forwarding ports...
|
||||
web1.demo.com: 22 (guest) => 2222 (host) (adapter 1)
|
||||
==> web1.demo.com: Running 'pre-boot' VM customizations...
|
||||
==> web1.demo.com: Booting VM...
|
||||
==> web1.demo.com: Waiting for machine to boot. This may take a few minutes...
|
||||
web1.demo.com: SSH address: 127.0.0.1:2222
|
||||
web1.demo.com: SSH username: vagrant
|
||||
web1.demo.com: SSH auth method: private key
|
||||
[...]
|
||||
```
|
||||
|
||||
一旦该剧本执行完成，你会看到这样的输出：
|
||||
|
||||
```
|
||||
PLAY RECAP *********************************
|
||||
Ansible-host : ok=20 changed=11 unreachable=0 failed=0 skipped=0 rescued=0 ignored=3
|
||||
|
||||
Real 18m14.288s
|
||||
User 2m26.978s
|
||||
Sys 0m26.849s
|
||||
```
|
||||
|
||||
确认所有虚拟机都在运行：
|
||||
|
||||
```
|
||||
$ vagrant status
|
||||
Current machine states:
|
||||
|
||||
Web1.demo.com running (virtualbox)
|
||||
Web2.demo.com running (virtualbox)
|
||||
ansible-host running (virtualbox)
|
||||
[...]
|
||||
```
|
||||
|
||||
你可以通过登录其中一个虚拟机进一步调查。访问 `ansible-host`：
|
||||
|
||||
```
|
||||
> vagrant ssh ansible-host
|
||||
Activate the web console with: systemctl enable --now cockpit.socket
|
||||
|
||||
Last login: Thu Nov 26 12:21:23 2020 from 10.0.2.2
|
||||
[vagrant@ansible-host ~] uptime
|
||||
16:46:42 up 1:24, 1 user, load average: 0.00, 0.01, 0.04
|
||||
```
|
||||
|
||||
最后，你可以使用 Ansible 模块来 ping 你创建的其他节点：
|
||||
|
||||
```
|
||||
[vagrant@ansible-host]$ ansible -i inventory-test.yaml \
|
||||
webservers -m ping -u vagrant
|
||||
192.168.29.2 | SUCCESS => {
|
||||
"Ansible-facts": {
|
||||
"Discovered_interpreter_python": "/usr/libexec/platform-python"
|
||||
},
|
||||
"Changed": false;
|
||||
"Ping": "pong"
|
||||
}
|
||||
[...]
|
||||
```
|
||||
|
||||
### 清理
|
||||
|
||||
运行如下命令来清理环境：
|
||||
|
||||
```
|
||||
$ vagrant destroy [vagrant machine name]
|
||||
```
|
||||
|
||||
你的输出会像这样：
|
||||
|
||||
![Output from cleaning up environment][12]
|
||||
|
||||
### 有创意的学习
|
||||
|
||||
在自己的实验室里利用自己的时间学习 Ansible 这样的软件是一个好习惯，但由于受到无法控制的限制，可能会很困难。
|
||||
|
||||
有时候，你需要发挥创意，找到另一种方法。在开源社区中，你可以选择很多方案；我们选择这些工具的主要原因之一是，它们是许多人常用和熟悉的。
|
||||
|
||||
另外，请注意，这些剧本并没有按照我的要求进行优化。请随时改进它们，并在评论中分享你的工作。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/article/20/12/ansible-lab
|
||||
|
||||
作者：[Mike Calizo][a]
|
||||
选题：[lujun9972][b]
|
||||
译者：[wxy](https://github.com/wxy)
|
||||
校对：[wxy](https://github.com/wxy)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]: https://opensource.com/users/mcalizo
|
||||
[b]: https://github.com/lujun9972
|
||||
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/science_experiment_beaker_lab.png?itok=plKWRhlU (Science lab with beakers)
|
||||
[2]: https://opensource.com/resources/what-ansible
|
||||
[3]: https://github.com/mikecali/ansible-labs-101
|
||||
[4]: https://www.ansible.com/
|
||||
[5]: https://www.vagrantup.com/
|
||||
[6]: https://www.virtualbox.org/
|
||||
[7]: https://getfedora.org/
|
||||
[8]: https://support.lenovo.com/pt/en/solutions/ht500006
|
||||
[9]: https://opensource.com/article/20/11/cockpit-server-management
|
||||
[10]: https://www.vagrantup.com/docs/installation
|
||||
[11]: https://github.com/mikecali/ansible-labs-101.git
|
||||
[12]: https://opensource.com/sites/default/files/uploads/cleanup.png (Output from cleaning up environment)
|
||||
[13]: https://creativecommons.org/licenses/by-sa/4.0/
|
||||
@ -1,318 +0,0 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: ( )
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
[#]: subject: (Set up an Ansible lab in 20 minutes)
|
||||
[#]: via: (https://opensource.com/article/20/12/ansible-lab)
|
||||
[#]: author: (Mike Calizo https://opensource.com/users/mcalizo)
|
||||
|
||||
Set up an Ansible lab in 20 minutes
|
||||
======
|
||||
Build an environment to support learning and experimenting with new
|
||||
software.
|
||||
![Science lab with beakers][1]
|
||||
|
||||
Being able to build and tear down a public cloud environment is very useful, but most of us don’t have easy access to a public cloud. The next best thing would be to have a lab on your local machine, but even running on a local machine brings performance, flexibility, and other challenges. Most of the time, the additional workloads on our local machines interfere with doing our daily job, and they certainly prevent having a readily available environment to play and experiment with new software.
|
||||
|
||||
My team and I encountered this challenge a few years ago when we were starting to learn [Ansible][2]. We couldn’t find an environment that we could use individually, and our frustration with the situation caused some of us to stop experimenting. We knew we needed to find a solution.
|
||||
|
||||
We spent a lot of time researching the options and came up with a set of tools that enable our curiosity to learn in an environment we fully control. We can spin up and tear down the lab environment on our local machines without needing access to on-premises labs or public clouds.
|
||||
|
||||
This article will explain how to deploy your own lab environment on your local machine in as little as 20 minutes in a fully automated way.
|
||||
|
||||
You can find all the code for this exercise in my [GitHub repository][3].
|
||||
|
||||
### Tools and software
|
||||
|
||||
This solution uses the following tools and software:
|
||||
|
||||
* [Ansible][4] is our automation tool of choice because it’s easy to use and flexible enough to handle the lab requirements.
|
||||
* [Vagrant][5] is easy to use for building and maintaining virtual machines.
|
||||
* [VirtualBox][6] is a hosted hypervisor that works in Windows and Linux environments.
|
||||
* [Fedora v30+][7] is the operating system on my local machine.
|
||||
|
||||
|
||||
|
||||
You must have the following set up to build the environment:
|
||||
|
||||
* An internet connection
|
||||
* Virtualization Technology support enabled in your BIOS (here is the [procedure][8] for my Lenovo laptop)
|
||||
* Vagrant v2.2.9
|
||||
* The latest version of Ansible
|
||||
* The latest version of VirtualBox
|
||||
* Fedora v30+ host operating system
|
||||
|
||||
|
||||
|
||||
### What’s in the lab environment?
|
||||
|
||||
This project aims to deploy an Ansible host with an Ansible engine and multiple Linux nodes along with some pre-loaded and pre-configured applications (httpd and MySQL). It also enables [Cockpit][9] so that you can monitor the status of the virtual machines (VMs) during testing. The reason to use a pre-deployed application is for efficiency (so you don’t have to spend time installing those components). This allows you to focus on creating roles and playbooks and testing against the environments deployed by the tools listed above.
|
||||
|
||||
We determined that the best scenario for our use case was a multi-machine Vagrant environment. The Vagrantfile creates three CentOS VMs to simulate two target hosts and an Ansible control machine:
|
||||
|
||||
* Host1: No graphical user interface (GUI), with httpd and MySQL installed
|
||||
* Host2: No GUI, with httpd and MySQL installed
|
||||
* Ansible-host: No GUI, with Ansible engine installed
|
||||
|
||||
|
||||
|
||||
### Enable multiple hypervisors
|
||||
|
||||
Some hypervisors may not allow you to bring up VMs if more than one hypervisor is in use. To fix this problem, follow these steps (based on Vagrant’s [installation][10] instructions).
|
||||
|
||||
First, find out the name of the hypervisor:
|
||||
|
||||
|
||||
```
|
||||
$ lsmod | grep kvm
|
||||
kvm_intel 204800 6
|
||||
kvm 593920 1 kvm_intel
|
||||
irqbypass 16384 1 kvm
|
||||
```
|
||||
|
||||
The one I’m interested in is `kvm_intel`, but you might want another (such as `kvm_amd`).
|
||||
|
||||
Run the following as root to blacklist the hypervisor:
|
||||
|
||||
|
||||
```
|
||||
`$ echo 'blacklist kvm-intel' >> /etc/modprobe.d/blacklist.conf`
|
||||
```
|
||||
|
||||
Restart your machine and try running Vagrant again.
|
||||
|
||||
### The Vagrant file
|
||||
|
||||
|
||||
```
|
||||
cat Vagrantfile
|
||||
# -*- mode: ruby -*-
|
||||
# vi: set ft=ruby :
|
||||
|
||||
Vagrant.configure("2") do |config|
|
||||
# Define VMs with static private IP addresses, vcpu, memory and vagrant-box.
|
||||
boxes = [
|
||||
{
|
||||
:name => "web1.demo.com", ⇒ Host1 this is one of the target nodes
|
||||
:box => "centos/8", ⇒ OS version
|
||||
:ram => 1024, ⇒ Allocated memory
|
||||
:vcpu => 1, ⇒ Allocated CPU
|
||||
:ip => "192.168.29.2" ⇒ Allocated IP address of the node
|
||||
},
|
||||
{
|
||||
:name => "web2.demo.com", ⇒ Host2 this is one of the target nodes
|
||||
:box => "centos/8",
|
||||
:ram => 1024,
|
||||
:vcpu => 1,
|
||||
:ip => "192.168.29.3"
|
||||
},
|
||||
{
|
||||
:name => "ansible-host", ⇒ Ansible Host with Ansible Engine
|
||||
:box => "centos/8",
|
||||
:ram => 8048,
|
||||
:vcpu => 1,
|
||||
:ip => "192.168.29.4"
|
||||
}
|
||||
]
|
||||
|
||||
# Provision each of the VMs.
|
||||
boxes.each do |opts|
|
||||
config.vm.define opts[:name] do |config|
|
||||
# Only Enable this if you are connecting to Proxy server
|
||||
# config.proxy.http = "<http://usernam:password@x.y:80"⇒> Needed if you have a proxy
|
||||
# config.proxy.https = "<http://usernam:password@x.y:80>"
|
||||
# config.proxy.no_proxy = "localhost,127.0.0.1"
|
||||
config.vm.synced_folder ".", "/vagrant", id: "vagrant-root", disabled: true
|
||||
config.ssh.insert_key = false
|
||||
config.vm.box = opts[:box]
|
||||
config.vm.hostname = opts[:name]
|
||||
config.vm.provider :virtualbox do |v| ⇒ Defines the vagrant provider
|
||||
v.memory = opts[:ram]
|
||||
v.cpus = opts[:vcpu]
|
||||
end
|
||||
config.vm.network :private_network, ip: opts[:ip]
|
||||
config.vm.provision :file do |file|
|
||||
file.source = './keys/vagrant' ⇒ vagrant keys to allow access to the nodes
|
||||
file.destination = '/tmp/vagrant' ⇒ the location to copy the vagrant key
|
||||
end
|
||||
config.vm.provision :shell, path: "bootstrap-node.sh" ⇒ script that copy hosts entry
|
||||
config.vm.provision :ansible do |ansible| ⇒ declaration to run ansible playbook
|
||||
ansible.verbose = "v"
|
||||
ansible.playbook = "playbook.yml" ⇒ the playbook used to configure the hosts
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
```
|
||||
|
||||
These are the important files that you need to pay attention to:
|
||||
|
||||
* `inventory-test.yaml`: The inventory file to connect to the nodes
|
||||
* `playbook.yaml`: The playbook file that Vagrant provisioner calls to configure the nodes
|
||||
* `Vagrantfile`: The file that Vagrant uses to deploy the environment
|
||||
* `vagrant keys`: The Vagrant keys for connecting to the nodes in your lab environment
|
||||
|
||||
|
||||
|
||||
You can adjust these files based on your needs. Ansible’s flexibility gives you the power to declaratively change your environment as you require.
|
||||
|
||||
### Deploy your lab environment
|
||||
|
||||
First, clone the code from the [GitHub repo][11]:
|
||||
|
||||
|
||||
```
|
||||
$ git clone <https://github.com/mikecali/ansible-labs-101.git>
|
||||
Cloning into 'ansible-labs-101'...
|
||||
remote: Enumerating objects: 15, done.
|
||||
remote: Counting objects: 100% (15/15), done.
|
||||
remote: Compressing objects: 100% (13/13), done.
|
||||
remote: Total 15 (delta 2), reused 10 (delta 0), pack-reused 0
|
||||
Unpacking objects: 100% (15/15), 6.82 KiB | 634.00 KiB/s, done.
|
||||
```
|
||||
|
||||
Next, change your directory to `vagrant-session-2`, and view its contents:
|
||||
|
||||
|
||||
```
|
||||
$ ls
|
||||
Bootstrap-node.sh inventory keys playbook.yml README.md Vagrantfile
|
||||
```
|
||||
|
||||
You now have all the artifacts and configuration files you need for your lab environment. To deploy your environment, run:
|
||||
|
||||
|
||||
```
|
||||
`$ vagrant up`
|
||||
```
|
||||
|
||||
With a decent internet connection, it takes only about 20 minutes to get a running environment:
|
||||
|
||||
|
||||
```
|
||||
$ vagrant up
|
||||
Bringing machine 'web1.demo.com' up with 'virtualbox' provider...
|
||||
Bringing machine 'web2.demo.com' up with 'virtualbox' provider...
|
||||
Bringing machine 'ansible-host' up with 'virtualbox' provider...
|
||||
==> web1.demo.com: Importing base box 'centos/8'...
|
||||
==> web1.demo.com: Matching MAC address for NAT networking...
|
||||
==> web1.demo.com: Checking if box 'centos/8' version '1905.1' is up to date...
|
||||
==> web1.demo.com: Setting the name of the VM: ansible-labs_web1democom_1606434176593_70913
|
||||
==> web1.demo.com: Clearing any previously set network interfaces...
|
||||
==> web1.demo.com: Preparing network interfaces based on configuration...
|
||||
web1.demo.com: Adapter 1: nat
|
||||
web1.demo.com: Adapter 2: hostonly
|
||||
==> web1.demo.com: Forwarding ports...
|
||||
web1.demo.com: 22 (guest) => 2222 (host) (adapter 1)
|
||||
==> web1.demo.com: Running 'pre-boot' VM customizations...
|
||||
==> web1.demo.com: Booting VM...
|
||||
==> web1.demo.com: Waiting for machine to boot. This may take a few minutes...
|
||||
web1.demo.com: SSH address: 127.0.0.1:2222
|
||||
web1.demo.com: SSH username: vagrant
|
||||
web1.demo.com: SSH auth method: private key
|
||||
[...]
|
||||
```
|
||||
|
||||
Once the playbook execution completes, you will see output like this:
|
||||
|
||||
|
||||
```
|
||||
PLAY RECAP *********************************
|
||||
Ansible-host : ok=20 changed=11 unreachable=0 failed=0 skipped=0 rescued=0 ignored=3
|
||||
|
||||
Real 18m14.288s
|
||||
User 2m26.978s
|
||||
Sys 0m26.849s
|
||||
```
|
||||
|
||||
Verify that all VMs are running:
|
||||
|
||||
|
||||
```
|
||||
$ vagrant status
|
||||
Current machine states:
|
||||
|
||||
Web1.demo.com running (virtualbox)
|
||||
Web2.demo.com running (virtualbox)
|
||||
ansible-host running (virtualbox)
|
||||
[...]
|
||||
```
|
||||
|
||||
You can investigate further by logging into one of the VMs. Access the ansible-host:
|
||||
|
||||
|
||||
```
|
||||
> vagrant ssh ansible-host
|
||||
Activate the web console with: systemctl enable --now cockpit.socket
|
||||
|
||||
Last login: Thu Nov 26 12:21:23 2020 from 10.0.2.2
|
||||
[vagrant@ansible-host ~] uptime
|
||||
16:46:42 up 1:24, 1 user, load average: 0.00, 0.01, 0.04
|
||||
```
|
||||
|
||||
Finally, you can use the Ansible module to ping the other nodes you created:
|
||||
|
||||
|
||||
```
|
||||
[vagrant@ansible-host]$ ansible -i inventory-test.yaml \
|
||||
webservers -m ping -u vagrant
|
||||
192.168.29.2 | SUCCESS => {
|
||||
"Ansible-facts": {
|
||||
"Discovered_interpreter_python": "/usr/libexec/platform-python"
|
||||
},
|
||||
"Changed": false;
|
||||
"Ping": "pong"
|
||||
}
|
||||
[...]
|
||||
```
|
||||
|
||||
### Clean up
|
||||
|
||||
Clean up your environment by running:
|
||||
|
||||
|
||||
```
|
||||
`$ vagrant destroy [vagrant machine name]`
|
||||
```
|
||||
|
||||
Your output will look like this:
|
||||
|
||||
![Output from cleaning up environment][12]
|
||||
|
||||
(Michael Calizo, [CC BY-SA 4.0][13])
|
||||
|
||||
### Get creative to learn
|
||||
|
||||
Learning software like Ansible on your own time in your own lab is a good habit, but it can be difficult because of constraints that are out of your control.
|
||||
|
||||
Sometimes, you need to get creative and find another way. There are many options in the open source community you can choose from; one of the main reasons we picked these tools is because they are commonly used and familiar to many people.
|
||||
|
||||
Also, please note that these playbooks are not as optimized as I want. Please feel free to improve them and share your work in the comments.
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/article/20/12/ansible-lab
|
||||
|
||||
作者：[Mike Calizo][a]
|
||||
选题：[lujun9972][b]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]: https://opensource.com/users/mcalizo
|
||||
[b]: https://github.com/lujun9972
|
||||
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/science_experiment_beaker_lab.png?itok=plKWRhlU (Science lab with beakers)
|
||||
[2]: https://opensource.com/resources/what-ansible
|
||||
[3]: https://github.com/mikecali/ansible-labs-101
|
||||
[4]: https://www.ansible.com/
|
||||
[5]: https://www.vagrantup.com/
|
||||
[6]: https://www.virtualbox.org/
|
||||
[7]: https://getfedora.org/
|
||||
[8]: https://support.lenovo.com/pt/en/solutions/ht500006
|
||||
[9]: https://opensource.com/article/20/11/cockpit-server-management
|
||||
[10]: https://www.vagrantup.com/docs/installation
|
||||
[11]: https://github.com/mikecali/ansible-labs-101.git
|
||||
[12]: https://opensource.com/sites/default/files/uploads/cleanup.png (Output from cleaning up environment)
|
||||
[13]: https://creativecommons.org/licenses/by-sa/4.0/
|
||||
@ -1,114 +0,0 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: (geekpi)
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
[#]: subject: (Learn Python by coding a simple game)
|
||||
[#]: via: (https://opensource.com/article/20/12/learn-python)
|
||||
[#]: author: (Moshe Zadka https://opensource.com/users/moshez)
|
||||
|
||||
Learn Python by coding a simple game
|
||||
======
|
||||
Explore Python (and other programming languages) by writing a "guess the
|
||||
number" game.
|
||||
![Python programming language logo with question marks][1]
|
||||
|
||||
In this series, we're writing the same application in different programming languages to compare how various languages work and to show how using a standard test program is a great way to learn new ways to program.
|
||||
|
||||
When you learn a new programming language, it's good to focus on the things they have in common. Variables, expressions, and statements are the basis of most programming languages. Once you understand these concepts, you can start figuring the rest out.
|
||||
|
||||
Because programming languages share many similarities, once you know one, you can usually learn the basics of another by looking at how it differs from what you know. Using a standard test program you've written in other languages enables you to focus on the language, not the program's logic.
|
||||
|
||||
To prove this point, we're testing how to write a "guess the number" program in multiple languages. The computer picks a number between one and 100 and asks you to guess it. The program loops until you guess the correct answer.
|
||||
|
||||
The "guess the number" program exercises several concepts in programming languages:
|
||||
|
||||
* Variables
|
||||
* Input
|
||||
* Output
|
||||
* Conditional evaluation
|
||||
* Loops
|
||||
|
||||
|
||||
|
||||
It's a great practical experiment to learn a new programming language.
|
||||
|
||||
### Guess the number in Python
|
||||
|
||||
In the words of the [Python Software Foundation][2]: "Python is an interpreted, interactive, object-oriented programming language. It incorporates modules, exceptions, dynamic typing, very high-level dynamic data types, and classes." It's a great general-purpose programming language that's useful for everything from simple scripts to complex GUI applications.
|
||||
|
||||
You can explore Python by writing a version of the "guess the number" game. Here is my implementation:
|
||||
|
||||
|
||||
```
|
||||
import random as randomlib
|
||||
random = randomlib.randint(1, 100)
|
||||
print("Guess a number between 1 and 100")
|
||||
while True:
|
||||
guess = int(input())
|
||||
if guess < random:
|
||||
print("Too low")
|
||||
elif guess > random:
|
||||
print("Too high")
|
||||
else:
|
||||
print("That's right!")
|
||||
break
|
||||
```
|
||||
|
||||
To assign a value to a variable, list the variable's name, followed by the `=` sign. For example, the statement `random = 0` assigns a zero value to the `random` variable.
|
||||
|
||||
The first line of the script imports the `random` module. Since all the programs in this series use `random` as the name of the variable, you can use `import random as randomlib` to import it under an alias to avoid name conflicts.
|
||||
|
||||
Few functions are built into Python; most have to be imported explicitly from the standard library. The `random` standard library module has the functionality to generate all kinds of random values.
|
||||
|
||||
The second line of the script reads the result of the function `randint()` and assigns it to the variable called `random`. The function takes two arguments: a minimum and a maximum. In this case, the range is `1` to `100`, making the game just challenging enough.
|
||||
|
||||
You can also prompt the user to enter a value using the `input()` function. If you write `guess = int(input())`, Python waits for the user to enter some text, converts it to an integer, and then stores that value in the guess variable.
|
||||
|
||||
Python supports conditional expressions and flow control like loops. In the "guess the number" game, Python continues looping as long as the value in guess is not equal to `random`.
|
||||
|
||||
If the guess is less than the random number, Python prints `Too low`, and if the guess is greater than the number, Python prints `Too high`.
|
||||
|
||||
### Sample output
|
||||
|
||||
Now that you've written your Python program, run it to play the "guess the number" game. Every time you run the program, Python will pick a different random number. To complete this game, you need to guess until you find the correct number:
|
||||
|
||||
|
||||
```
|
||||
$ python guess.py
|
||||
Guess a number between 1 and 100
|
||||
50
|
||||
Too high
|
||||
25
|
||||
Too high
|
||||
12
|
||||
Too high
|
||||
7
|
||||
Too high
|
||||
3
|
||||
Too low
|
||||
5
|
||||
Too low
|
||||
6
|
||||
That's right!
|
||||
```
|
||||
|
||||
This "guess the number" game is a great introductory program when learning a new programming language because it exercises several common programming concepts in a pretty straightforward way. By implementing this simple game in different programming languages, you can demonstrate some core concepts of different programming languages and compare each language's details.
|
||||
|
||||
Do you have a favorite programming language? How would you write the "guess the number" game? Follow this article series to see examples of other programming languages that might interest you!
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/article/20/12/learn-python
|
||||
|
||||
作者：[Moshe Zadka][a]
|
||||
选题：[lujun9972][b]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]: https://opensource.com/users/moshez
|
||||
[b]: https://github.com/lujun9972
|
||||
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/python_programming_question.png?itok=cOeJW-8r (Python programming language logo with question marks)
|
||||
[2]: https://docs.python.org/3/faq/general.html#general-information
|
||||
@ -1,5 +1,5 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: ( )
|
||||
[#]: translator: (geekpi)
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
|
||||
113
translated/tech/20201228 Learn Python by coding a simple game.md
Normal file
113
translated/tech/20201228 Learn Python by coding a simple game.md
Normal file
@ -0,0 +1,113 @@
|
||||
[#]: collector: (lujun9972)
|
||||
[#]: translator: (geekpi)
|
||||
[#]: reviewer: ( )
|
||||
[#]: publisher: ( )
|
||||
[#]: url: ( )
|
||||
[#]: subject: (Learn Python by coding a simple game)
|
||||
[#]: via: (https://opensource.com/article/20/12/learn-python)
|
||||
[#]: author: (Moshe Zadka https://opensource.com/users/moshez)
|
||||
|
||||
编写一个简单的游戏来学习 Python
|
||||
======
|
||||
通过编写一个”猜数字“游戏来探索 Python（和其他编程语言）。
|
||||
![Python programming language logo with question marks][1]
|
||||
|
||||
在这个系列中，我们要用不同的编程语言编写相同的应用，以比较各种语言是如何工作的，并说明使用标准测试程序是学习新编程好方法。
|
||||
|
||||
当你学习一门新的编程语言时，关注它们的共同点是件好事。变量、表达式和语句是大多数编程语言的基础。一旦你理解了这些概念，你就可以开始弄清楚其余的东西。
|
||||
|
||||
因为编程语言有许多相似之处，一旦你知道一种语言，你通常可以通过观察它与你所知道的语言的不同之处来学习另一种语言的基础知识。使用你用其他语言编写的标准测试程序，可以让你专注于语言，而不是程序的逻辑。
|
||||
|
||||
为了证明这点，我们正在测试如何用多种语言编写一个”猜数字“程序。计算机选择一个 1 到 100 之间的数字，然后让你猜。程序循环，直到你猜出正确答案。
|
||||
|
||||
”猜数字“程序练习了编程语言的几个概念：
|
||||
|
||||
* 变量
|
||||
* 输入
|
||||
* 输出
|
||||
* 条件判断
|
||||
* 循环
|
||||
|
||||
|
||||
|
||||
这是一个很好的学习新编程语言的实践实验。
|
||||
|
||||
### 用 Python 猜数字
|
||||
|
||||
用 [Python 软件基金会][2]的话来说。”Python 是一种解释的、交互式的、面向对象的程序设计语言，它包含了模块、异常、动态类型、非常高层的动态数据类型和类。“它是一种很好的通用编程语言，从简单的脚本到复杂的 GUI 应用都很有用。
|
||||
|
||||
你可以通过编写一个版本的”猜数字“游戏来探索 Python。这是我的实现：
|
||||
|
||||
|
||||
```
|
||||
import random as randomlib
|
||||
random = randomlib.randint(1, 100)
|
||||
print("Guess a number between 1 and 100")
|
||||
while True:
|
||||
guess = int(input())
|
||||
if guess < random:
|
||||
print("Too low")
|
||||
elif guess > random:
|
||||
print("Too high")
|
||||
else:
|
||||
print("That's right!")
|
||||
break
|
||||
```
|
||||
|
||||
要给一个变量赋值，请列出变量的名称，然后是 `=` 号。例如，语句 `random = 0` 给 `random` 变量分配一个零值。
|
||||
|
||||
脚本的第一行就导入了 `random` 模块。由于本系列中的所有程序都使用 `random` 作为变量的名称，你可以使用 `import random as randomlib` 以别名导入它，以避免命名冲突。
|
||||
|
||||
很少有函数内置到 Python 中，大多数函数必须从标准库中显式导入。`random` 标准库模块有生成各种随机值的功能。
|
||||
|
||||
脚本的第二行读取函数 `randint()` 的结果，并将其赋值给名为 `random` 的变量。函数需要两个参数：一个最小值和一个最大值。在本例中，范围是 `1` 到 `100`，以使游戏具有足够的挑战性。
|
||||
|
||||
你也可以使用 `input()` 函数提示用户输入一个值。如果你写 `guess = int(input())`，Python 会等待用户输入一些文本，将其转换为一个整数，然后将值存储在 guess 变量中。
|
||||
|
||||
Python 支持条件表达式和循环等流程控制。在”猜数字“游戏中，只要 guess 中的值不等于 `random`，Python 就会继续循环。
|
||||
|
||||
如果猜测值小于随机数，Python 会打印 `Too low`，如果猜测值大于这个数字，Python 会打印 `Too high`。
|
||||
|
||||
### 示例输出
|
||||
|
||||
现在你已经写好了 Python 程序，运行它来玩”猜数字“游戏。每次运行程序，Python 都会随机选取一个不同的数字。为了完成这个游戏，你需要猜测，直到找到正确的数字：
|
||||
|
||||
|
||||
```
|
||||
$ python guess.py
|
||||
Guess a number between 1 and 100
|
||||
50
|
||||
Too high
|
||||
25
|
||||
Too high
|
||||
12
|
||||
Too high
|
||||
7
|
||||
Too high
|
||||
3
|
||||
Too low
|
||||
5
|
||||
Too low
|
||||
6
|
||||
That's right!
|
||||
```
|
||||
|
||||
在学习一门新的编程语言时，这个”猜数字“游戏是一个很好的入门程序，因为它以一种相当直接的方式练习了几个常见的编程概念。通过在不同的编程语言中实现这个简单的游戏，你可以展示不同编程语言的一些核心概念，并比较每种语言的细节。
|
||||
|
||||
你有喜欢的编程语言吗？你会如何编写”猜数字“游戏？请关注本系列文章，看看你可能感兴趣的其他编程语言的例子吧！
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://opensource.com/article/20/12/learn-python
|
||||
|
||||
作者：[Moshe Zadka][a]
|
||||
选题：[lujun9972][b]
|
||||
译者：[geekpi](https://github.com/geekpi)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]: https://opensource.com/users/moshez
|
||||
[b]: https://github.com/lujun9972
|
||||
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/python_programming_question.png?itok=cOeJW-8r (Python programming language logo with question marks)
|
||||
[2]: https://docs.python.org/3/faq/general.html#general-information
|
||||
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