Terraform系列三腾讯云CVM中的玩法

Posted 2022-04-04 saynaihe

背景：

紧接：Terraform系列一腾讯云CVM相关简单创建，Terraform系列二腾讯云CVM进一步相关玩法。cvm创建完成,准备初始化一下系统，挂载一下数据盘，在cvm中安装一些软件，做一些简单的配置！

Terraform系列三腾讯云CVM中的玩法

1. Terraform output

我们通过terraform创建了cvm相关资源,我们该如何获取cvm的相关信息呢？前面我都是登陆控制台后台查看的。我能不能通过terraform获取相关的我需要的信息输出呢？可以的！这里顺路提一下output…

1. 首先拿一个简单的例子来演示一下：

我需要打印出cvm_almalinux cvm云主机 的区域，id ，名称，公网ip相关信息。这样我就可以获取公网ip信息，不用去控制台查找ip信息，可以直接登陆服务器了。

1. cat output.tf

output "cvm_az" 
  value = "$tencentcloud_instance.cvm_almalinux.availability_zone"

output "cvm_id" 
  value = "$tencentcloud_instance.cvm_almalinux.id"
 
output "cvm_name" 
  value = "$tencentcloud_instance.cvm_almalinux.instance_name"
 
output "cvm_public_ip" 
  value = "$tencentcloud_eip.cvm_almalinux_eip.public_ip"

2. terraform apply and terraform out

这样我们就可以获取到服务器的公网ip了，可以至今ssh登陆服务器！当然了这里只是抛砖引玉。你可以通过output输出各种资源相关的信息-你所需要的！

3. terraform output 其他的用法

从腾讯云的腾讯云Terraform应用指南学到的

[root@zhangpeng terraform]# terraform output cvm_id
"ins-hsakr7ah"

同理也可以打印其他相关信息.了解一个命令的最好方法还是通过–hlep看文档

[root@zhangpeng terraform]# terraform output --help
Usage: terraform [global options] output [options] [NAME]

  Reads an output variable from a Terraform state file and prints
  the value. With no additional arguments, output will display all
  the outputs for the root module.  If NAME is not specified, all
  outputs are printed.

Options:

  -state=path      Path to the state file to read. Defaults to
                   "terraform.tfstate".

  -no-color        If specified, output won't contain any color.

  -json            If specified, machine readable output will be
                   printed in JSON format.

  -raw             For value types that can be automatically
                   converted to a string, will print the raw
                   string directly, rather than a human-oriented
                   representation of the value.

竟然可以json输出？体验一下！

[root@zhangpeng terraform]# terraform output -json

  "cvm_az": 
    "sensitive": false,
    "type": "string",
    "value": "ap-beijing-2"
  ,
  "cvm_id": 
    "sensitive": false,
    "type": "string",
    "value": "ins-hsxxxx"
  ,
  "cvm_name": 
    "sensitive": false,
    "type": "string",
    "value": "cvm-almalinux"
  ,
  "cvm_public_ip": 
    "sensitive": false,
    "type": "string",
    "value": "xxx.xxx.xxx.xxx"
  

更多的用法以后慢慢区发现了。这只是获取公网ip引申出来的！

2. 如何通过terraform给cvm运行shell

1. 格式化vdb并挂载到data目录

1. 创建格式化tf配置文件

cat mkfs.tf

resource "null_resource" "connect_private" 
  connection 
    host        = "$tencentcloud_eip.cvm_almalinux_eip.public_ip"
    type        = "ssh"
    user        = "root"
  

  # set hostname
  provisioner "remote-exec" 
    inline = [
      "sudo mkfs -t ext4 /dev/vdb",
      "sudo mkdir /data",
      "sudo mount /dev/vdb /data"
    ]
  

2. terraform plan and terraform init --upgrade

[root@zhangpeng terraform]# terraform plan

恩？提示我要uprade？什么鬼先执行一下！目测是要安装一个null的组件好吧…

[root@zhangpeng terraform]# terraform init --upgrade

3. terraform apply

[root@zhangpeng terraform]# terraform apply

我以为我设置免密不用设置私钥或者密码就可以的…这是不对的。设置一下私钥再走一遍！

4.正确的方式—特别强调

cat mkfs.tf

resource "null_resource" "connect_private" 
  connection 
    host        = "$tencentcloud_eip.cvm_almalinux_eip.public_ip"
    type        = "ssh"
    user        = "root"
    private_key = "$file("~/.ssh/id_rsa")"
  

  # set hostname
  provisioner "remote-exec" 
    inline = [
      "sudo mkfs -t ext4 /dev/vdb",
      "sudo mkdir /data",
      "sudo mount /dev/vdb /data"
    ]
  

注：增加了private_key配置

terraform plan and terraform apply

ssh登陆服务器查看验证：

[root@cvm-almalinux /]# lsblk

ok 格式化硬盘的任务就算是成功了!当然了也可以在remote-exec中将配置写入fstab防止服务器重启失效！

2.安装一个软件，比如nginx？

1. 创建nginx.tf配置文件

cat nginx.tf

resource "null_resource" "connect_private_nginx" 
  connection 
    host        = "$tencentcloud_eip.cvm_almalinux_eip.public_ip"
    type        = "ssh"
    user        = "root"
    private_key = "$file("~/.ssh/id_rsa")"
  

  # set hostname
  provisioner "remote-exec" 
    inline = [
      "sudo yum update -y",
      "sudo yum install nginx -y",
      "sudo systemctl start nginx"
    ]
  

2. terraform plan and terraform apply

install 滚动条一直0怎么会事情…登陆服务器查看一下

调用的是一个platform-python安装软件没有仔细区看接着等待ing…

连接不到yum源？突然就想到了防火墙…
果不其然，出口默认都是deny拒绝！

修改安全组配置文件如下：

[root@zhangpeng terraform]# cat security_group.tf 
resource "tencentcloud_security_group" "sg_bj" 
    name = "sg-bj"    


resource "tencentcloud_security_group_rule" "sg_bj_1" 
    security_group_id = "$tencentcloud_security_group.sg_bj.id"
    type = "ingress"
    cidr_ip = "0.0.0.0/0"
    ip_protocol = "tcp"
    port_range = "22,80"
    policy = "accept"

resource "tencentcloud_security_group_rule" "sg_bj_2" 
    security_group_id = "$tencentcloud_security_group.sg_bj.id"
    type = "egress"
    cidr_ip = "0.0.0.0/0"
    ip_protocol = "tcp"
    policy = "accept"

继续terrafrom plan terraform apply

进度条可以走了总算！等待任务结束

访问公网Ip nginx正常访问成功！

3.其他的方式？

不想讲脚本写在tf文件里面，我可不可以写一个shell脚本，然后用remote-exec去运行呢？可以的！安装一个httpd如下：

1. 编写install-http.sh脚本

install-httpd.sh

[root@k8s-master-01 terraform]# cat install-httpd.sh 
#!/bin/bash
systemctl stop nginx
yum install -y httpd
systemctl start httpd

注：主机名变了…放假回家拿另外服务器跑的。嗯id_isa也搞了过来！前面安装过nginx了不做复杂设置，先把！nginx停止了！

2. 编写httpd.tf

httpd.tf

resource "null_resource" "connect_private_httpd" 
  provisioner "file" 
    source = "install-httpd.sh"
    destination = "/tmp/install-httpd.sh"
  
  # set hostname
  provisioner "remote-exec" 
    inline = [
      "chmod +x /tmp/install-httpd.sh && sh /tmp/install-httpd.sh"
    ]
  
  connection 
    host        = "$tencentcloud_eip.cvm_almalinux_eip.public_ip"
    type        = "ssh"
    user        = "root"
    private_key = "$file("~/.ssh/id_rsa")"
  

3. terraform plain and terraform apply

[root@k8s-master-01 terraform]# terraform plan
[root@k8s-master-01 terraform]# terraform apply

访问80也是可以的。当然了复杂的脚本自己编写测试吧只是抛砖引玉！

另外看方法还有local-exec？看其他文章笔记还有ansible结合的？有时间都可以尝试一下

下一步的计划

1. 讲腾讯云后台的现有资源导出成terraform的配置。嗯就是导出资产…将资产统一管理一下配置即代码。
2. tf文件更规范的模块化管理？
3. 变量的更合理运用？
4. ansible或者其他软件的整合？
5. 日志输出的规范标准化