运维编排系列场景-----快速生成模版shell命令

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运维编排系列场景-----快速生成模版shell命令

无法重名的那个人 2019-09-06 18:30:39 浏览522
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应用场景

当通过模版的方式在一台机器上运行shell文件时,需要在模版中把当前的所有shell命令都需要手动操作写进模版中,并添加需要写入的shell文件,尤其是遇到一些需要转译的特殊字符时,还需要手改,操作较为浪费时间。

解决方案

把当前需要修改的shell命令写入一个本地shell文件,通过python脚本的方式来实现把此文件内的所有命令转化为某一种特定的形式,及解决转化后的脚本特殊字符写进模版中转译的问题,转化的脚本可以直接输入到模版中运行,并保留格式。

一、转化shell脚本
下面为用python实现的转化脚本,并将脚本命名为:oos_convert

import re
import sys

commands = sys.argv
# 要翻译的shell 脚本
file_path = '' or commands[1]


def translate():
    with open(file_path, 'r+', encoding='utf-8') as f:
        lines = f.readlines()
        for index, line in enumerate(lines):
            
            if index == 0:
                continue
                # print()
            new_line = repr(line).replace('\\t', '    ').replace('\\n', '').strip("'")
            if new_line.startswith('"'):
                print(new_line + ',')
            else:
                rep_line = new_line.replace('"', '\\"')
                print('"' + rep_line + '",')


translate()

Python脚本的运行方式:
运行命令:python oos_convert.py xxx.sh (例如:python oos_convert.py ~/command.sh)或者在pycharm等编辑工具中直接运行,在编辑工具中需要将file_path根据实际需求来补充。

如下所示为一个shell文件内的命令
1567761411992_ea00a2c9_4dcc_4b34_bec9_f876f1676f55

将以上python代码写入到一个自定义命名的py的文件中,在命令行中用python运行此文件,其运行结果如下所示,并将运行出来的结果复制到JSON格式的模版中。
1567761411992_ea00a2c9_4dcc_4b34_bec9_f876f1676f55

二、打开控制台,找到运维编排
1565003706926_e0d50d39_3648_406f_9d6f_97dd05fa5e4c

三、创建模版

1567761700289_99ff4a15_c204_4227_8561_a8f1f53307f0

按如下所示编辑模版,并将python脚本转化的内容,复制到下面的模版中。注意:此脚本转化的内容仅支持JSON格式。

{
    "FormatVersion": "OOS-2019-06-01",
    "Description": "Creates a cloud assistant command and triggers it on one ECS instance.",
    "Parameters": {
        "instanceId": {
            "Description": "The ID of ECS instance that will invoke command.",
            "Type": "String",
            "AllowedPattern": "i-[A-Za-z0-9]*",
            "MinLength": 1,
            "MaxLength": 30
        },
        "regionId": {
            "Type": "String"
        },
        "OOSAssumeRole": {
            "Description": "The RAM role to be assumed by OOS.",
            "Type": "String",
            "Default": "OOSServiceRole"
        }
    },
    "RamRole": "{{ OOSAssumeRole }}",
    "Tasks": [
        {
            "Name": "createCommand",
            "Action": "ACS::ExecuteAPI",
            "Description": "Creates a cloud assistant command.",
            "Properties": {
                "Service": "ECS",
                "API": "CreateCommand",
                "Parameters": {
                    "CommandContent": {
                        "Fn::Base64Encode": {
                            "Fn::Join": [
                                "\n",
                                [
                                    "echo hello world",
                                    "echo hello world",
                                    "",
                                    "echo \\$hello,this is aliyun",
                                    "echo $hello,this is aliyun",
                                    "",
                                    "if [[ \"a\" == \"a\" ]]; then",
                                    "  echo hello",
                                    "else",
                                    "  echo word",
                                    "fi",
                                    "",
                                    "echo 'hi judy'"
                                ]
                            ]
                        }
                    },
                    "RegionId": "{{ regionId }}",
                    "Name": "{{ ACS::ExecutionId }}",
                    "Type": "RunShellScript",
                    "WorkingDir": "/root",
                    "Timeout": 30
                }
            },
            "Outputs": {
                "CommandId": {
                    "Type": "String",
                    "ValueSelector": "CommandId"
                }
            }
        },
        {
            "Name": "invokeCommand",
            "Action": "ACS::ExecuteAPI",
            "Description": "Triggers a cloud assistant command on one ECS instances.",
            "Properties": {
                "Service": "ECS",
                "API": "InvokeCommand",
                "Parameters": {
                    "CommandId": "{{ createCommand.CommandId }}",
                    "InstanceIds": [
                        "{{ instanceId }}"
                    ],
                    "RegionId": "{{regionId}}"
                }
            },
            "Outputs": {
                "InvokeId": {
                    "Type": "String",
                    "ValueSelector": "InvokeId"
                }
            }
        },
        {
            "Name": "untilInvocationReady",
            "Action": "ACS::WaitFor",
            "Description": "Waits for the command to be completed.",
            "Delay": 20,
            "Retries": 30,
            "DelayType": "Constant",
            "Properties": {
                "Service": "ECS",
                "API": "DescribeInvocations",
                "Parameters": {
                    "RegionId": "{{regionId}}",
                    "InvokeId": "{{ invokeCommand.InvokeId }}"
                },
                "DesiredValues": [
                    "Finished"
                ],
                "StopRetryValues": [
                    "Failed"
                ],
                "PropertySelector": "Invocations.Invocation[].InvokeStatus"
            },
            "OnError": "deleteCommand"
        },
        {
            "Name": "describeInvocationResults",
            "Action": "ACS::ExecuteAPI",
            "Description": "Views the command output of a cloud assistant command in the specified ECS instance.",
            "Properties": {
                "Service": "ECS",
                "API": "DescribeInvocationResults",
                "Parameters": {
                    "RegionId": "{{regionId}}",
                    "InvokeId": "{{ invokeCommand.InvokeId }}"
                }
            },
            "Outputs": {
                "InvocationResult": {
                    "Type": "String",
                    "ValueSelector": "Invocation.InvocationResults.InvocationResult[].Output"
                }
            }
        },
        {
            "Name": "checkInvocationResult",
            "Action": "ACS::CheckFor",
            "Description": "Views the command output of a cloud assistant command in the specified ECS instance.",
            "Properties": {
                "Service": "ECS",
                "API": "DescribeInvocationResults",
                "Parameters": {
                    "RegionId": "{{regionId}}",
                    "InvokeId": "{{ invokeCommand.InvokeId }}"
                },
                "PropertySelector": "Invocation.InvocationResults.InvocationResult[].ExitCode",
                "DesiredValues": [
                    0
                ]
            }
        },
        {
            "Name": "deleteCommand",
            "Action": "ACS::ExecuteAPI",
            "Description": "Deletes a cloud assistant command.",
            "Properties": {
                "Service": "ECS",
                "API": "DeleteCommand",
                "Parameters": {
                    "RegionId": "{{ regionId}}",
                    "CommandId": "{{ createCommand.CommandId }}"
                }
            }
        }
    ],
    "Outputs": {
        "InvocationOutput": {
            "Type": "String",
            "Value": {
                "Fn::Base64Decode": "{{ describeInvocationResults.InvocationResult }}"
            }
        }
    }
}

四、校验模版,并格式化模版
脚本转化完的模版格式如下所示,转化的脚本,如果格式没有对齐,点击鼠标右键,选择Format Doucument,来使模版格式化。注意:需要手动删除脚本最后一句的逗号。
1567762425180_16cf9583_91f8_42d1_ad15_1e07f53785d3

五、创建执行
找到创建好的模版,点击创建执行
1567762987071_283a5bbd_f713_4bba_a813_c87cd04c7ed8

六、点击创建执行
1567077112647_d89f9f3c_fc42_4346_981a_f7afe1c94b41

模版开始正式执行,在输入的实例上执行想要运行的shell命令。

总结

由以上举例可见,此脚本的作用为手动操作节省了时间,并把在模版中解决了特殊字符转译的问题。此脚本还有很多不完善的地方,欢迎提出意见。

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