TeamCity ~ 通过构建步骤在服务器上启动 Docker

Question

我正在尝试创建用于创建 Docker 映像的 TeamCity 构建配置。

为了冗余，我希望第一个构建步骤检查 Docker 是否在 TeamCity 服务器上运行，并在必要时启动它。

我已经创建了以下 PowerShell 脚本来执行此操作。该脚本甚至会等到 Docker 完全正常运行后再完成。

# This File checks if docker is running, and starts it if necessary, waiting until it has finished starting up before exiting

# ---------
# VARIABLES
# ---------

$TimeoutInterval = 10 #Timeout interval for checking whether docker has finished starting, in seconds
$DockerPath = "C:\Program Files\Docker\Docker\Docker for Windows.exe"


# ---------
# FUNCTIONS
# ---------

Function ProcessRunning([string] $ProcessName) {
    [bool] $Return = $False
    if ( Get-Process | Where-Object {$_.Name -like $ProcessName} ) {
        $Return = $True
    }
    Return $Return
}


# -------
# PROGRAM
# -------

# Enables Error  Action Preference to stop to enable try-catches
$ErrorActionPreference = 'Stop'

if(ProcessRunning("Docker for Windows")){
    echo "Docker is running"
    echo ""
    docker version
}else{
    echo "Docker is not running"
    echo ""
    echo "Starting Docker"
    echo ""
    Start-Process $DockerPath

    #Waits while Docker has not finished starting up
    $dockerStarting = $true
    while($dockerStarting){
        try{
            docker version
            $dockerStarting = $false
        }catch{
            echo ""
            echo "Docker is still starting up..."
            echo ""
            $dockerStarting = $true
            Wait-Event -Timeout $TimeoutInterval
        }
    }
    echo ""
    echo "Docker has finished starting up!"
    echo ""
}

此脚本在 TeamCity 服务器上本地执行时可以正常工作。但是，当我尝试将其作为 BuildStep 运行时，它似乎忽略了 try-catch 块，就像在我设置 $ErrorActionPreference = 'Stop'

之前在我的本地版本中所做的那样

具体来说，docker version 命令失败，因为我希望它表明 Docker 尚未完全运行。但是，try-catch 块无法像在服务器上本地运行时那样捕获它。

我已经尝试了Format stderr output as: 和Script execution mode: 的两个值，但结果仍然相同：脚本抛出错误，并且没有在 TeamCity 服务器上启动 Docker。

现在，我的基本问题是：我正在尝试的东西在技术上是否可行？因为我可以想象 TeamCity 采用某种保护机制来防止运行它的服务器上的某些更改。再说一次，我过去曾成功地使用 PowerShell 脚本来复制和删除服务器上的文件，所以老实说，在这一点上，我对为什么这似乎不起作用感到更加困惑。

对此的任何意见将不胜感激。

Answer 1

好的，所以我尝试了很多，最终找到了一个解决方案，让我可以通过 TeamCity 构建步骤检查 Docker 是否正在运行，如果没有，则成功启动它。

这实际上是一个两层问题，必须完成两件不同的事情才能使其发挥作用：

1.) 作为提升的本地帐户运行 TeamCity 构建代理服务

就我而言，我在 SYSTEM 帐户下运行了 TeamCity 构建代理服务。我使用以下方法将其切换为管理员帐户：

Services
↳TeamCity Build Agent
 ↳Log On>Log on as
  ↳◉This account: .\Administrator

2.) 使用不依赖 try-catch 的“干净”脚本来查看 Docker 是否正在运行

我现在使用的最终的 PowerShell 脚本如下所示：

# This File checks if docker is running, and starts it if necessary, waiting until it has finished starting up before exiting

# ---------
# VARIABLES
# ---------

$TimeoutInterval = 10 #Timeout interval for checking whether docker has finished starting, in seconds
$DockerPath = "C:\Program Files\Docker\Docker\Docker for Windows.exe"


# ---------
# FUNCTIONS
# ---------

Function ProcessRunning([string] $ProcessName) {
    [bool] $Return = $False
    if ( Get-Process | Where-Object {$_.Name -like $ProcessName} ) {
        $Return = $True
    }
    Return $Return
}

# Determines if a Service exists with a name as defined in $ServiceName.
Function ServiceExists([string] $ServiceName) {
    [bool] $Return = $False
    if ( Get-Service "$ServiceName*" -Include $ServiceName ) {
        $Return = $True
    }
    Return $Return
}

# Determines if a Service with a name as defined in $ServiceName exists and is running
Function ServiceRunning([string] $ServiceName) {
    [bool] $Return = $False
    Write-Host "Checking if Service "$ServiceName" exists and is running"
    Write-Host ""
    if ( Get-Service "$ServiceName*" -Include $ServiceName ) {

        $arrService = Get-Service -Include $ServiceName

        if ( $arrService.Status -eq "Running" ) {
            Write-Host "Service "$ServiceName" exists, and is running!"
            Write-Host ""
            $Return = $True
        }else{
            Write-Host "Service "$ServiceName" exists, but is not running!"
            Write-Host ""
        }
    }else{
        Write-Host "Service "$ServiceName" does not exist!"
        Write-Host ""
    }
    Return $Return
}


# -------
# PROGRAM
# -------

if(ProcessRunning("Docker for Windows")){
    Write-Host "Docker is running"
    Write-Host ""
    docker version
}else{
    Write-Host "Docker is not running"
    Write-Host ""
    Write-Host "Starting Docker"
    Write-Host ""
    Start-Process $DockerPath

    #Waits while Docker has not finished starting up
    $dockerStarting = $true
    while($dockerStarting){
        if((ServiceRunning("com.docker.service")) -and (ServiceRunning("docker"))){
            Write-Host ""
            Write-Host "Docker has finished starting up!"
            Write-Host ""
            docker version
            $dockerStarting = $false
        }else{
            Write-Host ""
            Write-Host "Docker is still starting up..."
            Write-Host ""

            #Attempts to start the relevant services
            if(!(ServiceRunning("com.docker.service"))){
                if(ServiceExists("com.docker.service")){
                    Start-Service "com.docker.service"
                }
            }
            if(!(ServiceRunning("docker"))){
                if(ServiceExists("docker")){
                    Start-Service "docker"
                }
            }

            $dockerStarting = $true
            Wait-Event -Timeout $TimeoutInterval
        }
    }
}

我仍然不知道为什么 try-catch 在 TeamCity 中不起作用，所以如果有人知道答案，请发表评论。

无论如何，我希望这个解决方案对某人有所帮助。