軟體主廚的程式料理廚房

相對於 Shell Script 在語法上將標點符號發揮得淋漓盡致，我個人覺得 PowerShell 顯得平易近人許多，我個人在學習 Shell Script 時有一道檻，那就是有很多的標點符號組合要強記，而 PowerShell 的標點符號就用得沒那麼多，還有就是 PowerShell 的語法比較貼近平常在用的程式語言，熟悉感比較強烈。

下載安裝 PowerShell

廢話不多說，馬上就在 CentOS 7 執行下面的指令將 PowerShell 裝起來，我安裝的版本是 6.2.4。

sudo yum install -y https://github.com/PowerShell/PowerShell/releases/download/v6.2.4/powershell-6.2.4-1.rhel.7.x86_64.rpm

安裝完成後，執行 pwsh 就會進入 PowerShell 的操作介面，就表示安裝成功。

相關步驟的說明請參考我上一篇的文章，底下我僅貼上相對應的 PowerShell 指令碼。

Who is Production? Who is Stage?

$conf = (Get-Content /etc/nginx/conf.d/www.conf | Out-String)

$conf -match "localhost:(\d+)" | Out-Null

if ( $Matches.1 -eq "8001" ) {
    $prod = "WebApp-8001"
    $stage = "WebApp-8002"
} else {
    $prod = "WebApp-8002"
    $stage = "WebApp-8001"
}

Stop Stage service

if ( (systemctl is-active $stage | Out-String).Trim() -eq "active" ) {
    sudo systemctl stop $stage
}

Pull from deployment repository

Set-Location -Path "/home/User/test-deploy"

$prev_sha = (git rev-parse HEAD | Out-String)

git pull --quiet

$diff_log = (git diff --stat=1000,1000 $prev_sha | Out-String)

if ( -NOT ($diff_log -match "[1-9][0-9]*\sfiles?\schanged")) {
    exit 0
}

Mirror copy deployment files to Stage folder

rsync -rtD --force --delete --ignore-errors /home/User/test-deploy/WebApp/ /var/www/$stage/

Start Stage service

sudo systemctl start $stage

Modify and reload Nginx's conf

$prod -match "[^-]+-(\d+)" | Out-Null

$prod_authority = "localhost:$($Matches.1)"

$stage -match "[^-]+-(\d+)" | Out-Null

$stage_authority = "localhost:$($Matches.1)"

sudo sed -i "s/$prod_authority/$stage_authority/g" /etc/nginx/conf.d/www.conf

sudo nginx -s reload

Stop Production service

Start-Sleep -Seconds 30
sudo systemctl stop $prod

完整指令碼

$conf = (Get-Content /etc/nginx/conf.d/www.conf | Out-String)

$conf -match "localhost:(\d+)" | Out-Null

if ( $Matches.1 -eq "8001" ) {
    $prod = "WebApp-8001"
    $stage = "WebApp-8002"
} else {
    $prod = "WebApp-8002"
    $stage = "WebApp-8001"
}

if ( (systemctl is-active $stage | Out-String).Trim() -eq "active" ) {
    sudo systemctl stop $stage
}

Set-Location -Path "/home/User/test-deploy"

$prev_sha = (git rev-parse HEAD | Out-String)

git pull --quiet

$diff_log = (git diff --stat=1000,1000 $prev_sha | Out-String)

if ( -NOT ($diff_log -match "[1-9][0-9]*\sfiles?\schanged")) {
    exit 0
}

rsync -rtD --force --delete --ignore-errors /home/User/test-deploy/WebApp/ /var/www/$stage/

sudo systemctl start $stage
Start-Sleep -Seconds 10

$prod -match "[^-]+-(\d+)" | Out-Null

$prod_authority = "localhost:$($Matches.1)"

$stage -match "[^-]+-(\d+)" | Out-Null

$stage_authority = "localhost:$($Matches.1)"

sudo sed -i "s/$prod_authority/$stage_authority/g" /etc/nginx/conf.d/www.conf

sudo nginx -s reload

Start-Sleep -Seconds 30
sudo systemctl stop $prod

參考資料

• 在 CentOS 7 上安裝 PowerShell Core

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