Post deployment bash script in Bicep file does not execute - Ubuntu

fabioklr
November 17, 2022
190 views
0 votes
2 Answers

I want to deploy an Ubuntu VM on Azure and automatically execute a few lines of Bash code right after the VM is deployed. The Bash code is supposed to install PowerShell on the VM. To do this, I use this Bicep file. Below you can see an extract of that Bicep file where I specify what Bash code I want to be executed post deployment.

resource deploymentscript 'Microsoft.Compute/virtualMachines/runCommands@2022-08-01' = {
  parent: virtualMachine
  name: 'postDeploymentPSInstall'
  location: location
  properties: {
    source: {
      script: '''sudo apt-get update &&
      sudo apt-get install -y wget apt-transport-https software-properties-common &&
      wget -q "https://packages.microsoft.com/config/ubuntu/$(lsb_release -rs)/packages-microsoft-prod.deb" &&
      sudo dpkg -i packages-microsoft-prod.deb &&
      sudo apt-get update &&
      sudo apt-get install -y powershell &&
      pwsh'''
    }
  }
}

I searched for solutions on the web but only found conflicting explanations. I made the code above with the help of this tutorial. The only difference I see is that I’m using Bash and not PowerShell like the blog post author. Thanks for your help.

Answers

- EricMarceau
- November 21, 2022 at 3:52 am
- 0 votes
0
Your problem is misunderstanding what the && does.

The shell will attempt to run semi-simultaneously all parts, some possibly clobbering others or not having necessary preconditions in place before starting!

Replace all instances of "&&" with ";" and your script should work, meaning the commands will run sequentially, waiting for the previous line to complete before attempting the subsequent lines.

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To deploy an Ubuntu VM on Azure and automatically execute a few lines of Bash code right after the VM is deployed:

I tried to create a Linux VM and used run command to install PowerShell inside the VM while deployment and was able to achieve the desired results by running below bicep file.

@description('Name of the Network Security Group')
param  networkSecurityGroupName  string = 'SecGroupNet'
var  publicIPAddressName = '${vmName}PublicIP'
var  networkInterfaceName = '${vmName}NetInt'
var  osDiskType = 'Standard_LRS'
var  subnetAddressPrefix = '10.1.0.0/24'
var  addressPrefix = '10.1.0.0/16'
var  linuxConfiguration = {
disablePasswordAuthentication: true
ssh: {
publicKeys: [
 {
path: '/home/${adminUsername}/.ssh/authorized_keys'
keyData: adminPassword
 }
]
}
}
resource  nic 'Microsoft.Network/networkInterfaces@2021-05-01' = {
name: networkInterfaceName
location: location
properties: {
ipConfigurations: [
{
name: 'ipconfig1'
properties: {
subnet: {
id: subnet.id
}
privateIPAllocationMethod: 'Dynamic'
publicIPAddress: {
id: publicIP.id
}
}
}
]
networkSecurityGroup: {
id: nsg.id
}
}
}
resource  nsg  'Microsoft.Network/networkSecurityGroups@2021-05-01' = {
name: networkSecurityGroupName
location: location
properties: {
securityRules: [
{
 name: 'SSH'
 properties: {
 priority: 1000
 protocol: 'Tcp'
 access: 'Allow'
 direction: 'Inbound'
 sourceAddressPrefix: '*'
 sourcePortRange: '*'
 destinationAddressPrefix: '*'
 destinationPortRange: '22'
  }
 }
]
}
}
resource  vnet  'Microsoft.Network/virtualNetworks@2021-05-01' = {
name: virtualNetworkName
location: location
properties: {
addressSpace: {
addressPrefixes: [
addressPrefix
]
}
}
}
resource  subnet  'Microsoft.Network/virtualNetworks/subnets@2021-05-01' = {
parent: vnet
name: subnetName
properties: {
addressPrefix: subnetAddressPrefix
privateEndpointNetworkPolicies: 'Enabled'
privateLinkServiceNetworkPolicies: 'Enabled'
}
}
resource  publicIP  'Microsoft.Network/publicIPAddresses@2021-05-01' = {
name: publicIPAddressName
location: location
sku: {
name: 'Basic'
}
properties: {
publicIPAllocationMethod: 'Dynamic'
publicIPAddressVersion: 'IPv4'
dnsSettings: {
domainNameLabel: dnsLabelPrefix
}
idleTimeoutInMinutes: 4
}
}
resource  vm  'Microsoft.Compute/virtualMachines@2021-11-01' = {
name: vmName
location: location
properties: {
hardwareProfile: {
vmSize: vmSize
}
storageProfile: {
osDisk: {
createOption: 'FromImage'
managedDisk: {
storageAccountType: osDiskType
}
}
imageReference: {
publisher: 'Canonical'
offer: 'UbuntuServer'
sku: ubuntuOSVersion
version: 'latest'
}
}
networkProfile: {
networkInterfaces: [
{
id: nic.id
}
]
}
osProfile: {
computerName: vmName
adminUsername: adminUsername
adminPassword: adminPassword
linuxConfiguration: ((authenticationType == 'password') ? null : linuxConfiguration)
}
}
}
resource  deploymentscript  'Microsoft.Compute/virtualMachines/runCommands@2022-03-01' = {
parent: vm
name: 'linuxscript'
location: location
properties: {
source: {
script: '''# Update the list of packages
sudo apt-get update;
#Install pre-requisite packages.
sudo apt-get install -y wget apt-transport-https software-properties-common;
#Download the Microsoft repository GPG keys
wget -q "https://packages.microsoft.com/config/ubuntu/$(lsb_release -rs)/packages-microsoft-prod.deb";
#Register the Microsoft repository GPG keys
sudo dpkg -i packages-microsoft-prod.deb;
#Update the list of packages after we added packages.microsoft.com
sudo apt-get update;
#Install PowerShell
sudo apt-get install -y powershell;
#Start PowerShell
pwsh'''
}
}
}
output  adminUsername  string = adminUsername
output  hostname  string = publicIP.properties.dnsSettings.fqdn
output  sshCommand  string = 'ssh $ {adminUsername}@${publicIP.properties.dnsSettings.fqdn}'

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