I recently wrote a blog post about installing Splunk on Azure Web/Worker roles with the help of a startup task. You can see that blog post here. In this blog post I will show you how to install Java runtime in web/worker roles. Azure Web/Worker roles are stateless so the only way to install third party software or tweak windows features on web/worker roles is via startup tasks.
Linux users have had the benefit of tools like apt, yum etc to download and install software via command line. Chocolatey provides you with similar functionality on Windows Platform. If you into DevOps and automation on Windows platform you should check out Chocolatey here. It has nearly 15000 packages already available.
Once you have Chocolatey installed installing java is a breeze. It is as simple as
choco install javaruntime -y
The statement above is self explanatory. Option –y answers y to all the questions including accepting the license so you are not prompted to answer any questions.
I already provided detailed steps to define startup tasks in my previous blog post. So I will just share the startup script along with the service definition file that shows how to deploy Java runtime in Azure web/worker role with a startup task.
Step 1
Create a startup.cmd file and add it to your worker/web role implementation. It should be saved as “Unicode (UTF-8 without signature) – Codepage 65001”.
Set the “copy to output directory” property of startup.cmd to “copy if newer”
Line 9 checks to see if the startup task ran successfully and end if it did
Line 16 installs chocolatey
Line 22 install java run time
Line 26 only execute if java was installed successfully and it creates startupcomplete.txt file in approot directory.
1: SET LogPath=%LogFileDirectory%%LogFileName%
2:
3: ECHO Current Role: %RoleName% >> "%LogPath%" 2>&1
4: ECHO Current Role Instance: %InstanceId% >> "%LogPath%" 2>&1
5: ECHO Current Directory: %CD% >> "%LogPath%" 2>&1
6:
7: ECHO We will first verify if startup has been executed before by checking %RoleRoot%\StartupComplete.txt. >> "%LogPath%" 2>&1
8:
9: IF EXIST "%RoleRoot%\StartupComplete.txt" (
10: ECHO Startup has already run, skipping. >> "%LogPath%" 2>&1
11: EXIT /B 0
12: )
13:
14: Echo Installing Chocolatey >> "%LogPath%" 2>&1
15:
16: @powershell -NoProfile -ExecutionPolicy Bypass -Command "iex ((new-object net.webclient).DownloadString('https://chocolatey.org/install.ps1'))" && SET PATH=%PATH%;%ALLUSERSPROFILE%\chocolatey\bin >> "%LogPath%" 2>&1
17:
18: IF ERRORLEVEL EQU 0 (
19:
20: Echo Installing Java runtime >> "%LogPath%" 2>&1
21:
22: %ALLUSERSPROFILE%\chocolatey\bin\choco install javaruntime -y >> "%LogPath%" 2>&1
23:
24: IF ERRORLEVEL EQU 0 (
25: ECHO Java installed. Startup completed. >> "%LogPath%" 2>&1
26: ECHO Startup completed. >> "%RoleRoot%\StartupComplete.txt" 2>&1
27: EXIT /B 0
28: ) ELSE (
29: ECHO An error occurred. The ERRORLEVEL = %ERRORLEVEL%. >> "%LogPath%" 2>&1
30: EXIT %ERRORLEVEL%
31: )
32: ) ELSE (
33: ECHO An error occurred while install chocolatey The ERRORLEVEL = %ERRORLEVEL%. >> "%LogPath%" 2>&1
34: EXIT %ERRORLEVEL%
35: )
36:
Step 2
Update the service definition file to define the startup task.
Lines 5 through 19 define the statup task.
1: <?xml version="1.0" encoding="utf-8"?>
2: <ServiceDefinition name="AzureJavaPaaS" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition" schemaVersion="2015-04.2.6">
3: <WorkerRole name="MyWorkerRole" vmsize="Small">
4: <Startup>
5: <Task commandLine="Startup.cmd" executionContext="elevated" taskType="simple">
6: <Environment>
7: <Variable name="LogFileName" value="Startup.log" />
8: <Variable name="LogFileDirectory">
9: <RoleInstanceValue xpath="/RoleEnvironment/CurrentInstance/LocalResources/LocalResource[@name='LogsPath']/@path" />
10: </Variable>
11: <Variable name="InstanceId">
12: <RoleInstanceValue xpath="/RoleEnvironment/CurrentInstance/@id" />
13: </Variable>
14: <Variable name="RoleName">
15: <RoleInstanceValue xpath="/RoleEnvironment/CurrentInstance/@roleName" />
16: </Variable>
17: </Environment>
18: </Task>
19: </Startup>
20: <ConfigurationSettings>
21: <Setting name="Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString" />
22: </ConfigurationSettings>
23: <LocalResources>
24: <LocalStorage name="LogsPath" cleanOnRoleRecycle="false" sizeInMB="1024" />
25: </LocalResources>
26: <Imports>
27: <Import moduleName="RemoteAccess" />
28: <Import moduleName="RemoteForwarder" />
29: </Imports>
30: </WorkerRole>
31: </ServiceDefinition>
Step 3
Publish the cloud service to Azure. I enabled remote desktop to be able to verify if the worker role was configured successfully.
Verification
I used Remote Desktop to log into the worker role. I looked in
C:\Resources\Directory\d063631e14c1485cb6c838c8f92cd7c3.MyWorkerRole.LogsPath and found startup.txt
It had the following content. As you can see below that java was installed successfully.
1: Current Role: MyWorkerRole
2: Current Role Instance: MyWorkerRole_IN_0
3: Current Directory: E:\approot
4: We will first verify if startup has been executed before by checking E:\StartupComplete.txt.
5: Installing Chocolatey
6: Installing Java runtime
7: Chocolatey v0.9.9.8
8: Installing the following packages:
9: javaruntime
10: By installing you accept licenses for the packages.
11:
12: jre8 v8.0.45
13: Downloading jre8 32 bit
14: from 'http://javadl.sun.com/webapps/download/AutoDL?BundleId=106246'
15: Installing jre8...
16: jre8 has been installed.
17: Downloading jre8 64 bit
18: from 'http://javadl.sun.com/webapps/download/AutoDL?BundleId=106248'
19: Installing jre8...
20: jre8 has been installed.
21: PATH environment variable does not have D:\Program Files\Java\jre1.8.0_45\bin in it. Adding...
22: The install of jre8 was successful.
23:
24: javaruntime v8.0.40
25: The install of javaruntime was successful.
26:
27: Chocolatey installed 2/2 package(s). 0 package(s) failed.
28: See the log for details (D:\ProgramData\chocolatey\logs\chocolatey.log).
29: Java installed. Startup completed.
30:
I also verified that e:\startupcomplete.txt file was created.
I verified that java was installed in D:\Sun\Java directory
You can get the source code for this entire project from my GitHub Repository https://github.com/rajinders/azure-java-paas.
The post Installing Java Runtime in Azure Cloud Services with Chocolatey appeared first on Raj's Cloud Musings.
