warning: %postun(WALinuxAgent-2.0.16-2.noarch) scriptlet failed, signal 15

I’m provisioning a CentOs box 7.x from the Azure images in the portal. On startup I wan to update yum packages + install Tomcat ( this is POC for customer ).

I’m using CustomScriptExtension to download and run this script containing:

#!/bin/bash          
# some stuff

# Taken from: https://github.com/Azure/azure-quickstart-templates/blob/875d139c16c9c023dce519e6dd48c707e3473346/torque-cluster/azuredeploy.sh
sed -i "s/Defaults\s\{1,\}requiretty/Defaults \!requiretty/g" /etc/sudoers
sudo -u serveradmin sh -c "mkdir /home/serveradmin/.ssh/;echo Host worker\* > /home/serveradmin/.ssh/config; echo StrictHostKeyChecking no >> /home/serveradmin/.ssh/config; echo UserKnownHostsFile=/dev/null >> /home/serveradmin/.ssh/config"
if ! [ -f /home/serveradmin/.ssh/id_rsa ]; then
    sudo -u serveradmin sh -c "ssh-keygen -f /home/serveradmin/.ssh/id_rsa -t rsa -N ''"
fi

sudo yum update -y > update_log.txt
sudo yum install tomcat -y > instal_log.txt

However - this fails always and we found the following in the execution in the .errout of the script execution:

Non-fatal POSTUN scriptlet failure in rpm package WALinuxAgent-2.0.16-2.noarch

File location: /var/lib/waagent/Microsoft.OSTCExtensions.CustomScriptForLinux-1.4.1.0/download/0/stderr

Checking the update_log.txt file shows the context of this error:

Loaded plugins: fastestmirror, langpacks
Determining fastest mirrors
Resolving Dependencies
--> Running transaction check
---> Package ModemManager-glib.x86_64 0:1.1.0-6.git20130913.el7 will be updated
---> Package ModemManager-glib.x86_64 0:1.1.0-8.git20130913.el7 will be an update
...
...
...
  Updating   : 1:iwl1000-firmware-39.31.5.1-43.el7.noarch               329/639 
  Updating   : iwl5150-firmware-8.24.2.2-43.el7.noarch                  330/639 
  Updating   : iwl135-firmware-18.168.6.1-43.el7.noarch                 331/639 
  Updating   : iwl3160-firmware-22.0.7.0-43.el7.noarch                  332/639 
  Updating   : iwl7260-firmware-22.0.7.0-43.el7.noarch                  333/639 
  Cleanup    : WALinuxAgent-2.0.16-2.noarch                             334/639 
warning: %postun(WALinuxAgent-2.0.16-2.noarch) scriptlet failed, signal 15

The yum updates work but stop as soon as this error occurs. Can you guys point me to a solution?

[grandparoach]

For what it’s worth, I just experienced the exact same error. I’m using the RHEL 7.2 image. When I run the script with the “yum - y update” command manually, everything runs just fine with no errors. But when it runs as the CustomScriptForLinux OSTCExtension from an ARM Template, it always hangs with the exact error message above. I’m trying the “–exclude” work around mentioned above right now, but I thought someone would like to know that it is still a problem.

[pgombar]

@deathcat05 the agent has an auto-update functionality. Your snippet from /var/log/messages shows that the agent already self-discovered an update (2.2.42) being the latest available version and updated itself, so there is no need to update it from an extension.

There are two agent handlers running on any VM, extension handler and daemon. More info on that here: https://github.com/Azure/WALinuxAgent/wiki/FAQ

When issuing yum upgrade, it updates the daemon (provision handler). However, as I said, if your goal is just to have a running up-to-date agent (extension handler), there is no need to do it manually as there’s an auto-update functionality.