Packer node reboot is failing

[Rajendra Kumar]

Hi,

While baking for GCP image, in my config.json I have a script which checks if the current kernel version is not the same as latest kernel version.

if the kernel version is old then I do a reboot of my packer node. below is the code for the reboot.

latest_version=`rpm -qa kernel | sort -V| tail -1`
latest_version=`echo $latest_version | sed 's/\(kernel-*\)/''/g'`
current_version=`uname -r`
if [[ $latest_version != $current_version ]]; then
  DO_REBOOT=1
fi

if [ "$DO_REBOOT" -eq 1 ]; then
  /sbin/reboot
fi

But the packer is failing with the below error, not able to figure out what is the issue here, Any idea what might be the issue here ?

1575604931,,ui,message,    gcp: Complete!
1575604932,,ui,say,==> gcp: Provisioning with shell script: ../../commonscripts/check_reboot.sh
1575604932,,ui,error,==> gcp: + DO_REBOOT=0
1575604932,,ui,error,==> gcp: + yum -y erase /opt/nvidia/cuda/bin/nvcc
1575604932,,ui,message,    gcp: Loaded plugins: fastestmirror
1575604932,,ui,error,==> gcp: No Match for argument: /opt/nvidia/cuda/bin/nvcc
1575604932,,ui,message,    gcp: No Packages marked for removal
1575604932,,ui,error,==> gcp: + [[ '' == Standard_NC* ]]
1575604932,,ui,error,==> gcp: + [[ '' == g2.* ]]
1575604932,,ui,error,==> gcp: ++ rpm -qa kernel
1575604932,,ui,error,==> gcp: ++ sort -V
1575604932,,ui,error,==> gcp: ++ tail -1
1575604932,,ui,error,==> gcp: + latest_version=kernel-3.10.0-862.el7.x86_64
1575604932,,ui,error,==> gcp: ++ echo kernel-3.10.0-862.el7.x86_64
1575604932,,ui,error,==> gcp: ++ sed 's/\(kernel-*\)//g'
1575604932,,ui,error,==> gcp: + latest_version=3.10.0-862.el7.x86_64
1575604932,,ui,error,==> gcp: ++ uname -r
1575604932,,ui,error,==> gcp: + current_version=3.10.0-862.14.4.el7.x86_64
1575604932,,ui,error,==> gcp: + [[ 3.10.0-862.el7.x86_64 != 3.10.0-862.14.4.el7.x86_64 ]]
1575604932,,ui,error,==> gcp: + DO_REBOOT=1
1575604932,,ui,error,==> gcp: + '[' 1 -eq 1 ']'
1575604932,,ui,error,==> gcp: + /sbin/reboot
1575604933,,ui,say,==> gcp: Provisioning step had errors: Running the cleanup provisioner%!(PACKER_COMMA) if present...
1575604933,,ui,say,==> gcp: Deleting instance...
1575605107,,ui,message,    gcp: Instance has been deleted!
1575605107,,ui,say,==> gcp: Deleting disk...
1575605110,,ui,message,    gcp: Disk has been deleted!
1575605110,,ui,error,Build 'gcp' errored: Script disconnected unexpectedly. If you expected your script to disconnect%!(PACKER_COMMA) i.e. from a restart%!(PACKER_COMMA) you can try adding `"expect_disconnect": true` or `"valid_exit_codes": [0%!(PACKER_COMMA) 2300218]` to the shell provisioner parameters.
1575605110,,error-count,1
1575605110,,ui,error,\n==> Some builds didn't complete successfully and had errors:
1575605110,gcp,error,Script disconnected unexpectedly. If you expected your script to disconnect%!(PACKER_COMMA) i.e. from a restart%!(PACKER_COMMA) you can try adding `"expect_disconnect": true` or `"valid_exit_codes": [0%!(PACKER_COMMA) 2300218]` to the shell provisioner parameters.
1575605110,,ui,error,--> gcp: Script disconnected unexpectedly. If you expected your script to disconnect%!(PACKER_COMMA) i.e. from a restart%!(PACKER_COMMA) you can try adding `"expect_disconnect": true` or `"valid_exit_codes": [0%!(PACKER_COMMA) 2300218]` to the shell provisioner parameters.
1575605110,,ui,say,\n==> Builds finished but no artifacts were created.

[Rickard von Essen]

As the error message says, if you expect the script to disconnect the ssh connection you need to add expect_disconnect": true. But a question, do you need to reboot? When an instance is launched from the image it will boot the latest (installed) kernel?

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