BUG12445: Fix for Hyper-V stuck 8 minutes at boot

Message ID 20210331224236.12971-1-admin@cekal.org
State Superseded
Headers show
Series BUG12445: Fix for Hyper-V stuck 8 minutes at boot | expand

Commit Message

Thomas Cekal March 31, 2021, 10:42 p.m. UTC
Fix for Bug 12445: There is no proper way to distinguish between MS Azure and a local
Hyper-V installation Procedure: try to get the metadata info from the
internal MS metadata service at IP 169.254.169.254 If this fails the system
is running on an local Hyper-V instance wget takes too long to exit if the IP
is not reachable Added --timeout and --tries param to wget to reduce the
duation from 8 minutes to 10 seconds 10 seconds at one try should be enough
Signed-off-by: Thomas Cekal <admin@cekal.org>

---
 src/initscripts/helper/azure-setup | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Michael Tremer April 1, 2021, 9:32 a.m. UTC | #1
Hello Thomas,

And thank you for submitting this patch.

We have had a couple of bug reports about this before and I think I had proposed a similar solution which was never confirmed to work by the person who reported the bug.

I agree that this is a bug, but do we not want to set the tries to something higher than 1? Just in case the network isn’t fully up yet?

I would say that we can decrease the timeout because the service is usually running on the same host and either responds immediately (less than a couple of milliseconds) or not at all. So 3 seconds and three tries is something that would give you the same timeout but hopefully has a better chance to get a response if the network isn’t up, yet.

Does that sound good to you?

-Michael

> On 31 Mar 2021, at 23:42, Thomas Cekal <admin@cekal.org> wrote:
> 
> Fix for Bug 12445: There is no proper way to distinguish between MS Azure and a local
> Hyper-V installation Procedure: try to get the metadata info from the
> internal MS metadata service at IP 169.254.169.254 If this fails the system
> is running on an local Hyper-V instance wget takes too long to exit if the IP
> is not reachable Added --timeout and --tries param to wget to reduce the
> duation from 8 minutes to 10 seconds 10 seconds at one try should be enough
> Signed-off-by: Thomas Cekal <admin@cekal.org>
> 
> ---
> src/initscripts/helper/azure-setup | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/initscripts/helper/azure-setup b/src/initscripts/helper/azure-setup
> index 5157712fc..a0d547588 100644
> --- a/src/initscripts/helper/azure-setup
> +++ b/src/initscripts/helper/azure-setup
> @@ -9,7 +9,7 @@ export PATH=/usr/local/sbin:/usr/local/bin:${PATH}
> get() {
> 	local file="${1}"
> 
> -	wget -qO - --header="Metadata:true" "http://169.254.169.254/metadata/instance/${file}?api-version=2019-06-01&format=text"
> +	wget --timeout=10 --tries=1 -qO - --header="Metadata:true" "http://169.254.169.254/metadata/instance/${file}?api-version=2019-06-01&format=text"
> }
> 
> format_mac() {
> -- 
> 2.17.1
>

Patch

diff --git a/src/initscripts/helper/azure-setup b/src/initscripts/helper/azure-setup
index 5157712fc..a0d547588 100644
--- a/src/initscripts/helper/azure-setup
+++ b/src/initscripts/helper/azure-setup
@@ -9,7 +9,7 @@  export PATH=/usr/local/sbin:/usr/local/bin:${PATH}
 get() {
 	local file="${1}"
 
-	wget -qO - --header="Metadata:true" "http://169.254.169.254/metadata/instance/${file}?api-version=2019-06-01&format=text"
+	wget --timeout=10 --tries=1 -qO - --header="Metadata:true" "http://169.254.169.254/metadata/instance/${file}?api-version=2019-06-01&format=text"
 }
 
 format_mac() {