Lars Benedetto created FELIX-6229:
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Summary: Not compatible with the symlinks Kubernetes uses to mount
ConfigMaps
Key: FELIX-6229
URL: https://issues.apache.org/jira/browse/FELIX-6229
Project: Felix
Issue Type: Bug
Components: File Install
Affects Versions: fileinstall-3.6.4
Environment: linux
Reporter: Lars Benedetto
I am trying to deploy xml blueprint files in Karaf by using Kubernetes to mount
a ConfigMap as a file inside Karafs deploy folder. Unfortunately, K8s doesn't
just put the file in the deploy folder.
root@/apache-karaf/deploy# ls -al
total 0
drwxrwxrwx 3 root root 151 Feb 26 04:20 .
drwxr-xr-x 1 root root 64 Feb 25 05:49 ..
drwxr-xr-x 2 root root 98 Feb 26 04:20 ..2020_02_26_04_20_14.044787912
lrwxrwxrwx 1 root root 31 Feb 26 04:20 ..data ->
..2020_02_26_04_20_14.044787912
lrwxrwxrwx 1 root root 45 Feb 26 04:13 route.xml -> ..data/route.xml
K8s creates a chain of symlinks. This works at first, because Felix detects the
creation of the symlink from route.xml -> data/route.xml, and follow the
symlinks through to get to the actual file.
But when K8s comes in to update with a new version of the route, it creates a
new timestamped directory, and then updates the intermediate symlink from data
-> timestamp.
Felix detects this as well, but only partially. It deploys the new timestamp
dir with {{wrap:jardir:}} and the new symlink to the timestamp dir as
{{wrap:jardir:}} as well. But it does not reload the route.
Steps to reproduce:
In this variant, intermediate and final are detected and deployed as
{{wrap:jardir: }}and the route is detected and deployed correctly, but
subsequent changes to the route are not.
{code:java}
mkdir final1
cp /routev1.xml /apache-karaf/deploy/final1/route.xml
ln -s final1 intermediate
ln -s intermediate/route.xml route.xml
# And then to mimic k8s switching to the new file
mkdir final2
cp /routev2.xml /apache-karaf/deploy/final2/route.xml
rm intermediate
ln -s final2 intermediate
{code}
In this variant, the route is never detected. But intermediate and final are
both detected and deployed as {{wrap:jardir:}}
{code:java}
mkdir final1
cp /routev1.xml /apache-karaf/deploy/final1/route.xml
ln -s intermediate/route.xml route.xml
ln -s final1 intermediate{code}
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