[Flaky Test] pull-gardener-extension-shoot-rsyslog-relp-e2e-kind fails due to rsyslog not getting configured properly

[plkokanov]

How to categorize this issue?

/area testing
/kind flake

Which test(s)/suite(s) are flaking:
pull-gardener-extension-shoot-rsyslog-relp-e2e-kind

CI link:
https://prow.gardener.cloud/view/gs/gardener-prow/pr-logs/pull/gardener_gardener-extension-shoot-rsyslog-relp/193/pull-gardener-extension-shoot-rsyslog-relp-e2e-kind/1854625576917143552

Reason for failure:
Checking whether rsyslog is properly started and configured on the shoot's nodes failed with:

• [FAILED] [469.209 seconds]
Shoot Rsyslog Relp Extension Tests [It] Create Shoot with shoot-rsyslog-relp extension enabled and force delete Shoot [force-delete]
/home/prow/go/src/github.com/gardener/gardener-extension-shoot-rsyslog-relp/test/e2e/create_enable_force_delete.go:24
  ...
  ...
  ...
  [FAILED] Timed out after 60.001s.
  The function passed to Eventually failed at /home/prow/go/src/github.com/gardener/gardener-extension-shoot-rsyslog-relp/test/common/verifier.go:114 with:
  Expected the /etc/rsyslog.d/60-audit.conf file to exist and the rsyslog service to be active on node machine-shoot--local--e2e-rslog-fd-local-64477-sjbq7
  Expected
      <string>: not configured\n
  to equal
      <string>: configured\n
  In [It] at: /home/prow/go/src/github.com/gardener/gardener-extension-shoot-rsyslog-relp/test/e2e/create_enable_force_delete.go:50 @ 11/07/24 21:20:53.796

The tests check if the rsyslog service is properly configured by checking if the /etc/rsyslog.d/60-audit.conf file exists and the rsyslog service is started:

gardener-extension-shoot-rsyslog-relp/test/common/verifier.go

Lines 112 to 115 in b39d25b

	EventuallyWithOffset(2, func(g Gomega) {
	response, _ := ExecCommand(ctx, v.log, v.rootPodExecutor, "sh -c 'test -f /etc/rsyslog.d/60-audit.conf && systemctl is-active rsyslog.service' &>/dev/null && echo 'configured' || echo 'not configured'")
	g.Expect(string(response)).To(Equal("configured\n"), fmt.Sprintf("Expected the /etc/rsyslog.d/60-audit.conf file to exist and the rsyslog service to be active on node %s", v.nodeName))
	}).WithTimeout(1 * time.Minute).WithPolling(10 * time.Second).WithContext(ctx).Should(Succeed())

This file is created by a the configure-rsyslog.tpl.sh script only if the rsyslog service is installed on the node.

This installation of the rsyslog service is done by the following code:

gardener-extension-shoot-rsyslog-relp/test/e2e/create_enable_force_delete.go

Lines 38 to 41 in b39d25b

	By("Install rsyslog-relp unit on Shoot nodes")
	common.ForEachNode(ctx, f.ShootFramework.ShootClient, func(ctx context.Context, node *corev1.Node) {
	installRsyslogRelp(ctx, f.Logger, f.ShootFramework.ShootClient, node.Name)
	})

According to the node logs, rsyslog-relp was installed at 2024-11-07 21:19:42

Start-Date: 2024-11-07  21:19:42
Commandline: apt-get install -y rsyslog-relp
Install: libidn12:amd64 (1.41-1, automatic), libpopt0:amd64 (1.19+dfsg-1, automatic), liblockfile-bin:amd64 (1.17-1+b1, automatic), logrotate:amd64 (3.21.0-1, automatic), exim4-config:amd64 (4.96-15+deb12u5, automatic), libfastjson4:amd64 (1.2304.0-1, automatic), psmisc:amd64 (23.6-1, automatic), exim4-base:amd64 (4.96-15+deb12u5, automatic), librelp0:amd64 (1.11.0-1, automatic), rsyslog:amd64 (8.2302.0-1, automatic), libevent-2.1-7:amd64 (2.1.12-stable-8, automatic), libunbound8:amd64 (1.17.1-2+deb12u2, automatic), liblognorm5:amd64 (2.0.6-4, automatic), libestr0:amd64 (0.1.11-1, automatic), cron-daemon-common:amd64 (3.0pl1-162, automatic), exim4-daemon-light:amd64 (4.96-15+deb12u5, automatic), bsd-mailx:amd64 (8.1.2-0.20220412cvs-1, automatic), cron:amd64 (3.0pl1-162, automatic), rsyslog-relp:amd64 (8.2302.0-1), liblockfile1:amd64 (1.17-1+b1, automatic), libgnutls-dane0:amd64 (3.7.9-2+deb12u3, automatic)

However, the configure-rsyslog.tpl.sh was still detecting it as not installed for a very long time (more than 10 minutes)

Nov 07 21:32:30 machine-shoot--local--e2e-rslog-fd-local-64477-sjbq7 configure-rsyslog.sh[23550]: auditd.service is not installed, skipping configuration
Nov 07 21:32:30 machine-shoot--local--e2e-rslog-fd-local-64477-sjbq7 configure-rsyslog.sh[23550]: rsyslog.service and syslog.service are not installed, skipping configuration

Anything else we need to know:
N/A