** Changed in: linux (Ubuntu Hirsute)
Status: New => Fix Committed
** Description changed:
+ SRU Justification:
+
+ [Impact]
+
+ * Nice to have feature requested by IBM - a systemd service monitoring
+ KVM guests.
+ * Adds a new systemd service, not enabled by default.
+
+ [Fix]
+
+ * Install the systemd .service file when installing linux-tools-host
+
+ [Test Plan]
+
+ * dpkg -c linux-tools-host_5.11.0-18.19_all.deb
+ ./lib/systemd/system/kvm_stat.service
+ * Install the package and reboot
+ * Check if kvm_stat is present and not active after reboot:
+ ls -l /lib/systemd/system/kvm_stat.service
+ systemctl -a | grep kvm_stat
+
+ [Where problems could occur]
+
+ * Service can be enabled and started by mistake or by any further future
+ Makefile change (enabling all services installed by linux-tools-host).
+
+ * The service logs into /var/log/kvm_stat.csv (not journal!) and package does
+ not provide logrotate by default, thus the logging could eat entire
+ disk space.
+
+ -- Original Description --
+
Description: tools/kvm_stat: Add restart delay
Symptom: If the kvm service is enabled and the system rebooted,
- Systemd's initial attempt to start the kvm unit file may
- fail in case the kvm module is not loaded. However, once the
- kvm module is loaded, the service is _not_ started.
+ Systemd's initial attempt to start the kvm unit file may
+ fail in case the kvm module is not loaded. However, once the
+ kvm module is loaded, the service is _not_ started.
Problem: Since the unit file does not specify a delay for the retries,
- Systemd restarts with a minimum delay a number of times
- before giving up and disabling the service. Which means a
- subsequent kvm module load will have kvm running without
- monitoring.
+ Systemd restarts with a minimum delay a number of times
+ before giving up and disabling the service. Which means a
+ subsequent kvm module load will have kvm running without
+ monitoring.
Solution: Add an appropriate delay in the unit file.
Reproduction: (1) Enable the kvm service via systemctl
- (2) Reboot
- (3) Verify that the kvm module is not loaded & kvm service
- not running
- (4) Load the kvm module via 'modprobe kvm'
- (5) Verify that the kvm service came up within the next
- minute.
+ (2) Reboot
+ (3) Verify that the kvm module is not loaded & kvm service
+ not running
+ (4) Load the kvm module via 'modprobe kvm'
+ (5) Verify that the kvm service came up within the next
+ minute.
Preventive: yes
Just use the attached patch and you're good!
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https://bugs.launchpad.net/bugs/1921870
Title:
[UBUNTU 21.04] tools/kvm_stat: Add restart delay
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