Fix in Monit memory_checker plugin. Skip fetching running containers if docker engine is down (can happen in deinit).
This PR fixes issue #11472.
Signed-off-by: liora liora@nvidia.com
Why I did it
In the case where Monit runs during deinit flow, memory_checker plugin is fetching the running containers without checking if Docker service is still running. I added this check.
How I did it
Use systemctl is-active to check if Docker engine is still running.
How to verify it
Use systemctl to stop docker engine and reload Monit, no errors in log and relevant print appears in log.
Which release branch to backport (provide reason below if selected)
The fix is required in 202205 and 202012 since the PR that introduced the issue was cherry picked to those branches (#11129).
Signed-off-by: Yong Zhao yozhao@microsoft.com
Why I did it
This PR aims to fix an issue (#10088) by enhancing the script memory_checker.
Specifically, if container is not created successfully during device is booted/rebooted, then memory_checker do not need check its memory usage.
How I did it
In the script memory_checker, a function is added to get names of running containers. If the specified container name is not in current running container list, then this script will exit without checking its memory usage.
How to verify it
I tested on a lab device by following the steps:
Stops telemetry container with command sudo systemctl stop telemetry.service
Removes telemetry container with command docker rm telemetry
Checks whether the script memory_checker ran by Monit will generate the syslog message saying it will exit without checking memory usage of telemetry.
Signed-off-by: Yong Zhao <yozhao@microsoft.com>
Why I did it
This PR aims to fix the Monit issue which shows Monit can't reset its counter when monitoring memory usage of telemetry container.
Specifically the Monit configuration file related to monitoring memory usage of telemetry container is as following:
check program container_memory_telemetry with path "/usr/bin/memory_checker telemetry 419430400"
if status == 3 for 10 times within 20 cycles then exec "/usr/bin/restart_service telemetry"
If memory usage of telemetry container is larger than 400MB for 10 times within 20 cycles (minutes), then it will be restarted.
Recently we observed, after telemetry container was restarted, its memory usage continuously increased from 400MB to 11GB within 1 hour, but it was not restarted anymore during this 1 hour sliding window.
The reason is Monit can't reset its counter to count again and Monit can reset its counter if and only if the status of monitored service was changed from Status failed to Status ok. However, during this 1 hour sliding window, the status of monitored service was not changed from Status failed to Status ok.
Currently for each service monitored by Monit, there will be an entry showing the monitoring status, monitoring mode etc. For example, the following output from command sudo monit status shows the status of monitored service to monitor memory usage of telemetry:
Program 'container_memory_telemetry'
status Status ok
monitoring status Monitored
monitoring mode active
on reboot start
last exit value 0
last output -
data collected Sat, 19 Mar 2022 19:56:26
Every 1 minute, Monit will run the script to check the memory usage of telemetry and update the counter if memory usage is larger than 400MB. If Monit checked the counter and found memory usage of telemetry is larger than 400MB for 10 times
within 20 minutes, then telemetry container was restarted. Following is an example status of monitored service:
Program 'container_memory_telemetry'
status Status failed
monitoring status Monitored
monitoring mode active
on reboot start
last exit value 0
last output -
data collected Tue, 01 Feb 2022 22:52:55
After telemetry container was restarted. we found memory usage of telemetry increased rapidly from around 100MB to more than 400MB during 1 minute and status of monitored service did not have a chance to be changed from Status failed to Status ok.
How I did it
In order to provide a workaround for this issue, Monit recently introduced another syntax format repeat every <n> cycles related to exec. This new syntax format will enable Monit repeat executing the background script if the error persists for a given number of cycles.
How to verify it
I verified this change on lab device str-s6000-acs-12. Another pytest PR (Azure/sonic-mgmt#5492) is submitted in sonic-mgmt repo for review.
* Update container_checker for multi-asic devices
Update container_checker for multi-asic devices to add database containers in always_running_containers.
Previous change was made for single-asic, and that database containers were not considered as feature when writing to state_db.
* Update container_checker
Update an indent
*To run VNET route consistency check periodically.
*For any failure, the monit will raise alert based on return code.
Signed-off-by: Volodymyr Samotiy <volodymyrs@nvidia.com>
Signed-off-by: Yong Zhao yozhao@microsoft.com
Why I did it
Currently we leveraged the Supervisor to monitor the running status of critical processes in each container and it is more reliable and flexible than doing the monitoring by Monit. So we removed the functionality of monitoring the critical processes by Monit.
How I did it
I removed the script process_checker and corresponding Monit configuration entries of critical processes.
How to verify it
I verified this on the device str-7260cx3-acs-1.
Signed-off-by: Yong Zhao yozhao@microsoft.com
Why I did it
This PR aims to monitor the memory usage of streaming telemetry container and restart streaming telemetry container if memory usage is larger than the pre-defined threshold.
How I did it
I borrowed the system tool Monit to run a script memory_checker which will periodically check the memory usage of streaming telemetry container. If the memory usage of telemetry container is larger than the pre-defined threshold for 10 times during 20 cycles, then an alerting message will be written into syslog and at the same time Monit will run the script restart_service to restart the streaming telemetry container.
How to verify it
I verified this implementation on device str-7260cx3-acs-1.
Why I did it
Finding running containers through "docker ps" breaks when kubernetes deploys container, as the names are mangled.
How I did it
The data is is available from FEATURE table, which takes care of kubernetes deployment too.
How to verify it
Deploy a feature via kubernetes and don't expect error from container_check.
Signed-off-by: Yong Zhao yozhao@microsoft.com
Why I did it
Since we introduced a new value always_disabled for the state field in FEATURE table, the expected running container list
should exclude the always_diabled containers. This bug was found by nightly test and posted at here: issue. This PR fixes#7210.
How I did it
I added a logic condition to decide whether the value of state field of a container was always_disabled or not.
How to verify it
I verified this on the device str-dx010-acs-1.
Which release branch to backport (provide reason below if selected)
201811
201911
202006
[ x] 202012
**- Why I did it**
This PR aims to monitor the running status of each container. Currently the auto-restart feature was enabled. If a critical process exited unexpected, the container will be restarted. If the container was restarted 3 times during 20 minutes, then it will not run anymore unless we cleared the flag using the command `sudo systemctl reset-failed <container_name>` manually.
**- How I did it**
We will employ Monit to monitor a script. This script will generate the expected running container list and compare it with the current running containers. If there are containers which were expected to run but were not running, then an alerting message will be written into syslog.
**- How to verify it**
I tested this feature on a lab device `str-a7050-acs-3` which has single ASIC and `str2-n3164-acs-3` which has a Multi-ASIC. First I manually stopped a container by running the command `sudo systemctl stop <container_name>`, then I checked whether there was an alerting message in the syslog.
Signed-off-by: Yong Zhao <yozhao@microsoft.com>
Why/How I did:
Make sure first error syslog is triggered based on FAULT TOLERANCE condition.
Added support of repeat clause with alert action. This is used as trigger
for generation of periodic syslog error messages if error is persistent
Updated the monit conf files with repeat every x cycles for the alert action
The psutil library used in process_checker create a cache for each
process when calling process_iter. So, there is some possibility that
one process exists when calling process_iter, but not exists when
calling cmdline, which will raise a NoSuchProcess exception. This commit
fix the issue.
Signed-off-by: bingwang <bingwang@microsoft.com>
We want to let Monit to unmonitor the processes in containers which are disabled in `FEATURE` table such that
Monit will not generate false alerting messages into the syslog.
Signed-off-by: Yong Zhao <yozhao@microsoft.com>
We are moving toward building all Python packages for SONiC as wheel packages rather than Debian packages. This will also allow us to more easily transition to Python 3.
Python files are now packaged in "sonic-utilities" Pyhton wheel. Data files are now packaged in "sonic-utilities-data" Debian package.
**- How I did it**
- Build and install sonic-utilities as a Python package
- Remove explicit installation of wheel dependencies, as these will now get installed implicitly by pip when installing sonic-utilities as a wheel
- Build and install new sonic-utilities-data package to install data files required by sonic-utilities applications
- Update all references to sonic-utilities scripts/entrypoints to either reference the new /usr/local/bin/ location or remove absolute path entirely where applicable
Submodule updates:
* src/sonic-utilities aa27dd9...2244d7b (5):
> Support building sonic-utilities as a Python wheel package instead of a Debian package (#1122)
> [consutil] Display remote device name in show command (#1120)
> [vrf] fix check state_db error when vrf moving (#1119)
> [consutil] Fix issue where the ConfigDBConnector's reference is missing (#1117)
> Update to make config load/reload backward compatible. (#1115)
* src/sonic-ztp dd025bc...911d622 (1):
> Update paths to reflect new sonic-utilities install location, /usr/local/bin/ (#19)
* [Monit] Change the monitoring period of monit from 120 seconds to 60
seconds and also at the same time double the interval for existing sonic monit config file in
host.
Signed-off-by: Yong Zhao <yozhao@microsoft.com>
- monit config broke by one monit upgrade
- abandon sed approach since it is suspestible to monit config changes
- use unixsocket instead of httpd due to a bug in 5.20.0
