**- Why I did it**
When I tested auto-restart feature of swss container by manually killing one of critical processes in it, swss will be stopped. Then syncd container as the peer container should also be
stopped as expected. However, I found sometimes syncd container can be stopped, sometimes
it can not be stopped. The reason why syncd container can not be stopped is the process
(/usr/local/bin/syncd.sh stop) to execute the stop() function will be stuck between the lines 164 –167. Systemd will wait for 90 seconds and then kill this process.
164 # wait until syncd quit gracefully
165 while docker top syncd$DEV | grep -q /usr/bin/syncd; do
166 sleep 0.1
167 done
The first thing I did is to profile how long this while loop will spin if syncd container can be
normally stopped after swss container is stopped. The result is 5 seconds or 6 seconds. If syncd
container can be normally stopped, two messages will be written into syslog:
str-a7050-acs-3 NOTICE syncd#dsserve: child /usr/bin/syncd exited status: 134
str-a7050-acs-3 INFO syncd#supervisord: syncd [5] child /usr/bin/syncd exited status: 134
The second thing I did was to add a timer in the condition of while loop to ensure this while loop will be forced to exit after 20 seconds:
After that, the testing result is that syncd container can be normally stopped if swss is stopped
first. One more thing I want to mention is that if syncd container is stopped during 5 seconds or 6 seconds, then the two log messages can be still seen in syslog. However, if the execution
time of while loop is longer than 20 seconds and is forced to exit, although syncd container can be stopped, I did not see these two messages in syslog. Further, although I observed the auto-restart feature of swss container can work correctly right now, I can not make sure the issue which syncd container can not stopped will occur in future.
**- How I did it**
I added a timer around the while loop in stop() function. This while loop will exit after spinning
20 seconds.
Signed-off-by: Yong Zhao <yozhao@microsoft.com>
* Multi DB with namespace support, Introducing the database_global.json file
for supporting accessing DB's in other namespaces for service running in
linux host
* Updates based on comments
* Adding the j2 templates for database_config and database_global files.
* Updating to retrieve the redis DIR's to be mounted from database_global.json file.
* Additional check to see if asic.conf file exists before sourcing it.
* Updates based on PR comments discussion.
* Review comments update
* Updates to the argument "-n" for namespace used in both context of parsing minigraph and multi DB access.
* Update with the attribute "persistence_for_warm_boot" that was added to database_config.json file earlier.
* Removing the database_config.json file to avioid confusion in future.
We use the database_config.json.j2 file to generate database_config.json files dynamically.
* Update the comments for sudo usage in docker_image_ctrl.j2
* Update with the new logic in PING PONG tests using sonic-db-cli. With this we wait till the
PONG response is received when redis server is up.
* Similar changes in swss and syncd scripts for the PING tests with sonic-db-cli
* Updated with a missing , in the database_config.json.j2 file, Do pip install of j2cli in docker-base-buster.
* [MultiDB] (except ./src and ./dockers dirs): replace redis-cli with sonic-db-cli and use new DBConnector
* update comment for a potential bug
* update comment
* add TODO maker as review reqirement
ASIC reset events are captured by hw-mgmt and hw-mgmt calls chipup/chipdown internally without OS iteraction
Signed-off-by: Stepan Blyschak <stepanb@mellanox.com>
Put a flag for fast-reboot to the db using EXPIRE feature. Using this flag in other part of SONiC to start in Fast-reboot mode. If we reload a config, the state in the db will be removed.
Issue Overview
shutdown flow
For any shutdown flow, which means all dockers are stopped in order, pmon docker stops after syncd docker has stopped, causing pmon docker fail to release sx_core resources and leaving sx_core in a bad state. The related logs are like the following:
INFO syncd.sh[23597]: modprobe: FATAL: Module sx_core is in use.
INFO syncd.sh[23597]: Unloading sx_core[FAILED]
INFO syncd.sh[23597]: rmmod: ERROR: Module sx_core is in use
config reload & service swss.restart
In the flows like "config reload" and "service swss restart", the failure cause further consequences:
sx_core initialization error with error message like "sx_core: create EMAD sdq 0 failed. err: -16"
syncd fails to execute the create switch api with error message "syncd_main: Runtime error: :- processEvent: failed to execute api: create, key: SAI_OBJECT_TYPE_SWITCH:oid:0x21000000000000, status: SAI_STATUS_FAILURE"
swss fails to call SAI API "SAI_SWITCH_ATTR_INIT_SWITCH", which causes orchagent to restart. This will introduce an extra 1 or 2 minutes for the system to be available, failing related test cases.
reboot, warm-reboot & fast-reboot
In the reboot flows including "reboot", "fast-reboot" and "warm-reboot" this failure doesn't have further negative effects since the system has already rebooted. In addition, "warm-reboot" requires the system to be shutdown as soon as possible to meet the GR time restriction of both BGP and LACP. "fast-reboot" also requires to meet the GR time restriction of BGP which is longer than LACP. In this sense, any unnecessary steps should be avoided. It's better to keep those flows untouched.
summary
To summarize, we have to come up with a way to ensure:
shutdown pmon docker ahead of syncd for "config reload" or "service swss restart" flow;
don't shutdown pmon docker ahead of syncd for "fast-reboot" or "warm-reboot" flow in order to save time.
for "reboot" flow, either order is acceptable.
Solution
To solve the issue, pmon shoud be stopped ahead of syncd stopped for all flows except for the warm-reboot.
- How I did it
To stop pmon ahead of syncd stopped. This is done in /usr/local/bin/syncd.sh::stop() and for all shutdown sequence.
Now pmon stops ahead of syncd so there must be a way in which pmon can start after syncd started. Another point that should be taken consideration is that pmon starting should be deferred so that services which have the logic of graceful restart in fast-reboot and warm-reboot have sufficient CPU cycles to meet their deadline.
This is done by add "syncd.service" as "After" to pmon.service and startin /usr/local/bin/syncd.sh::wait()
To start pmon automatically after syncd started.
* fix fast reboot compatibility
We should handle both cases for backward-compatible with 201803:
- fast-reboot
- SONIC_BOOT_TYPE=fast-reboot
* handle review comments
* add a comment that getBootType code snippet is shared between two files
* [services] Ensure swss and syncd services start before dependent services
* Add 'attach' functions to scripts which get installed to /usr/local/bin so that services only reference the one script each
* Add 'After=swss.service' to syncd.service
need to flush asic db in swss.sh instead of syncd.sh
orchagent might already started in swss.sh and put commands
into asic db before asic db is flushed in syncd.sh. This
causes race condition such as INIT_VIEW not passing to syncd.
Signed-off-by: Guohan Lu <gulv@microsoft.com>
* Perform stop/start of Mellanox driver tools for all types of reboot
* Don't set Mellanox FAST_BOOT option for "cold" reboot
* Don't send "syncd_request_shutdown" event for "cold" reboot on Mellanox platforms
Signed-off-by: Volodymyr Samotiy <volodymyrs@mellanox.com>
- cold shutdown is used by regular service stop and/or fast reboot
- warm shutdown is used by warm restart and/or warm reboot
Signed-off-by: Ying Xie <ying.xie@microsoft.com>
Update the hw-mgmt to latest release V.2.0.0060.
Update the related files according to the latest hw-mgmt.
Signed-off-by: Kevin Wang <kevinw@mellanox.com>
* [syncd] warn shutdown syncd process when warm boot is enabled
Signed-off-by: Ying Xie <ying.xie@microsoft.com>
* [warmboot] mount folder to hold warmboot temporary files
Signed-off-by: Ying Xie <ying.xie@microsoft.com>
* Fix a typo
* [swss.sh] refactor ssh service script code
- Move checks and waits to helper functions.
- Remove early returns from code stream
Signed-off-by: Ying Xie <ying.xie@microsoft.com>
* [swss.sh] Add debug log for service state changes
Signed-off-by: Ying Xie <ying.xie@microsoft.com>
* [syncd] Separate out syncd service from swss service
Still make them start/stop/restart synchronously so existing scripts
continue working.
Signed-off-by: Ying Xie <ying.xie@microsoft.com>
* Remove extra 'After' in swss service and remove syncd docker warm boot code
Syncd warm boot needs more thinking, we can put it back once the work
flow has been defined and ready for coding/testing.
* [syncd] syncd start/stop/restart shouldn't affect swss state
Semi-detach syncd service state change from swss:
- swss state change still chase syncd service to follow except warm boot
- syncd state change will only affect itself.
Signed-off-by: Ying Xie <ying.xie@microsoft.com>
* add missing '{'
