Why I did it
On a supervisor card in a chassis, syncd/teamd/swss/lldp etc dockers are created for each Switch Fabric card. However, not all chassis would have all the switch fabric cards present. In this case, only dockers for Switch Fabrics present would be created.
The monit 'container_checker' fails in this scenario as it is expecting dockers for all Switch Fabrics (based on NUM_ASIC defined in asic.conf file).
#### Why I did it
This function is critical for is_multi_asic() and SonicDBConfig initializing. No explicit reading ConfigDB. Otherwise it will implicitly trigger SonicDBConfig initializing.
#### How I did it
1. No explicit reading ConfigDB in get_asic_conf_file_path()
2. Collect asic_conf_path_candidates lazily to prevent any unnecessary side effect and improve the performance
On a multi-asic Supervisor card, running commands like
'show interface counter' opens a confid_db connection per
namespace per interface which results in many duplicate connections
exceeding the allowed open file handles. This causes the command to fail.
Caching the connections to prevent duplicate handles.
* [multi-asic][cli][chassis-db] Avoiding connecting to chassis db
Currently, for all the cli commands, we connect to all databases
mentioned in the database_config.json. The database_config.json also
includes the databases from chassis redis server from supervisor card.
It is unneccessary to connect to databases from chassis redis server
when cli commands are executed form linecard. But we need to allow
connection to chassis databases when the cli commands are executed from
supervisor card.
The changes in this PR fixes this problem. This PR requires that
asic.conf in supervisor card includes VOQ_SUPERVISOR with value 1 to
indentify the supervisor card. The connect_to_all_dbs_for_ns() is
changed to skip chassis databases form the list of collected databases
if the card is not supervisor card.
#### Why I did it
Remove the call to `SonicDBConfig.load_sonic_global_db_config()` in the multi asic functions.
The expection is the client calling this function will call `SonicDBConfig.load_sonic_global_db_config()`
This PR is dependent on the PR https://github.com/Azure/sonic-utilities/pull/1712
#### How to verify it
compile sonic-utilities
The behavior of `subprocess.Popen()` changed in Python 3 such that stdin, stdout and stderr are treated as bytes by default. Adding the `universal_newlines=True` argument changes this behavior to return strings, matching the behavior of Python 2. The change is backward-compatible with Python 2, as well.
- Why I did it
Update the routine is_bgp_session_internal() by checking the BGP_INTERNAL_NEIGHBOR table.
Additionally to address the review comment #5520 (comment)
Add timer settings as will in the internal session templates and keep it minimal as these sessions which will always be up.
Updates to the internal tests data + add all of it to template tests.
- How I did it
Updated the APIs and the template files.
- How to verify it
Verified the internal BGP sessions are displayed correctly with show commands with this API is_bgp_session_internal()
Added new MultiASIC util method "get_back_end_interface_set()" to speed up back-end interface check by allowing caller to cache the back-end intf into a set. This way the caller can use this set for all subsequent back-end interface check requests instead of each time need to read from redis DB which become a scaling issue for cases such as checking for thousands of nexthop routes for filtering purpose.
Signed-off-by: Arvindsrinivasan Lakshmi Narasimhan arlakshm@microsoft.com
The following common APIs are added for multi ASIC
- an API to check if a given port is a internal or external port
- an API to check if a given port-channel is internal or external
- an API to check if a bgp-session is internal or external
- an API to connect to the config and other dbs in the a given namespace
- added common APIs to the sonic_py_common library.
- update the sample port-config.ini with role column and add corresponding test to verify the ports configuration is - generated properly.
