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[CLI][Multi ASIC] Allow commands that don't support "-n" option to be run with "sudo ip netns.." option.#5446

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smaheshm merged 1 commit intosonic-net:masterfrom
smaheshm:ipnetns
Sep 24, 2020
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[CLI][Multi ASIC] Allow commands that don't support "-n" option to be run with "sudo ip netns.." option.#5446
smaheshm merged 1 commit intosonic-net:masterfrom
smaheshm:ipnetns

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@smaheshm smaheshm commented Sep 23, 2020 •
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- Why I did it

In multi ASIC platforms, CLIs commands can be under a namespace using the following command, which is now broken.

sudo ip netns exec asic0 show ....

NOTE: CLI commands that support "-n" option will still give an error when run with "sudo ip netns exec ... " option. This behavior is intended to encourage users to use "-n" option.

The preferred way of running a CLI command for a namespace is using "-n" option of the CLI command. At this point not all 'show' CLIs have the support of specifying "-n" option. "sudo ip netns exec asicX" is the only way run a command for a namespace.

- How I did it

The command was failing as it was trying to connect to DB in different namespace. Made change so that get namespace API returns the current namespace if it is run under a non default namespace.

- How to verify it

Verified manually on multi ASIC platform.

Before:

admin@str-n3164-acs-2:~$ sudo ip netns exec asic1 show --help
Traceback (most recent call last):       
  File "/usr/bin/show", line 8, in <module>    
    from show.main import cli                           
  File "/usr/lib/python2.7/dist-packages/show/main.py", line 233, in <module>
    iface_alias_converter = InterfaceAliasConverter()        
  File "/usr/lib/python2.7/dist-packages/show/main.py", line 58, in __init__
    self.port_dict = multi_asic.get_port_table()                   
  File "/usr/local/lib/python2.7/dist-packages/sonic_py_common/multi_asic.py", line 236, in get_port_table
.
.
  File "/usr/local/lib/python2.7/dist-packages/redis/connection.py", line 610, in send_command
    self.send_packed_command(self.pack_command(*args))
  File "/usr/local/lib/python2.7/dist-packages/redis/connection.py", line 585, in send_packed_command
    self.connect()                    
  File "/usr/local/lib/python2.7/dist-packages/redis/connection.py", line 489, in connect
    raise ConnectionError(self._error_message(e))
redis.exceptions.ConnectionError: Error 113 connecting to 240.127.1.2:6379. No route to host.

After:

admin@str-n3164-acs-2:~$ sudo ip netns exec asic0 show --help
Usage: show [OPTIONS] COMMAND [ARGS]...

  SONiC command line - 'show' command

Options:
  -?, -h, --help  Show this message and exit.

Commands:
  aaa                   Show AAA configuration
  acl                   Show ACL related information
  arp                   Show IP ARP table
  boot                  Show boot configuration

.
.

admin@str-n3164-acs-2:/etc/sonic$ sudo ip netns exec asic0 show priority-group  watermark shared                                                                                      
Ingress shared pool occupancy per PG:                                                                                                                                                 
         Port    PG0    PG1    PG2    PG3    PG4    PG5    PG6    PG7                                                                                                                 
-------------  -----  -----  -----  -----  -----  -----  -----  -----                                                                                                                 
    Ethernet0    416      0      0      0      0      0      0      0                                                                                                                 
    Ethernet4   1664      0      0      0      0      0      0      0                                                                                                                 
    Ethernet8      0      0      0      0      0      0      0      0                                                                                                                 
   Ethernet12      0      0      0      0      0      0      0      0                                                                                                                 
   Ethernet16   1664      0      0      0      0      0      0      0                                                                                                                 
   Ethernet20    416      0      0      0      0      0      0      0                                                                                                                 
   Ethernet24      0      0      0      0      0      0      0      0      
.
.
.                                                                                                           
Ethernet-BP44    416      0      0      0      0      0      0      0                                                                                                                 
Ethernet-BP48   9360      0      0      0      0      0      0      0                                                                                                                 
Ethernet-BP52    416      0      0      0      0      0      0      0                                                                                                                 
Ethernet-BP56    416      0      0      0      0      0      0      0                                                                                                                 
Ethernet-BP60    416      0      0      0      0      0      0      0

- Which release branch to backport (provide reason below if selected)

  • 201811
  • 201911
  • 202006

- Description for the changelog

Update get_all_linux_namespaces() API to return the current namespace

- A picture of a cute animal (not mandatory but encouraged)

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smaheshm commented Sep 23, 2020

NOTE: CLI commands that support "-n" option will still give an error when run with "sudo ip netns exec ... " option. This behavior is intended to encourage users to use "-n" option.

@smaheshm smaheshm requested review from abdosi and arlakshm September 23, 2020 18:27
@smaheshm smaheshm changed the title update get_all_namespace to return current namespace [CLI][Multi ASIC] Allow commands that don't support "-n" option to be run with "sudo ip netns.." option. Sep 23, 2020
@rlhui
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rlhui commented Sep 23, 2020 •
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Dont' see "Which release branch to backport (provide reason below if selected)" marked? Is this PR needed for backporting to 201911?

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smaheshm commented Sep 23, 2020

Dont' see "Which release branch to backport (provide reason below if selected)" marked? Is this PR needed for backporting to 201911?

I selected and saved, not sure why it didn't save.

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smaheshm commented Sep 24, 2020

retest vsimage please

arlakshm
arlakshm reviewed Sep 24, 2020
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lgtm

@smaheshm smaheshm merged commit 224cc39 into sonic-net:master Sep 24, 2020
abdosi pushed a commit that referenced this pull request Sep 28, 2020
@smaheshm @abdosi
[CLI][Multi ASIC] update get_all_namespace to return current namespace (
05b2a96 
#5446)
@abdosi abdosi mentioned this pull request Sep 29, 2020
Merged
@smaheshm smaheshm deleted the ipnetns branch December 15, 2020 22:29
santhosh-kt pushed a commit to santhosh-kt/sonic-buildimage that referenced this pull request Feb 25, 2021
@smaheshm @santhosh-kt
[CLI][Multi ASIC] update get_all_namespace to return current namespace (
fdbb980 
sonic-net#5446)
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@abdosi abdosi abdosi approved these changes

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