Xenial as-is
You can see on the +100000 UID the container is the first line:
$ ps axlf | grep snmpd | grep -v grep
5 100112 4553  2723  20   0  55228  5952 -      S    ?          0:00      \_ 
/usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -g snmp -I -smux mteTrigger 
mteTriggerConf -p /run/snmpd.pid
5   112  3398     1  20   0  63340  7672 -      S    ?          0:00 
/usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -g snmp -I -smux mteTrigger 
mteTriggerConf -p /run/snmpd.pid

$ sudo systemctl restart snmpd
$ ps axlf | grep snmpd | grep -v grep
5   112  4656     1  20   0  63344  7820 -      S    ?          0:00 
/usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -g snmp -I -smux mteTrigger 
mteTriggerConf -p /run/snmpd.pid

Containers view:
Feb 21 16:06:35 x1 systemd[1]: Started LSB: SNMP agents.
Feb 21 16:06:35 x1 snmpd[1208]: NET-SNMP version 5.7.3
Feb 21 16:08:03 x1 snmpd[1208]: Received TERM or STOP signal...  shutting 
down...


Upgrade to snmpd from proposed:
$ sudo apt install snmpd
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  libsnmp30
Suggested packages:
  snmptrapd
The following packages will be upgraded:
  libsnmp30 snmpd
2 upgraded, 0 newly installed, 0 to remove and 39 not upgraded.
Need to get 868 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 snmpd amd64 
5.7.3+dfsg-1ubuntu4.1 [57,2 kB]
Get:2 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 libsnmp30 
amd64 5.7.3+dfsg-1ubuntu4.1 [811 kB]
Fetched 868 kB in 0s (2.779 kB/s)
Preconfiguring packages ...
(Reading database ... 54148 files and directories currently installed.)
Preparing to unpack .../snmpd_5.7.3+dfsg-1ubuntu4.1_amd64.deb ...
Unpacking snmpd (5.7.3+dfsg-1ubuntu4.1) over (5.7.3+dfsg-1ubuntu4) ...
Preparing to unpack .../libsnmp30_5.7.3+dfsg-1ubuntu4.1_amd64.deb ...
Unpacking libsnmp30:amd64 (5.7.3+dfsg-1ubuntu4.1) over (5.7.3+dfsg-1ubuntu4) ...
Processing triggers for systemd (229-4ubuntu21.1) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for libc-bin (2.23-0ubuntu10) ...
Setting up libsnmp30:amd64 (5.7.3+dfsg-1ubuntu4.1) ...
Setting up snmpd (5.7.3+dfsg-1ubuntu4.1) ...



$ ps axlf | grep snmpd | grep -v grep
5 100112 5601  2723  20   0  55228  5668 -      S    ?          0:00      \_ 
/usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -g snmp -I -smux mteTrigger 
mteTriggerConf -p /run/snmpd.pid
5   112  5573     1  20   0  63344  7684 -      S    ?          0:00 
/usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -g snmp -I -smux mteTrigger 
mteTriggerConf -p /run/snmpd.pid

Host:
$ sudo systemctl restart snmpd
Container still:
Active: active (running) since Wed 2018-02-21 16:10:39 UTC; 1min 3s ago

$ ps axlf | grep snmpd | grep -v grep
5 100112 5601  2723  20   0  55228  5668 -      S    ?          0:00      \_ 
/usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -g snmp -I -smux mteTrigger 
mteTriggerConf -p /run/snmpd.pid
5   112  5660     1  20   0  63340  7656 -      S    ?          0:00 
/usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -g snmp -I -smux mteTrigger 
mteTriggerConf -p /run/snmpd.pid

The pid on host changed, the container one stayed as-is.

** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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https://bugs.launchpad.net/bugs/1720109

Title:
  snmpd stop on host stops snmpd on LXD containers

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