Debian Bug report logs - #815142
snmpd: dose not start snmpd when LXC containers (running snmpd process inside it) exists

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Genta IHA <genta@ate-mahoroba.jp>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: snmpd: dose not start snmpd when LXC containers (running snmpd process inside it) exists

Date: Fri, 19 Feb 2016 19:19:03 +0900

Package: snmpd
Version: 5.7.2.1+dfsg-1
Severity: normal
Tags: patch

Dear Maintainer,

We are managing a Debian box running some LXC containers.
These LXC containers have a running snmpd process.

These snmp process in LXC containers are visible from the host.
Example:

---- cut here ----
    lxc-host:~$ sudo lxc-ls --running
    debian8

    ('init' of the container "debian8" is running PID 27570)
    lxc-host:~$ sudo ps xa|grep ini[t]
        1 ?        Ss     0:04 /sbin/init
    27570 ?        Ss     0:03 init [3]

    (one snmpd process running in the LXC container (PPID: 27570))
    lxc-host:~$ sudo ps xaj|grep snmp[d]
    27570 28867 28865 28865 ?           -1 S      103   4:57 /usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -g snmp -I -smux mteTrigger mteTriggerConf -p /run/snmpd.pid
---- cut here ----

In such a situation, I've tried "service snmpd start" on the host,
but it doesen't work. Because the "start-stop-daemon" in the file
/etc/init.d/snmpd don't have "--pid-file" option, then it beleve that
snmpd already running. But the snmp process is LXC containers' one,
not for the host.

I attached a patch to fix this problem.

-- System Information:
Debian Release: 8.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/1 CPU core)
Locale: LANG=ja_JP.UTF-8, LC_CTYPE=ja_JP.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages snmpd depends on:
ii  adduser                3.113+nmu3
ii  debconf [debconf-2.0]  1.5.56
ii  libc6                  2.19-18+deb8u3
ii  libsnmp-base           5.7.2.1+dfsg-1
ii  libsnmp30              5.7.2.1+dfsg-1
ii  lsb-base               4.1+Debian13+nmu1

snmpd recommends no packages.

Versions of packages snmpd suggests:
pn  snmptrapd  <none>

-- debconf information excluded

--- snmpd.orig	2015-04-15 06:36:32.000000000 +0900
+++ snmpd	2016-02-19 16:06:35.746248954 +0900
@@ -45,21 +45,21 @@
 	    mkdir -p /var/run/agentx
     fi
     if [ "$SNMPDRUN" = "yes" -a -f /etc/snmp/snmpd.conf ]; then
-	start-stop-daemon --quiet --start --oknodo --exec /usr/sbin/snmpd \
+	start-stop-daemon --quiet --start --pidfile $SNMP_PID --oknodo --exec /usr/sbin/snmpd \
 	    -- $SNMPDOPTS
 	log_progress_msg " snmpd"
     fi
     ;;
   stop)
     log_daemon_msg "Stopping SNMP services:"
-    start-stop-daemon --quiet --stop --oknodo --retry 3 --exec /usr/sbin/snmpd && [ ! -f $SNMP_PID ] || rm $SNMP_PID
+    start-stop-daemon --quiet --stop --pidfile $SNMP_PID --oknodo --retry 3 --exec /usr/sbin/snmpd && [ ! -f $SNMP_PID ] || rm $SNMP_PID
     log_progress_msg " snmpd"
     ;;
   restart)
     log_daemon_msg "Restarting SNMP services:"
-    start-stop-daemon --quiet --stop --oknodo --retry 3 --exec /usr/sbin/snmpd  && [ ! -f $SNMP_PID ] || rm $SNMP_PID
+    start-stop-daemon --quiet --stop --pidfile $SNMP_PID --oknodo --retry 3 --exec /usr/sbin/snmpd  && [ ! -f $SNMP_PID ] || rm $SNMP_PID
     if [ "$SNMPDRUN" = "yes" -a -f /etc/snmp/snmpd.conf ]; then
-	start-stop-daemon --quiet --start --exec /usr/sbin/snmpd -- $SNMPDOPTS
+	start-stop-daemon --quiet --start --pidfile $SNMP_PID --exec /usr/sbin/snmpd -- $SNMPDOPTS
 	log_progress_msg " snmpd"
     fi
     ;;

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