OK. I got this working. The right format is:
extend -cacheTime 2 myextend /bin/bash /path/to/my-script [parms-to-script]
Note that this code is added in version net-snmp 5.8. So this feature does not
work in lower version.
Thanks.
From: Gao, Jiafu (RIS-BCT)
Sent: Friday, July 12, 2019 9:17 AM
To: 'net-snmp-users@lists.sourceforge.net'
<net-snmp-users@lists.sourceforge.net>
Subject: Re: Customize SNMP Extension CacheTime
I see the following code in 5.8 (extend.c):
void
extend_parse_config(const char *token, char *cptr)
{
…
cptr = copy_nword(cptr, exec_name, sizeof(exec_name));
if (strcmp(exec_name, "-cacheTime") == 0) {
char cache_timeout_str[32];
The question is how -cacheTime s set? I assume it is in extend line the
snmpd.conf. I tried several formats, none of them work:
extend myextend -cacheTime 2 /bin/bash /path/to/my-script parm1-to-script
extend myextend /bin/bash -cacheTime 2 /path/to/my-script parm1-to-script
extend myextend /bin/bash /path/to/my-script -cacheTime 2 parm1-to-script
Anyone knows the right format to define extend with –cacheTime option?
Thanks,
Jeff
From: Gao, Jiafu (RIS-BCT) via Net-snmp-users
[mailto:net-snmp-users@lists.sourceforge.net]
Sent: Thursday, July 11, 2019 4:53 PM
To:
net-snmp-users@lists.sourceforge.net<mailto:net-snmp-users@lists.sourceforge.net>
Subject: Customize SNMP Extension CacheTime
*** External email: use caution ***
________________________________
Hi,
I am using SNMP extension to help load balance my servers, and need to
customize cache time. The default cache time for extension is 5 seconds. I
need to change it to lower or higher for business purpose. However, the value
seems to be read-only:
snmpset -v2c –c<com> localhost
'NET-SNMP-ENTEND-MIB::nsExtendCacheTime."my-ext"' integer 2
Error in packet.
Reason: noAccess
Failed object: NET-SNMP-EXTEND-MIB::nsExtendCacheTime."my-ext"
Is there a way to change the nsExtendCacheTime with writing an
subagent/AgentX/extension module? It introduces lots of overhead of coding,
deployment, and maintenance.
Thanks!
Jeff
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