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:[email protected]]
Sent: Thursday, July 11, 2019 4:53 PM
To: [email protected]
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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