I use Zabbix to monitor my environment. The Zabbix server warns me with the following message:
"Free disk space is less than 20% on volume Shared memory"
Can someone explain "volume Shared memory" in this context?
How should I address this issue?
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2 Answers
/dev/shm is a temporary filesystem mounted usually under /run/shm for IPC (inter process communication) which - in my opinion - should not be monitored in your case.
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When i run the command
df -hI get the following:none 2.0G 0 2.0G 0% /run/shm– vs06Dec 17, 2013 at 12:18 -
2G sounds to be not enough for general server usage. I have an Ubuntu 13.04 Server which has 20G by default. Does
ipcs -ashow any big shared memory allocation? Dec 17, 2013 at 14:13 -
No. The biggest have ~16Mb
ipcs -a ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x78000c05 65538 zabbix_user 600 16777216 33– vs06Dec 17, 2013 at 18:03 -
I'd check the installation requirements of the installed software. Does any of it mention required minimum shared memory? Does your configuration match the requirements? I'd enlist the installed software and calculate the minimum required shared memory from the documentations' data. If the requirements are higher than your configuration, raise it a little bit. Dec 17, 2013 at 18:19
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look like zabbix can detect these volumes in new kernels with snmpd, like in RHEL/Centos 7. for old systems it is not visible.– GioMacFeb 16, 2015 at 0:09
If you don't wish to monitor the Shared memoryon your system, you can easyly add it to the filter expression.
- For this go to "Administration"->"General"->"Regular expressions"
- Select the entry
Storage devices for SNMP discoveryentry - Add the
Shared memoryentry to the list
At the same time you could also remove the various /run/xxx filesystems from discovery.
My current expression is:
^(Physical memory|Virtual memory|Memory buffers|Cached memory|Swap space|Shared memory|/sys/fs/cgroup|/run/lock|/dev/shm|/run/user|/run/user/0|/run)$
