OPMS there are multiple shm/overlay filesystem entries created - is the number configurable?
Article ID: 197790
Updated On:
Products
CA App Synthetic Monitor
DX Application Performance Management
Issue/Introduction
We have installed an OPMS on new server and have observed that there are multiple shm/overlay filesystem entries present in the df output
# df
Filesystem 1K-blocks Used Available Use% Mounted on
...
overlay 62903276 13439232 49464044 22% /var/lib/docker/overlay2/4c3c53 8099fd9c3dd4859bcc21b48a45882c06c43567cb84d2bd97ea7fd47e3e/merged
...
overlay 62903276 13439232 49464044 22% /var/lib/docker/overlay2/9d77fa 4c6075fb14526267c913766747d62f08bfc22e77684a2f171e80eb7a05/merged
shm 65536 0 65536 0% /var/lib/docker/containers/2cef 9a094655696cc2d43bffed578eb8cb32ffa61489aab278509822acfe43ca/mounts/shm
shm 65536 0 65536 0% /var/lib/docker/containers/cc8f b5a23936ae3aea0252cce92584bf306ebb38ef8f55bacaefb69b5defe538/mounts/shm
...
why are there so many and is the number configurable?
Environment
Release : 10.4
Component : App Synthetic Monitor OPMS
Resolution
The shm/overlay 'filesystems' are present due to the docker images that the OPMS starts. The number of instances of the docker images started (jmeter2, jmeter4, rbtm) is determined by the OPMS installer based on the number of CPU cores available and is designed to give an optimal performance. We therefore do not recommend changing the configured values.
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