Frequently asked questions ...

and other observations made during the use of the emulator.

Error 'too many open files' during large experiments

Solution is to increase the ulimit -n (maximum number of open files) on the machine. Unfortunately, was not able to do this for a normal user on a Ubuntu 18.04. Only for the root user.

# switch to root
sudo su

# change sys. limit
vim /etc/sysctl.conf 
# add
fs.file-max = 2097152
# change limit for root user
ulimit -Sn 500000
ulimit -Hn 500000
# check
ulimit -a
# run your experiment using root

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FAQ for OSM integration

ERROR Waiting for management IP address reported by the VIM.

During instantiation:

ERROR Waiting for management IP address reported by the VIM. Updating VNFRs: ns_update_vnfr: Not fou
nd member_vnf_index=2 vdur=vdu01 interface=v2-out at RO info

Solution: This error points to unused connection points defined in VNFDs but not used in the NSD! see: https://github.com/containernet/vim-emu/issues/297